Configuring Hardware and Communication Connections STEP 7.pdf

3.9.2 What You Should Know About GSD Revisions
Configuring the Distributed I/O (DP)
The properties of DP slaves are provided to configuration tools by means of
GSD files.
Any extended functions for distributed I/O devices will have an effect on the
GSD specification, such as resulting in the definition of new keywords.
This results in their being different versions of the specification. The version of the
specification that a GSD file interacts with is called "GSD-Revision".
The GSD revision is contained as an obligatory keyword "GSD_Revision" in
GSD files as of GSD Revision 1. GSD files lacking this keyword will be thus be
interpreted by configuration tools as GSD Revision "0".
STEP 7 V5.1, Service Pack 3
This version of STEP 7 can interpret GSD files up to GSD Revision 4. This means
that you can also use the following new functions for DP slaves that are installed by
means of GSD (Revision 4):
• F-parameter assignment of submodules
• Diagnostic messages for interrupt blocks
• Constant mode (isochrone mode)
Special Features:
Please note that the optional package COM PROFISafe must be installed to edit Fparameters.
If this package is not installed, the parameters will not be visible and
thus cannot be changed. The F-parameters will, however, remain (default values
are taken from the GSD file or are values changed with COM PROFISafe) and will
be taken into account when generating a configuration (For further information, see
the documentation on distributed F-systems).
The following functions, although possible in GSD Revision 4, are not supported:
• A second parameter frame (extended parameter assignment)
• Subscriber functions (receive capability for direct data exchange/lateral
communication)
• Keywords for HART parameter assignment
Configuring Hardware and Communication Connections with STEP 7
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