Profibus Communication
B.7 Locking operation
SITRANS F M TRANSMAG 2
Operating Instructions, 11/2009, A5E00102775-07
99
Examples for telegrams with diagnostic data (Ext_Diag_Data)
All diagnostic bits are reset in the initial state. When the "Tube empty" event occurs (byte 5,
bit 5 set), this gives the following diagnostic data:
Diagnosis Byte No.
1
2
3
4
5
6
7
8
Value (hex)
08
FE
01
01
20
00
00
80
Meaning
Header
Diagnosis
Initial state: all diagnostic bits are reset. With the occurrence of the events "Memory failure"
(byte 5, bit4) and "Flow outside sensor limits" (byte 5, bit 5), this gives the following
diagnostic data:
Diagnosis Byte No.
1
2
3
4
5
6
7
8
Value (hex)
08
FE
01
01
30
00
00
80
Meaning
Header
Diagnosis
Initial state: at least one diagnostic bit is set. As soon as all diagnostic messages are reset,
the following diagnostic data result:
Diagnosis Byte No.
1
2
3
4
5
6
7
8
Value (hex)
08
FE
01
02
00
00
00
80
Meaning
Header
Diagnosis
B.7
Locking operation
Write access via PROFIBUS is also possible with the local operation lock activated, (menus
6.1 and 6.2).
Operation via PROFIBUS can be locked in several steps:
● 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.