Purpose: Control procedures of the pilot valves in the pneumatic block of the
positioner are counted and displayed in this parameter.
Description: The pneumatic block of the positioner pressurizes and depressurizes
the actuator. The pneumatic block contains two pilot valves. The char‐
acteristic service life of the pneumatic block depends on the load. This
amounts on average to approx. 200 million switching cycles for each of
the two pilot valves with symmetrical load. The number of control pro‐
cedures for the switching cycles serves to assess the switching fre‐
quency of the pneumatic block.
Counting procedure for single-acting actuators:
● Pressurize => 42.VENT1
● Depressurize => 43.VENT2
Counting procedure for double-acting actuators:
● Pressurize (Y2) / Depressurize (Y1) => 42.VENT1
● Depressurize (Y1) / Pressurize (Y2) => 43.VENT2
The value is written hourly into a nonvolatile memory.
12.2.4.28 Diagnostic value '44.VEN1R' / '45.VEN2R'
'44.VEN1R' Number of switching cycles of pilot valve 1, resettable
'45.VEN2R' Number of switching cycles of pilot valve 2, resettable
Display range: 0 ... 4.29E9
Purpose: Control procedures of the pilot valves in the pneumatic block of the
positioner are counted since the last time this parameter was reset, and
displayed here.
Description: Corresponds to the description for Diagnostic value '42.VENT1' /
'43.VENT2' (Page 268) referred to the diagnostics parameters
'VEN1R' and 'VEN2R' described here.
Diagnostics and troubleshooting
12.2 Diagnostics
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC 269
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