diff --git a/SCADA/Example/ClientDriver.dll b/SCADA/Example/ClientDriver.dll
index da28d6e..e83bb9b 100644
Binary files a/SCADA/Example/ClientDriver.dll and b/SCADA/Example/ClientDriver.dll differ
diff --git a/SCADA/Example/DataHelper.dll b/SCADA/Example/DataHelper.dll
index d1dc396..bba0fd8 100644
Binary files a/SCADA/Example/DataHelper.dll and b/SCADA/Example/DataHelper.dll differ
diff --git a/SCADA/Example/DataService.dll b/SCADA/Example/DataService.dll
index b916cdb..ce190f3 100644
Binary files a/SCADA/Example/DataService.dll and b/SCADA/Example/DataService.dll differ
diff --git a/SCADA/Program/DataService/PLCGroup.cs b/SCADA/Program/DataService/PLCGroup.cs
index c9b4e79..1f89da8 100644
--- a/SCADA/Program/DataService/PLCGroup.cs
+++ b/SCADA/Program/DataService/PLCGroup.cs
@@ -304,6 +304,7 @@ namespace DataService
             {
                 lock (sync)
                 {
+                    _changedList.Clear();
                     Poll();
                     if (_changedList.Count > 0)
                         Update();
@@ -417,7 +418,6 @@ namespace DataService
                         item.Update(item.Read(), dt, QUALITIES.QUALITY_GOOD);
                 }
             }
-            _changedList.Clear();
         }
 
         public void Dispose()
diff --git a/SCADA/dll/DataService.dll b/SCADA/dll/DataService.dll
index 92229a8..9c34813 100644
Binary files a/SCADA/dll/DataService.dll and b/SCADA/dll/DataService.dll differ
diff --git a/SCADA/dll/SiemensPLCDriver.dll b/SCADA/dll/SiemensPLCDriver.dll
index 6ff1259..632f720 100644
Binary files a/SCADA/dll/SiemensPLCDriver.dll and b/SCADA/dll/SiemensPLCDriver.dll differ