Owner's manual

Fire Detector Input Modules (T7419)
2 Industrial Control Services
connect to redundant field sensors. In this dual module
configuration, a failed module can be removed and replaced
without affecting system operation.
The module requires connection to a field power supply
voltage, ranging from 15 to 40 VDC. This supply voltage is
internally regulated to power the fire detector field input
circuits.
Module Operation
A block diagram of a typical fire detector input module is
shown in Figure 1 .
Figure 1 . Block Diagram of Fire Detector Input Module.
A field power supply is connected to the fire detector input
module. The field power is internally regulated to 23.5 Vdc to
power the fire detector field inputs. Each input is b iased to