EB 8389 EN 25
Statistical information
4 Statistical information
The positioner records the set point w, valve
position x, drive signal y and set point devi-
ation e even while the process is running to
obtain information on the valve, actuator
and pneumatic air supply. The data com-
piled while the process is running are saved
and analyzed by the monitoring functions in
Statistical information. In addition, a back-
ground hysteresis test can detect any chang-
es in friction.
The monitoring functions in Statistical infor-
mation do not have any affect on the run-
ning process.
The measured data are analyzed after the
positioner has been in automatic mode or in
manual mode for an hour. However, the
analysis for the 'Cycle counter histogram'
and 'Trend of travel end position' start direct-
ly after the positioner changes to automatic
mode or manual mode.
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