Emerson Rosemount 975UF Reference Manual page 21

Reference Manual
00809-0100-4977
• 0-20 mA (stepped) with HART
• Relays (alarm, fault, auxiliary)
• RS-485 Modbus
• Analog output - analog output proved ultra-fast detection to comply with twenty
millisecond detection
Table 1-4: Available Output Types
Output type
Alarm relay
Auxiliary relay
Fault relay
0-20 mA current output
RS-485
Analog output
1.5.6 Detector status
The possible detector function statuses are listed in the table below. Use HART
Modbus
Table 1-5: Detector Statuses
Status
Normal
BIT
Warning
Alarm
Latched alarm (optional)
Rosemount 975UF
®
Version
975UF- output configurations
1AXXXXX, 1RXXXXX, and
2RXXXXX
975UF - output configurations
2AXXXXX and 3AXXXXX
975UF - output configurations
1AXXXXX, 2AXXXXX, and
1RXXXXX
975UF - output configurations
1AXXXXX, 2AXXXXX, and
1RXXXXX
975UF - output configurations
3AXXXXX and 2RXXXXX
975UF - output configuration
1AXXXXX
975UF - output configurations
2AXXXXX and 3AXXXXX
All versions
All versions
®
to see a more detailed fault analysis.
Description
Normal operation.
Built-in test being performed.
Fire detected - changed to Warning (pre-alarm state).
Fire detected - changed to Fire Alarm state.
The alarm outputs remain latched on following detection of a fire
that has already been extinguished.
®
Introduction
June 2021
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
0 V during normal
5 V during detection
®
or
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