diff --git a/src/CncModels/Dto/Machine/MachineStatusResponse.cs b/src/CncModels/Dto/Machine/MachineStatusResponse.cs
index 8e45eb2..2572f6e 100644
--- a/src/CncModels/Dto/Machine/MachineStatusResponse.cs
+++ b/src/CncModels/Dto/Machine/MachineStatusResponse.cs
@@ -28,5 +28,8 @@ namespace CncModels.Dto.Machine
 
         /// <summary>主轴负载（%）</summary>
         public decimal? SpindleLoad { get; set; }
+
+        /// <summary>历史累计加工零件总数（Tag1终身值）</summary>
+        public decimal? TotalPartCount { get; set; }
     }
 }
diff --git a/src/CncModels/Entity/Machine.cs b/src/CncModels/Entity/Machine.cs
index 384425f..983b738 100644
--- a/src/CncModels/Entity/Machine.cs
+++ b/src/CncModels/Entity/Machine.cs
@@ -52,6 +52,9 @@ namespace CncModels.Entity
         /// <summary>最近零件数</summary>
         public decimal? LastPartCount { get; set; }
 
+        /// <summary>最近累计零件总数（Tag1历史终身值）</summary>
+        public decimal? LastTotalPartCount { get; set; }
+
         /// <summary>最近操作模式</summary>
         public string LastOperateMode { get; set; }
 
diff --git a/src/CncRepository/Impl/MachineRepository.cs b/src/CncRepository/Impl/MachineRepository.cs
index 0ff4846..864ef28 100644
--- a/src/CncRepository/Impl/MachineRepository.cs
+++ b/src/CncRepository/Impl/MachineRepository.cs
@@ -20,7 +20,7 @@ namespace CncRepository.Impl
         /// <summary>在线判断SQL片段：last_ping_time在20秒内视为在线</summary>
         private const string OnlineExpr = "(CASE WHEN last_ping_time IS NOT NULL AND last_ping_time >= NOW() - INTERVAL 20 SECOND THEN 1 ELSE 0 END)";
 
-        private const string SelectColumns = @"id as Id, device_code as DeviceCode, name as Name, workshop_id as WorkshopId, collect_address_id as CollectAddressId, ip_address as IpAddress, brand_id as BrandId, is_enabled as IsEnabled, {0} as IsOnline, last_ping_time as LastPingTime, last_ping_latency as LastPingLatency, last_collect_time as LastCollectTime, last_device_status as LastDeviceStatus, last_run_status as LastRunStatus, last_program_name as LastProgramName, last_part_count as LastPartCount, last_operate_mode as LastOperateMode, last_machining_status as LastMachiningStatus, created_at as CreatedAt, updated_at as UpdatedAt";
+        private const string SelectColumns = @"id as Id, device_code as DeviceCode, name as Name, workshop_id as WorkshopId, collect_address_id as CollectAddressId, ip_address as IpAddress, brand_id as BrandId, is_enabled as IsEnabled, {0} as IsOnline, last_ping_time as LastPingTime, last_ping_latency as LastPingLatency, last_collect_time as LastCollectTime, last_device_status as LastDeviceStatus, last_run_status as LastRunStatus, last_program_name as LastProgramName, last_part_count as LastPartCount, last_total_part_count as LastTotalPartCount, last_operate_mode as LastOperateMode, last_machining_status as LastMachiningStatus, created_at as CreatedAt, updated_at as UpdatedAt";
 
         public Machine GetById(int id)
         {
diff --git a/src/CncService/Impl/MachineService.cs b/src/CncService/Impl/MachineService.cs
index f6a1235..2700db0 100644
--- a/src/CncService/Impl/MachineService.cs
+++ b/src/CncService/Impl/MachineService.cs
@@ -130,6 +130,7 @@ namespace CncService.Impl
                 PartCount = machine.LastPartCount,
                 RunStatus = machine.LastRunStatus ?? latest?.RunStatus,
                 OperationMode = machine.LastOperateMode,
+                TotalPartCount = machine.LastTotalPartCount,
                 SpindleSpeedSet = null,
                 FeedSpeedSet = null,
                 SpindleSpeedActual = null,
diff --git a/src/CncSimulator/Device/DeviceSimulator.cs b/src/CncSimulator/Device/DeviceSimulator.cs
index 6d8a9e8..a325e8e 100644
--- a/src/CncSimulator/Device/DeviceSimulator.cs
+++ b/src/CncSimulator/Device/DeviceSimulator.cs
@@ -99,6 +99,17 @@ namespace CncSimulator.Device
                 case "same_part":
                     SetScenario("same_part", 999);
                     break;
+                case "time_freeze":
+                    // 冻结时间：Tag的time保持不变，value继续正常更新
+                    _state.FreezeTime = true;
+                    if (!_state.FrozenTimeValue.HasValue)
+                        _state.FrozenTimeValue = DateTime.Now;
+                    break;
+                case "time_unfreeze":
+                    // 解冻时间：恢复正常time更新
+                    _state.FreezeTime = false;
+                    _state.FrozenTimeValue = null;
+                    break;
             }
         }
 
diff --git a/src/CncSimulator/Device/DeviceState.cs b/src/CncSimulator/Device/DeviceState.cs
index 57d9a2c..b50c5c7 100644
--- a/src/CncSimulator/Device/DeviceState.cs
+++ b/src/CncSimulator/Device/DeviceState.cs
@@ -58,6 +58,13 @@ namespace CncSimulator.Device
         /// <summary>数据变化间隔（秒）</summary>
         public int DataChangeInterval { get; set; } = 10;
 
+        // ===== 时间冻结（测试time不变value变的边界条件） =====
+        /// <summary>时间冻结开关：true时Tag的time字段保持不变，value照常更新</summary>
+        public bool FreezeTime { get; set; } = false;
+
+        /// <summary>冻结时使用的固定时间（null时首次冻结取当前时间）</summary>
+        public DateTime? FrozenTimeValue { get; set; } = null;
+
         // ===== 统计信息 =====
         /// <summary>本次启动后累计总加工零件数</summary>
         public int TotalPartsSinceStart { get; set; } = 0;
diff --git a/src/CncSimulator/Generator/FanucDataGenerator.cs b/src/CncSimulator/Generator/FanucDataGenerator.cs
index 57f2b33..2918984 100644
--- a/src/CncSimulator/Generator/FanucDataGenerator.cs
+++ b/src/CncSimulator/Generator/FanucDataGenerator.cs
@@ -31,7 +31,10 @@ namespace CncSimulator.Generator
         private JArray GenerateTags(DeviceState state)
         {
             var tags = new JArray();
-            DateTime baseTime = DateTime.Now;
+            // 如果设备设置了时间冻结，使用冻结的固定时间；否则取当前时间
+            DateTime baseTime = state.FreezeTime && state.FrozenTimeValue.HasValue
+                ? state.FrozenTimeValue.Value
+                : DateTime.Now;
 
             // 每个tag的时间基准上随机偏移 -5~0 秒
             DateTime TagTime()