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
Square D/Symax 8020-SCP-423 Processor Series E (UGC)
8020SCP423, Model 400, Rev 4.00
Beijer Electronics E-700 PLC Operator Panel E700 (ULN)
Type 02440G, No. 0237-002
Fanuc A06B-0313-B672#0008 AC Servo Motor -REFURBISHED
Modicon 120-147-002 AC Servo Motor *REFURBISHED*
Fanuc A06B-0331-B784#7075 AC Servo Motor -REFURBISHED-
Square D/Symax 8020-SCP-523 Processor Series I (UGC)
8020SCP523, Model 500
Square D/Symax 8020-SCP-523 Processor Series M1 (UGC)
8020SCP523, Model 500, Rev 9.00
Modicon AS-506P-008 CNC Memory Board Rev C15 (UEX)
Modicon AS-P140-213 Programmer ASP140213 (UGC)
