The C4/C4P/C8/C8P power control modules add 4 or 8 zones respectively, to an FPO power supply system The C4/C4P/ C8/C8P accept either one or two voltage sources, either of which are selectable for output on a zone-by-zone basis Each zone is fully controllable via a zone input which accepts a voltage, relay contact, or open collector input Each zone output is selectable for FAI operation, fail-safe or fail-secure, and voltage or relay contact output The suffix "P" added to the model number denotes Class 2 Power Limited outputs