Siemens CPU 31 Series Technical Data Manual page 97

Extending the OB1 cycle time
The OB1 cycle is extended by
• Increasing the number of PROFINET interconnections,
• Increasing the number of remote partners,
• Increasing the data volume and
• Incrasing the transfer frequency
The following graphic shows the configuration that was used for the measurements.
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
Note
The use of CBA with cyclical PROFINET interconnections requires the use of switches to
maintain the performance data. 100-Mbit full-duplex operation is mandatory with cyclical
PROFINET interconnections.
Cycle and reaction times
5.2 Cycle time
5-11