Honeywell FS24X Plus User Manual page 39

Combined Alarm and Fault Relay Interface Circuits
Fault relay configured normally energized and wired using ordinarily open contact. i.e.,
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continuity of signal circuit will be broken if relay de-energized.
Any loss of continuity in the power circuit will result in fault relay being de-energized and
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fault condition being signaled to the controller.
Alarm relay usually configured de-energized and wired using the normally open circuit. i.e.,
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the signal circuit is shorted in the event of an alarm.
The EOL resistor (selected following control panel specification) enables the signal circuit to
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be monitored by the control panel for continuity.
Any loss of continuity in the signal circuit, including the disconnect of either the signal
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conductor, or the EOL resistor, or both will be detected by the controller and signal as a fault.
The termination of the alarm circuit conductor and the EOL resistor (or the next unit in a
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daisy chain of units) must be inserted into separate openings on the duplicate terminal block
of the NFPA 72 Connection Kit to comply with NFPA 72 requirements.
Honeywell®FS24X Plus™ | User Manual
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