Siemens CPU 31 Series Technical Data Manual page 98

Cycle and reaction times
5.2 Cycle time
The upper graphic displays
Incoming/outgoing remote connections
Cyclical interconnection via Ethernet
Acyclic interconnection via Ethernet
Interconnections from the PROFINET device
with proxy functionality to the PROFIBUS
devices
Interconnections of PROFIBUS devices
among each other
Additional marginal conditions
The maximum cycle load through communication in the measurement is 20 %.
The lower graphic shows that the OB1 cycle is influenced by increasing the cyclical
PROFINET interconnections to remote partners at PROFINET:
Base load through PROFIBUS devices
The 16 PROFIBUS devices with their interconnections among each other generate an
additional base load of up to 1,0 ms.
5-12
Quantity for CPU 315 and CPU 317
200, scan cycle rate: Intervals of 10
ms
100, scan cycle rate: Intervals of
500 ms
16 x 4
16 x 6
Quantity for CPU 319
300, scan cycle rate: Intervals of 10
ms
100, scan cycle rate: Intervals of 200
ms
16 x 4
16 x 6
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06