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1、最近做一个PC通过编程口与FXPLC通讯的程序,在网上找好久,内部软元件的地址还是找不全。没办法，只好使用串口监视软件分析GXDeveloperPLC编程软件发送的代码 三菱FX系列PLC编程口通信协议总览该协议实际上适用于PLC编程端口以及FX-232AW模块的通信。感谢网友visualboy提供。通讯格式：命令命令码目标设备DEVICEREADCMD0X,Y,M,S,T,C,DDEVICEWRITECMD1X,Y,M,S,T,C,DFORCEONCMD7X,Y,M,S,T,CFORCEOFFCMD8X,Y,M,S,T,C传输格式:RS232C波特率:9600bps奇偶:even校验:累加方
2、式（和校验）字符:ASCII16进制代码：ENQ05H请求ACK06HPLC正确响应NAK15HPLC错误响应STX02H报文开始ETX03H报文结束帧格式：STXCMDDATA.DATAETXSUM(upper)SUM(lower)例子：STX,CMD,ADDRESS,BYTES,ETX,SUM02H,30H,31H,30H,46H,36H,30H,34H,03H,37H,34HSUM=CMD+.+ETX；30h+31h+30h+46h+36h+30h+34h+03h=74h;累加和超过两位取低两位命令格式1、DEVICEREAD（读出软设备状态值）计算机向PLC发送：始 / 命令首地址位数
3、终和校验STXCMDGROUPADDRESSBYTESETXSUM例子：从D123开始读取4个字节数据02h30h31h,30h,46h,36h30h,34h03h37h,34h地址算法:address=address*2+1000h再转换成ASCII31h,30h,46h,36hPLC返回STX1STDATA2NDDATA.LASTDATAETXSUM注：最多可以读取64个字节的数据例子：从指定的存储器单元读到3584这个数据02h33h35h38h34h03h44h,36h2、DEVICEWRITE（向PLC软设备写入值）始命令首地址位数数据终和校验STXCMDGROUPADDRESSBY
4、TES1STDATA2NDDATA.LASTDATAETXSUM例子：向D123开始的两个存储器中写入1234,ABCD02h31h31h,30h,46h,36h30h,34h33h,34h,31h,32h,43h,44h,41h,42h03h34h,39hPLC返回ACK(06H)接受正确NAK(15H)接受错误3、位设备强制置位/复位FORCEON置位始命令地址终和校验STXCMDADDRESSETXSUM02h37haddress03hsumFORCEOFF复位始命令地址终和校验STXCMDADDRESSETXSUM02h38haddress03hsumPLC返回ACK(06H)接受正确
5、NAK(15H)接受错误设备强制中的地址公式:Address=Address/8+100h说明：1.帧中的BYTES表示需要读取或者写入的字节数。2.地址算法上有说明。3.累加和是从STX后面一个字节开始累加到ETX的和。通过串口监视得到的数据如下:PLC型号：FX0N使用GXDeveloper的在线调试软元件测试功能以下列出不同的操作发送的不同内容，前面一段是Hex码后面一段是对应的ASCII码/CMDONYO/023730303035034646.70005.FF/CMDOFFYO/023830303035033030.80005.00/CMDONY1/023730313035033030
6、.70105.00/CMDOFFY1/023830313035033031.80105.01/CMDONXO/023730303034034645.70004.FE/CMDOFFXO/023830303034034646.80004.FF/CMDONX1/023730313034034646.70104.FF/CMDOFFX1/023830313034033030.80104.00/CMDONT0/023730303036033030.70006.00/CMDOFFT0/023830303036033031.80006.01/CMDONT1/023730313036033031.70106.0
7、1/CMDOFFT1/023830313036033032.80106.02/CMDONC0/023730303045033046.7000E.0F/CMDOFFC0/023830303045033130.8000E.10/CMDONC1/023730313045033130.7010E.10/CMDOFFC1/023830313045033131.8010E.11/CMDONM0/023730303038033032.70008.02/CMDOFFM0/023830303038033033.80008.03/CMDONM1/023730313038033033.70108.03/CMDOFF
8、M1/023830313038033034.80108.04/CMDONS0/023730303030034641.70000.FA/CMDOFFS0/023830303030034642.80000.FB/CMDONS1/023730313030034642.70100.FB/CMDOFFS1/023830313030034643.80100.FC/CMDWRITED015AB16Bit/02313130303030324142313503.1100002AB15.343040/CMDWRITED115AB15AB32Bit/02313130303030344142313541.1100004AB15A423135033242B15.2B/CMDWRITET015AB16Bit/02313038303030324142313503.1080002AB15.343747/CMDWRITET115AB15AB32Bit/0231303830
