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Reference Manual
00809-0200-4801, Rev BA
April 2007
3-21
Rosemount 3051S
ADVANCED
DIAGNOSTICS
TRANSDUCER BLOCK
(ADB)
The Advanced Diagnostics Function Block is a licensable block. It will be
licensed on a new transmitter if the D01 option is ordered or can be licensed
in the field via a licensing code. Please contact your local sales person on
how to acquire a license for a field upgrade.
The Advanced Diagnostics Block (ADB) transducer block contains two
different algorithms, Plugged Impulse Line Detection and Statistical Process
Monitoring. Configuration, learning, verifying, and detection are the different
phases to the Plugged Impulse Line and Statistical Process Monitoring.
ADB Parameters For a complete listing of the Advanced Diagnostic Block (ADB) parameters
see “Advanced Diagnostics Transducer Block (ADB)” on page A-13.
Plugged Impulse Line
Detection (PIL)
The PIL algorithm can detect a plugged impulse line of a gage pressure (GP)
or absolute pressure (AP) transmitter. For Differential pressure (DP)
transmitters it can detect either single impulse line or both impulse lines
plugged. This is done by comparing process dynamics the algorithm has
“Learned” to a set of “Detection” parameters that are configured by the user.
Some of the parameter names may appear differently depending on your host
system. Configuration learning, detection are the three different phases to the
Plugged Impulse Line.
IMPORTANT
Running the Advanced Diagnostics Block could affect other block execution
times. We recommend the device be configured as a basic device versus a
Link Master device if this is a concern.
Configuration Phase
The configuration phase is an inactive state. The configuration phase is used
to set up the parameters controlling the sensitivity, thresholds, affect on
PV_STATUS, length of the learning and detecting phases.
Learning Phase
The learning phase begins after a valid configuration is present. In the
learning phase, the algorithm establishes a baseline of the process mean and
process dynamics. This base line data is used to compare current process
data to the base line when in the “Detection Phase”.
Verify Phase
The verifying phase is similar to the learning phase. It calculates a baseline
value which is then compared to the learning phase baseline value. This is
done to ensure a steady process before the detection phase. The amount of
acceptable deviation between the two values is set up in
PLINE_Learn_Sensitivity.
Detection Phase
The detection phase begins after the learning phase is complete. To
determine if the impulse lines are plugged, the algorithm compares the most
recent mean and standard deviation of the process to the baseline mean and
standard deviation.