C#与PLC通信程序

1、DllImport("w95_s7.dll")private extern static int load_tool(byte nr, string device, byte, adr_table);对“打开 PLC 连接函数”进行简单的C#封装后代码如下：/ <summary> 建立连接，同一个连接只容许调用一次/ </summary>/ <param name="connNo">连接号 connNo 为 1-4 </param>/<param name="connParam"&

2、gt;连接参数 ,PLCConnParam定义的参数结构体</param>/ <returns> 返回 10 进制错误号， 0 表示没有错误 </returns>publicstaticintOpen(byteconnNo, PLCConnParam connParam)intPLCCPUCnt = connParam.Length;if(PLCCPUCnt <=0)/ 传递参数不正确return- 1 ;byte , btr =newbytePLCCPUCnt +1 ,4 ;/ 多分配1 个, 用于存放0 作为连接结束标记/ 转换连接表for ( i

3、nti =0 ; i < connParam.Length; i+)btri,0 = connParami.Addres;btri,1 =0 ;btri,2 = connParami.Slot;btri,3 = connParami.Rack;btrconnParam.Length,0 =0 ;btrconnParam.Length,1 =0 ;btrconnParam.Length,2 =0 ;btrconnParam.Length,3 =0 ;/ 调用初始化函数 , 打开连接interrCode = load_tool(connNo,"S7ONLINE", btr

4、);returnerrCode;精选范本 ,供参考！publicstructPLCConnParampublicbyteAddres;/定义 CPU 的 MPI/DP地址/public byte SegmentId; /保留为 0publicbyteRack;/定义 CPU 的机架号publicbyteSlot;/定义 CPU 的槽号public enum PLCBlockTypeI = 1, /Input bytesQ = 2, /Output bytesM = 3, /Flag bytesT = 4, /Timer wordsZ = 5, /Counter wordsD = 6, /Dat

5、a from DBDllImport("w95_s7.dll")privateexternstaticintload_tool(bytenr,stringdevice,byte,adr_table);/ <summary>/ </summary>/<param name="connNo"></param>/<param name="connParam"></param>/<returns></returns>publicstaticintO

6、pen(byteconnNo, PLCConnParam connParam)intPLCCPUCnt = connParam.Length;if(PLCCPUCnt <= 0)return-1byte, btr =newbytePLCCPUCnt + 1, 4for( inti = 0; i < connParam.Length; i+)btri, 0 = connParami.Addres;btri, 1 = 0;btri, 2 = connParami.Slot;btri, 3 = connParami.Rack;精选范本 ,供参考！btrconnParam.Length, 0 = 0;btrconnParam.Length, 1 = 0;btrconnParam.Length, 2 = 0;btrconnParam.Length, 3 = 0;interrCode = load_tool