Lenze EtherCAT control technology - Manual (Page 37)

DMS 3.1 EN 01/2011 TD17
L
37
Control technology | EtherCAT communication manual
Synchronisation with "Distributed clocks"
Synchronous communication
6.1 Synchronous communication
The DC synchronisation provides for a phase-synchronous operation of master and slaves:
Within one bus cycle the setpoints are accepted and the actual values are detected in the
fieldbus at exactly the same time.
If the control (IPC) is synchronous to the distributed clocks, the data (actual values)
collected by the slave are assigned to the master at the end of the bus cycle and data from
the master (setpoints) are sent to the slaves for processing.
When the next DC synchronisation event occurs, the data are accepted.

Note!
State change and DC synchronisation for Servo Drives 9400 HighLine
During the state change from Operational to Pre-Operational, the DC
synchronisation is deactivated (C13883/C14883 = 0).
In order to re-activate the sync pulses adjust your PLC program in the following
way:
• Call the function block ResetAxisGroup.
– In this way, the EtherCAT fieldbus is reinitialised.
– The DC synchronisation is active again (C13883/C14883 = 1).