Description
输出设备占30%，线路占5%。前二项共20%故障属于PLC的内部故障，它可通过PLC本身的软、硬件实现检测、处理；而其余80%的故障属于PLC的外部故障。因此，PLC生产厂家都致力于研制、发展用于检测外部故障的专用智能模块，进一步提高系统的可靠性。
Allen Bradley MSR138DP Guardmaster Safety Relay Used
ALLEN BRADLEY GUARDMASTER MSR138DP SAFETY RELAY
Allen Bradley MSR131RTP Guardmaster Safety Relay Used
Allen Bradley Guardmaster Safety Relay 440R-C23018
Allen Bradley Guardmaster Safety Relay 440N-S32013
