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。
RELIANCE 0-57413-1 DCS MEMORY MODULE**XLNT**
RELIANCE 0-57413-E DCS MEMORY MODULE**XLNT**
RELIANCE ELECTRIC 0-48680-521 NSFP 048680521
RELIANCE ELECTRIC GV3000SE-AC012-AA-DBU NSFP GV3000SEAC
RELIANCE ELECTRIC 0-56313-1 NSFP 0563131
RELIANCE ELECTRIC 802288-45A USPP 80228845A
RELIANCE ELECTRIC 0-52823 NSFP 052823
RELIANCE ELECTRIC 0-52851 NSFP 052851
6-75-YRVIT Reliance 75-Gallon Natural Gas Water Heater
RELIANCE ELECTRIC 78093-2R USPP 780932R
RELIANCE ELECTRIC 0-51818-2 NSPP 0518182
RELIANCE ELECTRIC 0-51839-11 NSPP 05183911
RELIANCE ELECTRIC 5VU41007 USPP 5VU41007
