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。
Agilent HP 86103A /202/ Optical / Electrical Module
HP – AGILENT 89441A VECTOR SIGNAL ANALYZER/ RF /OPTS!
HP/Agilent 83711B Synthesized CW Generator, 20 GHz
Agilent/HP 54642D Mixed Signal Oscilloscope
HP/Agilent E5091A ENA Series Multiport Test Set
HP Agilent 4142B modular DC monitor with 8 41421B units
HP Agilent G1377A U/WPS and G1330B Chiller 1100 Series
Agilent/HP DSO6054A Mixed Signal Oscilloscope
HP Agilent 83480A 83493A Clk Recovery 83485A OE Modules
HP AGILENT 83711B SYNTHESIZED CW GENERATOR 1-20GHz
Agilent HP 3585B Spectrum Analyzer
