The PS24 power supply module is an accessory for Honeywell control panels intended for use in commercial fire installations. The PS24 has two triggerable 24VFW (full wave rectified, unfiltered), 1.7 amp outputs that can either provide 24VFW auxiliary power, or can convert up to two control panel 12VDC EOLR supervised bell circuit outputs to 24VFW EOLR supervised bell outputs.

Each of the PS24 outputs, labeled OUTPUT A and OUTPUT B, has a corresponding controlling input, labeled INPUT A and INPUT B, respectively. Negative voltages applied to INPUT A and INPUT B are passed through to the associated output, allowing the control panel to supervise bell circuit wiring connected to that output (as required for installations which use the output for 24VFW, EOLR supervised bell circuit operation). Applying positive voltages of 9.5– 14VDC to INPUT A and INPUT B produces 24VFW at the respective output terminals.