Draw a ladder logic control circuit for the electric motor of an air compressor, controlled by two pressure switches: one switch turns the motor on when the pressure falls to 80 PSI, while the other switch turns the motor off when the pressure rises to 105 PSI:
Be sure to include the overload (OL) contact in the 120 volt control circuit (L1 & L2), and include a manual on/off switch as well.
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Credits : by Tony R. Kuphaldt – under CC BY 1.0
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auxiliary contact of "M" to be paralleled with ON/OFF switch & contact of "80 PSI" to be "NO contact" .