Programmable Logic Controller (PLC) Questions and Answers – 17

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

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

AB PLC Temperature Switch

Determine the necessary switch actuation statuses (i.e. low versus high process stimulus) to turn the yellow lamp on, given the following program running in the PLC:

AB PLC Temperature Switch logic

Next, determine the necessary switch actuation statuses (i.e. low versus high process stimulus) to turn the blue lamp on, given the same PLC program.

Answer:

  • Low temperature and low flow and low level are required to energize the yellow lamp.
  • High temperature and high flow and high level are required to energize the blue lamp.

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Credits : by Tony R. Kuphaldt – under CC BY 1.0

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