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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.

    Reply

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