Manual

Fire Detector Input Modules (T3419)
10 Industrial Control Services
Matching the Input Thresholds to Specific
Field Devices
The Fire Detector input module has a input characteristic
load - line that is illustrated in Figure 4 .
Figure 4 . Input Characteristics of the Fire Detector Input
This figure plots the input voltage versus loop current. Along
the curve, several points are plotted which indicate t he loop
resistance that produces the load - line characteristics. When
applying the module to specific fire detectors, the operating
points for Fire Detector - Normal, Fire Detector - Alarm, Open