Determining The Control Panel Power Supply Load - ADEMCO VISTA-128B Installation And Setup Gude
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VISTA-128B Installation and Setup Guide
Determining the Control Panel Power Supply Load
Use the following tables to calculate the total current for the Auxiliary Power, Alarm Output
and Polling Loop. In each table, multiply each device's standby and/or alarm current by the
number of units used.
1. Table 1: Total Polling Loop Current Draw
Refer to the instruction accompanying the device for the current draw. Refer to the
POLLING LOOP section for device restrictions for fire and burglary usage.
18-4
Polling Loop
The total current cannot exceed 128mA. If total load exceeds 128mA, then a 4297 loop
Extender Module can be used. This module is powered from the panel's auxiliary
power, and provides a separate polling loop output, which can support an additional
128mA load. Note that the total number of points connected to the panel cannot
exceed 119.
Current
# of Units
Polling Loop Subtotal
(terminals 24 & 25 – 128mA)
Total
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