7.5.6
Trending statistical values in control system
You may view and/or trend SPM Mean and Standard Deviation values in a Fieldbus host
system through the AI function blocks.
You may use an Analog Input (AI) block to read either the Mean or the Standard Deviation
from the SPM Blocks. To use the AI block to trend SPM data, set the CHANNEL parameter
to one of the following values:
Table 7-1: Valid SPM Channels for the AI Block
Channel
SPM variable
12
SPM mean
13
SPM standard deviation
for a complete listing of valid Channels for the AI Block.
Set the OUT_SCALE parameter to the engineering unit and range which are desired for the
mean and standard deviation output. For example, you can use the OUT_SCALE parameter
to convert mean and standard deviation to some other pressure unit. See
for additional details on setting the XD_SCALE, OUT_SCALE, and L_TYPE
parameters of the AI function block.
7.5.7
SPM configuration with EDDL
SPM configuration provides the capability to configure SPM for use in plugged line
detection, or other abnormal process conditions.
Menu navigation:
Configure>Guided Setup>Basic SPM Setup
for more information on SPM functions and uses.
Note
SPM is a factory only option, option code D01, and can’t be licensed/installed in the field.
An automated task procedure called a
Method
guides you through SPM setup. The basic
sequence of steps is:
Procedure
1. Enter the
Monitoring Cycle
.
The minimum monitoring time is one minute; three minutes is a typical monitoring
cycle.
2. Bypass Verification, Yes or No.
Emerson
™
recommends verification for applications where you have not done SPM
monitoring previously or where process changes may cause significant changes in
mean or standard deviation.
3. Enter the thresholds in percent.
a) The first threshold is the Mean Change that will trigger an alert.
b) The second threshold is the High Variation Limit that will trigger an alert.
Typical values are from 40 to 80 percent.
Reference Manual
Advanced pressure diagnostics
00809-0100-4774
July 2020
Reference Manual
129
Summary of Contents for Rosemount 3051 CF Series
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