Siemens SIPART PS2 Operating Instructions Manual page 29

Figure 3-11
Small control deviations do not send control pulses in the zone. This takes place in the so-
called adaptive deadband. The deadband adaptation and the continuous adaptation of
minimum pulse lengths in "Automatic" mode ensure the best possible control accuracy with
the smallest number of operating cycles. The start parameters are determined during the
initialization phase and stored in the non-volatile memory. The most important start
parameters are:
● The real actuator travel with end positions
● Travel times
● The deadband size
The number of fault messages, changes in direction, and the number of total strokes are
continuously determined during operation and saved every 15 minutes. You can read and
document these parameters using communication programs such as SIMATIC PDM and
AMS. By comparing the old values with the current ones, you can draw conclusions about
the wear and tear of the valve. You can use the diagnostics function for this.
SIPART PS2 with and without HART
Operating Instructions, 02/2016, A5E00074631-AB
Functional principle of five-point controller
Description
3.4 Mode of operation
29