PC与PLC之间运用modbusTCP协议通讯，发送起始地址和寄存器数量接受PLC寄存器地址-Between PC and PLC communication protocol using modbusTCP send start address and the number of registers to accept PLC register address

PC和S7-300 PLC通讯所需dll:komfort.dll,Prodave6.dll,w95_s7.dll(Communication between PC and S7-300 PLC required dll:komfort.dll, Prodave6.dll, w95_s7.dll)