Author information: C# via PPI protocol operations of Siemens PLC Siemens PLC and computer communication using PPI protocol is not public. I spent two weeks time, research PPI protocol, crack PPI protocol. .

include processor files - each processor file is guarded.pic串口通信c源码 //帧头//查询长度，控制参数//检验和//检验和//寄存器起始地址