Owner's manual

FOUNDATION
TM
Fieldbus Blocks Manual
11-4
PLUGGED IMPULSE LINE
DETECTION
Plugged Impulse Line Detection is designed to be used in a continuous
liquid flow application that is controlled by a set point.
Learning Phase
In the learning phase, the algorithm establishes a baseline of the
process mean and process dynamics. The base line data is used to
compare current process data when determining a plugged impulse
line.
Detection Phase
The detection phase begins after a “Training Complete” message is
posed by the learning phase. To determine if the impulse lines are
plugged., the algorithm compares the baseline process variable mean to
the standard deviation.
Configuration Phase
The configuration phase is an inactive state and the user can determine
the affect on the PV status.
Once the configuration is valid, the message
“Valid Configuration is posted and the configuration phase stops. The
configuration phase is also used to set up the parameters controlling
the sensitivity, thresholds, length of leading and detecting phases.
SPM4_USER_COMMAND 868 NA User control for the Statistical Process
Monitoring session
SPM4_MEAN 869 NA Last mean of SPM4
SPM4_MEAN_CHANGE 870 % Percent change in SPM4 mean with
respect to baseline mean
SPM4_STDEV 871 NA Last Stdev of SPM4
SPM4_STDEV_CHANGE 872 % Change in SPM4 Stdev with respect to
baseline Stdev
SPM4_BASELINE_MEAN 873 NA Baseline mean for SPM4
SPM4_BASELINE_STDEV 874 NA Baseline Stdev for SPM4
SPM4_MEAN_LM 875 % Percent change in mean for SPM4 allowed
by user
SPM4_HIGH_VARIATION_LIM 876 % Percent increase in dynamics for SPM4
allowed by user
SPM4_LOW_DYNAMICS_LIM 877 % Percent decrease in dynamics for SPM4
allowed by user
Parameter Index Units Description