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。
PHILIPS PM 3212 25MHz Dual Channel ANALOG OSCILLOSCOPE
Litton FINESERV II Yokogawa Position Controller PC10021
PARKER COMPUMOTOR OEM83-135-MO-DS34 MOTOR 83-135 DOUBLE
TEKTRONIX TYPE 201-2 MODEL E MOBILE O’SCOPE CART
Adept Tech 10335-01101 Power Arm Assembly Cable ROBOT
HIOS CLT-50 Power Supply For Power Screwdriver 120V
Applied Motion Products PS430 Power Supply PS 430
HP/Agilent 436A Digital RF Power Meter With OPTION 022
Weller WES50 Soldering Station
Mykrolis XacTorr Digital Capacitance Diaphragm Gauge
MEDO VP0625 Linear Compressor Vacuum Pump
