C#與PLC通信程序

1、DllImport(w95_s7.dll)privateexternstaticintload_tool(bytenr,stringdevice,byte,adr_table);對(duì)“打開PLC連接函數(shù)”進(jìn)行簡單的C#封裝后代碼如下：/建立連接，同一個(gè)連接只容許調(diào)用一次/連接號(hào)connNo為1-4/連接參數(shù),PLCConnParam定義的參數(shù)結(jié)構(gòu)體/返回10進(jìn)制錯(cuò)誤號(hào)，0表示沒有錯(cuò)誤publicstaticintOpen(byteconnNo,PLCConnParamconnParam)intPLCCPUCnt=connParam.Length;if(PLCCPUCnt=0)/傳遞參數(shù)不正確re

2、turn-1;byte,btr=newbytePLCCPUCnt+1,4;/多分配1個(gè),用于存放0作為連接結(jié)束標(biāo)/轉(zhuǎn)換連接表for(inti=0;iconnParam.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,/ 調(diào)用初始化函數(shù) , 打開連接int errCode = load_tool(connNo

3、, return errCode;0 =0;1 =0;2 =0;3 =0;S7ONLINE , btr)publicstruct PLCConnParampublic byte Addres;/ 定義 CPU 的 MPI/DP 地址/public byte SegmentId; /保留為 0public byte Rack; /定義 CPU 的機(jī)架號(hào)public byte Slot; /定義 CPU 的槽號(hào)publicenumPLCBlockTypeI=1,/InputbytesQ=2,/OutputbytesM=3,/FlagbytesT=4,/TimerwordsZ=5,/Counterw

4、ordsD=6,/DatafromDBDllImport(w95_s7.dll)privateexternstaticintload_tool(bytenr,stringdevice,byte,adr_table);/publicstaticintOpen(byteconnNo,PLCConnParamconnParam)intPLCCPUCnt=connParam.Length;if(PLCCPUCnt=0)return-1byte,btr=newbytePLCCPUCnt+1,4for(inti=0;iconnParam.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;S7ONLINE , btr)btrconnParam.Length,3=0;interrCode=l