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> public static int Open( byte connNo, PLCConnParam connParam)int PLCCPUCnt = connParam.Length;if (PLCCPUCnt <=0) / 传递参数不正确return - 1;byte , btr = new byte PLCCPUCnt +1, 4; / 多分配 1 个, 用于存放 0 作为连接结

3、束标记/ 转换连接表for ( int i =0; i < connParam.Length; i+)btri,0 = connParami.Addres;btri,1 = 0;btri,2 = connParami.Slot;btri,3 = connParami.Rack;btrconnParam.Length,btrconnParam.Length,btrconnParam.Length,btrconnParam.Length,/ 调用初始化函数 , 打开连接int errCode = load_tool(connNo,0 = 0;1 = 0;2 = 0;3 = 0;"S

4、7ONLINE" , btr);return errCode;publicstruct PLCConnParampublic byte Addres;/ 定义 CPU 的 MPI/DP 地址保留为 0/public byte SegmentId; /publicbyte Rack;/ 定义 CPU 的机架号public byte Slot;/ 定义 CPU 的槽号public enum PLCBlockTypeI = 1, /Input bytes Q = 2, /Output bytes M = 3, /Flag bytes T = 4, /Timer wordsZ = 5, /C

5、ounter wordsD = 6, /Data from DBDllImport( "w95_s7.dll" ) private extern static int adr_table);/ <summary>/ </summary>/<param name="connNo">/<param name="connParam">/ <returns> </returns>load_tool( byte nr, string device</param>

6、</param>byte ,public static int Open( byte connNo, PLCConnParam connParam) int PLCCPUCnt = connParam.Length;if (PLCCPUCnt <= 0)return -1byte , btr =new byte PLCCPUCnt + 1, 4for ( int i = 0; i < connParam.Length; i+)btri, 0 = connParami.Addres;btri, 1 = 0;btri, 2 = connParami.Slot;btri, 3 = connParami.Rack;btrc onn Param.Le ngth, 0 = 0;btrc onn Param.Le ngth, 1 = 0;btrc onn Param.Le ngth, 2 = 0;&quo