6 synchronisation with "distributed clocks, Synchronisation with "distributed clocks – Lenze EtherCAT control technology User Manual
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Synchronisation with "Distributed clocks"
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DMS 3.1 EN 01/2011 TD17
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Synchronisation with "Distributed clocks"
The "Distributed clocks" (DC) function enables an exact time adjustment for applications
where several auxiliary axes carry out a coordinated movement at the same time. The data
is accepted synchronously with the PLC program. With the DC synchronisation, all slaves
are synchronised with a reference clock, called the "DC master".
The settings for the DC synchronisation are made with the »EtherCAT Configurator«.
Adjusting task cycle time and DC cycle time
Setting the DC synchronisation with the »EtherCAT Configurator«
Note!
• Motion applications always require DC synchronisation.
• DC synchronisation can also be used for Logic applications.
• Some slaves do not support the DC functionality.
– To be able to use the DC function, the first slave connected to the EtherCAT
master (IPC) must be DC-master-capable.
– In the arrangement of the slaves following then, DC-capable and non-DC-
capable devices can be mixed.
• The first EtherCAT node connected to the IPC must be the DC master which
provides the other EtherCAT nodes (including the IPC) with the exact time.