HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 36)

Configuration example
36
4.5 Isochrone mode parameter settings DPV2 slave
Double click on the slave device to open the properties window
and open the Isochronous Mode tab to change the settings.
Activate the clock synchronous operation by marking the check
box according to below.
The different time parameter can be set whereas the time base
parameters are controlled by the master. The individual DP slave
isochronous mode settings enable individual data sample time as
the TI can be set uniquely for each slave.