Design of Mine-used Combination Switch Based on PLC

In view of problems of bad performance of anti-interference and difficult maintenance, the paper proposed a design scheme of mine-used intelligent combination switch based on PLC. It gave general structure of main electrical circuit of the switch and introduced design of hardware and software of electrical control circuit namely PLC system of the switch in details. The result of actual test showed that the switch runs reliably and can realize various protections rapidly, which ensures safety and continuity for underground production.