描述
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。
Wicat 150WS Graphics Video Card 1982 Intel D8275
Wicat 150WS 1982 Z80 MultiBUS 6522 S150 I/O Controller
Wicat 150WS 1982 Z80 MultiBUS Memory Card TMS4164 TMM
Wicat 150WS 1982 Z80 MultiBUS MFM Disk Controller Card
Canon Canonical H04524-002 030-0980-002 Network Card
Quantum ProDrive 40S SCSI Hard Drive 50-pin 940-40-9402
Hard Drive Quantum Q250 SCSI Apple 40MB 50-pin 76-45004
LaserMaster ColorTalk II ISA Controller ColorTalkII LC2
