描述
在PLC的编程语言中，梯形图是最为广泛使用的语言，通过PLC的指令系统将梯形图变成PLC能接受程序，由编程器键入到PLC用户存储区去。而梯形图与继电器控制原理图十分相似，主要原因是PLC梯形图的发明大致上沿用户继电器控制电路的元件符号
ALLEN BRADLEY 1745-PCC USPP 1745PCC
ALLEN BRADLEY 1745-E101A SLC 100 EXPANION UNIT
ALLEN BRADLEY 1745-E151 SER.A SLC 150 EXPANION
ALLEN BRADLEY 1745-LP101 SLC 100 PLC UNIT
Allen Bradley 1745-LP151 Processor Unit Series C
1745-LP156 SLC 150 Allen Bradley Processor Unit TESTED
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Allen Bradley 1745-E151 Expansion Module
Allen Bradley PLC SLC 100 Processor 1745-LP101
NIB Allen Bradley 1745-E151 SLC 150 expansion unit
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Allen Bradley 1745-LP153 Processor Unit Series C #30931
Allen Bradley Programmable Controler 1745-LP153
Allen Bradley SLC 150, 1745-LP157 Processor
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