Owner's manual

FOUNDATION
TM
Fieldbus Blocks Manual
11-2
Learning Phase
In the learning phase of Statistical Process Monitoring, the algorithm
establishes a baseline of the mean and dynamics of a Statistical Process
Monitoring variable. The baseline data is compared to current data for
calculating any changes in mean or dynamics of the Statistical Process
Monitoring variables.
Monitoring Phase
The monitoring phase starts after a “Training Complete” message is
posted for the variable. The algorithm compares the current values to
the baseline values of the mean and standard deviation. During this
phase the algorithm computes the percent change in mean and
standard deviation to determine if the defined limits are violated.
Configuration Phase
The configuration phase is an inactive state or when the ADB mode is
OOS. In this phase, the block tags, limits for high variation, low
dynamics, and mean change detection can be set by the user.
TABLE 11-2. Statistical Process
Monitoring Parameters
Parameter Index Units Description
SPM_ACTIVE 815 NA Enables/disables the statistical process
monitoring alogrithm
SPM_MONITORING_CYCLE 816 min Baseline length and frequency of mean
and Stdev updates
SPM_BYPASS_VERIFICATIO
N
817 NA Enables/Disables Bypas of process
stability checks during learning
SPM1_BLOCK_TYPE 818 NA The function block type for the SPM
variable
SPM1_BLOCK_TAG 819 NA Block tag for the process variable
SPM1_PARAM_INDEX 820 NA OD parameter index for the block tag that
is entered.
SPM1_STATUS 821 NA Status of the SPM1 Statistical Process
Monitoring
SPM1_TIMESTAMP 822 time Timestamp of last SPM1 Statistical
process Monitoring status change
SPM1_USER_COMMAND 823 NA User control for the Statistical Process
Monitoring session.
SPM1_MEAN 824 NA Last mean of SPM1
SPM1_MEAN_CHANGE 825 % Percent change in SPM1 mean with
respect to baseline mean
SPM1_STDEV 826 NA Last Stdev of SPM1
SPM1_STDEV_CHANGE 827 % Change in SPM1 Stdev with respect to
baseline Stdev
SPM1_BASELINE_MEAN 828 NA Baseline Mean for SPM1
SPM1_BASELINE_STDEV 829 NA Baseline Stdev for SPM1
SPM1_MEAN_LIM 830 % Percent change in mean for SPM1 allowed
by user
SPM1_HIGH_VARIATION_LIM 831 % Percent increase in dynamics for SPM1
allowed by user
SPM1_LOW_DYNAMICS_LIM 832 % Percent decrease in dynamics for SPM1
allowed by user
SPM2_BLOCK_TYPE 833 NA The function block type for the SPM
variable
SPM2_BLOCK_TAG 834 NA Block tag for the process variable