Alarm Inputs 1 through 4 are signals from the fire detection system (CIE). The Alarm Reset Input cancels all active Alarms in the system while the Alarm Silence Input maintains all active Alarms but causes Emergency Messages to be silenced. Refer to CI-1 and LSI-16(e) manuals for more information.
Inputs are asserted by a positive transition from Low to High, with Low ranging from 0 to 8V DC and High ranging from 12-24V DC with respect to the ‘Isolated Ground’ connection. This transition is preferably derived from a dry contact closure to a remote 12V-24V DC source, or to the CI-1 24V DC Reference Out (100mA limit).
Assertion can be achieved via momentary or latching closures, however if a latching closure is used the system uses a last takes precedence approach. For example if A1 is latched ON then followed with RESET latched on, the Alarm status will clear and A1 must be toggled off before it can be activated again. Momentary contacts are typically best suited.
