Description
I/O接口占15%，输入设备占45%，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。
SIEMENS 6SN1111-0AA00-0CB0 REACTOR 6SN11110AA000CB0
SPELLMAN HIGH VOLTAGE DC SUPPLY RHR30P60/C
BAYSIDE PRECISION GEARHEAD PG142-050 NEW 50:1
MAXON 2″ NATURAL GAS SHUT OFF VALVE 5000 SERIES NEW
STI MINISAFE 4600 SERIES SAFETY LIGHT CURTAINS 84″
