Diagnostic Value '21.P0 - Potentiometer Value Of Lower Endstop (0%)' / '22.P100 - Potentiometer Value Of Upper Endstop (100%) - Siemens SIPART PS2 Operating Instructions Manual

10.2.4.19 Diagnostic value '21.P0 - Potentiometer value of lower endstop (0%)' / '22.P100 -
Potentiometer value of upper endstop (100%)'
Display range:
Requirement 1 -
read values
Purpose 1
Requirement 2 -
change values
Purpose 2:
SIPART PS2 with and without HART
Operating Instructions, 05/2017, A5E00074631-AC
● NO
● 0.0 ... 100.0
'NO': Changing the low or upper endstop is not possible in the current
state of the control valve. Initialize the positioner again.
The positioner is initialized.
Read values
You can use the P0 and P100 parameters to read the values for the
lower endstop (0%) and the upper endstop (100%) of the position
measurement as determined during the automatic initialization. The
values of manually approached end positions are applicable for man‐
ual initialization.
● The positioner is initialized and in manual mode (MAN) or
automatic mode (AUT).
● The current position of the actuator is within the range -10 to
+10% of the lower endstop (P0).
● The current position of the actuator is within the range 90 to 110%
of the upper endstop (P100).
Change values
You can use these two parameters to change the lower endstop (P0)
and the upper endstop (P100).
Since initialization is not usually carried out under process condi‐
tions, the values for the lower endstop (P0) and the upper endstop
(P100) may change when the process is started. These changes
may result from temperature changes with the associated thermal
expansion of the material. If the Monitoring of lower endstop 'F.\
\ZERO' (Page 180) and Monitoring the upper endstop 'G.\\OPEN'
(Page 181) parameters are active, the thresholds set in these two
parameters can be exceeded as a result of thermal expansion. An
error message is output in the display.
The process-dependent thermal expansion may represent the nor‐
mal state in your application. You do not wish to receive an error
message as a result of this thermal expansion. Therefore reset the
'P0' and/or 'P100' parameters after the process-dependent thermal
expansion has had its complete effect on the control valve. The pro‐
cedure is described in the following.
Alarm, error, and system messages
10.2 Diagnostics
207