FW821 I/O Module
The input-output module FW821 is a UL / ULC listed device according to UL864 and ULC-S527 for fire protective signaling systems for indoor use. FW821 provides one 24VDC output and in addition monitoring for one feedback input contact. The input line is monitored for open line faults and ground faults and the contact must be wired with an end of line resistor. The output line is monitored for open line, short circuit faults, ground faults, external 24VDC power source loss and an end of line resistor is needed as well.Download Datasheet
When the output is activated or the feedback contact transfers, the device LED will indicate the event condition by fast blinking.
A return to normal condition will cause the event to disappear and the device LED indicator will return to the red idle condition. The FW821 is intelligent addressable and takes one address on the signaling line circuit of the fire alarm control panel.