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FireNET 4127 I & O Manual v1.90 UL
5.14 SOM-A / SOM-AI Supervised Class A Output Module
The SOM-A / SOM-AI provides a supervised 24VDC polarity reversing Class A output
on the SLC loop. This module is most commonly used for audible and visual signaling
appliances or for triggering a remote notification appliance circuit power expander. The
SOM-AI includes built-in short circuit isolation (SCI).
In addition to the SLC circuit the SOM-A / SOM-AI requires a 24 VDC auxiliary input
voltage. This voltage may be connected to the FN-4127 control panel terminals 18 and
19 (500ma max) or to any other UL listed fire alarm power supply providing 24 VDC.
The supervised voltage output of the SOM-A / SOM-AI is rated at 2.0A maximum.
Connect the SOM-AI to the FN-4127 control panel as shown in Figure 5.14.1. Note that
the SLC connections for the SOM-A are like the SOM; there is only one S+ and one
SC- terminal. Refer to the installation instructions included with the SOM-A / SOM-AI
for more detailed wiring and installation instructions. Take care to install wiring so that
faults on installation conductors do not affect more than one notification zone. The
SOM-A / SOM-AI is suitable for use only with non-synchronized audible devices.
Figure 5.14.1 SOM-AI Supervised Output Module Detail
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