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Programmable Logic Controller (PLC) Questions and Answers – 21

Allen-Bradley MicroLogix  Programmable Logic Controller :

Suppose we have an Allen-Bradley MicroLogix 1000 PLC and two pressure switches we need to connect to it:

Allen-Bradley MicroLogix 1000 PLC

Determine the necessary contacts on each pressure switch (NO versus NC) we need to connect to the PLC inputs in order to make the lamp turn on when pressure A exceeds 25 PSI and pressure B drops below 139 PSI, given the following program running in the PLC:

Allen-Bradley MicroLogix 1000 PLC Logic

Answer :

Both pressure switches need their normally-closed (NC) contact terminals connected to the respective PLC input terminals.

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

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Programmable Logic Controller (PLC) Questions and Answers - 21

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