C#與PLC通信程序

1、DllImport("w95_s7.dll")private extern static int load_tool(byte nr, string device, byte, adr_table);對“打開 PLC 連接函數(shù)”進(jìn)行簡單的C#封裝后代碼如下：/ <summary> 建立連接，同一個連接只容許調(diào)用一次/ </summary>/ <param name="connNo">連接號 connNo 為 1-4 </param>/<param name="connParam"&

2、gt;連接參數(shù) ,PLCConnParam定義的參數(shù)結(jié)構(gòu)體</param>/ <returns> 返回 10 進(jìn)制錯誤號， 0 表示沒有錯誤 </returns>publicstaticintOpen(byteconnNo, PLCConnParam connParam)intPLCCPUCnt = connParam.Length;if(PLCCPUCnt <=0)/ 傳遞參數(shù)不正確return- 1 ;byte , btr =newbytePLCCPUCnt +1 ,4 ;/ 多分配1 個, 用于存放0 作為連接結(jié)束標(biāo)記/ 轉(zhuǎn)換連接表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 ;/ 調(diào)用初始化函數(shù) , 打開連接interrCode = load_tool(connNo,"S7ONLINE", btr

4、);returnerrCode;精選范本 ,供參考！publicstructPLCConnParampublicbyteAddres;/定義 CPU 的 MPI/DP地址/public byte SegmentId; /保留為 0publicbyteRack;/定義 CPU 的機架號publicbyteSlot;/定義 CPU 的槽號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;精選范本 ,供參考！btrconnParam.Length, 0 = 0;btrconnParam.Length, 1 = 0;btrconnParam.Length, 2 = 0;btrconnParam.Length, 3 = 0;interrCode = load_tool