Rockwell Automation T3419 ICS Regent Fire Detector Input - Manual (Page 10)

Fire Detector Input Modules (T3419)
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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 the 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