Communication Profibus Pa - Siemens SITRANS LG270 Operating Instructions Manual

11.2 Communication Profibus PA
Instrument master file
The instrument master file (GSD) contains the characteristic data of the Profibus PA instrument.
These data are, e.g. the permissible transmission rates as well as information on diagnostics values
and the format of the measured value output by the PA instrument.
A bitmap file is also provided for the Profibus network planning tool. This file is installed automati-
cally when the GSD file is integrated. The bitmap file is used for symbolic indication of the PA instru-
ment in the configuration tool.
ID number
Each Profibus instrument gets an unambiguous ident number (ID number) from the Profibus user
organisation (PNO). This ID number is also included in the name of the GSD file. Optionally in ad-
dition to this manufacturer-specific GSD file, PNO also provides a general so-called profile-specific
GSD file. If the general GSD file is used, the sensor must be set to the profile-specific ident number
via the DTM software. By default, the sensor operates with the manufacturer-specific ID number.
When using the instruments on a segment coupler SK-2 or SK-3, no special GSD files are required.
SI0181B9
The following table shows the instrument ID and the GSD names for the SITRANS LG sensor series.
Device name
SITRANS series LG
Cyclical data traffic
The master class 1 (e.g. PLC) cyclically reads out measured values from the sensor during opera-
tion. The below block diagram below shows which data can be accessed by the PLC.
80
Instrument ID
Siemens Instrument class in
profile 3.02
0x81B9 0x9702
SITRANS LG270 - Operating Instructions
GSD file name
Siemens Profile-specific
SI0181B9.GSD PA139702.GSD
PBD-51041506