6
Commissioning
6.5
Synchronisation with "Distributed clocks" (DC)
36
Lenze · E94AYCET communication module (EtherCAT®) · Communication Manual · DMS 10.2 EN · 11/2018 · TD06
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6.5
Synchronisation with "Distributed clocks" (DC)
The "Distributed clocks" (DC) functionality enables exact time synchronisation for applications in
which several axes perform a coordinated movement simultaneously.
Data are incorporated
synchronously with the PLC program. During DC synchronisation, all slaves are synchronised with a
reference clock, the so-called "DC master".
[6-1]
Example: "Distributed clocks" in the EtherCAT bus system with Lenze Controller 3231 C
The DC synchronisation is set with the EtherCAT configuration software (e.g. »PLC Designer«,
»TwinCAT«).
Note!
• DC synchronisation is absolutely required for Motion applications.
• DC synchronisation can also be used for Logic applications.
• Not all slaves support the DC functionality.
• On order to be able to use the DC functionality, the first slave connected to the
EtherCAT master (e.g. Lenze Controller) must have
DC master capability
.
When further slaves are connected, DC-capable and non-DC-capable devices can be
mixed.
• The first EtherCAT slave after the Lenze Controller must be the
DC master
that
supplies the other EtherCAT devices (incl. the controller) with the exact time.
"Controller-based Automation EtherCAT" communication manual
Here you'll find some detailed information relating to the EtherCAT configuration with
the Lenze »PLC Designer«.
