fix plcgroup

SCADA/Program/DataService/PLCGroup.cs

@@ -314,9 +314,9 @@ namespace DataService
                 return;
         }
 
-        protected virtual int Poll()
+        protected virtual void Poll()
         {
-            if (_plcReader.IsClosed) return -1;
+            if (_plcReader.IsClosed) return;
             byte[] cache = (byte[])_cacheReader.Cache;
             int offset = 0;
             foreach (PDUArea area in _rangeList)
@@ -325,7 +325,7 @@ namespace DataService
                 if (rcvBytes == null)
                 {
                     //_plcReader.Connect();
-                    return -1;
+                    continue;
                 }
                 else
                 {
@@ -378,7 +378,6 @@ namespace DataService
                 }
                 offset += rcvBytes.Length;
             }
-            return 1;
         }
 
         protected void Update()

SCADA/Program/ModbusDriver/ModbusRTUDriver.cs

@@ -514,7 +514,7 @@ namespace ModbusDriver
             this._cacheReader = new ShortCacheReader();
         }
 
-        protected override unsafe int Poll()
+        protected override unsafe void Poll()
         {
             short[] cache = (short[])_cacheReader.Cache;
             int k = 0;
@@ -523,8 +523,7 @@ namespace ModbusDriver
                 byte[] rcvBytes = _plcReader.ReadBytes(area.Start, (ushort)area.Len);//从PLC读取数据  
                 if (rcvBytes == null)
                 {
-                    _plcReader.Connect();
-                    return -1;
+                    continue;
                 }
                 else
                 {
@@ -637,7 +636,6 @@ namespace ModbusDriver
                     }
                 }
             }
-            return 1;
         }
     }
 

SCADA/Program/ModbusDriver/ModbusTCPDriver.cs

@@ -561,7 +561,7 @@ namespace ModbusDriver
             this._cacheReader = new NetShortCacheReader();
         }
 
-        protected override unsafe int Poll()
+        protected override unsafe void Poll()
         {
             short[] cache = (short[])_cacheReader.Cache;
             int offset = 0;
@@ -571,7 +571,7 @@ namespace ModbusDriver
                 if (rcvBytes == null || rcvBytes.Length == 0)
                 {
                     //_plcReader.Connect();
-                    return -1;
+                    continue;
                 }
                 else
                 {
@@ -638,7 +638,6 @@ namespace ModbusDriver
                     offset += len;
                 }
             }
-            return 1;
         }
 
     }

SCADA/Program/SiemensPLCDriver/SiemensPLCDriver.cs

@@ -734,9 +734,9 @@ namespace SiemensPLCDriver
             this._cacheReader = new NetByteCacheReader();
         }
 
-        protected override int Poll()
+        protected override void Poll()
         {
-            if (_items == null || _items.Count == 0) return -1;
+            if (_items == null || _items.Count == 0) return;
             byte[] cache = (byte[])_cacheReader.Cache;
             int offset = 0;
             foreach (PDUArea area in _rangeList)
@@ -745,7 +745,7 @@ namespace SiemensPLCDriver
                 if (rcvBytes == null)
                 {
                     //_plcReader.Connect();
-                    return -1;
+                    continue;
                 }
                 else
                 {
@@ -798,7 +798,6 @@ namespace SiemensPLCDriver
                 }
                 offset += rcvBytes.Length;
             }
-            return 1;
         }
     }
 }