Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 102)

Cycle and reaction times
5.4 Calculating method for calculating the cycle/response time
CPU 31xC and CPU 31x, Technical data
5-20
Manual, Edition 08/2004, A5E00105475-05
Response time
Table 5-12 Calculating the response time
Shortest response time Longest response time
- Multiply the physical cycle time by factor 2.
Now add I/O delay. Now add the I/O delay plus the DP cycle times on
PROFIBUS-DP or the PROFINET IO update
times.
The result is the shortest response time. The result is the longest response time.
See also
Longest response time (Page 5-17)
Shortest response time (Page 5-16)
Calculating the cycle time (Page 5-5)
Cycle extension through component-based automation (CBA) (Page 5-11)