Suppose we have an Allen-Bradley MicroLogix 1000 controller connected to three process switches as shown in this illustration:
Determine the necessary switch actuation statuses (i.e. low versus high process stimulus) to turn the blue lamp on, given the following program running in the PLC:
Next, determine the necessary switch actuation statuses (i.e. low versus high process stimulus) to turn the yellow lamp on, given the same PLC program.
Answer
High temperature and low flow and high level are required to energize the blue lamp.
Low temperature and high flow and high level are required to energize the yellow lamp.
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Credits : by Tony R. Kuphaldt – under CC BY 1.0
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