diff --git a/Views/SettingsWindow.xaml b/Views/SettingsWindow.xaml
index 713b09e..140a2f2 100644
--- a/Views/SettingsWindow.xaml
+++ b/Views/SettingsWindow.xaml
@@ -91,6 +91,10 @@
                                 <TextBlock Text="加压压力:" Style="{StaticResource ParamLabel}"/>
                                 <TextBox x:Name="HardnessPressureBox"/>
                             </StackPanel>
+                            <StackPanel Style="{StaticResource ParamRow}">
+                                <TextBlock Text="硬度破损判定(N):" Style="{StaticResource ParamLabel}"/>
+                                <TextBox x:Name="HardnessDamageThresholdBox" helpers:NumericInput.AllowDecimal="False"/>
+                            </StackPanel>
                         </WrapPanel>
                         <TextBlock Text="硬度没有统一药典数值限度，此处作为企业内控范围和本机测试次数。"
                                    Style="{StaticResource StandardNote}"/>
diff --git a/Views/SettingsWindow.xaml.cs b/Views/SettingsWindow.xaml.cs
index c84562e..1a8a500 100644
--- a/Views/SettingsWindow.xaml.cs
+++ b/Views/SettingsWindow.xaml.cs
@@ -19,6 +19,7 @@ namespace TabletTester2025
         private async void SettingsWindow_Loaded(object sender, RoutedEventArgs e)
         {
             await LoadHardnessPressureAsync();
+            await LoadHardnessDamageThresholdAsync();
         }
 
         private void LoadSettings()
@@ -56,6 +57,7 @@ namespace TabletTester2025
                 p.HardnessMax_N = ParseFiniteDouble(HardnessMaxBox.Text, "硬度内控上限");
                 p.HardnessTestCount = int.Parse(HardnessCountBox.Text);
                 double hardnessPressure = ParseFiniteDouble(HardnessPressureBox.Text, "加压压力");
+                int hardnessDamageThreshold = ParsePositiveInt(HardnessDamageThresholdBox.Text, "硬度破损判定");
                 p.FriabilityTargetRpm = ParseFiniteDouble(FriabilityRpmBox.Text, "脆碎度转速");
                 p.FriabilityTargetTimeMin = ParseFiniteDouble(FriabilityTimeBox.Text, "脆碎度试验时间");
                 p.FriabilityTargetRounds = ParsePositiveInt(FriabilityRoundsBox.Text, "脆碎圈数");
@@ -77,6 +79,7 @@ namespace TabletTester2025
 
                 ValidateParameters(p);
                 await WriteHardnessPressureAsync(hardnessPressure);
+                await WriteHardnessDamageThresholdAsync(hardnessDamageThreshold);
                 App.CurrentPharmaParams = p;
                 App.SaveCurrentPharmaParameters();
 
@@ -204,6 +207,38 @@ namespace TabletTester2025
             return App.PlcConfig.HardnessPressure != 0 ? App.PlcConfig.HardnessPressure : (ushort)1480;
         }
 
+        private async Task LoadHardnessDamageThresholdAsync()
+        {
+            ushort registerAddress = ResolveHardnessDamageThresholdRegister();
+            if (registerAddress == 0)
+                return;
+
+            try
+            {
+                int value = await App.PlcService.ReadIntAsync(registerAddress);
+                if (value >= 0)
+                    HardnessDamageThresholdBox.Text = value.ToString();
+            }
+            catch
+            {
+                HardnessDamageThresholdBox.Text = "";
+            }
+        }
+
+        private static async Task WriteHardnessDamageThresholdAsync(int value)
+        {
+            ushort registerAddress = ResolveHardnessDamageThresholdRegister();
+            if (registerAddress == 0)
+                throw new InvalidOperationException("硬度破损判定PLC寄存器地址未配置。");
+
+            await App.PlcService.WriteRegisterAsync(registerAddress, (ushort)Math.Clamp(value, 0, ushort.MaxValue));
+        }
+
+        private static ushort ResolveHardnessDamageThresholdRegister()
+        {
+            return App.PlcConfig.HardnessPoSun != 0 ? App.PlcConfig.HardnessPoSun : (ushort)400;
+        }
+
         private static double ResolveFriabilityTargetTimeMin(PharmaParameters p)
         {
             if (p.FriabilityTargetTimeMin > 0)