描述
PLC控制着一个复杂系统，所能看到的是上下两排错开的输入输出继电器接线端子、对应的指示灯及PLC编号，就像一块有数十只脚的集成电路。任何一个人如果不看原理图来检修故障设备，会束手无策，查找故障的速度会特别慢。
BALDOR VECTOR DRIVER ZD38D8A04-ERD 230VAC 50HzB 11AMP
MCVAN INSTRUMENT BWD 330A SPECTRUM ANALYSER
ALLEN-BRADLEY SLC 500 5/01 CPU 1747-L514 WITH MODULES
TOKYO SEIMITSU CONTOURECORDER SURF COM7 53A
SIEMENS COROS OP5-A1 6AV3505-1FB01 OPERATING PANEL
BRUEL & KJAER TYPE 2804 MICROPHONE POWER SUPPLY
MICROPOS MMC 7010 GEM-SYSYTEM AB ARTNR 66K018V 110VAC
SCHOTT GERATE SLK 6 MULTI-TALENT HOT/STIRRERS PLATE
LEICA HI 1220 ELECTRIC HEATING HOT PLATE 230VAC
