Research and Design of Soft PLC based on ARM and SIPROM

PLC is a dedicated control computer and is extensively applied in the fields such as machine manufacturing and industry control, but openness of its hardware structure and the programming system are not uniform due to different manufacturers. To solve incompatibility issue, the soft PLC concept is proposed in the late 90 s of 20th century. A PID is a closed-loop control system and features simple structure, stronger stability and higher reliability, so it is extensively applied in the industry control field. This paper describes the software and hardware structure of the soft PLC system based on ARM7, analyzes and studies PID control algorithm, and studies the PID parameter setting. The above research simulation completes parameter setting of the PID system, accumulates setting experiences, and improves the PID control function performance of the soft PLC.