Siemens SIPART Series Operating Instructions Manual page 218

Alarm, error, and system messages
10.2 Diagnosis
40 VENT1 - Counter for pilot valve 1 and
41 VENT2 - Counter for pilot valve 2
Control procedures of the pilot valves in the pneumatic block of the positioner are counted
and displayed in these two parameters.
The pneumatic block of the positioner pressurizes and depressurizes the actuator. The
pneumatic block contains two pilot valves. The characteristic service life of the pneumatic
block depends on the load. On average it is approx. 200 million switching operations for
each of the two pilot valves with symmetrical load. The number of control procedures for the
switching operations serves to assess the switching frequency of the pneumatic block.
Counting procedure for single-acting actuators:
● Pressurize => 40 VENT1
● Depressurize => 41 VENT2
Counting procedure for double-acting actuators:
● Pressurize (Y2) / Depressurize (Y1) => 40 VENT1
● Depressurize (Y1) / Pressurize (Y2) => 41 VENT2
42 STORE - save maintenance data
Press the
data 7 to 10 and 20 to 27 is saved in the non-volatile memory as "data of last maintenance".
This diagnostics data contains selected values whose changes can give information about
mechanical wear and tear of the valve.
This function is normally operated through the PDM, menu command "Device-> Save
maintenance info". The data of the last maintenance operation can be compared with the
current data using SIMATIC PDM.
43 PRUP - Prediction open and
44 PRDN - Prediction closed
Refer to chapter "Optimizing the controller data (Page 110)"
216
button for at least 5 seconds in order to exit the save function. The diagnostics
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11