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Profibus Communication
B.9 Device Database File (GSD)
B.8
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.
Hardware Write Protection
If write protection with hardware components is not set, the HW_WRITE_PROTECTION PROFIBUS
parameter will not be of any significance.
Calibration data
Access to calibration data and special service parameters can only be enabled by entering a
factory code. Improper changes to these data can cause the device to seriously malfunction.
Locking local operation
Local operation can be locked using the LOCAL_OP_ENABLE PROFIBUS parameter:
• 0: Local operation is disabled completely and the last valid display status remains. If
communication fails for longer than 30 s, the local lock will be disabled automatically until
communication is restored.
• 1: Local operation is enabled and if necessary limited with the WRITE_LOCKING write
protection or a customer code.
B.9
Device Database File (GSD)
The device database file (GSD) is used to configure the format and order of the cyclic data. The
acyclic parameter "IDENT_NUMBER_SELECTOR" must be set to select the GSD (0 = profile GSD, 1
= manufacturer-specific GSD = factory setting). This can also be done on the local operating unit
under menu item 4.1.2.
The GSD lists all permissible identifiers for every measured value (= module). They can be freely
combined with the restriction that only one identifier may be used per module and the order of
the identifiers must be the same as the order of modules. At least one measured value must be
requested, i.e. the number of identifiers must be at least 1 and 4 at the most.
114
TRANSMAG 2 with MAG 911/E
Operating Instructions, 03/2021, A5E00102775-AC
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