Endress+Hauser Levelflex M FMP40 Operating Instructions Manual page 46

Operation
⇒
ENDRESS + HAUSER
– +
E
"
46
5.3.2 Unlocking of configuration mode
If an attempt is made to change parameters when the instrument is locked, the user is automatically
requested to unlock the instrument:
"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
and keys at the same time, the user is asked to enter the unlock
O
and
Please enter unlock code and confirm with
Levelflex M FMP40 with PROFIBUS PA
S F
and press simultaneous
Endress + Hauser
F
.