Siemens SIMATIC ET 200M Operating Instructions Manual page 170

Functions
8.6 Isochrone mode
2. Settings on the DP master system:
"Object properties" of the DP master > tab "General" > button "Properties" > tab
"Parameters" > button "Properties" > tab "network settings" > button "Options"
– Enabling equidistance on the DP master system
– Set the length of the equidistant DP cycle (max. 32 ms)
– Set "Times Ti and To same for all slaves" (causes a synchronization of the input / output
– The times Ti and To can be set separately.
170
data for the various DP slaves)
Recommendation: Adopt the standard settings for Ti and To.
Figure 8-22 Options dialog box
Note
With the button "Recalculation" you can calculate with STEP 7 a value for the
equidistant DP cycle, which takes into account the current PROFIBUS DP.
This value is then automatically entered in the fields "Equidistant DP cycle", "Time Ti
(...)" and "Time To (...)".
Operating Instructions, 04/2022, EWA-4NEB7806006-09
ET 200M