Siemens SIMOTION Function Manual page 35

For synchronization of the internal cycle clocks of the SIMOTION device and the programs
running in the SynchronousTasks, see section: "Synchronization of the cycle clocks of the
SIMOTION device".
Synchronization of the cycle clocks of the SIMOTION device
The following differences apply as regards synchronization of the SIMOTION device - which
features internal cycle clocks (e.g. Servo, IPO, IPO2) - with the programs running in the
SynchronousTasks:
● In PROFIBUS DP:
● For PROFINET IO:
Basic Functions for Modular Machines
Function Manual, 04/2014
Synchronizing SIMOTION devices with a higher-level bus cycle clock
3.3 Synchronization of a SIMOTION device with an isochronous DP master interface
Synchronization of the SIMOTION device and synchronization of the isochronous DP
master interface run at the same time.
Therefore, the following applies to both the device cycle clocks (e.g. Servo, IPO, IPO2) and
the programs running in SynchronousTasks: Only after successful synchronization of the
isochronous DP master interfaces are they synchronous with the higher-level bus cycle
clock (see also Cycle clock generation and synchronization in PROFIBUS DP (Page 26)).
Synchronization of the SIMOTION device with the higher-level bus cycle clock is automatic.
Therefore, the following applies to both the device cycle clocks (e.g. Servo, IPO, IPO2) and
the programs running in SynchronousTasks: They are already synchronous with the
received bus cycle clock once successful automatic synchronization of the interface
receiving the higher-level bus cycle clock is complete (see also Cycle clock generation and
synchronization in PROFINET IO (Page 28)).
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