Pil Operation; Pil Configuration In Eddl - Emerson Rosemount 3051S Series Reference Manual

Advanced Pressure Diagnostics
October 2016
PLINE_Learn_Sensitivity
The PLINE_Learn_Sensitivity parameters provide very specific adjustments to the sensitivity during the
learning phase. Most of the time, it is sufficient to use these default values:
Insufficient Dynamics Check: Ignores the insufficient dynamic check if not selected. Use only when

there is very low process noise. This could result in a plugged impulse line not being detected.
10%, 20%, and 30% Stdev. Change Check: Allows for 10, 20, or 30 percent change in standard deviation

while in the learning state. If this value is exceeded, the algorithm will stay in the verifying state until
the value is not exceeded.
Three or Six Sigma Mean Change Check: Allows for a three or six standard deviations change in the

mean while in the learning state. If this value is exceeded, algorithm will stay in the verifying state until
the value is not exceeded.
2% Mean Change Check: The mean value of the baseline calculation cannot vary more than 2 percent

during the learning or verifying states. If this value is exceeded, algorithm will stay in the verifying state
until the value is not exceeded.
You may want to increase or disable one or more of these learning sensitivity settings, if you find that the
PIL continues to stay in the verification phase.
6.5.5

PIL operation

During operation the PIL_Status indicates the current status of the algorithm. The valid values are:
Value
OK
Inactive
Learning
Verifying
Insufficient Dynamics
Bad PV Status
Not Licensed
Plugged Line
PIL also indicates the timestamp of the last detection of a plugged impulse line via these parameters:
PLINE_History_Timestamp
Timestamp when the last plugged impulse line was detected.
PLINE_History_Status
Indicates whether or not the PIL_History_Timestamp is available.
6.5.6

PIL configuration in EDDL

Host systems that support EDDL may use labels for the PIL configuration parameters that are slightly
different from the Fieldbus parameter names described previously in this section.
correspondence between the fieldbus parameter names used in this document, and the labels used in
EDDL hosts, such as AMS Device Manager.
96
Description
Algorithm is in the detection state, and no plugged impulse line is detected.
The algorithm is not enabled.
Algorithm is currently learning the process characteristics
Algorithm is comparing the learned baseline with the current process.
The process does not have enough dynamics to detect an impulse line plug
The sensor transducer status is Bad, therefore the algorithm is paused. Algorithm will
resume when a good or uncertain status returns.
The ADB is not currently purchased in this device.
Algorithm has detected a plugged line condition. This could be either one line or both
lines plugged for a DP transmitter, or the one impulse line plugged for a GP or AP
transmitter.
Reference Manual
00809-0200-4801, Rev DA
Table 6-4 shows the
Advanced Pressure Diagnostics