Emerson Rosemount 975MR Reference Manual page 20

Introduction
August 2019
Table 1-9: Available Output Types
Output type
Alarm relay
Auxiliary relay
Fault relay
0-20 mA current output
RS-485
1.5.6 Detector status
The possible detector function statuses are listed in the table below. Use HART
Modbus
Table 1-10: Detector Statuses
Status
Normal
BIT
Warning
Alarm
Latched alarm (optional)
BIT fault
Fault
In each state, the detector activates different outputs, as specified in
20
Version
975MR- output configurations
1AXXXXX, 1RXXXXX, and
2RXXXXX
975MR - output configurations
2AXXXXX and 3AXXXXX
975MR - output configurations
1AXXXXX, 2AXXXXX, and
1RXXXXX
975MR - output configurations
1AXXXXX, 2AXXXXX, and
1RXXXXX
975MR - output configurations
3AXXXXX and 2RXXXXX
975MR - output configuration
1AXXXXX
975MR - output configurations
2AXXXXX and 3AXXXXX
All versions
®
to see a more detailed fault analysis.
Description
Normal operation.
Built-in test being performed.
Fire detected - changed to
Fire detected - changed to
The alarm outputs remain latched on following detection of a fire
that has already been extinguished.
A fault is detected during built-in test sequence or other electric
failure. The detector will continue to detect for fire.
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.
Reference Manual
00809-0100-4975
Detector status
The relay is N.O.
The relay is N.O. and N.C.
The relay is N.O.
The relay is N.C. energized.
The relay is N.O. energized.
Sink with the HART protocol
(can be changed to Source - see
Figure B-3, Figure B-4, and
Figure B-5).
Source with the HART protocol
Modbus protocol
®
(pre-alarm state).
Warning
state.
Fire Alarm
Table 1-11.
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