GCAN PLC Based on Modbus and S7-300 Communication System
A GCAN PLC with a 4G network module is used to communicate with the S7-300 PLC to enable IoT con-nectivity of reciprocating compressors.Aiming at the problem that the CP340 communication module of the S7-300 PLC can not realize Modbus communication,TIA Portal and Open PCS software are used for programming.RS-485 is used ac-cording to the communication format of Modbus RTU,so that the CP340 communication module can achieve CRC verifica-tion,and the Modbus RTU communication system of S7-300 PLC and GCAN PLC is completed.After communication test,the system runs stably and CRC verification is correct,and the compressor instrument data can be transmitted in real time.
NETL
NSTL
万方数据
