Operation
7.5 Communication via PROFIBUS DP
SINAMICS DCP
226 Operating Instructions, 09/2019, A5E34382853K
7.5.3.2 PROFIBUS interface in operation
Generic Station Description
A generic station description file clearly and completely defines the properties of a
PROFIBUS slave.
The GSD files can be found:
● On the Internet. For the link, see "Preface (Page 3)"
● On the memory card in the \\SIEMENS\SINAMICS\DATA\CFG directory.
The integration of a GSD file in HW Config is described in the SIMATIC documentation.
PROFIBUS component suppliers can provide their own bus configuration tool. The
description of the respective bus configuration tool is described in the relevant
documentation.
Device identification
Identification for individual slaves facilitates diagnostics and provides an overview of the
nodes on the PROFIBUS.
The information for each slave is stored in the following CU-specific parameter:
r0964[0...6] device identification
Bus terminating resistor and shielding
Reliable data transmission via PROFIBUS depends, amongst other things, on the setting of
the bus terminating resistors and the shielding of the PROFIBUS cables.
● Bus terminating resistor
The bus terminating resistors in the PROFIBUS plugs must be set as follows:
– First and last nodes in the line: Switch on terminating resistor
– Other nodes in the line: Switch off terminating resistor
● Shielding of the PROFIBUS cables
The cable shield must be connected in the plug through a large surface area at both
ends. See also Chapter "PROFIBUS connection (Page 223)".
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