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4 synchronisation with "distributed clocks" (dc), Synchronisation with "distributed clocks" (dc), 6commissioning – Lenze E94AYCET User Manual

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Lenze · E94AYCET communication module (EtherCAT®) · Communication Manual · DMS 9.0 EN · 02/2014 · TD17

35

6

Commissioning

6.4

Synchronisation with "Distributed Clocks" (DC)

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6.4

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 nodes (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«.