Suppose we have an Allen-Bradley MicroLogix 1000 PLC and two pressure switches we need to connect to it.
Allen-Bradley MicroLogix Programmable Logic Controller
![Questions on Allen-Bradley MicroLogix 1000 PLC](https://instrumentationtools.com/wp-content/uploads/2017/08/instrumentationtools.com_allen-bradley-micrologix-1000-plc.jpg)
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](https://instrumentationtools.com/wp-content/uploads/2017/08/instrumentationtools.com_allen-bradley-micrologix-1000-plc-logic.jpg)
Answer :
Both pressure switches need their normally-closed (NC) contact terminals connected to the respective PLC input terminals.
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Allen Bradly Micrologix 1000 PLC now obsolete Now Ab micrologix 1400 PLC is available.
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