diff --git a/SCADA/Program/DataService/PLCGroup.cs b/SCADA/Program/DataService/PLCGroup.cs
index ecffaaf..536570c 100644
--- a/SCADA/Program/DataService/PLCGroup.cs
+++ b/SCADA/Program/DataService/PLCGroup.cs
@@ -313,6 +313,18 @@ namespace DataService
         {
             if (_plcReader.IsClosed) return -1;
             byte[] cache = (byte[])_cacheReader.Cache;
+            if (_items.Count == 1)
+            {
+                byte[] rcvBytes = _plcReader.ReadBytes(_items[0].Address, (ushort)cache.Length);
+                if (rcvBytes == null) return -1;
+                for (int j = 0; j < rcvBytes.Length; j++)
+                {
+                    if (cache[j] != rcvBytes[j])
+                        _changedList.Add(0);
+                    cache[j] = rcvBytes[j];
+                }
+                return 1;
+            }
             int offset = 0;
             foreach (PDUArea area in _rangeList)
             {
diff --git a/SCADA/Program/HMIControl/bin/Debug/DataHelper.dll b/SCADA/Program/HMIControl/bin/Debug/DataHelper.dll
index 2c141f8..5ab722f 100644
Binary files a/SCADA/Program/HMIControl/bin/Debug/DataHelper.dll and b/SCADA/Program/HMIControl/bin/Debug/DataHelper.dll differ
diff --git a/SCADA/Program/HMIControl/bin/Debug/DataService.dll b/SCADA/Program/HMIControl/bin/Debug/DataService.dll
index 0668ebe..5e2ae61 100644
Binary files a/SCADA/Program/HMIControl/bin/Debug/DataService.dll and b/SCADA/Program/HMIControl/bin/Debug/DataService.dll differ
diff --git a/SCADA/Program/HMIControl/bin/Debug/HMIControl.VisualStudio.Design.dll b/SCADA/Program/HMIControl/bin/Debug/HMIControl.VisualStudio.Design.dll
index fde0077..529fb0c 100644
Binary files a/SCADA/Program/HMIControl/bin/Debug/HMIControl.VisualStudio.Design.dll and b/SCADA/Program/HMIControl/bin/Debug/HMIControl.VisualStudio.Design.dll differ
diff --git a/SCADA/Program/HMIControl/bin/Debug/HMIControl.dll b/SCADA/Program/HMIControl/bin/Debug/HMIControl.dll
index 15ed836..a858de3 100644
Binary files a/SCADA/Program/HMIControl/bin/Debug/HMIControl.dll and b/SCADA/Program/HMIControl/bin/Debug/HMIControl.dll differ
diff --git a/SCADA/TagConfig/TagConfig/obj/x86/Debug/TagConfig.csproj.FileListAbsolute.txt b/SCADA/TagConfig/TagConfig/obj/x86/Debug/TagConfig.csproj.FileListAbsolute.txt
new file mode 100644
index 0000000..846101c
--- /dev/null
+++ b/SCADA/TagConfig/TagConfig/obj/x86/Debug/TagConfig.csproj.FileListAbsolute.txt
@@ -0,0 +1 @@
+C:\Users\Yinan\Documents\Github\SharpSCADA\SCADA\TagConfig\TagConfig\bin\Debug\TagConfig.exe.config