描述
使用继电器电路或PLC的梯形图可以实现开关量的逻辑运算。图1—4的上面是PLC的梯形图，梯形图中某些编程元件(如输出继电器和辅助继电器)的线圈“通电”时，其常开触点闭合，常闭触点断开，称该编程元件为1状态。当它们的线圈“断电”时，其常开触点断开，常闭触点闭合，称该编程元件为0状态。
Square D I-Line Main Lug Panelboard 600 Amp 600 V 3P 3W
Square D Mod 6 Motor Control Center Model 6 600 A MCC
General Electric 7098 20″ 600 A Amp MCC Feeder Bucket
GE General Electric THLC434400 400 Amp A
GE General Electric THLC434300 300 Amp A or THLC436300
Fisher Valve Size 1 Type EZ w/ 582i Flow Control
Fisher Valve Size 3/4 Type EZ w/ 582i Flow Control
Yaskawa CPS-150F Yasnac Power Supply CPS150F Fuji
Siemens Model 95 Fused Type 200A Size 4 MCC Bucket
Omron CJ1H-CPU65H CPU Unit 128K Memory CJ1HCPU65H
GE Spectra SB364RG Busway 200 A Bus Plug Fusible 3W G
