Write Protection - Siemens SITRANS FUS060 Operating Instructions Manual

PROFIBUS communication
B.7 Write Protection
The EXTENSION_AVAILABLE bit indicates that there is further diagnostic information, essentially
details on the DIAGNOSIS message. This information is displayed locally. The messages related
to measured values are also transmitted with the measured values in the status byte (substatus).
Examples of telegrams with diagnostic data (Ext_Diag_Data)
Output state: all diagnostic bits are reset. When the "Temperature measurement error" (byte 5,
bit 0 set) and "Unreliable flow value" (byte 5, bit 5 set) events occur, the following diagnostic
data will result:
Diagnosis Byte No.
Value (hex)
Meaning
Output state: all diagnostic bits are reset. When the "EEPROM error" (byte 5, bit 4 set) and "Flow
outside sensor limits" (byte 5, bit 5 set) events occur, the following diagnostic data will result:
Diagnosis Byte No.
Value (hex)
Meaning
Output state: at least one diagnostic bit is set. As soon as all diagnostic messages are removed
the following diagnostic data result:
Diagnosis Byte No.
Value (hex)
Meaning
B.7

Write Protection

General write protection can be enabled with the WRITE_LOCKING PROFIBUS parameter. This
will then prevent any changes being made to parameters locally or using PROFIBUS.
• 0: General write protection enabled: Parameters cannot be edited. Exception: Output data
for totalizers (set, start) when they are transmitted cyclically (with the data exchange
service).
This write protection can be disabled locally by entering the code "2457" (menu 6.1), when
there is a continued communication failure.
• >0: General write protection disabled
Note
Parameter consistency between the device and control system is decisive for the correct
interpretation of the cyclical measured values. During operation the local write protection
(menu 6.2) or WRITE_LOCKING should therefore be enabled.
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Header
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Header
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Header
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Diagnosis
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Diagnosis
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Diagnosis
SITRANS FUS060 with PROFIBUS PA
Operating Instructions, 09/2021, A5E02225054-AD
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