Configuration Of Detection Sensitivity - Emerson Rosemount 3051S Series Reference Manual

Advanced Pressure Diagnostics
October 2016
By default, the value of PLINE_Affect_PV_Status is "False", meaning the quality of the pressure
measurement will not be changed if PIL detects a plugged impulse line. Setting this parameter to True
will cause the status quality to change to "Uncertain" when a plugged impulse line is detected.
Depending upon the DCS configuration, the "Uncertain" quality could be visible to the operator, or it
could affect the control logic.
If you ever want to re-start the PIL learning process, set the parameter:
PLINE_Relearn = Relearn
Note for Rosemount 3051S Software Version 1.11.x (x =5, 6, or 9)
For software revision 1.11.x, after the PIL has been enabled, it is necessary to restart the processor. The
software revision can be seen via the parameter RB_SFTWR_REV_ALL the Resource Block
page
Revision String."
To restart the processor, the sequence depends on the host system.
AMS Device Manager
1. Right click on the device.
2. Select the Methods menu option.
3. Select Diagnostics.
4. Select Master Reset.
5. When prompted for the type of reset, select Processor or Restart Processor.
Field Communicator
1. Select the Resource Block option.
2. Select Diagnostic Methods.
3. Select Master Reset.
4. Select Processor.
On most other fieldbus hosts, this is done by setting the RESTART parameter of the Resource Block to
Processor.
6.5.2

Configuration of detection sensitivity

Although a few impulse line applications can be configured just by enabling the PIL, the majority of
applications will require configuring the detection sensitivity (that is, the upper and/or lower limit on the
standard deviation at which an impulse line plug will be detected).
Figure 6-21
that the PIL is more sensitive to changes in the process dynamics, while a lower sensitivity means that the
PIL is less sensitive to process dynamics changes.
92
199). In AMS Device Manager and the Field Communicator this parameter is labeled as "Software
illustrates the basic detection sensitivity setting for PIL. In general, a higher sensitivity means
Reference Manual
00809-0200-4801, Rev DA
(Table C-1 on
Advanced Pressure Diagnostics