Suppose we have a PLC connected to three process switches as shown in this illustration:
In the above diagram :
Determine the switch actuation statuses (i.e. low versus high process stimulus) given the “live” display of the ladder logic program shown here:
Also, determine the status of the lamp connected to the PLC’s Y1 output.
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Credits : Tony R. Kuphaldt – under CC BY 1.0
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The lamp will be energized when pressure & flow high & temp low