Siemens SIMATIC ET 200AL - Constant Bus Cycle Time

Parameter assignment/addressing
3.7 Constant bus cycle time
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
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3.7
Constant bus cycle time
Constant bus cycle time
The DP master addresses its assigned DP slaves cyclically. S7 communication may cause
the intervals to vary. You can enable a "bus cycle with constant bus cycle time" to achieve
identical intervals. This ensures data transmission at the same (constant bus cycle time)
intervals.
Figure 3-7 Enabling a bus cycle with constant bus cycle time
Number of OPs/PGs/TDs at the PROFIBUS
Here you enter the number of devices that are not configured.