//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/0750656794-PRELIMS.3D – 21 – [1–22/22]
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Glossary
ADC Analogue to digital converter.
Boolean algebra A mathematical method for simplifying logic gate circuits and PLC
ladder diagrams.
Copying Used to make a copy of a ladder diagram but having a differen t filename.
COM1 Communications port no.1. A serial communications port, which is usually a
9-pin plug situated at the rear of a computer. It enables communications between the
computer and the PLC.
CPU Central processor unit. The CPU is the microchip within the PLC, which
executes the Instruction Program obtained from the converted ladder diagram.
DAC Digital to analogue converter.
DOS Disk operating system. A Microsoft computer ...