Programmable Logic Controller (PLC) Questions and Answers – 15

 Allen-Bradley Programmable Logic Controller (PLC) Questions and Answers

Suppose we have an Allen-Bradley MicroLogix 1000 controller connected to three pushbutton switches as shown in this illustration:

Allen-Bradley MicroLogix controller

Determine the status of each lamp given the following program running in the PLC, assuming switch A is unpressed, switch B is pressed, and switch C is unpressed:

Allen-Bradley MicroLogix controller logic

Answer :

The blue lamp will be off and the yellow lamp will be on.

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Credits :  Tony R. Kuphaldt – under CC BY 1.0

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