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Inst Tools > Blog > Practical Questions > Programmable Logic Controller (PLC) Questions and Answers – 13

Programmable Logic Controller (PLC) Questions and Answers – 13

Last updated: June 6, 2018 10:07 am
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Siemens S7-200 PLC Questions and Answers

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

Siemens S7-200 PLC

Examine the following relay ladder logic (RLL) program for this Siemens PLC, determining the statuses of the two lamps provided the pressure switch sees a fluid pressure of 30 PSI and the level switch sees a liquid level of 4 feet:

Siemens S7-200 PLC Logic

Answer :

Green lamp is on, red lamp is off.

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Credits :  Tony R. Kuphaldt – under CC BY 1.0

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1 Comment
  • azetou says:
    August 30, 2017 at 1:43 pm

    In the Relay Ladder Logic program, you have to show the second line L2 of the power supply, or else both lamps will be off whatever the status of the inputs.

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