diff --git a/Infrastructure/PLC/PCLTool.cs b/Infrastructure/PLC/PCLTool.cs
index f6b869a..47bd0b4 100644
--- a/Infrastructure/PLC/PCLTool.cs
+++ b/Infrastructure/PLC/PCLTool.cs
@@ -43,7 +43,7 @@ namespace DOAN.Infrastructure.PLC
         public  static int  Write(string addr,int num)
         {
           
-            OperateResult write = siemensTcpNet.Write(addr, num);
+            OperateResult write = siemensTcpNet.Write(addr, (byte)num);
             if (write.IsSuccess)
             {