HEIDENHAIN PROFIBUS-DP (DPV0) - Manual (Page 25)

Absolute encoder installation
25
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
Absolute encoders with PROFIBUS can be configured and
parameterized corresponding to the requirements of the user.
When the system is started, the PROFIBUS devices are set and
configured in DDLM_Set_Prm mode, i.e. the encoder class set by
means of the GSD file in the configuration tool and the operating
parameters are transferred to the respective slave.
Available GSD files can be downloaded from
www.heidenhain.com.
GSD file
Gateway functionality GSD file
Absolute encoder PROFIBUS DPV0 Enc_A401
Table 9 Available GSD file for DPV0 encoders
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.
After the configuration and parameter data have been
received, the gateway enters normal operation with cyclic
data transfer i.e. “DDLM_Data_Exchange mode”.