diff --git a/Cardiopulmonarybypasssystems/EngineeringRegistersWindow.xaml b/Cardiopulmonarybypasssystems/EngineeringRegistersWindow.xaml
new file mode 100644
index 0000000..1d78eaa
--- /dev/null
+++ b/Cardiopulmonarybypasssystems/EngineeringRegistersWindow.xaml
@@ -0,0 +1,97 @@
+<Window x:Class="Cardiopulmonarybypasssystems.EngineeringRegistersWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="工程寄存器"
+        Width="920"
+        Height="640"
+        MinWidth="860"
+        MinHeight="560"
+        WindowStartupLocation="CenterOwner"
+        ResizeMode="CanResize"
+        ShowInTaskbar="False">
+    <Grid Margin="12">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="12" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+
+        <Border Padding="14" CornerRadius="16" Background="{StaticResource HeroBrush}">
+            <DockPanel LastChildFill="False">
+                <StackPanel DockPanel.Dock="Left">
+                    <Border Width="90"
+                            Height="24"
+                            Background="Transparent"
+                            HorizontalAlignment="Left"
+                            MouseLeftButtonDown="CloseHotspot_OnMouseLeftButtonDown"
+                            MouseLeftButtonUp="CloseHotspot_OnMouseLeftButtonUp"
+                            MouseLeave="CloseHotspot_OnMouseLeave" />
+                    <TextBlock FontSize="20" FontWeight="Bold" Foreground="White" Text="工程寄存器" />
+                    <TextBlock Margin="0,6,0,0"
+                               FontSize="12"
+                               Foreground="#EFFAFC"
+                               Text="长按左上角空白区可关闭弹窗。D1330 / D1380 为只读显示值；其余地址支持读写，写入后自动回读并刷新实时值。"
+                               TextWrapping="Wrap" />
+                </StackPanel>
+                <StackPanel DockPanel.Dock="Right" Orientation="Horizontal" VerticalAlignment="Center">
+                    <Button Padding="12,6"
+                            Command="{Binding RefreshEngineeringRegistersCommand}"
+                            Content="刷新寄存器"
+                            Background="#FFFFFFFF"
+                            Foreground="{StaticResource HeaderBrush}" />
+                </StackPanel>
+            </DockPanel>
+        </Border>
+
+        <Border Grid.Row="2" Style="{StaticResource CardBorderStyle}">
+            <DockPanel LastChildFill="True">
+                <TextBlock DockPanel.Dock="Top"
+                           Margin="0,0,0,10"
+                           FontSize="13"
+                           FontWeight="SemiBold"
+                           Text="{Binding EngineeringRegisterStatus}"
+                           TextWrapping="Wrap" />
+                <DataGrid ItemsSource="{Binding EngineeringRegisters}"
+                          AutoGenerateColumns="False"
+                          CanUserAddRows="False"
+                          CanUserDeleteRows="False"
+                          HeadersVisibility="Column"
+                          ScrollViewer.VerticalScrollBarVisibility="Auto"
+                          ScrollViewer.HorizontalScrollBarVisibility="Auto">
+                    <DataGrid.Columns>
+                        <DataGridTextColumn Header="名称" Binding="{Binding Name}" IsReadOnly="True" Width="180" />
+                        <DataGridTextColumn Header="地址" Binding="{Binding AddressDisplay}" IsReadOnly="True" Width="80" />
+                        <DataGridTextColumn Header="权限" Binding="{Binding AccessDisplay}" IsReadOnly="True" Width="80" />
+                        <DataGridTemplateColumn Header="当前值 / 写入值" Width="200">
+                            <DataGridTemplateColumn.CellTemplate>
+                                <DataTemplate>
+                                    <Grid>
+                                        <TextBox Text="{Binding PendingValue, UpdateSourceTrigger=PropertyChanged}"
+                                                 Visibility="{Binding EditVisibility}" />
+                                        <TextBlock VerticalAlignment="Center"
+                                                   Text="{Binding CurrentValue}"
+                                                   Visibility="{Binding ReadOnlyVisibility}" />
+                                    </Grid>
+                                </DataTemplate>
+                            </DataGridTemplateColumn.CellTemplate>
+                        </DataGridTemplateColumn>
+                        <DataGridTextColumn Header="PLC 当前值" Binding="{Binding CurrentValue}" IsReadOnly="True" Width="140" />
+                        <DataGridTextColumn Header="状态" Binding="{Binding StatusText}" IsReadOnly="True" Width="120" />
+                        <DataGridTemplateColumn Header="操作" Width="100">
+                            <DataGridTemplateColumn.CellTemplate>
+                                <DataTemplate>
+                                    <Button Padding="10,4"
+                                            Command="{Binding DataContext.WriteEngineeringRegisterCommand, RelativeSource={RelativeSource AncestorType=Window}}"
+                                            CommandParameter="{Binding}"
+                                            Content="写入"
+                                            Visibility="{Binding EditVisibility}"
+                                            Background="#FF4D8C72" />
+                                </DataTemplate>
+                            </DataGridTemplateColumn.CellTemplate>
+                        </DataGridTemplateColumn>
+                    </DataGrid.Columns>
+                </DataGrid>
+            </DockPanel>
+        </Border>
+    </Grid>
+</Window>
diff --git a/Cardiopulmonarybypasssystems/EngineeringRegistersWindow.xaml.cs b/Cardiopulmonarybypasssystems/EngineeringRegistersWindow.xaml.cs
new file mode 100644
index 0000000..cf06ec3
--- /dev/null
+++ b/Cardiopulmonarybypasssystems/EngineeringRegistersWindow.xaml.cs
@@ -0,0 +1,52 @@
+using System;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Threading;
+using Cardiopulmonarybypasssystems.ViewModels;
+
+namespace Cardiopulmonarybypasssystems;
+
+public partial class EngineeringRegistersWindow : Window
+{
+    private readonly DispatcherTimer _closeHoldTimer = new() { Interval = TimeSpan.FromMilliseconds(900) };
+
+    public EngineeringRegistersWindow(MainViewModel viewModel)
+    {
+        InitializeComponent();
+        DataContext = viewModel;
+        Loaded += OnLoaded;
+        _closeHoldTimer.Tick += CloseHoldTimer_OnTick;
+    }
+
+    private void OnLoaded(object sender, RoutedEventArgs e)
+    {
+        if (DataContext is MainViewModel viewModel
+            && viewModel.RefreshEngineeringRegistersCommand.CanExecute(null))
+        {
+            viewModel.RefreshEngineeringRegistersCommand.Execute(null);
+        }
+    }
+
+    private void CloseHotspot_OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+    {
+        _closeHoldTimer.Stop();
+        _closeHoldTimer.Start();
+    }
+
+    private void CloseHotspot_OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e) => _closeHoldTimer.Stop();
+
+    private void CloseHotspot_OnMouseLeave(object sender, MouseEventArgs e) => _closeHoldTimer.Stop();
+
+    private void CloseHoldTimer_OnTick(object? sender, EventArgs e)
+    {
+        _closeHoldTimer.Stop();
+        Close();
+    }
+
+    protected override void OnClosed(EventArgs e)
+    {
+        _closeHoldTimer.Stop();
+        _closeHoldTimer.Tick -= CloseHoldTimer_OnTick;
+        base.OnClosed(e);
+    }
+}
diff --git a/Cardiopulmonarybypasssystems/MainWindow.xaml b/Cardiopulmonarybypasssystems/MainWindow.xaml
index dbf5243..f55da12 100644
--- a/Cardiopulmonarybypasssystems/MainWindow.xaml
+++ b/Cardiopulmonarybypasssystems/MainWindow.xaml
@@ -21,7 +21,14 @@
             <RowDefinition Height="*" />
         </Grid.RowDefinitions>
 
-        <Border Grid.Row="0" Padding="12,10" CornerRadius="18" Background="{StaticResource HeroBrush}">
+        <Border Grid.Row="0"
+                Padding="12,10"
+                CornerRadius="18"
+                Background="{StaticResource HeroBrush}"
+                PreviewMouseLeftButtonDown="HeroHeader_OnPreviewMouseLeftButtonDown"
+                PreviewTouchDown="HeroHeader_OnPreviewTouchDown"
+                PreviewTouchUp="HeroHeader_OnPreviewTouchUp"
+                TouchLeave="HeroHeader_OnTouchLeave">
             <Border.Resources>
                 <Style x:Key="HeroCompactPillStyle" TargetType="Border" BasedOn="{StaticResource PillBorderStyle}">
                     <Setter Property="Padding" Value="10,5" />
@@ -109,7 +116,7 @@
 
         <Grid Grid.Row="2">
             <Border Style="{StaticResource CardBorderStyle}" Margin="0">
-                <TabControl>
+                <TabControl x:Name="RootTabControl">
                     <TabItem Header="项目检测">
                         <ScrollViewer Margin="0,6,0,0" VerticalScrollBarVisibility="Auto" CanContentScroll="False">
                             <StackPanel>
@@ -1416,6 +1423,84 @@
                         </ScrollViewer>
                     </TabItem>
 
+                    <TabItem x:Name="EngineeringRegistersTab"
+                             Header="工程寄存器"
+                             Visibility="{Binding EngineeringRegisterPanelVisibility}">
+                        <ScrollViewer VerticalScrollBarVisibility="Auto">
+                            <StackPanel Margin="0,6,0,0">
+                                <Border Style="{StaticResource CardBorderStyle}">
+                                    <StackPanel>
+                                        <DockPanel LastChildFill="False">
+                                            <TextBlock DockPanel.Dock="Left" Style="{StaticResource SectionTitleStyle}" Text="寄存器读写" />
+                                            <StackPanel DockPanel.Dock="Right" Orientation="Horizontal">
+                                                <Button Margin="0,0,8,0"
+                                                        Padding="12,6"
+                                                        Command="{Binding RefreshEngineeringRegistersCommand}"
+                                                        Content="刷新寄存器"
+                                                        Background="#FF4D8C72" />
+                                                <Button Padding="12,6"
+                                                        Command="{Binding ToggleEngineeringRegisterPanelCommand}"
+                                                        Content="隐藏界面"
+                                                        Background="#FF6B8791" />
+                                            </StackPanel>
+                                        </DockPanel>
+                                        <TextBlock Margin="0,8,0,0"
+                                                   Style="{StaticResource CaptionStyle}"
+                                                   Text="双击右上角可显示/隐藏此界面。D1330、D1380 为只读显示值；其余地址支持读写，写入后会立即回读刷新。"
+                                                   TextWrapping="Wrap" />
+                                        <TextBlock Margin="0,6,0,0"
+                                                   FontSize="13"
+                                                   FontWeight="SemiBold"
+                                                   Text="{Binding EngineeringRegisterStatus}"
+                                                   TextWrapping="Wrap" />
+                                    </StackPanel>
+                                </Border>
+
+                                <Border Style="{StaticResource CardBorderStyle}">
+                                    <DataGrid ItemsSource="{Binding EngineeringRegisters}"
+                                              AutoGenerateColumns="False"
+                                              CanUserAddRows="False"
+                                              CanUserDeleteRows="False"
+                                              HeadersVisibility="Column"
+                                              MinHeight="420">
+                                        <DataGrid.Columns>
+                                            <DataGridTextColumn Header="名称" Binding="{Binding Name}" IsReadOnly="True" Width="180" />
+                                            <DataGridTextColumn Header="地址" Binding="{Binding AddressDisplay}" IsReadOnly="True" Width="80" />
+                                            <DataGridTextColumn Header="权限" Binding="{Binding AccessDisplay}" IsReadOnly="True" Width="70" />
+                                            <DataGridTextColumn Header="当前值" Binding="{Binding CurrentValue}" IsReadOnly="True" Width="120" />
+                                            <DataGridTemplateColumn Header="写入值" Width="120">
+                                                <DataGridTemplateColumn.CellTemplate>
+                                                    <DataTemplate>
+                                                        <Grid>
+                                                            <TextBox Text="{Binding PendingValue, UpdateSourceTrigger=PropertyChanged}"
+                                                                     Visibility="{Binding EditVisibility}" />
+                                                            <TextBlock VerticalAlignment="Center"
+                                                                       Text="只读"
+                                                                       Visibility="{Binding ReadOnlyVisibility}" />
+                                                        </Grid>
+                                                    </DataTemplate>
+                                                </DataGridTemplateColumn.CellTemplate>
+                                            </DataGridTemplateColumn>
+                                            <DataGridTextColumn Header="状态" Binding="{Binding StatusText}" IsReadOnly="True" Width="120" />
+                                            <DataGridTemplateColumn Header="操作" Width="100">
+                                                <DataGridTemplateColumn.CellTemplate>
+                                                    <DataTemplate>
+                                                        <Button Padding="10,4"
+                                                                Command="{Binding DataContext.WriteEngineeringRegisterCommand, RelativeSource={RelativeSource AncestorType=Window}}"
+                                                                CommandParameter="{Binding}"
+                                                                Content="写入"
+                                                                Visibility="{Binding EditVisibility}"
+                                                                Background="#FF4D8C72" />
+                                                    </DataTemplate>
+                                                </DataGridTemplateColumn.CellTemplate>
+                                            </DataGridTemplateColumn>
+                                        </DataGrid.Columns>
+                                    </DataGrid>
+                                </Border>
+                            </StackPanel>
+                        </ScrollViewer>
+                    </TabItem>
+
                     <TabItem Header="追溯">
                         <ScrollViewer VerticalScrollBarVisibility="Auto">
                             <StackPanel Margin="0,6,0,0">
diff --git a/Cardiopulmonarybypasssystems/MainWindow.xaml.cs b/Cardiopulmonarybypasssystems/MainWindow.xaml.cs
index d4af820..eeb87e1 100644
--- a/Cardiopulmonarybypasssystems/MainWindow.xaml.cs
+++ b/Cardiopulmonarybypasssystems/MainWindow.xaml.cs
@@ -1,7 +1,10 @@
 using System.Globalization;
+using System.Windows.Threading;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
+using System.Windows.Input;
+using System.Windows.Media;
 using System.Windows.Shapes;
 using Cardiopulmonarybypasssystems.ViewModels;
 
@@ -9,11 +12,18 @@ namespace Cardiopulmonarybypasssystems;
 
 public partial class MainWindow : Window
 {
+    private const double EngineeringHotspotWidth = 220d;
+    private const double EngineeringHotspotHeight = 72d;
+    private EngineeringRegistersWindow? _engineeringRegistersWindow;
+    private readonly DispatcherTimer _engineeringTouchHoldTimer = new() { Interval = TimeSpan.FromMilliseconds(700) };
+    private DateTime _lastEngineeringTouchDownUtc = DateTime.MinValue;
+
     public MainWindow(MainViewModel viewModel)
     {
         InitializeComponent();
         DataContext = viewModel;
         ConfigureTrendBindings();
+        _engineeringTouchHoldTimer.Tick += EngineeringTouchHoldTimer_OnTick;
     }
 
     private void ConfigureTrendBindings()
@@ -48,4 +58,104 @@ public partial class MainWindow : Window
 
         BindingOperations.SetBinding(polyline, Polyline.PointsProperty, binding);
     }
+
+    private void HeroHeader_OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+    {
+        if (e.ClickCount != 2 || DataContext is not MainViewModel viewModel)
+        {
+            return;
+        }
+
+        if (!IsWithinEngineeringHotspot(sender as IInputElement, e.GetPosition(sender as IInputElement)))
+        {
+            return;
+        }
+
+        ToggleEngineeringWindow(viewModel);
+        e.Handled = true;
+    }
+
+    private void HeroHeader_OnPreviewTouchDown(object sender, TouchEventArgs e)
+    {
+        if (DataContext is not MainViewModel viewModel)
+        {
+            return;
+        }
+
+        var source = sender as IInputElement;
+        var position = e.GetTouchPoint(source).Position;
+        if (!IsWithinEngineeringHotspot(source, position))
+        {
+            _engineeringTouchHoldTimer.Stop();
+            return;
+        }
+
+        var now = DateTime.UtcNow;
+        if ((now - _lastEngineeringTouchDownUtc).TotalMilliseconds <= 500)
+        {
+            _engineeringTouchHoldTimer.Stop();
+            ToggleEngineeringWindow(viewModel);
+            _lastEngineeringTouchDownUtc = DateTime.MinValue;
+            e.Handled = true;
+            return;
+        }
+
+        _lastEngineeringTouchDownUtc = now;
+        _engineeringTouchHoldTimer.Stop();
+        _engineeringTouchHoldTimer.Start();
+        e.Handled = true;
+    }
+
+    private void HeroHeader_OnPreviewTouchUp(object sender, TouchEventArgs e)
+    {
+        _engineeringTouchHoldTimer.Stop();
+        e.Handled = true;
+    }
+
+    private void HeroHeader_OnTouchLeave(object sender, TouchEventArgs e)
+    {
+        _engineeringTouchHoldTimer.Stop();
+        e.Handled = true;
+    }
+
+    private void EngineeringTouchHoldTimer_OnTick(object? sender, EventArgs e)
+    {
+        _engineeringTouchHoldTimer.Stop();
+
+        if (DataContext is MainViewModel viewModel)
+        {
+            ToggleEngineeringWindow(viewModel);
+        }
+    }
+
+    private void ToggleEngineeringWindow(MainViewModel viewModel)
+    {
+        if (_engineeringRegistersWindow is not null)
+        {
+            _engineeringRegistersWindow.Close();
+            _engineeringRegistersWindow = null;
+            return;
+        }
+
+        if (viewModel.RefreshEngineeringRegistersCommand.CanExecute(null))
+        {
+            viewModel.RefreshEngineeringRegistersCommand.Execute(null);
+        }
+
+        _engineeringRegistersWindow = new EngineeringRegistersWindow(viewModel)
+        {
+            Owner = this
+        };
+        _engineeringRegistersWindow.Closed += (_, _) => _engineeringRegistersWindow = null;
+        _engineeringRegistersWindow.Show();
+    }
+
+    private static bool IsWithinEngineeringHotspot(IInputElement? source, Point position)
+    {
+        _ = source;
+        return position.X >= 0d
+            && position.Y >= 0d
+            && position.X <= EngineeringHotspotWidth
+            && position.Y <= EngineeringHotspotHeight;
+    }
 }
diff --git a/Cardiopulmonarybypasssystems/Models/EngineeringRegisterItem.cs b/Cardiopulmonarybypasssystems/Models/EngineeringRegisterItem.cs
new file mode 100644
index 0000000..8e1b52b
--- /dev/null
+++ b/Cardiopulmonarybypasssystems/Models/EngineeringRegisterItem.cs
@@ -0,0 +1,29 @@
+using System.Windows;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Cardiopulmonarybypasssystems.Models;
+
+public partial class EngineeringRegisterItem : ObservableObject
+{
+    public required string Name { get; init; }
+    public required ushort Address { get; init; }
+    public required bool IsWritable { get; init; }
+    public bool UsesFloatDisplay { get; init; }
+    public bool UsesFloatRegister { get; init; }
+    public string ValueSuffix { get; init; } = string.Empty;
+    public string DisplayFormat { get; init; } = "F2";
+    public string AddressDisplay => $"D{Address}";
+    public string AccessDisplay => IsWritable ? "读/写" : "只读";
+    public bool IsFloatRegisterAddress => UsesFloatRegister || UsesFloatDisplay || Address is 1006 or 1016 or 1026 or 1036 or 1046 or 1056 or 1066 or 1076 or 1328 or 1378 or 1330 or 1380;
+    public Visibility EditVisibility => IsWritable ? Visibility.Visible : Visibility.Collapsed;
+    public Visibility ReadOnlyVisibility => IsWritable ? Visibility.Collapsed : Visibility.Visible;
+
+    [ObservableProperty]
+    private string currentValue = "--";
+
+    [ObservableProperty]
+    private string pendingValue = string.Empty;
+
+    [ObservableProperty]
+    private string statusText = string.Empty;
+}
diff --git a/Cardiopulmonarybypasssystems/Services/IModbusTelemetryService.cs b/Cardiopulmonarybypasssystems/Services/IModbusTelemetryService.cs
index 3523281..e0dc1bc 100644
--- a/Cardiopulmonarybypasssystems/Services/IModbusTelemetryService.cs
+++ b/Cardiopulmonarybypasssystems/Services/IModbusTelemetryService.cs
@@ -12,6 +12,10 @@ public interface IModbusTelemetryService
     IReadOnlyList<PumpControlChannel> GetPumpControls();
     IReadOnlyList<ValveControlChannel> GetValveControls();
     TelemetryUpdateSnapshot UpdateChannels();
+    ushort? ReadHoldingRegister(ushort address);
+    float? ReadHoldingFloatRegister(ushort address);
+    bool WriteHoldingRegister(ushort address, ushort value);
+    bool WriteHoldingFloatRegister(ushort address, float value);
     void SetPumpRunning(string pumpKey, bool isRunning);
     void SetValveOpen(string valveKey, bool isOpen);
 }
diff --git a/Cardiopulmonarybypasssystems/Services/MockModbusTelemetryService.cs b/Cardiopulmonarybypasssystems/Services/MockModbusTelemetryService.cs
index 30d7b9d..72d975c 100644
--- a/Cardiopulmonarybypasssystems/Services/MockModbusTelemetryService.cs
+++ b/Cardiopulmonarybypasssystems/Services/MockModbusTelemetryService.cs
@@ -48,6 +48,19 @@ public sealed class MockModbusTelemetryService : IModbusTelemetryService, IDispo
     private readonly Random _random = new();
     private readonly ModbusFactory _factory = new();
     private readonly Dictionary<string, Queue<double>> _channelWindows = new(StringComparer.Ordinal);
+    private readonly Dictionary<ushort, float> _engineeringFloatRegisters = new()
+    {
+        [1006] = 1.0f,
+        [1016] = 1.0f,
+        [1026] = 1.0f,
+        [1036] = 1.0f,
+        [1046] = 1.0f,
+        [1056] = 1.0f,
+        [1066] = 1.0f,
+        [1076] = 1.0f,
+        [1328] = 1.0f,
+        [1378] = 1.0f
+    };
     private readonly List<DeviceChannel> _channels =
     [
         new() { Name = "主泵流量", Unit = "L/min", Value = 0, Min = 0, Max = 7 },
@@ -145,6 +158,61 @@ public sealed class MockModbusTelemetryService : IModbusTelemetryService, IDispo
         }
     }
 
+    public ushort? ReadHoldingRegister(ushort address)
+    {
+        lock (_syncRoot)
+        {
+            if (!_engineeringFloatRegisters.TryGetValue(address, out var value))
+            {
+                return null;
+            }
+
+            return (ushort)Math.Clamp((int)Math.Round(value), ushort.MinValue, ushort.MaxValue);
+        }
+    }
+
+    public float? ReadHoldingFloatRegister(ushort address)
+    {
+        lock (_syncRoot)
+        {
+            return address switch
+            {
+                ProximalPressureRegister => (float)(_proximalPressureRawKpa ?? (_channels.First(channel => channel.Name == "近端压力").Value / KpaToMmHg)),
+                DistalPressureRegister => (float)(_distalPressureRawKpa ?? (_channels.First(channel => channel.Name == "远端压力").Value / KpaToMmHg)),
+                _ when _engineeringFloatRegisters.TryGetValue(address, out var value) => value,
+                _ => null
+            };
+        }
+    }
+
+    public bool WriteHoldingRegister(ushort address, ushort value)
+    {
+        lock (_syncRoot)
+        {
+            if (!_engineeringFloatRegisters.ContainsKey(address))
+            {
+                return false;
+            }
+
+            _engineeringFloatRegisters[address] = value;
+            return true;
+        }
+    }
+
+    public bool WriteHoldingFloatRegister(ushort address, float value)
+    {
+        lock (_syncRoot)
+        {
+            if (!_engineeringFloatRegisters.ContainsKey(address))
+            {
+                return false;
+            }
+
+            _engineeringFloatRegisters[address] = value;
+            return true;
+        }
+    }
+
     public void SetPumpRunning(string pumpKey, bool isRunning)
     {
         lock (_syncRoot)
diff --git a/Cardiopulmonarybypasssystems/Services/ModbusTelemetryService.cs b/Cardiopulmonarybypasssystems/Services/ModbusTelemetryService.cs
index 9c12703..ef2ab6e 100644
--- a/Cardiopulmonarybypasssystems/Services/ModbusTelemetryService.cs
+++ b/Cardiopulmonarybypasssystems/Services/ModbusTelemetryService.cs
@@ -182,6 +182,106 @@ public sealed class ModbusTelemetryService : IModbusTelemetryService, IDisposabl
         }
     }
 
+    public ushort? ReadHoldingRegister(ushort address)
+    {
+        EnsureConnectionReadyForDirectAccess();
+
+        lock (_syncRoot)
+        {
+            if (_master is null)
+            {
+                return null;
+            }
+
+            try
+            {
+                return _master.ReadHoldingRegisters(_slaveId, address, 1)[0];
+            }
+            catch (Exception ex)
+            {
+                HandleConnectionFailure($"读取寄存器 D{address} 失败：{ex.Message}");
+                return null;
+            }
+        }
+    }
+
+    public float? ReadHoldingFloatRegister(ushort address)
+    {
+        EnsureConnectionReadyForDirectAccess();
+
+        lock (_syncRoot)
+        {
+            if (_master is null)
+            {
+                return null;
+            }
+
+            try
+            {
+                var registers = _master.ReadHoldingRegisters(_slaveId, address, 2);
+                return address is ProximalPressureRegister or DistalPressureRegister
+                    ? (float)ConvertRegistersToPressureKpa(registers[0], registers[1])
+                    : DecodeFloat(registers[0], registers[1], lowWordFirst: true);
+            }
+            catch (Exception ex)
+            {
+                HandleConnectionFailure($"读取浮点寄存器 D{address} 失败：{ex.Message}");
+                return null;
+            }
+        }
+    }
+
+    public bool WriteHoldingRegister(ushort address, ushort value)
+    {
+        EnsureConnectionReadyForDirectAccess();
+
+        lock (_syncRoot)
+        {
+            if (_master is null)
+            {
+                _lastErrorMessage = $"PLC 离线，未执行寄存器写入：D{address}";
+                return false;
+            }
+
+            try
+            {
+                _master.WriteSingleRegister(_slaveId, address, value);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                HandleConnectionFailure($"写入寄存器 D{address} 失败：{ex.Message}");
+                return false;
+            }
+        }
+    }
+
+    public bool WriteHoldingFloatRegister(ushort address, float value)
+    {
+        EnsureConnectionReadyForDirectAccess();
+
+        lock (_syncRoot)
+        {
+            if (_master is null)
+            {
+                _lastErrorMessage = $"PLC 离线，未执行浮点寄存器写入：D{address}";
+                return false;
+            }
+
+            try
+            {
+                var registers = EncodeFloat(value, lowWordFirst: true);
+                _master.WriteMultipleRegisters(_slaveId, address, registers);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                HandleConnectionFailure($"写入浮点寄存器 D{address} 失败：{ex.Message}");
+                return false;
+            }
+        }
+    }
+
     public void SetPumpRunning(string pumpKey, bool isRunning)
     {
         lock (_syncRoot)
@@ -272,6 +372,36 @@ public sealed class ModbusTelemetryService : IModbusTelemetryService, IDisposabl
         }
     }
 
+    private void EnsureConnectionReadyForDirectAccess()
+    {
+        EnsureConnectionScheduled();
+
+        Task? connectionTask;
+        lock (_syncRoot)
+        {
+            if (_master is not null && _tcpClient?.Connected == true)
+            {
+                return;
+            }
+
+            connectionTask = _connectionTask;
+        }
+
+        if (connectionTask is null)
+        {
+            return;
+        }
+
+        try
+        {
+            connectionTask.Wait(ConnectionAttemptTimeout + TimeSpan.FromMilliseconds(300));
+        }
+        catch
+        {
+            // Read/write callers handle the offline state after the wait.
+        }
+    }
+
     private void ConnectWithTimeout()
     {
         TcpClient? tcpClient = null;
@@ -623,6 +753,16 @@ public sealed class ModbusTelemetryService : IModbusTelemetryService, IDisposabl
         return BitConverter.Int32BitsToSingle(unchecked((int)bits));
     }
 
+    private static ushort[] EncodeFloat(float value, bool lowWordFirst)
+    {
+        var bits = unchecked((uint)BitConverter.SingleToInt32Bits(value));
+        var lowWord = (ushort)(bits & 0xFFFF);
+        var highWord = (ushort)((bits >> 16) & 0xFFFF);
+        return lowWordFirst
+            ? [lowWord, highWord]
+            : [highWord, lowWord];
+    }
+
     private static bool IsPlausiblePressureKpa(float value) =>
         !float.IsNaN(value) && !float.IsInfinity(value) && value is > -1000f and < 1000f;
 
diff --git a/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.cs b/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.cs
index 73cdf3b..07173aa 100644
--- a/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.cs
+++ b/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.cs
@@ -1,5 +1,6 @@
 using System.Collections.ObjectModel;
 using System.ComponentModel;
+using System.Globalization;
 using System.IO;
 using System.Text.Json;
 using System.Threading.Tasks;
@@ -46,6 +47,12 @@ public partial class MainViewModel : ObservableObject, IDisposable
     private double? _proximalPressureRawKpa;
     private double? _distalPressureRawKpa;
 
+    [ObservableProperty]
+    private bool engineeringRegisterPanelVisible;
+
+    [ObservableProperty]
+    private string engineeringRegisterStatus = "双击右上角显示工程寄存器界面";
+
     [ObservableProperty]
     private string pageTitle = "心肺转流系统一次性使用动静脉插管检测";
 
@@ -161,6 +168,7 @@ public partial class MainViewModel : ObservableObject, IDisposable
         TraceEvents = new ObservableCollection<TraceEvent>(repository.GetInitialTraceEvents());
         AlarmMessages = new ObservableCollection<AlarmMessage>();
         ResultStatusOptions = new ObservableCollection<string>(["待检", "合格", "预警", "不合格"]);
+        EngineeringRegisters = BuildEngineeringRegisters();
         PressureDropEntries = new ObservableCollection<PressureDropPointEntry>(
         [
             new() { Label = "50%", TargetFlow = 3.0 },
@@ -249,6 +257,7 @@ public partial class MainViewModel : ObservableObject, IDisposable
     public ObservableCollection<TraceEvent> TraceEvents { get; }
     public ObservableCollection<AlarmMessage> AlarmMessages { get; }
     public ObservableCollection<string> ResultStatusOptions { get; }
+    public ObservableCollection<EngineeringRegisterItem> EngineeringRegisters { get; }
     public ObservableCollection<PressureDropPointEntry> PressureDropEntries { get; }
     public ObservableCollection<KinkResistancePointEntry> KinkResistanceEntries { get; }
     public ObservableCollection<RecirculationPointEntry> RecirculationEntries { get; }
@@ -270,6 +279,7 @@ public partial class MainViewModel : ObservableObject, IDisposable
     public ObservableCollection<string> HemolysisAnticoagulantOptions { get; } = new(["肝素", "枸橼酸钠", "其他"]);
     public bool HasFilteredItems => !FilteredItemsView.IsEmpty;
     public bool HasSelectedItem => SelectedItem is not null;
+    public Visibility EngineeringRegisterPanelVisibility => EngineeringRegisterPanelVisible ? Visibility.Visible : Visibility.Collapsed;
     public IEnumerable<DeviceChannel> FlowSensorChannels => Channels.Where(IsFlowSensorChannel);
     public IEnumerable<DeviceChannel> OtherChannels => Channels.Where(channel => !IsFlowSensorChannel(channel));
     public bool IsTelemetryOnline => _isTelemetryOnline;
@@ -480,6 +490,7 @@ public partial class MainViewModel : ObservableObject, IDisposable
     partial void OnPressureDropLimit100Changed(double value) => UpdateAndPersistLimitSettings();
     partial void OnAntiCollapseAllowedIncreaseRateChanged(double value) => UpdateAndPersistLimitSettings();
     partial void OnRecirculationAllowedLimitChanged(double value) => UpdateAndPersistLimitSettings();
+    partial void OnEngineeringRegisterPanelVisibleChanged(bool value) => OnPropertyChanged(nameof(EngineeringRegisterPanelVisibility));
     partial void OnItemSearchTextChanged(string value)
     {
         RefreshFilteredItemsView();
@@ -659,6 +670,93 @@ public partial class MainViewModel : ObservableObject, IDisposable
         RaiseTrendPropertyChanges();
     }
 
+    [RelayCommand]
+    private void ToggleEngineeringRegisterPanel()
+    {
+        EngineeringRegisterPanelVisible = !EngineeringRegisterPanelVisible;
+        EngineeringRegisterStatus = EngineeringRegisterPanelVisible
+            ? "工程寄存器界面已显示"
+            : "工程寄存器界面已隐藏";
+
+        if (EngineeringRegisterPanelVisible)
+        {
+            RefreshEngineeringRegisters();
+        }
+    }
+
+    [RelayCommand]
+    private void RefreshEngineeringRegisters()
+    {
+        var refreshedCount = 0;
+
+        foreach (var item in EngineeringRegisters)
+        {
+            if (RefreshEngineeringRegisterItem(item))
+            {
+                refreshedCount++;
+            }
+        }
+
+        EngineeringRegisterStatus = refreshedCount == EngineeringRegisters.Count
+            ? $"已刷新 {refreshedCount} 个寄存器地址"
+            : $"已刷新 {refreshedCount}/{EngineeringRegisters.Count} 个寄存器地址";
+    }
+
+    [RelayCommand]
+    private void WriteEngineeringRegister(EngineeringRegisterItem? item)
+    {
+        if (item is null || !item.IsWritable)
+        {
+            return;
+        }
+
+        if (item.IsFloatRegisterAddress)
+        {
+            if (!float.TryParse(item.PendingValue, NumberStyles.Float | NumberStyles.AllowThousands, CultureInfo.InvariantCulture, out var floatParsed))
+            {
+                item.StatusText = "请输入浮点数";
+                EngineeringRegisterStatus = $"{item.AddressDisplay} 输入格式无效";
+                return;
+            }
+
+            if (!_telemetryService.WriteHoldingFloatRegister(item.Address, floatParsed))
+            {
+                item.StatusText = "写入失败";
+                EngineeringRegisterStatus = $"{item.AddressDisplay} 写入失败";
+                return;
+            }
+
+            RefreshEngineeringRegisters();
+            item.StatusText = "写入成功";
+            EngineeringRegisterStatus = $"{item.AddressDisplay} 已写入 {floatParsed.ToString("F4", CultureInfo.InvariantCulture)}";
+            LatestAction = $"{item.Name} 已写入寄存器 {item.AddressDisplay} = {floatParsed.ToString("F4", CultureInfo.InvariantCulture)}";
+            TraceEvents.Insert(0, NewTrace("工程寄存器写入", $"{item.Name} / {item.AddressDisplay} = {floatParsed.ToString("F4", CultureInfo.InvariantCulture)}"));
+            _ = RefreshTelemetryAsync();
+            return;
+        }
+
+        if (!ushort.TryParse(item.PendingValue, NumberStyles.Integer, CultureInfo.InvariantCulture, out var parsed))
+        {
+            item.StatusText = "请输入 0-65535 的整数";
+            EngineeringRegisterStatus = $"{item.AddressDisplay} 输入格式无效";
+            return;
+        }
+
+        if (!_telemetryService.WriteHoldingRegister(item.Address, parsed))
+        {
+            item.StatusText = "写入失败";
+            EngineeringRegisterStatus = $"{item.AddressDisplay} 写入失败";
+            return;
+        }
+
+        RefreshEngineeringRegisters();
+        item.StatusText = "写入成功";
+        EngineeringRegisterStatus = $"{item.AddressDisplay} 已写入 {parsed}";
+        LatestAction = $"{item.Name} 已写入寄存器 {item.AddressDisplay} = {parsed}";
+        TraceEvents.Insert(0, NewTrace("工程寄存器写入", $"{item.Name} / {item.AddressDisplay} = {parsed}"));
+        _ = RefreshTelemetryAsync();
+    }
+
     [RelayCommand]
     private void CapturePressureDrop50() => CapturePressureDropSample("50%");
 
@@ -1607,6 +1705,61 @@ public partial class MainViewModel : ObservableObject, IDisposable
         _ => $"主泵 {PressureDropPumpFlowDisplay} / 流量偏差 {FlowImbalanceDisplay}"
     };
 
+    private ObservableCollection<EngineeringRegisterItem> BuildEngineeringRegisters() =>
+    [
+        CreateEngineeringRegister("流量系数 1", 1006, true),
+        CreateEngineeringRegister("流量系数 2", 1016, true),
+        CreateEngineeringRegister("流量系数 3", 1026, true),
+        CreateEngineeringRegister("流量系数 4", 1036, true),
+        CreateEngineeringRegister("流量系数 5", 1046, true),
+        CreateEngineeringRegister("流量系数 6", 1056, true),
+        CreateEngineeringRegister("流量系数 7", 1066, true),
+        CreateEngineeringRegister("流量系数 8", 1076, true),
+        CreateEngineeringRegister("近端压力系数", 1328, true),
+        CreateEngineeringRegister("远端压力系数", 1378, true),
+        CreateEngineeringRegister("近端压力显示", 1330, false, usesFloatDisplay: true),
+        CreateEngineeringRegister("远端压力显示", 1380, false, usesFloatDisplay: true)
+    ];
+
+    private static EngineeringRegisterItem CreateEngineeringRegister(string name, ushort address, bool isWritable, bool usesFloatDisplay = false) =>
+        new()
+        {
+            Name = name,
+            Address = address,
+            IsWritable = isWritable,
+            UsesFloatDisplay = usesFloatDisplay,
+            StatusText = isWritable ? "可读写" : "只读显示"
+        };
+
+    private bool RefreshEngineeringRegisterItem(EngineeringRegisterItem item)
+    {
+        if (item.IsFloatRegisterAddress)
+        {
+            var floatValue = _telemetryService.ReadHoldingFloatRegister(item.Address);
+            item.CurrentValue = floatValue.HasValue
+                ? item.Address is 1330 or 1380
+                    ? $"{floatValue.Value:F2} kPa"
+                    : floatValue.Value.ToString("F4", CultureInfo.InvariantCulture)
+                : "--";
+            if (item.IsWritable && floatValue.HasValue)
+            {
+                item.PendingValue = floatValue.Value.ToString("F4", CultureInfo.InvariantCulture);
+            }
+            item.StatusText = floatValue.HasValue ? "读取成功" : "读取失败";
+            return floatValue.HasValue;
+        }
+
+        var registerValue = _telemetryService.ReadHoldingRegister(item.Address);
+        item.CurrentValue = registerValue.HasValue
+            ? registerValue.Value.ToString(CultureInfo.InvariantCulture)
+            : "--";
+        item.PendingValue = registerValue.HasValue
+            ? registerValue.Value.ToString(CultureInfo.InvariantCulture)
+            : item.PendingValue;
+        item.StatusText = registerValue.HasValue ? "读取成功" : "读取失败";
+        return registerValue.HasValue;
+    }
+
     private string PressureDisplay(string channelName, double? rawKpa)
     {
         if (rawKpa.HasValue)