Communication Design of PLC's Distributed Control System Based on RS485
Mei Yang · Journal of Beijing Institute of Graphic Communication · 2008
Taking the FX2N family of PLC as the sub-station and IPC as the master station,this paper describes the organization of Distributed Control System through RS485 interface standard.Analyzing computer link communication protocol supported by FX2N family of PLC,the paper discusses the flow chart of system operation interface and supplies the Delphi code of communication between IPC and PLCs.The system approves one IPC can monitor several PLCs.