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Programmable Logic Controller (PLC) Questions and Answers – 10

Programmable Logic Controller (PLC) Questions and Answers –

Suppose we have a Siemens S7-200 PLC connected to a pair of pushbutton switches and light bulbs as shown in this illustration:

Siemens S7-200 PLC Ladder Logic

Examine the following relay ladder logic (RLL) program for this Siemens PLC, determining the statuses of the two lamps provided neither switch is pressed by a human operator:

Siemens S7-200 PLC Ladder Logic for Switch

Answer :

Output Q 0.1 will activate to energize lamp Y, but the other output (and lamp) will remain off.

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Credits :  Tony R. Kuphaldt – under CC BY 1.0

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Programmable Logic Controller (PLC) Questions and Answers - 10

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