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:
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:
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