HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 26)

Absolute encoder installation
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3.3 Shielding philosophy
To achieve the highest possible noise immunity and resistance
against other EMI related disturbances the bus and power supply
cables shall always be shielded. The screen should be connected
to ground on both ends of the cable. In certain cases
compensation current might flow over the screen. Therefore a
potential compensation wire is recommended.
3.4 GSD file
In order to start using an absolute encoder with PROFIBUS DP
interface, a device description file needs to be downloaded and
imported to the configuration software.
The device description file is called a Generic Station Description
file and contains the necessary implementation parameters
needed for a PROFIBUS DP device.
Available GSD files can be downloaded from
www.heidenhain.com.
GSD file
Gateway functionality GSD file
Absolute encoder PROFIBUS DPV2 Enc_0aaa
Table 9 Available GSD file for DPV2 encoder
The GSD data is saved in the PROFIBUS master and transferred
once to the encoder when the system is powered on. If the
encoder has been started with one GSD file and a new GSD file
with a different ID-number shall be used, the encoder needs to be
restarted before it can use the new GSD file.