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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。
图1—4中的A，B为输入逻辑变量，M为输出逻辑变量，它们之间的“与”、“或”、“非”逻辑运算关系如表1．1所示。用继电器电路或梯形图可以实现基本逻辑运算，触点的串联可实现“与”运算，触点的并联可实现“或”运算，用常闭触点控制线圈可实现“非”运算(见图1-4)。多个触点的串、并联电路可以实现复杂的逻辑运算，例如图l-3中的继电器电路实现的逻辑运算可用逻辑代数表达式表示为
KEB F4 Frequenzumrichter 07.F4.C1D-3420/1.4
Siemens Getr.Mot. FDU1109/2070250/2KJ1503-6EM13-6HJ1/KAZ48-LA90SB4E
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Johnson controls LP-FX16D01-000C
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Heidenhain 300.174
O-I OWENS-ILLINOIS INSPECTION CONTROLLER
SEW-Eurodrive MGFAS2-D***-SNI-B/ECR
Allen Bradley Servo Motor - MPL-B430P-MK22AA+Stber GetriebePA421SPD0100MF
Alpha Getriebe VDS 050-MF1-10-131-BF
DGD Gardner Denver Controller A S4R 960076
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DGD Gardner S4S5R 960077
Vickers KEDG4V52C70N7VMU1H720
FOculus F0442SB IEEE1394
Siemens 1FT 5064-0AF71-1-Z
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SEW Eurodrive KA 37 CM71M/TF/RH1M/***60
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Rittal Wandkühlgert SK 3328 140
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Endress+Hauser PMD235-KB9F1EY1Y
SEW Eurodrive PSBF622 CM71S/BR/HR/TF/AS1H/SB66
Allen Bradley MPL-B420P-MK22AA+Stber GetriebePA421SPD0100MF
DUFF NORTON F826477
TELEMECANIQUE ATV58EU29N4ZH54
Bucher QT 52-040R
OMRON V400-F050 2D CODE
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Kobold DUK -11G9HC34PR
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