Endress+Hauser Levelflex M FMP 40 Operating Instructions Manual page 38

5 Operation
⇒
"
38
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 devices
the Levelflex is released for operation.
Hardware unlock:
O
After pressing the
and
unlock parameter
2457 = for PROFIBUS 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 conse-
quently, they are protected by a special code known only to the E+H service organiza-
tion. Please contact Endress+Hauser if you have any questions.
Levelflex M FMP 40 with PROFIBUS-PA
S F
keys at the same time, the user is asked to enter the
and
O
Please enter unlock code and confirm with
S F
and and press simultaneous
Endress+Hauser
F
.