Siemens SITRANS F M Intermag 2, Руководство по эксплуатации

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Operation
5-52
SITRANS FM Intermag 2 Flow Transmitter
Operating Manual - A5E00102775-03
5.4.4 Locking operation
Write access via PROFIBUS is also possible with the local operation
lock activated (personal PIN, menus
6.1 and 6.2 ).
Operation via PROFIBUS can be locked in several steps:
S
General write protection:
This can be activated with the PROFIBUS parameter
”WRITE_LOCKING” and has the result that all parameter changes
are rejected locally or by PROFIBUS.
0: The general write protection has been activated. Parameters
cannot be written generally.
Exception: output data for totalizers (set, start) when they are
transmitted cyclically (with the ”data-exchange” service).
This write protection can be deactivated by the local operation in the
case of a permanent communication failure by entering the code
”2457” (menu item
6.1 )
>0: The general write protection is switched off.
.
Note !
The consistency in the parameters between the device and the
control system is decisive for correct interpretation of the cyclic
measured values. In current operation, the local operating lock
(menu
6.2 ) or ”WRITE_LOCKING” should therefore be
activated by PROFIBUS.
S
Hardware write protection:
A write protection by hardware components is not implemented; the
PROFIBUS parameter ”HW_WRITE_PROTECTION” is not
significant.
S
Locking of local operation
Local operation can be locked by the PROFIBUS parameter
”LOCAL_OP_ENABLE”:
0: The local operation is completely locked, the last valid display
state is retained.
In the event of a communication failure of more than 30 s, the local
operation lock is cancelled automatically until communication is
recovered.
1: Local operation is released.
This function may be restricted under certain circumstances by write
protection ”WRITE_LOCKING” or local operation lock (personal
PIN, menus
6.1 and 6.2 ).