17
1.5.5
Output Signals
Outputs are available according to the default configuration or the wiring options selected
for the 40/40I IR3 Detector. Determine the outputs for your model according to table 7
The detector incorporates several types of output suitable to different control systems:
•
0-20mA (stepped) with HART
•
Relays (Alarm, Fault, Auxiliary)
•
RS-485 Modbus
Table 7: Available Output Types
Output Type
Version
Detector Status
40/40I – Options 1XXXX,
4XXXX, 5XXXX
The relay is N.C.
Alarm relay
40/40I – Options 2XXXX,
3XXXX
The relay is N.O. and N.C.
Auxiliary relay
40/40I – Options 4XXXX
and 5XXXX
The relay is N.O.
40/40I – Options 1XXXX,
2XXXX, 4XXXX
The relay is N.C. energized
Fault relay
40/40I – Options 3XXXX,
5XXXX
The relay is N.O. energized
40/40I – Option 1XXXX
SINK Option, with HART
protocol (can be changed to
Source – see Figure 10)
0-20mA current
output
40/40I – Options 2XXXX
and 3XXXX
SOURCE Option with HART
protocol
RS-485
All versions
Modbus Protocol
1.5.6
Detector Status
The possible detector function statuses are listed in Table 8. A more detailed fault analysis
can be seen via HART or RS485.
Table 8: Detector Status
Status
Description
Normal
Normal operation.
BIT
Built-In-Test being performed.
Warning
Fire detected - changed to Warning (pre-alarm state).
Alarm
Fire detected - changed to Fire Alarm state.
Latched Alarm
(Optional)
The alarm outputs remain latched on following detection of a fire
that has already been extinguished.
BIT Fault
A fault is detected during BIT sequence or other electric failure.
The detector will continue to detect for fire.
Fault
A fault is detected when the power supply is too low or due to a
software fault or electrical failure. The detector will
NOT
detect
fire in this condition.
In each state, the detector activates different outputs, as specified in table 9.
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