diff --git a/src/AxiOmron.PcbCheck/Assets/AppIcon.ico b/src/AxiOmron.PcbCheck/Assets/AppIcon.ico
new file mode 100644
index 0000000..1d88bbf
Binary files /dev/null and b/src/AxiOmron.PcbCheck/Assets/AppIcon.ico differ
diff --git a/src/AxiOmron.PcbCheck/Assets/AppIcon.png b/src/AxiOmron.PcbCheck/Assets/AppIcon.png
new file mode 100644
index 0000000..cf2649b
Binary files /dev/null and b/src/AxiOmron.PcbCheck/Assets/AppIcon.png differ
diff --git a/src/AxiOmron.PcbCheck/AxiOmron.PcbCheck.csproj b/src/AxiOmron.PcbCheck/AxiOmron.PcbCheck.csproj
index 496e887..acccc63 100644
--- a/src/AxiOmron.PcbCheck/AxiOmron.PcbCheck.csproj
+++ b/src/AxiOmron.PcbCheck/AxiOmron.PcbCheck.csproj
@@ -5,6 +5,8 @@
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <UseWPF>true</UseWPF>
+    <ApplicationIcon>Assets\AppIcon.ico</ApplicationIcon>
+    <InterceptorsNamespaces>$(InterceptorsNamespaces);Microsoft.Extensions.Configuration.Binder.SourceGeneration</InterceptorsNamespaces>
   </PropertyGroup>
 
   <ItemGroup>
@@ -18,6 +20,10 @@
     <PackageReference Include="SSH.NET" Version="2020.0.2" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Resource Include="Assets\AppIcon.ico" />
+  </ItemGroup>
+
   <ItemGroup>
     <None Update="appConfig.json">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
diff --git a/src/AxiOmron.PcbCheck/Converters/ResultCodeToTagTextConverter.cs b/src/AxiOmron.PcbCheck/Converters/ResultCodeToTagTextConverter.cs
index 30970a2..28cf4f1 100644
--- a/src/AxiOmron.PcbCheck/Converters/ResultCodeToTagTextConverter.cs
+++ b/src/AxiOmron.PcbCheck/Converters/ResultCodeToTagTextConverter.cs
@@ -5,7 +5,7 @@ using AxiOmron.PcbCheck.Models;
 namespace AxiOmron.PcbCheck.Converters;
 
 /// <summary>
-/// 将 <see cref="WorkflowResultCode"/>（以 <see cref="ushort"/> 存储）映射为简短 Tag 文本。
+/// 将 <see cref="WorkflowResultCode"/>（以 <see cref="short"/> 存储）映射为简短 Tag 文本。
 /// </summary>
 /// <remarks>
 /// 映射规则：Passed → "OK"；Processing → "处理中"；None → "-"；其余视为 "NG"。
@@ -20,21 +20,21 @@ public sealed class ResultCodeToTagTextConverter : IValueConverter
     /// <param name="parameter">扩展参数。</param>
     /// <param name="culture">当前区域信息。</param>
     /// <returns>简短标签文本。</returns>
-    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
     {
-        ushort code = value switch
+        short code = value switch
         {
-            ushort u => u,
-            int i => (ushort)i,
-            WorkflowResultCode rc => (ushort)rc,
-            _ => (ushort)0
+            short s => s,
+            int i => (short)i,
+            WorkflowResultCode rc => (short)rc,
+            _ => 0
         };
 
         return code switch
         {
-            (ushort)WorkflowResultCode.Passed => "OK",
-            (ushort)WorkflowResultCode.Processing => "处理中",
-            (ushort)WorkflowResultCode.None => "-",
+            (short)WorkflowResultCode.Passed => "OK",
+            (short)WorkflowResultCode.Processing => "处理中",
+            (short)WorkflowResultCode.None => "-",
             _ => "NG"
         };
     }
@@ -47,7 +47,7 @@ public sealed class ResultCodeToTagTextConverter : IValueConverter
     /// <param name="parameter">扩展参数。</param>
     /// <param name="culture">当前区域信息。</param>
     /// <returns>抛出不支持异常。</returns>
-    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
     {
         throw new NotSupportedException();
     }
diff --git a/src/AxiOmron.PcbCheck/DesignTime/DesignTimeAppStateStore.cs b/src/AxiOmron.PcbCheck/DesignTime/DesignTimeAppStateStore.cs
index 063cb9d..fac8ace 100644
--- a/src/AxiOmron.PcbCheck/DesignTime/DesignTimeAppStateStore.cs
+++ b/src/AxiOmron.PcbCheck/DesignTime/DesignTimeAppStateStore.cs
@@ -32,7 +32,7 @@ public sealed class DesignTimeAppStateStore : IAppStateStore
             CurrentBarcode = "PCB240417000128",
             ResultDescription = "已扫码，等待 SFTP 文件确认",
             FaultMessage = string.Empty,
-            ResultCode = (ushort)WorkflowResultCode.Processing,
+            ResultCode = (short)WorkflowResultCode.Processing,
             LastTriggeredAt = now.AddSeconds(-18),
             LastCompletedAt = now.AddMinutes(-2),
             IsBusy = true,
@@ -44,7 +44,7 @@ public sealed class DesignTimeAppStateStore : IAppStateStore
         _snapshot.PlcMonitorItems.Add(new PlcMonitorItem { GroupName = "Inputs", Name = "PlcAckRelease", Address = "10003", CurrentValue = "False", LastUpdatedAt = now.AddSeconds(-1) });
         _snapshot.PlcMonitorItems.Add(new PlcMonitorItem { GroupName = "Outputs", Name = "PcBusy", Address = "51", CurrentValue = "True", LastUpdatedAt = now.AddSeconds(-1) });
         _snapshot.PlcMonitorItems.Add(new PlcMonitorItem { GroupName = "Outputs", Name = "ReleasePermit", Address = "52", CurrentValue = "False", LastUpdatedAt = now.AddSeconds(-1) });
-        _snapshot.PlcMonitorItems.Add(new PlcMonitorItem { GroupName = "Registers", Name = "ResultCode", Address = "40001", CurrentValue = ((ushort)WorkflowResultCode.Processing).ToString(), LastUpdatedAt = now.AddSeconds(-1) });
+        _snapshot.PlcMonitorItems.Add(new PlcMonitorItem { GroupName = "Registers", Name = "ResultCode", Address = "40001", CurrentValue = ((short)WorkflowResultCode.Processing).ToString(), LastUpdatedAt = now.AddSeconds(-1) });
 
         _logs = new List<UiLogEntry>
         {
@@ -64,7 +64,7 @@ public sealed class DesignTimeAppStateStore : IAppStateStore
                 Barcode = "PCB240417000125",
                 ScanTryCount = 1,
                 SftpTryCount = 1,
-                ResultCode = (ushort)WorkflowResultCode.Passed,
+                ResultCode = (short)WorkflowResultCode.Passed,
                 ResultDescription = "OK 放行",
                 ReleaseSent = true,
                 ExceptionSummary = string.Empty
@@ -76,7 +76,7 @@ public sealed class DesignTimeAppStateStore : IAppStateStore
                 Barcode = "PCB240417000126",
                 ScanTryCount = 3,
                 SftpTryCount = 0,
-                ResultCode = (ushort)WorkflowResultCode.NgReleased,
+                ResultCode = (short)WorkflowResultCode.NgReleased,
                 ResultDescription = "扫码失败后放行",
                 ReleaseSent = true,
                 ExceptionSummary = "扫码连续失败三次"
@@ -88,7 +88,7 @@ public sealed class DesignTimeAppStateStore : IAppStateStore
                 Barcode = "PCB240417000127",
                 ScanTryCount = 1,
                 SftpTryCount = 3,
-                ResultCode = (ushort)WorkflowResultCode.NgReleased,
+                ResultCode = (short)WorkflowResultCode.NgReleased,
                 ResultDescription = "处理结果 NG，随后放行",
                 ReleaseSent = true,
                 ExceptionSummary = "SFTP 文件查询超时"
@@ -97,8 +97,8 @@ public sealed class DesignTimeAppStateStore : IAppStateStore
 
         _snapshot.RecordStatisticDate = DateOnly.FromDateTime(now.LocalDateTime.Date);
         _snapshot.TodayProcessCount = _records.Count;
-        _snapshot.TodayOkCount = _records.Count(record => record.ResultCode == (ushort)WorkflowResultCode.Passed);
-        _snapshot.TodayNgCount = _records.Count(record => record.ResultCode != (ushort)WorkflowResultCode.Passed);
+        _snapshot.TodayOkCount = _records.Count(record => record.ResultCode == (short)WorkflowResultCode.Passed);
+        _snapshot.TodayNgCount = _records.Count(record => record.ResultCode != (short)WorkflowResultCode.Passed);
         _snapshot.RecordsLastUpdatedAt = now;
         foreach (BoardProcessRecord record in _records)
         {
diff --git a/src/AxiOmron.PcbCheck/DesignTime/DesignTimePlcService.cs b/src/AxiOmron.PcbCheck/DesignTime/DesignTimePlcService.cs
new file mode 100644
index 0000000..0635212
--- /dev/null
+++ b/src/AxiOmron.PcbCheck/DesignTime/DesignTimePlcService.cs
@@ -0,0 +1,64 @@
+using AxiOmron.PcbCheck.Models;
+using AxiOmron.PcbCheck.Services.Interfaces;
+
+namespace AxiOmron.PcbCheck.DesignTime;
+
+/// <summary>
+/// 为设计器提供 PLC 通信能力的设计时占位服务，所有方法均为无副作用实现。
+/// </summary>
+public sealed class DesignTimePlcService : IPlcService
+{
+    /// <summary>
+    /// 返回设计时输入信号快照。
+    /// </summary>
+    /// <param name="cancellationToken">取消令牌。</param>
+    /// <returns>空的输入信号快照。</returns>
+    public Task<PlcSignalSnapshot> ReadSignalsAsync(CancellationToken cancellationToken)
+    {
+        return Task.FromResult(new PlcSignalSnapshot());
+    }
+
+    /// <summary>
+    /// 返回设计时监控镜像快照。
+    /// </summary>
+    /// <param name="cancellationToken">取消令牌。</param>
+    /// <returns>空的监控镜像快照。</returns>
+    public Task<PlcMonitorSnapshot> ReadMonitorSnapshotAsync(CancellationToken cancellationToken)
+    {
+        return Task.FromResult(new PlcMonitorSnapshot());
+    }
+
+    /// <summary>
+    /// 模拟写入流程状态，不执行实际设备通信。
+    /// </summary>
+    /// <param name="state">待写入状态。</param>
+    /// <param name="cancellationToken">取消令牌。</param>
+    /// <returns>已完成任务。</returns>
+    public Task WriteStateAsync(PlcProcessState state, CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
+
+    /// <summary>
+    /// 模拟 PLC 重连，不执行实际设备通信。
+    /// </summary>
+    /// <param name="cancellationToken">取消令牌。</param>
+    /// <returns>已完成任务。</returns>
+    public Task ForceReconnectAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
+
+    /// <summary>
+    /// 返回设计时测试写入成功结果，不执行实际设备通信。
+    /// </summary>
+    /// <param name="address">目标地址。</param>
+    /// <param name="type">变量类型。</param>
+    /// <param name="value">写入值文本。</param>
+    /// <param name="cancellationToken">取消令牌。</param>
+    /// <returns>固定成功结果。</returns>
+    public Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken)
+    {
+        return Task.FromResult(PlcWriteResult.Success(address, type, value));
+    }
+}
diff --git a/src/AxiOmron.PcbCheck/DesignTime/DesignTimeViewModelLocator.cs b/src/AxiOmron.PcbCheck/DesignTime/DesignTimeViewModelLocator.cs
index c8b56c4..27b896a 100644
--- a/src/AxiOmron.PcbCheck/DesignTime/DesignTimeViewModelLocator.cs
+++ b/src/AxiOmron.PcbCheck/DesignTime/DesignTimeViewModelLocator.cs
@@ -15,6 +15,7 @@ public sealed class DesignTimeViewModelLocator
     private readonly DesignTimeAppConfigService _appConfigService = new();
     private readonly DesignTimeAdminUnlockDialogService _adminUnlockDialogService = new();
     private readonly DesignTimeSftpLookupService _sftpLookupService = new();
+    private readonly DesignTimePlcService _plcService = new();
     private MainWindowViewModel? _mainWindowViewModel;
     private SystemSettingViewModel? _systemSettingViewModel;
 
@@ -28,7 +29,7 @@ public sealed class DesignTimeViewModelLocator
     /// 获取系统设置设计时视图模型。
     /// </summary>
     public SystemSettingViewModel SystemSettingViewModel
-        => _systemSettingViewModel ??= new SystemSettingViewModel(_appConfigService, _sftpLookupService, _appStateStore, _dispatcherService);
+        => _systemSettingViewModel ??= new SystemSettingViewModel(_appConfigService, _sftpLookupService, _appStateStore, _dispatcherService, _plcService);
 
     /// <summary>
     /// 创建首页设计时视图模型。
diff --git a/src/AxiOmron.PcbCheck/MainWindow.xaml b/src/AxiOmron.PcbCheck/MainWindow.xaml
index 14538d0..d4d9ae3 100644
--- a/src/AxiOmron.PcbCheck/MainWindow.xaml
+++ b/src/AxiOmron.PcbCheck/MainWindow.xaml
@@ -10,6 +10,7 @@
         Height="950"
         MinWidth="1400"
         MinHeight="860"
+        Icon="Assets/AppIcon.ico"
         Background="{DynamicResource {x:Static hc:ResourceToken.BackgroundBrush}}"
         WindowStartupLocation="CenterScreen">
     <Grid>
diff --git a/src/AxiOmron.PcbCheck/Models/PlcWriteModels.cs b/src/AxiOmron.PcbCheck/Models/PlcWriteModels.cs
new file mode 100644
index 0000000..566a2e9
--- /dev/null
+++ b/src/AxiOmron.PcbCheck/Models/PlcWriteModels.cs
@@ -0,0 +1,105 @@
+namespace AxiOmron.PcbCheck.Models;
+
+/// <summary>
+/// 表示 PLC 测试写入支持的变量类型。
+/// </summary>
+public enum PlcWriteType
+{
+    /// <summary>
+    /// 布尔位。
+    /// </summary>
+    Bool = 0,
+
+    /// <summary>
+    /// 有符号 16 位整数。
+    /// </summary>
+    Int16 = 1,
+
+    /// <summary>
+    /// 无符号 16 位整数。
+    /// </summary>
+    UInt16 = 2,
+
+    /// <summary>
+    /// 有符号 32 位整数。
+    /// </summary>
+    Int32 = 3,
+
+    /// <summary>
+    /// 无符号 32 位整数。
+    /// </summary>
+    UInt32 = 4,
+
+    /// <summary>
+    /// 单精度浮点数。
+    /// </summary>
+    Float = 5
+}
+
+/// <summary>
+/// 表示一次 PLC 测试写入的执行结果。
+/// </summary>
+public sealed record PlcWriteResult
+{
+    /// <summary>
+    /// 获取一个值，指示写入是否成功。
+    /// </summary>
+    public bool IsSuccess { get; init; }
+
+    /// <summary>
+    /// 获取面向用户的结果说明。
+    /// </summary>
+    public string Message { get; init; } = string.Empty;
+
+    /// <summary>
+    /// 获取本次写入的目标地址。
+    /// </summary>
+    public string Address { get; init; } = string.Empty;
+
+    /// <summary>
+    /// 获取本次写入的变量类型名称。
+    /// </summary>
+    public string TypeName { get; init; } = string.Empty;
+
+    /// <summary>
+    /// 获取本次实际写入的文本值。
+    /// </summary>
+    public string WrittenText { get; init; } = string.Empty;
+
+    /// <summary>
+    /// 创建一个表示写入成功的结果。
+    /// </summary>
+    /// <param name="address">目标地址。</param>
+    /// <param name="type">变量类型。</param>
+    /// <param name="writtenText">实际写入的文本值。</param>
+    /// <returns>成功结果对象。</returns>
+    public static PlcWriteResult Success(string address, PlcWriteType type, string writtenText)
+    {
+        return new PlcWriteResult
+        {
+            IsSuccess = true,
+            Address = address,
+            TypeName = type.ToString(),
+            WrittenText = writtenText,
+            Message = $"写入成功：{address} = {writtenText} ({type})"
+        };
+    }
+
+    /// <summary>
+    /// 创建一个表示写入失败的结果。
+    /// </summary>
+    /// <param name="address">目标地址。</param>
+    /// <param name="type">变量类型。</param>
+    /// <param name="message">失败说明。</param>
+    /// <returns>失败结果对象。</returns>
+    public static PlcWriteResult Failure(string address, PlcWriteType type, string message)
+    {
+        return new PlcWriteResult
+        {
+            IsSuccess = false,
+            Address = address,
+            TypeName = type.ToString(),
+            Message = message
+        };
+    }
+}
diff --git a/src/AxiOmron.PcbCheck/Models/RuntimeSnapshot.cs b/src/AxiOmron.PcbCheck/Models/RuntimeSnapshot.cs
index 3b1c1f5..1911f6f 100644
--- a/src/AxiOmron.PcbCheck/Models/RuntimeSnapshot.cs
+++ b/src/AxiOmron.PcbCheck/Models/RuntimeSnapshot.cs
@@ -63,7 +63,7 @@ public sealed class RuntimeSnapshot
     /// <summary>
     /// 获取或设置结果代码。
     /// </summary>
-    public ushort ResultCode { get; set; }
+    public short ResultCode { get; set; }
 
     /// <summary>
     /// 获取或设置上次触发时间。
diff --git a/src/AxiOmron.PcbCheck/Models/WorkflowModels.cs b/src/AxiOmron.PcbCheck/Models/WorkflowModels.cs
index a4fb15a..06e9128 100644
--- a/src/AxiOmron.PcbCheck/Models/WorkflowModels.cs
+++ b/src/AxiOmron.PcbCheck/Models/WorkflowModels.cs
@@ -69,7 +69,7 @@ public enum WorkflowState
 /// <summary>
 /// 表示最终结果代码定义。
 /// </summary>
-public enum WorkflowResultCode : ushort
+public enum WorkflowResultCode : short
 {
     /// <summary>
     /// 无结果。
@@ -182,7 +182,7 @@ public sealed class PlcProcessState
     /// <summary>
     /// 获取或设置结果代码寄存器值。
     /// </summary>
-    public ushort ResultCode { get; set; }
+    public short ResultCode { get; set; }
 
     /// <summary>
     /// 创建当前状态对象的浅拷贝。
@@ -496,7 +496,7 @@ public sealed class BoardProcessRecord
     /// <summary>
     /// 获取或设置结果代码。
     /// </summary>
-    public ushort ResultCode { get; set; }
+    public short ResultCode { get; set; }
 
     /// <summary>
     /// 获取或设置结果描述。
diff --git a/src/AxiOmron.PcbCheck/Options/AppConfig.cs b/src/AxiOmron.PcbCheck/Options/AppConfig.cs
index c995fad..87713c7 100644
--- a/src/AxiOmron.PcbCheck/Options/AppConfig.cs
+++ b/src/AxiOmron.PcbCheck/Options/AppConfig.cs
@@ -129,6 +129,11 @@ public sealed class PlcOptions
     /// </summary>
     public byte SourceNodeAddress { get; set; } = 25;
 
+    /// <summary>
+    /// 获取或设置 PLC 寄存器字节序，默认使用 BADC 以匹配现场 D 区 Int16 高低字节顺序。
+    /// </summary>
+    public string? EndianFormat { get; set; } = "BADC";
+
     /// <summary>
     /// 获取或设置轮询周期，单位为毫秒。
     /// </summary>
diff --git a/src/AxiOmron.PcbCheck/Properties/PublishProfiles/FolderProfile.pubxml b/src/AxiOmron.PcbCheck/Properties/PublishProfiles/FolderProfile.pubxml
index 1e728be..6af5f01 100644
--- a/src/AxiOmron.PcbCheck/Properties/PublishProfiles/FolderProfile.pubxml
+++ b/src/AxiOmron.PcbCheck/Properties/PublishProfiles/FolderProfile.pubxml
@@ -1,15 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project>
-  <PropertyGroup>
-    <Configuration>Release</Configuration>
-    <Platform>Any CPU</Platform>
-    <PublishDir>bin\Release\net8.0-windows\publish\</PublishDir>
-    <PublishProtocol>FileSystem</PublishProtocol>
-    <TargetFramework>net8.0-windows</TargetFramework>
-    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
-    <SelfContained>false</SelfContained>
-    <PublishSingleFile>true</PublishSingleFile>
-    <IncludeNativeLibrariesForSelfExtract>false</IncludeNativeLibrariesForSelfExtract>
-    <EnableCompressionInSingleFile>false</EnableCompressionInSingleFile>
-  </PropertyGroup>
-</Project>
+<?xml version="1.0" encoding="utf-8"?>
+<!-- https://go.microsoft.com/fwlink/?LinkID=208121. -->
+<Project>
+  <PropertyGroup>
+    <Configuration>Release</Configuration>
+    <Platform>Any CPU</Platform>
+    <PublishDir>bin\Release\net8.0-windows\publish\</PublishDir>
+    <PublishProtocol>FileSystem</PublishProtocol>
+    <_TargetId>Folder</_TargetId>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <SelfContained>false</SelfContained>
+  </PropertyGroup>
+</Project>
\ No newline at end of file
diff --git a/src/AxiOmron.PcbCheck/Properties/launchSettings.json b/src/AxiOmron.PcbCheck/Properties/launchSettings.json
deleted file mode 100644
index 714055d..0000000
--- a/src/AxiOmron.PcbCheck/Properties/launchSettings.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "profiles": {
-    "AxiOmron.PcbCheck": {
-      "commandName": "Project",
-      "environmentVariables": {
-        "DOTNET_ENVIRONMENT": "Development"
-      }
-    }
-  }
-}
diff --git a/src/AxiOmron.PcbCheck/Services/Implementations/CsvBoardRecordRepository.cs b/src/AxiOmron.PcbCheck/Services/Implementations/CsvBoardRecordRepository.cs
index 1f786de..ea680eb 100644
--- a/src/AxiOmron.PcbCheck/Services/Implementations/CsvBoardRecordRepository.cs
+++ b/src/AxiOmron.PcbCheck/Services/Implementations/CsvBoardRecordRepository.cs
@@ -247,10 +247,10 @@ public sealed class CsvBoardRecordRepository : IBoardRecordRepository
             {
                 StatisticDate = date,
                 TotalCount = records.Count,
-                OkCount = records.Count(record => record.ResultCode == (ushort)WorkflowResultCode.Passed),
-                NgCount = records.Count(record => record.ResultCode != (ushort)WorkflowResultCode.Passed
-                    && record.ResultCode != (ushort)WorkflowResultCode.Processing
-                    && record.ResultCode != (ushort)WorkflowResultCode.None),
+                OkCount = records.Count(record => record.ResultCode == (short)WorkflowResultCode.Passed),
+                NgCount = records.Count(record => record.ResultCode != (short)WorkflowResultCode.Passed
+                    && record.ResultCode != (short)WorkflowResultCode.Processing
+                    && record.ResultCode != (short)WorkflowResultCode.None),
                 LastUpdatedAt = _timeProvider.GetLocalNow()
             };
 
@@ -400,7 +400,7 @@ public sealed class CsvBoardRecordRepository : IBoardRecordRepository
             || !DateTimeOffset.TryParse(fields[1], out DateTimeOffset completedAt)
             || !int.TryParse(fields[3], out int scanTryCount)
             || !int.TryParse(fields[4], out int sftpTryCount)
-            || !ushort.TryParse(fields[5], out ushort resultCode)
+            || !short.TryParse(fields[5], out short resultCode)
             || !bool.TryParse(fields[7], out bool releaseSent)
             || !bool.TryParse(fields[8], out bool alarmRaised))
         {
diff --git a/src/AxiOmron.PcbCheck/Services/Implementations/FileCheckPathMatcher.cs b/src/AxiOmron.PcbCheck/Services/Implementations/FileCheckPathMatcher.cs
index 98fb0ad..5194942 100644
--- a/src/AxiOmron.PcbCheck/Services/Implementations/FileCheckPathMatcher.cs
+++ b/src/AxiOmron.PcbCheck/Services/Implementations/FileCheckPathMatcher.cs
@@ -29,7 +29,6 @@ internal static class FileCheckPathMatcher
     public static bool IsMatch(string fileName, string candidateName, string barcode)
     {
         return fileName.Equals(candidateName, StringComparison.OrdinalIgnoreCase)
-            || WildcardMatcher.IsMatch(fileName, candidateName)
-            || fileName.Contains(barcode, StringComparison.OrdinalIgnoreCase);
+            || WildcardMatcher.IsMatch(fileName, candidateName);
     }
 }
diff --git a/src/AxiOmron.PcbCheck/Services/Implementations/OmronFinsPlcService.cs b/src/AxiOmron.PcbCheck/Services/Implementations/OmronFinsPlcService.cs
index f22c7fc..4e50ea2 100644
--- a/src/AxiOmron.PcbCheck/Services/Implementations/OmronFinsPlcService.cs
+++ b/src/AxiOmron.PcbCheck/Services/Implementations/OmronFinsPlcService.cs
@@ -89,7 +89,7 @@ public sealed class OmronFinsPlcService : IPlcService, IDisposable
                 {
                     PcBusy = ReadBoolean(ToDataMemoryAddress(_options.Outputs.PcBusy)),
                     ReleasePermit = ReadBoolean(ToDataMemoryAddress(_options.Outputs.ReleasePermit)),
-                    ResultCode = ReadUInt16(ToDataMemoryAddress(_options.Registers.ResultCode))
+                    ResultCode = ReadInt16(ToDataMemoryAddress(_options.Registers.ResultCode))
                 },
                 CapturedAt = capturedAt
             };
@@ -155,6 +155,54 @@ public sealed class OmronFinsPlcService : IPlcService, IDisposable
         }
     }
 
+    /// <summary>
+    /// 向指定地址写入一个原始值，供调试界面手动测试使用。
+    /// 复用与回读相同的 <see cref="_ioLock"/> 串行化，且不修改 <see cref="_lastWrittenState"/>，因此不会干扰后台轮询回读与流程状态机写入。
+    /// </summary>
+    /// <param name="address">完整的 FINS 地址字符串，例如 <c>D100</c> 或 <c>D100.0</c>。</param>
+    /// <param name="type">写入的变量类型。</param>
+    /// <param name="value">待写入值的文本表示。</param>
+    /// <param name="cancellationToken">取消令牌。取消后立即终止本次写入并返回已取消任务。</param>
+    /// <returns>包含成功状态与说明的写入结果。</returns>
+    public async Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken)
+    {
+        string trimmedAddress = address.Trim();
+        if (string.IsNullOrEmpty(trimmedAddress))
+        {
+            return PlcWriteResult.Failure(trimmedAddress, type, "写入失败：地址不能为空。");
+        }
+
+        if (!TryParseWriteValue(type, value, out object parsedValue, out string parseError))
+        {
+            return PlcWriteResult.Failure(trimmedAddress, type, $"写入失败：{parseError}");
+        }
+
+        await _ioLock.WaitAsync(cancellationToken).ConfigureAwait(false);
+        try
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            EnsureConnected();
+            WriteRawValueUnsafe(trimmedAddress, parsedValue);
+            string writtenText = FormatWrittenText(parsedValue);
+            _logger.LogInformation("测试写入 PLC 成功，地址={Address}，类型={Type}，值={Value}", true, trimmedAddress, type, writtenText);
+            return PlcWriteResult.Success(trimmedAddress, type, writtenText);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch (Exception ex)
+        {
+            // 仅记录并返回失败结果，不断开连接，避免干扰后台轮询回读循环。
+            _logger.LogWarning(ex, "测试写入 PLC 失败，地址={Address}，类型={Type}", true, trimmedAddress, type);
+            return PlcWriteResult.Failure(trimmedAddress, type, $"写入失败：{ex.Message}");
+        }
+        finally
+        {
+            _ioLock.Release();
+        }
+    }
+
     /// <summary>
     /// 释放 PLC 通信资源。
     /// </summary>
@@ -181,7 +229,8 @@ public sealed class OmronFinsPlcService : IPlcService, IDisposable
         }
 
         DisconnectUnsafe();
-        var client = new OmronFinsClient(_options.Host, _options.Port, _options.ConnectTimeoutMs, EndianFormat.ABCD)
+        EndianFormat endianFormat = ResolveEndianFormat(_options);
+        var client = new OmronFinsClient(_options.Host, _options.Port, _options.ConnectTimeoutMs, endianFormat)
         {
             UnitAddress = _options.UnitAddress,
             SA1 = _options.SourceNodeAddress
@@ -189,7 +238,28 @@ public sealed class OmronFinsPlcService : IPlcService, IDisposable
         var openResult = client.Open();
         EnsureSuccess(openResult.IsSucceed, openResult.Err, "连接 OMRON FINS PLC 失败");
         _client = client;
-        _logger.LogInformation("已通过 IoTClient FINS 连接 PLC {Host}:{Port}", false, _options.Host, _options.Port);
+        _logger.LogInformation("已通过 IoTClient FINS 连接 PLC {Host}:{Port}，字节序={EndianFormat}", false, _options.Host, _options.Port, endianFormat);
+    }
+
+    /// <summary>
+    /// 解析 PLC 字节序配置。
+    /// </summary>
+    /// <param name="options">PLC 通信配置。</param>
+    /// <returns>IoTClient 使用的字节序枚举。</returns>
+    /// <exception cref="ArgumentNullException">当 <paramref name="options"/> 为空时抛出。</exception>
+    /// <exception cref="InvalidOperationException">当字节序配置为空或无法识别时抛出。</exception>
+    internal static EndianFormat ResolveEndianFormat(PlcOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+
+        string? configuredValue = options.EndianFormat?.Trim();
+        if (string.IsNullOrWhiteSpace(configuredValue)
+            || !Enum.TryParse(configuredValue, ignoreCase: true, out EndianFormat endianFormat))
+        {
+            throw new InvalidOperationException($"PLC 字节序配置无效：{options.EndianFormat}。支持值：ABCD、BADC、CDAB、DCBA。");
+        }
+
+        return endianFormat;
     }
 
     /// <summary>
@@ -206,15 +276,15 @@ public sealed class OmronFinsPlcService : IPlcService, IDisposable
     }
 
     /// <summary>
-    /// 读取单个 D 区无符号整数。
+    /// 读取单个 D 区有符号 16 位整数。
     /// </summary>
     /// <param name="address">FINS 地址。</param>
     /// <returns>读取到的寄存器值。</returns>
-    private ushort ReadUInt16(string address)
+    private short ReadInt16(string address)
     {
         var client = _client ?? throw new InvalidOperationException("PLC 客户端尚未初始化。");
-        var result = client.ReadUInt16(address);
-        EnsureSuccess(result.IsSucceed, result.Err, $"读取 FINS UInt16 失败，地址={address}");
+        var result = client.ReadInt16(address);
+        EnsureSuccess(result.IsSucceed, result.Err, $"读取 FINS Int16 失败，地址={address}");
         return result.Value;
     }
 
@@ -225,9 +295,10 @@ public sealed class OmronFinsPlcService : IPlcService, IDisposable
     private void WriteChangedState(PlcProcessState state)
     {
         var previous = _lastWrittenState;
+        short? previousResultCode = previous is null ? null : previous.ResultCode;
         WriteBooleanIfChanged(previous?.PcBusy, state.PcBusy, ToDataMemoryAddress(_options.Outputs.PcBusy));
         WriteBooleanIfChanged(previous?.ReleasePermit, state.ReleasePermit, ToDataMemoryAddress(_options.Outputs.ReleasePermit));
-        WriteUInt16IfChanged(previous?.ResultCode, state.ResultCode, ToDataMemoryAddress(_options.Registers.ResultCode));
+        WriteInt16IfChanged(previousResultCode, state.ResultCode, ToDataMemoryAddress(_options.Registers.ResultCode));
     }
 
     /// <summary>
@@ -249,12 +320,12 @@ public sealed class OmronFinsPlcService : IPlcService, IDisposable
     }
 
     /// <summary>
-    /// 仅当值发生变化时写入单个 D 区无符号整数。
+    /// 仅当值发生变化时写入单个 D 区有符号 16 位整数。
     /// </summary>
     /// <param name="previous">上一值。</param>
     /// <param name="current">当前值。</param>
     /// <param name="address">FINS 地址。</param>
-    private void WriteUInt16IfChanged(ushort? previous, ushort current, string address)
+    private void WriteInt16IfChanged(short? previous, short current, string address)
     {
         if (previous.HasValue && previous.Value == current)
         {
@@ -263,7 +334,148 @@ public sealed class OmronFinsPlcService : IPlcService, IDisposable
 
         var client = _client ?? throw new InvalidOperationException("PLC 客户端尚未初始化。");
         var result = client.Write(address, current);
-        EnsureSuccess(result.IsSucceed, result.Err, $"写入 FINS UInt16 失败，地址={address}，值={current}");
+        EnsureSuccess(result.IsSucceed, result.Err, $"写入 FINS Int16 失败，地址={address}，值={current}");
+    }
+
+    /// <summary>
+    /// 按变量类型将文本值解析为强类型对象。
+    /// </summary>
+    /// <param name="type">变量类型。</param>
+    /// <param name="value">待解析的文本值。</param>
+    /// <param name="parsedValue">解析成功时返回的强类型值。</param>
+    /// <param name="error">解析失败时返回的错误说明。</param>
+    /// <returns>解析成功返回 <see langword="true"/>；否则返回 <see langword="false"/>。</returns>
+    private static bool TryParseWriteValue(PlcWriteType type, string value, out object parsedValue, out string error)
+    {
+        parsedValue = default!;
+        error = string.Empty;
+        string text = value.Trim();
+        if (string.IsNullOrEmpty(text))
+        {
+            error = "写入值不能为空。";
+            return false;
+        }
+
+        switch (type)
+        {
+            case PlcWriteType.Bool:
+                if (TryParseBoolean(text, out bool boolValue))
+                {
+                    parsedValue = boolValue;
+                    return true;
+                }
+
+                error = "布尔值仅支持 1/0、true/false。";
+                return false;
+            case PlcWriteType.Int16:
+                if (short.TryParse(text, out short shortValue))
+                {
+                    parsedValue = shortValue;
+                    return true;
+                }
+
+                error = $"无法将 '{text}' 解析为 Int16。";
+                return false;
+            case PlcWriteType.UInt16:
+                if (ushort.TryParse(text, out ushort ushortValue))
+                {
+                    parsedValue = ushortValue;
+                    return true;
+                }
+
+                error = $"无法将 '{text}' 解析为 UInt16。";
+                return false;
+            case PlcWriteType.Int32:
+                if (int.TryParse(text, out int intValue))
+                {
+                    parsedValue = intValue;
+                    return true;
+                }
+
+                error = $"无法将 '{text}' 解析为 Int32。";
+                return false;
+            case PlcWriteType.UInt32:
+                if (uint.TryParse(text, out uint uintValue))
+                {
+                    parsedValue = uintValue;
+                    return true;
+                }
+
+                error = $"无法将 '{text}' 解析为 UInt32。";
+                return false;
+            case PlcWriteType.Float:
+                if (float.TryParse(text, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out float floatValue))
+                {
+                    parsedValue = floatValue;
+                    return true;
+                }
+
+                error = $"无法将 '{text}' 解析为 Float。";
+                return false;
+            default:
+                error = $"不支持的变量类型：{type}。";
+                return false;
+        }
+    }
+
+    /// <summary>
+    /// 解析布尔文本，接受 1/0 与 true/false（忽略大小写）。
+    /// </summary>
+    /// <param name="text">待解析文本。</param>
+    /// <param name="result">解析结果。</param>
+    /// <returns>解析成功返回 <see langword="true"/>；否则返回 <see langword="false"/>。</returns>
+    private static bool TryParseBoolean(string text, out bool result)
+    {
+        switch (text.ToLowerInvariant())
+        {
+            case "1":
+            case "true":
+                result = true;
+                return true;
+            case "0":
+            case "false":
+                result = false;
+                return true;
+            default:
+                result = false;
+                return false;
+        }
+    }
+
+    /// <summary>
+    /// 按强类型值调用 IoTClient 对应写入重载。
+    /// </summary>
+    /// <param name="address">FINS 地址。</param>
+    /// <param name="parsedValue">已解析的强类型值。</param>
+    private void WriteRawValueUnsafe(string address, object parsedValue)
+    {
+        var client = _client ?? throw new InvalidOperationException("PLC 客户端尚未初始化。");
+        var result = parsedValue switch
+        {
+            bool boolValue => client.Write(address, boolValue),
+            short shortValue => client.Write(address, shortValue),
+            ushort ushortValue => client.Write(address, ushortValue),
+            int intValue => client.Write(address, intValue),
+            uint uintValue => client.Write(address, uintValue),
+            float floatValue => client.Write(address, floatValue),
+            _ => throw new InvalidOperationException($"不支持的写入值类型：{parsedValue.GetType().Name}。")
+        };
+
+        EnsureSuccess(result.IsSucceed, result.Err, $"写入 FINS 值失败，地址={address}");
+    }
+
+    /// <summary>
+    /// 将强类型值格式化为用于展示的文本。
+    /// </summary>
+    /// <param name="parsedValue">已解析的强类型值。</param>
+    /// <returns>文本表示。</returns>
+    private static string FormatWrittenText(object parsedValue)
+    {
+        return parsedValue switch
+        {
+            float floatValue => floatValue.ToString(System.Globalization.CultureInfo.InvariantCulture),
+            _ => parsedValue.ToString() ?? string.Empty
+        };
     }
 
     /// <summary>
diff --git a/src/AxiOmron.PcbCheck/Services/Implementations/WorkflowHostedService.cs b/src/AxiOmron.PcbCheck/Services/Implementations/WorkflowHostedService.cs
index f34f8a7..25c8d8f 100644
--- a/src/AxiOmron.PcbCheck/Services/Implementations/WorkflowHostedService.cs
+++ b/src/AxiOmron.PcbCheck/Services/Implementations/WorkflowHostedService.cs
@@ -848,7 +848,7 @@ public sealed class WorkflowHostedService : BackgroundService, IWorkflowControlS
                 Barcode = _currentBarcode,
                 ScanTryCount = _scanTryCount,
                 SftpTryCount = _sftpTryCount,
-                ResultCode = (ushort)_resultCode,
+                ResultCode = (short)_resultCode,
                 ResultDescription = GetResultDescription(_resultCode),
                 ReleaseSent = _releaseSent,
                 AlarmRaised = false,
@@ -1082,7 +1082,7 @@ public sealed class WorkflowHostedService : BackgroundService, IWorkflowControlS
             lock (_stateSyncRoot)
             {
                 updateAction(_plcState);
-                _plcState.ResultCode = (ushort)_resultCode;
+                _plcState.ResultCode = (short)_resultCode;
                 snapshot = _plcState.Clone();
             }
 
@@ -1103,7 +1103,7 @@ public sealed class WorkflowHostedService : BackgroundService, IWorkflowControlS
     {
         DateTimeOffset? startedAt;
         string barcode;
-        ushort resultCode;
+        short resultCode;
         bool isBusy;
         string faultMessage;
 
@@ -1111,7 +1111,7 @@ public sealed class WorkflowHostedService : BackgroundService, IWorkflowControlS
         {
             startedAt = _currentBoardStartedAt;
             barcode = _currentBarcode;
-            resultCode = (ushort)_resultCode;
+            resultCode = (short)_resultCode;
             isBusy = _plcState.PcBusy;
             faultMessage = _faultLatched ? description : string.Empty;
         }
diff --git a/src/AxiOmron.PcbCheck/Services/Interfaces/CoreInterfaces.cs b/src/AxiOmron.PcbCheck/Services/Interfaces/CoreInterfaces.cs
index e5a1bd2..a48befc 100644
--- a/src/AxiOmron.PcbCheck/Services/Interfaces/CoreInterfaces.cs
+++ b/src/AxiOmron.PcbCheck/Services/Interfaces/CoreInterfaces.cs
@@ -124,6 +124,17 @@ public interface IPlcService
     /// <param name="cancellationToken">取消令牌。</param>
     /// <returns>表示重连完成的任务。</returns>
     Task ForceReconnectAsync(CancellationToken cancellationToken);
+
+    /// <summary>
+    /// 向指定地址写入一个原始值，供调试界面手动测试使用。
+    /// 该写入复用与回读相同的 IO 串行化机制，且不会影响流程状态机的写入缓存，因此不会干扰后台轮询回读。
+    /// </summary>
+    /// <param name="address">完整的 FINS 地址字符串，例如 <c>D100</c> 或 <c>D100.0</c>。</param>
+    /// <param name="type">写入的变量类型。</param>
+    /// <param name="value">待写入值的文本表示，由实现按 <paramref name="type"/> 解析。</param>
+    /// <param name="cancellationToken">取消令牌。取消后立即终止本次写入并返回已取消任务。</param>
+    /// <returns>包含成功状态与说明的写入结果。</returns>
+    Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken);
 }
 
 /// <summary>
diff --git a/src/AxiOmron.PcbCheck/ViewModels/MainWindowViewModel.cs b/src/AxiOmron.PcbCheck/ViewModels/MainWindowViewModel.cs
index 3f7d94b..1102cf1 100644
--- a/src/AxiOmron.PcbCheck/ViewModels/MainWindowViewModel.cs
+++ b/src/AxiOmron.PcbCheck/ViewModels/MainWindowViewModel.cs
@@ -150,7 +150,7 @@ public partial class MainWindowViewModel : ObservableObject
     /// 获取或设置结果代码。
     /// </summary>
     [ObservableProperty]
-    private ushort _resultCode;
+    private short _resultCode;
 
     /// <summary>
     /// 获取或设置最近触发时间。
@@ -182,6 +182,12 @@ public partial class MainWindowViewModel : ObservableObject
     [ObservableProperty]
     private string _lastLogUpdateTime = "-";
 
+    /// <summary>
+    /// 获取或设置运行日志区域是否展开；该状态仅影响首页布局，不参与业务流程。
+    /// </summary>
+    [ObservableProperty]
+    private bool _isLogAreaExpanded;
+
     /// <summary>
     /// 获取或设置今日异常日志条数。
     /// </summary>
@@ -367,6 +373,15 @@ public partial class MainWindowViewModel : ObservableObject
         LastLogUpdateTime = DateTimeOffset.Now.ToString("yyyy-MM-dd HH:mm:ss");
     }
 
+    /// <summary>
+    /// 切换运行日志区域展开状态，收起或恢复上方状态概览区域。
+    /// </summary>
+    [RelayCommand]
+    private void ToggleLogArea()
+    {
+        IsLogAreaExpanded = !IsLogAreaExpanded;
+    }
+
     /// <summary>
     /// 打开追踪区命令占位。后续应由导航服务跳转至追踪页面。
     /// </summary>
diff --git a/src/AxiOmron.PcbCheck/ViewModels/SystemSettingViewModel.cs b/src/AxiOmron.PcbCheck/ViewModels/SystemSettingViewModel.cs
index 332ec42..b7a3c32 100644
--- a/src/AxiOmron.PcbCheck/ViewModels/SystemSettingViewModel.cs
+++ b/src/AxiOmron.PcbCheck/ViewModels/SystemSettingViewModel.cs
@@ -4,7 +4,6 @@ using AxiOmron.PcbCheck.Options;
 using AxiOmron.PcbCheck.Services.Interfaces;
 using AxiOmron.PcbCheck.Models;
 using System.Collections.ObjectModel;
-using System.Collections.Generic;
 
 namespace AxiOmron.PcbCheck.ViewModels;
 
@@ -17,6 +16,7 @@ public partial class SystemSettingViewModel : ObservableObject
     private readonly IFileCheckService _fileCheckService;
     private readonly IAppStateStore _appStateStore;
     private readonly IDispatcherService _dispatcherService;
+    private readonly IPlcService _plcService;
 
     /// <summary>
     /// 初始化系统设置视图模型。
@@ -25,20 +25,24 @@ public partial class SystemSettingViewModel : ObservableObject
     /// <param name="fileCheckService">文件校验通道测试服务。</param>
     /// <param name="appStateStore">运行态快照存储。</param>
     /// <param name="dispatcherService">UI 线程调度服务。</param>
+    /// <param name="plcService">PLC 通信服务，用于调试界面的测试写入。</param>
     public SystemSettingViewModel(
         IAppConfigService appConfigService,
         IFileCheckService fileCheckService,
         IAppStateStore appStateStore,
-        IDispatcherService dispatcherService)
+        IDispatcherService dispatcherService,
+        IPlcService plcService)
     {
         _appConfigService = appConfigService ?? throw new ArgumentNullException(nameof(appConfigService));
         _fileCheckService = fileCheckService ?? throw new ArgumentNullException(nameof(fileCheckService));
         _appStateStore = appStateStore ?? throw new ArgumentNullException(nameof(appStateStore));
         _dispatcherService = dispatcherService ?? throw new ArgumentNullException(nameof(dispatcherService));
+        _plcService = plcService ?? throw new ArgumentNullException(nameof(plcService));
         EditableConfig = _appConfigService.Load();
         ConfigPath = _appConfigService.GetConfigPath();
         PlcMonitorItems = new ObservableCollection<PlcMonitorItem>();
         FileCheckProviders = Enum.GetValues<FileCheckProvider>();
+        PlcWriteTypes = Enum.GetValues<PlcWriteType>();
         ApplySnapshot(_appStateStore.GetSnapshot());
         _appStateStore.SnapshotChanged += OnSnapshotChanged;
         StatusMessage = "已加载配置。";
@@ -54,6 +58,11 @@ public partial class SystemSettingViewModel : ObservableObject
     /// </summary>
     public IReadOnlyList<FileCheckProvider> FileCheckProviders { get; }
 
+    /// <summary>
+    /// 获取 PLC 测试写入支持的变量类型可选项。
+    /// </summary>
+    public IReadOnlyList<PlcWriteType> PlcWriteTypes { get; }
+
     /// <summary>
     /// 获取或设置可编辑配置对象。
     /// </summary>
@@ -79,6 +88,37 @@ public partial class SystemSettingViewModel : ObservableObject
     [ObservableProperty]
     private bool _isTestingFileCheckConnection;
 
+    /// <summary>
+    /// 获取或设置测试写入的目标地址，例如 D100、D100.0。
+    /// </summary>
+    [ObservableProperty]
+    private string _plcWriteAddress = string.Empty;
+
+    /// <summary>
+    /// 获取或设置测试写入的变量类型。
+    /// </summary>
+    [ObservableProperty]
+    private PlcWriteType _selectedPlcWriteType = PlcWriteType.Int16;
+
+    /// <summary>
+    /// 获取或设置测试写入的值文本。
+    /// </summary>
+    [ObservableProperty]
+    private string _plcWriteValue = string.Empty;
+
+    /// <summary>
+    /// 获取或设置测试写入的状态提示文本。
+    /// </summary>
+    [ObservableProperty]
+    private string _plcWriteStatusMessage = string.Empty;
+
+    /// <summary>
+    /// 获取或设置当前是否正在执行 PLC 测试写入。
+    /// </summary>
+    [NotifyCanExecuteChangedFor(nameof(WritePlcValueCommand))]
+    [ObservableProperty]
+    private bool _isWritingPlc;
+
     /// <summary>
     /// 保存当前配置。
     /// </summary>
@@ -143,6 +183,44 @@ public partial class SystemSettingViewModel : ObservableObject
     /// </summary>
     private bool CanTestFileCheckConnection => !IsTestingFileCheckConnection;
 
+    /// <summary>
+    /// 执行一次 PLC 测试写入。该写入复用回读相同的 IO 串行化，不会干扰后台轮询回读。
+    /// </summary>
+    /// <returns>表示写入完成的任务。</returns>
+    [RelayCommand(CanExecute = nameof(CanWritePlcValue))]
+    private async Task WritePlcValueAsync()
+    {
+        if (string.IsNullOrWhiteSpace(PlcWriteAddress))
+        {
+            PlcWriteStatusMessage = "请先输入写入地址。";
+            return;
+        }
+
+        IsWritingPlc = true;
+        PlcWriteStatusMessage = "正在写入...";
+
+        try
+        {
+            PlcWriteResult result = await _plcService
+                .WriteRawValueAsync(PlcWriteAddress, SelectedPlcWriteType, PlcWriteValue, CancellationToken.None);
+
+            PlcWriteStatusMessage = result.Message;
+        }
+        catch (Exception ex)
+        {
+            PlcWriteStatusMessage = $"写入失败：{ex.Message}";
+        }
+        finally
+        {
+            IsWritingPlc = false;
+        }
+    }
+
+    /// <summary>
+    /// 判断当前是否允许执行 PLC 测试写入。
+    /// </summary>
+    private bool CanWritePlcValue => !IsWritingPlc;
+
     /// <summary>
     /// 将运行态快照中的 PLC 监控数据同步到当前视图模型。
     /// </summary>
diff --git a/src/AxiOmron.PcbCheck/Views/Pages/DashboardPage.xaml b/src/AxiOmron.PcbCheck/Views/Pages/DashboardPage.xaml
index bec7176..6073d05 100644
--- a/src/AxiOmron.PcbCheck/Views/Pages/DashboardPage.xaml
+++ b/src/AxiOmron.PcbCheck/Views/Pages/DashboardPage.xaml
@@ -639,11 +639,12 @@
             <Grid Grid.Row="2" Grid.Column="0">
                 <Grid.RowDefinitions>
                     <RowDefinition Height="Auto" />
-                    <RowDefinition Height="16" />
+                    <RowDefinition Height="Auto" />
                     <RowDefinition Height="*" />
                 </Grid.RowDefinitions>
 
-                <Grid Grid.Row="0">
+                <Grid Grid.Row="0"
+                      Visibility="{Binding IsLogAreaExpanded, Converter={StaticResource BooleanToVisibilityConverter}, ConverterParameter=Invert}">
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition Width="1.12*" />
                         <ColumnDefinition Width="12" />
@@ -775,6 +776,10 @@
                     </Border>
                 </Grid>
 
+                <Border Grid.Row="1"
+                        Height="16"
+                        Visibility="{Binding IsLogAreaExpanded, Converter={StaticResource BooleanToVisibilityConverter}, ConverterParameter=Invert}" />
+
                 <Border Grid.Row="2" Style="{StaticResource ModernCardStyle}">
                     <Grid>
                         <Grid.RowDefinitions>
@@ -809,17 +814,29 @@
                                     <ColumnDefinition Width="Auto" />
                                     <ColumnDefinition Width="8" />
                                     <ColumnDefinition Width="Auto" />
+                                    <ColumnDefinition Width="8" />
+                                    <ColumnDefinition Width="Auto" />
                                 </Grid.ColumnDefinitions>
 
                                 <Button Grid.Column="0"
+                                        Style="{StaticResource ToolbarButtonStyle}"
+                                        Command="{Binding ToggleLogAreaCommand}">
+                                    <Grid>
+                                        <TextBlock Text="展开日志"
+                                                   Visibility="{Binding IsLogAreaExpanded, Converter={StaticResource BooleanToVisibilityConverter}, ConverterParameter=Invert}" />
+                                        <TextBlock Text="恢复概览"
+                                                   Visibility="{Binding IsLogAreaExpanded, Converter={StaticResource BooleanToVisibilityConverter}}" />
+                                    </Grid>
+                                </Button>
+                                <Button Grid.Column="2"
                                         Content="全部"
                                         Style="{StaticResource ToolbarButtonStyle}"
                                         Command="{Binding ShowAllLogsCommand}" />
-                                <Button Grid.Column="2"
+                                <Button Grid.Column="4"
                                         Content="仅错误"
                                         Style="{StaticResource ToolbarButtonStyle}"
                                         Command="{Binding ShowErrorLogsCommand}" />
-                                <Button Grid.Column="4"
+                                <Button Grid.Column="6"
                                         Content="导出"
                                         Style="{StaticResource ToolbarButtonStyle}"
                                         Command="{Binding ExportLogsCommand}" />
diff --git a/src/AxiOmron.PcbCheck/Views/Pages/SystemSettingsPage.xaml b/src/AxiOmron.PcbCheck/Views/Pages/SystemSettingsPage.xaml
index 174075f..218e74e 100644
--- a/src/AxiOmron.PcbCheck/Views/Pages/SystemSettingsPage.xaml
+++ b/src/AxiOmron.PcbCheck/Views/Pages/SystemSettingsPage.xaml
@@ -140,6 +140,8 @@
             <TabItem Header="PLC监控">
                 <Grid Margin="16">
                     <Grid.RowDefinitions>
+                        <RowDefinition Height="Auto" />
+                        <RowDefinition Height="12" />
                         <RowDefinition Height="Auto" />
                         <RowDefinition Height="12" />
                         <RowDefinition Height="*" />
@@ -153,6 +155,60 @@
                     </StackPanel>
 
                     <Border Grid.Row="2"
+                            Background="White"
+                            BorderBrush="#E8ECF3"
+                            BorderThickness="1"
+                            CornerRadius="10"
+                            Padding="16,14">
+                        <StackPanel>
+                            <TextBlock Text="测试写入" FontSize="15" FontWeight="SemiBold" Foreground="#1F2937" />
+                            <TextBlock Text="手动向指定地址写入测试值，仅用于调试，不影响实时回读。"
+                                       Margin="0,4,0,0"
+                                       Foreground="#6B7280" />
+                            <Grid Margin="0,12,0,0">
+                                <Grid.ColumnDefinitions>
+                                    <ColumnDefinition Width="2*" />
+                                    <ColumnDefinition Width="12" />
+                                    <ColumnDefinition Width="1.4*" />
+                                    <ColumnDefinition Width="12" />
+                                    <ColumnDefinition Width="2*" />
+                                    <ColumnDefinition Width="12" />
+                                    <ColumnDefinition Width="Auto" />
+                                </Grid.ColumnDefinitions>
+                                <TextBox Grid.Column="0"
+                                         Style="{StaticResource TextBoxExtend}"
+                                         hc:InfoElement.Title="地址"
+                                         hc:InfoElement.TitlePlacement="Top"
+                                         hc:InfoElement.Placeholder="如 D100、D100.0"
+                                         Text="{Binding PlcWriteAddress, UpdateSourceTrigger=PropertyChanged}" />
+                                <ComboBox Grid.Column="2"
+                                          Style="{StaticResource ComboBoxExtend}"
+                                          hc:InfoElement.Title="变量类型"
+                                          hc:InfoElement.TitlePlacement="Top"
+                                          ItemsSource="{Binding PlcWriteTypes}"
+                                          SelectedItem="{Binding SelectedPlcWriteType}" />
+                                <TextBox Grid.Column="4"
+                                         Style="{StaticResource TextBoxExtend}"
+                                         hc:InfoElement.Title="写入值"
+                                         hc:InfoElement.TitlePlacement="Top"
+                                         hc:InfoElement.Placeholder="Bool 用 1/0 或 true/false"
+                                         Text="{Binding PlcWriteValue, UpdateSourceTrigger=PropertyChanged}" />
+                                <Button Grid.Column="6"
+                                        VerticalAlignment="Bottom"
+                                        Style="{StaticResource ButtonPrimary}"
+                                        Padding="18,8"
+                                        MinHeight="36"
+                                        Content="写入"
+                                        Command="{Binding WritePlcValueCommand}" />
+                            </Grid>
+                            <TextBlock Text="{Binding PlcWriteStatusMessage}"
+                                       Margin="0,10,0,0"
+                                       TextWrapping="Wrap"
+                                       Foreground="#2563EB" />
+                        </StackPanel>
+                    </Border>
+
+                    <Border Grid.Row="4"
                             Background="White"
                             BorderBrush="#E8ECF3"
                             BorderThickness="1"
diff --git a/src/AxiOmron.PcbCheck/appConfig.json b/src/AxiOmron.PcbCheck/appConfig.json
index 3beb1c8..6eab135 100644
--- a/src/AxiOmron.PcbCheck/appConfig.json
+++ b/src/AxiOmron.PcbCheck/appConfig.json
@@ -4,33 +4,34 @@
     "Port": 9600,
     "UnitAddress": 0,
     "SourceNodeAddress": 25,
+    "EndianFormat": "BADC",
     "PollIntervalMs": 200,
     "ConnectTimeoutMs": 3000,
     "ReleasePulseMs": 500,
     "ReleaseAckTimeoutMs": 2000,
     "Inputs": {
-      "PcbArrived": 1001,
-      "PlcReset": 1002,
-      "PlcAckRelease": 1003
+      "PcbArrived": 101,
+      "PlcReset": 102,
+      "PlcAckRelease": 103
     },
     "Outputs": {
-      "PcBusy": 1051,
-      "ReleasePermit": 1052
+      "PcBusy": 51,
+      "ReleasePermit": 52
     },
     "Registers": {
-      "ResultCode": 1100
+      "ResultCode": 401
     }
   },
   "Scanner": {
     "Scanner1": {
       "Name": "扫码枪1",
       "Host": "127.0.0.1",
-      "Port": 9001
+      "Port": 2001
     },
     "Scanner2": {
       "Name": "扫码枪2",
       "Host": "127.0.0.1",
-      "Port": 9002
+      "Port": 2001
     },
     "ConnectTimeoutMs": 3000,
     "ReadTimeoutMs": 3000,
@@ -39,7 +40,7 @@
     "TriggerInParallel": true
   },
   "FileCheck": {
-    "Provider": "Sftp",
+    "Provider": "Local",
     "FileNamePattern": "${barcode}.txt",
     "RetryIntervalSeconds": 2,
     "MaxRetryCount": 3,
@@ -61,7 +62,7 @@
     "ConnectTimeoutMs": 3000
   },
   "Andon": {
-    "Enable": true,
+    "Enable": false,
     "Url": "https://shp.prod.aliyun.mit.uaes.com/api/mit/MAE/Station/Status/alarm",
     "Method": "POST",
     "TimeoutMs": 3000,
@@ -88,4 +89,4 @@
     "AdminPassword": "AxiOmron@123",
     "AdminSessionTimeoutMinutes": 15
   }
-}
+}
\ No newline at end of file
diff --git a/tests/AxiOmron.PcbCheck.Tests/CsvBoardRecordRepositoryTests.cs b/tests/AxiOmron.PcbCheck.Tests/CsvBoardRecordRepositoryTests.cs
index 94a1a49..c109899 100644
--- a/tests/AxiOmron.PcbCheck.Tests/CsvBoardRecordRepositoryTests.cs
+++ b/tests/AxiOmron.PcbCheck.Tests/CsvBoardRecordRepositoryTests.cs
@@ -37,10 +37,10 @@ public sealed class CsvBoardRecordRepositoryTests : IDisposable
             timeProvider);
 
         await repository.AppendAsync(
-            CreateRecord("PCB-001", new DateTimeOffset(2026, 4, 19, 8, 0, 0, TimeSpan.FromHours(8)), (ushort)WorkflowResultCode.Passed),
+            CreateRecord("PCB-001", new DateTimeOffset(2026, 4, 19, 8, 0, 0, TimeSpan.FromHours(8)), (short)WorkflowResultCode.Passed),
             CancellationToken.None);
         await repository.AppendAsync(
-            CreateRecord("PCB-002", new DateTimeOffset(2026, 4, 19, 8, 5, 0, TimeSpan.FromHours(8)), (ushort)WorkflowResultCode.NgReleased),
+            CreateRecord("PCB-002", new DateTimeOffset(2026, 4, 19, 8, 5, 0, TimeSpan.FromHours(8)), (short)WorkflowResultCode.NgReleased),
             CancellationToken.None);
 
         BoardRecordLoadResult result = await repository.LoadCurrentDayAsync(CancellationToken.None);
@@ -100,7 +100,7 @@ public sealed class CsvBoardRecordRepositoryTests : IDisposable
             timeProvider);
 
         await repository.AppendAsync(
-            CreateRecord("PCB-OLD", new DateTimeOffset(2026, 4, 19, 23, 59, 55, TimeSpan.FromHours(8)), (ushort)WorkflowResultCode.Passed),
+            CreateRecord("PCB-OLD", new DateTimeOffset(2026, 4, 19, 23, 59, 55, TimeSpan.FromHours(8)), (short)WorkflowResultCode.Passed),
             CancellationToken.None);
 
         timeProvider.SetLocalNow(new DateTimeOffset(2026, 4, 20, 0, 0, 10, TimeSpan.FromHours(8)));
@@ -131,7 +131,7 @@ public sealed class CsvBoardRecordRepositoryTests : IDisposable
     /// <param name="completedAt">完成时间。</param>
     /// <param name="resultCode">结果代码。</param>
     /// <returns>测试记录。</returns>
-    private static BoardProcessRecord CreateRecord(string barcode, DateTimeOffset completedAt, ushort resultCode)
+    private static BoardProcessRecord CreateRecord(string barcode, DateTimeOffset completedAt, short resultCode)
     {
         return new BoardProcessRecord
         {
@@ -141,7 +141,7 @@ public sealed class CsvBoardRecordRepositoryTests : IDisposable
             ScanTryCount = 1,
             SftpTryCount = 1,
             ResultCode = resultCode,
-            ResultDescription = resultCode == (ushort)WorkflowResultCode.Passed ? "OK" : "NG",
+            ResultDescription = resultCode == (short)WorkflowResultCode.Passed ? "OK" : "NG",
             ReleaseSent = true,
             AlarmRaised = false,
             ExceptionSummary = string.Empty
diff --git a/tests/AxiOmron.PcbCheck.Tests/LocalFileCheckProviderTests.cs b/tests/AxiOmron.PcbCheck.Tests/LocalFileCheckProviderTests.cs
index 31bd8fa..4b7e972 100644
--- a/tests/AxiOmron.PcbCheck.Tests/LocalFileCheckProviderTests.cs
+++ b/tests/AxiOmron.PcbCheck.Tests/LocalFileCheckProviderTests.cs
@@ -89,20 +89,20 @@ public sealed class LocalFileCheckProviderTests : IDisposable
     }
 
     /// <summary>
-    /// 文件名包含条码时，应返回命中文件路径。
+    /// 文件名只包含条码但不等于模板生成文件名时，不应命中。
     /// </summary>
     /// <returns>异步测试任务。</returns>
     [Fact]
-    public async Task CheckFileAsync_ShouldMatchFileNameContainingBarcode()
+    public async Task CheckFileAsync_ShouldNotMatchFileNameContainingBarcodeOnly()
     {
-        string filePath = Path.Combine(_rootPath, "prefix-PCB-002-result.dat");
+        string filePath = Path.Combine(_rootPath, "abcd10.txt");
         await File.WriteAllTextAsync(filePath, "ok");
         var provider = CreateProvider();
 
-        FileCheckOutcome outcome = await provider.CheckFileAsync("PCB-002", CreateConfig(_rootPath), CancellationToken.None);
+        FileCheckOutcome outcome = await provider.CheckFileAsync("abcd1", CreateConfig(_rootPath), CancellationToken.None);
 
-        Assert.True(outcome.Exists);
-        Assert.Equal(filePath, outcome.MatchedFilePath);
+        Assert.False(outcome.Exists);
+        Assert.Empty(outcome.MatchedFilePath);
     }
 
     /// <summary>
diff --git a/tests/AxiOmron.PcbCheck.Tests/MainWindowViewModelTests.cs b/tests/AxiOmron.PcbCheck.Tests/MainWindowViewModelTests.cs
index 7c7b6f0..85eecdf 100644
--- a/tests/AxiOmron.PcbCheck.Tests/MainWindowViewModelTests.cs
+++ b/tests/AxiOmron.PcbCheck.Tests/MainWindowViewModelTests.cs
@@ -50,7 +50,7 @@ public sealed class MainWindowViewModelTests
                 Barcode = $"PCB-{index:D3}",
                 ScanTryCount = 1,
                 SftpTryCount = 1,
-                ResultCode = index % 2 == 0 ? (ushort)WorkflowResultCode.Passed : (ushort)WorkflowResultCode.NgReleased,
+                ResultCode = index % 2 == 0 ? (short)WorkflowResultCode.Passed : (short)WorkflowResultCode.NgReleased,
                 ResultDescription = index % 2 == 0 ? "OK" : "NG",
                 ReleaseSent = true,
                 AlarmRaised = false
@@ -131,10 +131,31 @@ public sealed class MainWindowViewModelTests
         }
     }
 
+    /// <summary>
+    /// 日志区域展开命令应只切换界面折叠状态，不影响运行数据。
+    /// </summary>
+    [Fact]
+    public void ToggleLogArea_ShouldSwitchExpandedState()
+    {
+        var stateStore = new AppStateStore();
+        var viewModel = CreateViewModel(stateStore);
+
+        Assert.False(viewModel.IsLogAreaExpanded);
+
+        viewModel.ToggleLogAreaCommand.Execute(null);
+
+        Assert.True(viewModel.IsLogAreaExpanded);
+
+        viewModel.ToggleLogAreaCommand.Execute(null);
+
+        Assert.False(viewModel.IsLogAreaExpanded);
+    }
+
     /// <summary>
     /// 创建测试用首页视图模型。
     /// </summary>
     /// <param name="stateStore">运行态存储。</param>
+    /// <param name="dispatcherService">可选的 UI 调度服务。</param>
     /// <returns>首页视图模型。</returns>
     private static MainWindowViewModel CreateViewModel(IAppStateStore stateStore, IDispatcherService? dispatcherService = null)
     {
diff --git a/tests/AxiOmron.PcbCheck.Tests/OmronFinsPlcServiceTests.cs b/tests/AxiOmron.PcbCheck.Tests/OmronFinsPlcServiceTests.cs
new file mode 100644
index 0000000..5016fc4
--- /dev/null
+++ b/tests/AxiOmron.PcbCheck.Tests/OmronFinsPlcServiceTests.cs
@@ -0,0 +1,41 @@
+using AxiOmron.PcbCheck.Options;
+using AxiOmron.PcbCheck.Services.Implementations;
+using IoTClient.Enums;
+using Xunit;
+
+namespace AxiOmron.PcbCheck.Tests;
+
+/// <summary>
+/// 验证欧姆龙 FINS PLC 服务的通信参数解析行为。
+/// </summary>
+public sealed class OmronFinsPlcServiceTests
+{
+    /// <summary>
+    /// 默认字节序应使用 BADC，以匹配现场 D 区 Int16 的高低字节顺序。
+    /// </summary>
+    [Fact]
+    public void ResolveEndianFormat_ShouldUseBadc_WhenConfigurationIsDefault()
+    {
+        var options = new PlcOptions();
+
+        EndianFormat result = OmronFinsPlcService.ResolveEndianFormat(options);
+
+        Assert.Equal(EndianFormat.BADC, result);
+    }
+
+    /// <summary>
+    /// 非法字节序配置应抛出明确异常，避免使用错误端序静默读写 PLC 寄存器。
+    /// </summary>
+    [Fact]
+    public void ResolveEndianFormat_ShouldThrow_WhenConfigurationIsInvalid()
+    {
+        var options = new PlcOptions
+        {
+            EndianFormat = "XYZ"
+        };
+
+        var exception = Assert.Throws<InvalidOperationException>(() => OmronFinsPlcService.ResolveEndianFormat(options));
+
+        Assert.Contains("PLC 字节序配置无效", exception.Message);
+    }
+}
diff --git a/tests/AxiOmron.PcbCheck.Tests/ResultCodeTypeTests.cs b/tests/AxiOmron.PcbCheck.Tests/ResultCodeTypeTests.cs
new file mode 100644
index 0000000..ca67826
--- /dev/null
+++ b/tests/AxiOmron.PcbCheck.Tests/ResultCodeTypeTests.cs
@@ -0,0 +1,33 @@
+using AxiOmron.PcbCheck.Models;
+using AxiOmron.PcbCheck.ViewModels;
+using Xunit;
+
+namespace AxiOmron.PcbCheck.Tests;
+
+/// <summary>
+/// 验证结果代码在模型与界面层统一使用 16 位有符号整数。
+/// </summary>
+public sealed class ResultCodeTypeTests
+{
+    /// <summary>
+    /// 结果代码枚举应以 Int16 作为底层类型，匹配 PLC 的 ResultCode 定义。
+    /// </summary>
+    [Fact]
+    public void WorkflowResultCode_ShouldUseInt16UnderlyingType()
+    {
+        Assert.Equal(typeof(short), Enum.GetUnderlyingType(typeof(WorkflowResultCode)));
+    }
+
+    /// <summary>
+    /// 结果代码属性应统一使用 Int16，避免经过界面或快照时被误建模为 UInt16 或 Int32。
+    /// </summary>
+    [Theory]
+    [InlineData(typeof(RuntimeSnapshot))]
+    [InlineData(typeof(PlcProcessState))]
+    [InlineData(typeof(BoardProcessRecord))]
+    [InlineData(typeof(MainWindowViewModel))]
+    public void ResultCodeProperties_ShouldUseInt16(Type ownerType)
+    {
+        Assert.Equal(typeof(short), ownerType.GetProperty("ResultCode")?.PropertyType);
+    }
+}
diff --git a/tests/AxiOmron.PcbCheck.Tests/SystemSettingViewModelTests.cs b/tests/AxiOmron.PcbCheck.Tests/SystemSettingViewModelTests.cs
index faf1810..b5f9746 100644
--- a/tests/AxiOmron.PcbCheck.Tests/SystemSettingViewModelTests.cs
+++ b/tests/AxiOmron.PcbCheck.Tests/SystemSettingViewModelTests.cs
@@ -34,7 +34,7 @@ public sealed class SystemSettingViewModelTests
                 StatusMessage = "SFTP 连接成功，根目录可访问。"
             }
         };
-        var viewModel = new SystemSettingViewModel(configService, fileCheckService, stateStore, dispatcherService);
+        var viewModel = new SystemSettingViewModel(configService, fileCheckService, stateStore, dispatcherService, new FakePlcService());
 
         await viewModel.TestFileCheckConnectionCommand.ExecuteAsync(null);
 
@@ -60,7 +60,7 @@ public sealed class SystemSettingViewModelTests
                 StatusMessage = "SFTP 连接失败: timeout"
             }
         };
-        var viewModel = new SystemSettingViewModel(configService, fileCheckService, stateStore, dispatcherService);
+        var viewModel = new SystemSettingViewModel(configService, fileCheckService, stateStore, dispatcherService, new FakePlcService());
 
         await viewModel.TestFileCheckConnectionCommand.ExecuteAsync(null);
 
@@ -87,7 +87,7 @@ public sealed class SystemSettingViewModelTests
             });
         });
 
-        var viewModel = new SystemSettingViewModel(configService, new FakeFileCheckService(), stateStore, dispatcherService);
+        var viewModel = new SystemSettingViewModel(configService, new FakeFileCheckService(), stateStore, dispatcherService, new FakePlcService());
 
         Assert.Single(viewModel.PlcMonitorItems);
         Assert.Equal("PcbArrived", viewModel.PlcMonitorItems[0].Name);
@@ -104,7 +104,7 @@ public sealed class SystemSettingViewModelTests
             var configService = new FakeAppConfigService();
             var stateStore = new AppStateStore();
             var dispatcherService = new CapturedDispatcherService(Dispatcher.CurrentDispatcher);
-            var viewModel = new SystemSettingViewModel(configService, new FakeFileCheckService(), stateStore, dispatcherService);
+            var viewModel = new SystemSettingViewModel(configService, new FakeFileCheckService(), stateStore, dispatcherService, new FakePlcService());
             _ = CollectionViewSource.GetDefaultView(viewModel.PlcMonitorItems);
 
             Exception? capturedException = null;
@@ -160,7 +160,8 @@ public sealed class SystemSettingViewModelTests
             configService,
             new FakeFileCheckService(),
             stateStore,
-            new CanceledDispatcherService());
+            new CanceledDispatcherService(),
+            new FakePlcService());
         var synchronizationContext = new ExceptionCapturingSynchronizationContext();
         SynchronizationContext? originalContext = SynchronizationContext.Current;
 
@@ -296,6 +297,37 @@ public sealed class SystemSettingViewModelTests
         }
     }
 
+    /// <summary>
+    /// 提供系统设置页测试用 PLC 服务替身。
+    /// </summary>
+    private sealed class FakePlcService : IPlcService
+    {
+        public Task<PlcSignalSnapshot> ReadSignalsAsync(CancellationToken cancellationToken)
+        {
+            return Task.FromResult(new PlcSignalSnapshot());
+        }
+
+        public Task<PlcMonitorSnapshot> ReadMonitorSnapshotAsync(CancellationToken cancellationToken)
+        {
+            return Task.FromResult(new PlcMonitorSnapshot());
+        }
+
+        public Task WriteStateAsync(PlcProcessState state, CancellationToken cancellationToken)
+        {
+            return Task.CompletedTask;
+        }
+
+        public Task ForceReconnectAsync(CancellationToken cancellationToken)
+        {
+            return Task.CompletedTask;
+        }
+
+        public Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken)
+        {
+            return Task.FromResult(PlcWriteResult.Success(address, type, value));
+        }
+    }
+
     /// <summary>
     /// 提供立即执行的测试用 Dispatcher，实现与设计时调度一致的同步行为。
     /// </summary>
diff --git a/tests/AxiOmron.PcbCheck.Tests/WorkflowHostedServiceTests.cs b/tests/AxiOmron.PcbCheck.Tests/WorkflowHostedServiceTests.cs
index 78c284d..e88a761 100644
--- a/tests/AxiOmron.PcbCheck.Tests/WorkflowHostedServiceTests.cs
+++ b/tests/AxiOmron.PcbCheck.Tests/WorkflowHostedServiceTests.cs
@@ -148,12 +148,12 @@ public sealed class WorkflowHostedServiceTests
 
         Assert.True(scannerService.TriggerCount > 0);
         Assert.Contains(plcService.WrittenStates, state => state.ReleasePermit);
-        Assert.Contains(plcService.WrittenStates, state => state.ResultCode == (ushort)WorkflowResultCode.Passed);
+        Assert.Contains(plcService.WrittenStates, state => state.ResultCode == (short)WorkflowResultCode.Passed);
 
         RuntimeSnapshot snapshot = stateStore.GetSnapshot();
         Assert.Contains(snapshot.PlcMonitorItems, item => item.Name == "PcbArrived" && item.CurrentValue == "False");
         Assert.Contains(snapshot.PlcMonitorItems, item => item.Name == "PcBusy" && item.CurrentValue == "False");
-        Assert.Contains(snapshot.PlcMonitorItems, item => item.Name == "ResultCode" && item.CurrentValue == ((ushort)WorkflowResultCode.Passed).ToString());
+        Assert.Contains(snapshot.PlcMonitorItems, item => item.Name == "ResultCode" && item.CurrentValue == ((short)WorkflowResultCode.Passed).ToString());
         Assert.All(snapshot.PlcMonitorItems, item => Assert.NotEqual(default, item.LastUpdatedAt));
     }
 
@@ -217,7 +217,7 @@ public sealed class WorkflowHostedServiceTests
 
         Assert.Equal(1, scannerService.TriggerCount);
         Assert.Equal("PCB-MERGED", fileCheckService.LastBarcode);
-        Assert.Contains(plcService.WrittenStates, state => state.ResultCode == (ushort)WorkflowResultCode.Passed);
+        Assert.Contains(plcService.WrittenStates, state => state.ResultCode == (short)WorkflowResultCode.Passed);
     }
 
     /// <summary>
@@ -304,7 +304,7 @@ public sealed class WorkflowHostedServiceTests
                         Barcode = "PCB-RESTORED",
                         ScanTryCount = 1,
                         SftpTryCount = 1,
-                        ResultCode = (ushort)WorkflowResultCode.Passed,
+                        ResultCode = (short)WorkflowResultCode.Passed,
                         ResultDescription = "OK",
                         ReleaseSent = true
                     }
@@ -409,7 +409,7 @@ public sealed class WorkflowHostedServiceTests
 
         RuntimeSnapshot snapshot = stateStore.GetSnapshot();
         Assert.NotEqual(WorkflowState.Faulted, snapshot.WorkflowState);
-        Assert.Equal((ushort)WorkflowResultCode.Passed, snapshot.ResultCode);
+        Assert.Equal((short)WorkflowResultCode.Passed, snapshot.ResultCode);
     }
 
     private sealed class FakePlcService : IPlcService
@@ -418,6 +418,7 @@ public sealed class WorkflowHostedServiceTests
         public Task<PlcMonitorSnapshot> ReadMonitorSnapshotAsync(CancellationToken cancellationToken) => Task.FromResult(new PlcMonitorSnapshot());
         public Task<PlcSignalSnapshot> ReadSignalsAsync(CancellationToken cancellationToken) => Task.FromResult(new PlcSignalSnapshot());
         public Task WriteStateAsync(PlcProcessState state, CancellationToken cancellationToken) => Task.CompletedTask;
+        public Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken) => Task.FromResult(PlcWriteResult.Success(address, type, value));
     }
 
     private sealed class ProbingPlcService : IPlcService
@@ -460,6 +461,11 @@ public sealed class WorkflowHostedServiceTests
         {
             return Task.CompletedTask;
         }
+
+        public Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken)
+        {
+            return Task.FromResult(PlcWriteResult.Success(address, type, value));
+        }
     }
 
     private sealed class FailingPlcService : IPlcService
@@ -483,6 +489,11 @@ public sealed class WorkflowHostedServiceTests
         {
             return Task.CompletedTask;
         }
+
+        public Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken)
+        {
+            throw new InvalidOperationException("PLC unreachable");
+        }
     }
 
     private sealed class SequencedPlcService : IPlcService
@@ -529,6 +540,11 @@ public sealed class WorkflowHostedServiceTests
             WrittenStates.Add(state.Clone());
             return Task.CompletedTask;
         }
+
+        public Task<PlcWriteResult> WriteRawValueAsync(string address, PlcWriteType type, string value, CancellationToken cancellationToken)
+        {
+            return Task.FromResult(PlcWriteResult.Success(address, type, value));
+        }
     }
 
     private sealed class FakeScannerService : IScannerService