Power Supply - Emerson Rosemount 3051S Series Reference Manual

Advanced HART Diagnostic Suite
October 2018
Severe changes in the electrical loop may inhibit HART Communication or the ability to reach alarm
values. Therefore, Emerson cannot absolutely warrant or guarantee that the correct Failure Alarm level
(HIGH or LOW) can be read by the host system at the time of annunciation.
Resistance
This value is the calculated resistance of the electrical loop (in Ohms) measured during the Characterize
Loop procedure. Changes in the resistance may occur due to changes in the physical condition of the
loop installation. Baseline and Previous Baselines can be compared to see how much resistance has
changed over time.

Power Supply

This value is the calculated power supply voltage of the electrical loop (in Volts) measured during the
Characterize Loop procedure. Changes in this value may occur due to degraded performance of the
power supply. Baseline and Previous Baselines can be compared to see how much the power supply has
changed over time.
Characterization Time Stamp
This is the time stamp or elapsed time of the loop characterization event. All time values are non-volatile
and displayed in the following format: yy:dd:hh:mm:ss (years:days:hours:minutes:seconds).
Characterize Loop
Loop characterization must be initiated when the transmitter is first installed or when electrical loop
characteristics have been intentionally altered. Examples include more transmitters being added onto
the loop, modified power supply level or loop resistance of the system, changing the terminal block on
the transmitter, or adding the Wireless 775 THUM Adapter to the transmitter. Another case of required
re-characterization is if the diagnostic electronics are taken out of an existing Rosemount 3051S
Transmitter and placed in a new Rosemount 3051S installed on a different loop.
Note
The Loop Integrity diagnostic is not recommended for transmitters operating in HART Burst Mode (fixed
current mode) or multidrop.
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Reference Manual
00809-0100-4801, Rev HA
Advanced HART Diagnostic Suite