Programmable Logic Controller (PLC) Questions and Answers
Suppose we have an Allen-Bradley model PLC connected to a pair of pushbutton switches and light bulbs as shown in this illustration:
Examine the following relay ladder logic (RLL) program for this Allen-Bradley PLC, determining the necessary switch statuses to energize lamp Y, and the necessary switch statuses to energize switch Z:
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Credits : Tony R. Kuphaldt – under CC BY 1.0
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