diff --git a/Main/MCRun/Program.cs b/Main/MCRun/Program.cs
index 876586d..baf2532 100644
--- a/Main/MCRun/Program.cs
+++ b/Main/MCRun/Program.cs
@@ -119,7 +119,7 @@ namespace MCRun
             };
             WorkbenchSingleton.InitializeWorkbench();
 
-            PlcBusiness.Instance.InitPlcConnect(PlcType.SiemensPlc, "127.0.0.1", 9600);
+            PlcBusiness.Instance.InitPlcConnect(PlcType.SiemensPlc, "127.0.0.1", 12);
 
             ICSharpCode.Core.LoggingService<Program>.Debug("starting workbench...");
             Form frmMain = WorkbenchSingleton.Workbench as Form;
diff --git a/Mesnac.PlcUtils/PlcBusiness.cs b/Mesnac.PlcUtils/PlcBusiness.cs
index 13eba51..0dbb021 100644
--- a/Mesnac.PlcUtils/PlcBusiness.cs
+++ b/Mesnac.PlcUtils/PlcBusiness.cs
@@ -33,7 +33,7 @@ namespace Mesnac.PlcUtils
                 string str = System.Environment.CurrentDirectory;
                 str = str + "\\Mesnac.PlcUtils.dll";
                 Assembly assembly = Assembly.LoadFile(str); // 加载程序集（EXE 或 DLL）
-                string AssemName = "JSSD.PolarBind.Plc.Impl." + plcType.GetDescription();
+                string AssemName = "Mesnac.PlcUtils.Impl." + plcType.GetDescription();
                 var obj = assembly.CreateInstance(AssemName, true);
                 plcInstance = obj as IPlc;
                 if (plcInstance == null)
@@ -71,7 +71,14 @@ namespace Mesnac.PlcUtils
 
         public bool readBoolValue(string address)
         {
-            return plcInstance.readBoolByAddress(address);
+            if(plcInstance != null)
+            {
+                return plcInstance.readBoolByAddress(address);
+            }
+            else
+            {
+                return false;
+            }
         }
 
     }