Emerson 3051S Specifikace stáhnout pdf (Strana 104)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

6-26

By default, the value of PLINE_Affect_PV_Status is “False”, meaning that 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 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 (see Table A-1). In AMS Device

Manager and the Field Communicator this parameter is labeled as “Software

Revision String.”

To restart the processor, the sequence depends on the host system:

For AMS Device Manager, right-click on the device, and select the menu

option Methods > Diagnostics > Master Reset. When prompted for the type of

reset, select “Processor” or “Restart Processor”.

On a Field Communicator, choose the option Resource Block > Diagnostic

Methods > Master Reset > Processor

On most other fieldbus hosts, this is done by setting the RESTART parameter

of the Resource block to the value: “Processor”

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 illustrates the basic detection sensitivity setting for PIL. In

general, a higher sensitivity means 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.

Figure 6-21. PIL Basic Detection

Sensitivities

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 239 240

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Emerson 3051S Specifikace Strana 104