Endress+Hauser Levelflex M FMP41C Operating Instructions Manual page 30

Operation
⇒
ENDRESS + HAUSER
– +
E
"
30
5.3.2 Unlocking of configuration mode
If an attempt is made to change parameters when the device is locked, the user is automatically
requested to unlock the device:
Function "unlock parameter" (0A4):
By entering the unlock parameter (on the display or via communication)
2457 = for PROFIBUS PA devices
the Levelflex is released for operation.
Hardware unlock:
O S
After pressing the , and
parameter
2457 = for PROFIBUS PA devices
⇓
⇓
Caution!
Changing certain parameters such as all sensor characteristics, for example, influences numerous
functions of the entire measuring system, particularly measuring accuracy. There is no need to
change these parameters under normal circumstances and consequently, they are protected by a
special code known only to the Endress+Hauser service organization.
Please contact Endress+Hauser if you have any questions.
F
keys at the same time, the user is asked to enter the unlock
O S
,
Please enter unlock code and confirm with
Levelflex M FMP41C PROFIBUS PA
F
and press simultaneous
Endress+Hauser
F