As shown in figures "A", "B", "C", and "D" of the illustrated PLC controlled heating system, in addition to the clock timer, run and stop contacts all...

Question

As shown in figures "A", "B", "C", and "D" of the illustrated PLC controlled heating system, in addition to the clock timer, run and stop contacts all being closed, what other input requirements must be met for the boiler to be firing?

Accepted Answer

The boiler water sensor contacts must be closed AND either the space air sensor or tank water sensor contacts must be closed.

Engine 2014: Electricity

As shown in figures "A", "B", "C", and "D" of the illustrated PLC controlled heating system, in addition to the clock timer, run and stop contacts all being closed, what other input requirements must be met for the boiler to be firing?

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