描述
根据统计资料表明：在PLC控制系统的故障中，CPU占5%，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。
AX06-0151 GENUINE RICOH Aficio Stepper Motor Drive Unit
PARKER COMPUMOTOR SX SERIES MICROSTEP DRIVE SX106-178-E
PARKER SX-8 MICROSTEP DRIVE/INDEXER WITH S106-250-MO
Parker Compumotor Microstep Drive S6-Drive , S Series
Parker Compumotor Microstep Drive SX Series SX8-DRIVE
Lot 2 Sigma 20-2223D Stepper Step/Stepping DC Motor 4P
Compumotor SX8-Drive Microstep Drive
