Siemens Simatic S7-1500R

Cyclic program execution
3.2 Cycle time
Cycle and response times
28 Function Manual, 10/2018, A5E03461504-AD
Reference
Additional information on the "RT_INFO" instruction is available in the STEP 7 online help.
3.2.2
Influences on the cycle time
3.2.2.1
Update time for process image partitions
Estimating update time for process image partitions
The update time of the process image partitions depends on the volume of assigned central
and distributed I/O module data.
You can estimate the update time using the following formula:
Base load for process image update
+
Number of words in the process image x copy time for central I/O
+
Number of words in the process image via DP x copy time for PROFIBUS I/O
+
Number of words in the process image via PROFINET x copy time for PROFINET I/O
__________________________________________________________________________________
=
Update time of the process image partition