The input-output module FW821 is a UL / ULC listed device according to UL864 and ULC-S527 for fire protection signaling systems for indoor use. 

The FW821 input-output module provides one 24VDC output and one feedback input monitor.

The FW821 is an intelligent addressable module and takes one address on the Signaling Line Circuit (SLC) or Data Communication Link (DCL) of the fire alarm control panel.

The input line is monitored for open line faults and ground faults, and the contact must thus be wired with an end-of-line resistor. The output line is monitored for open lines, short-circuit faults, ground faults, and external 24VDC power source loss.

• Useful to confirm a retroactive action

• Internal electronic address

• Compatible with EOLR 10K Ohms (FW421)

• White surface box available as an option (FW800/801)

• Status LED indicator