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4 The Lenze automation system with EtherCAT

4.1 Brief description of EtherCAT

Lenze · Controller-based Automation · EtherCAT® Communication Manual · DMS 6.4 EN · 04/2014 · TD17

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4.1.2.2 Addressing of the slaves

The EtherCAT system uses two types of addressing for the slaves:

Auto-increment addressing

The auto-increment addressing is used by the master during the initialisation phase of the fieldbus.

When the "Pre-Operational" state has been reached, the master uses the Fixed-Address addressing.

Fixed-address addressing

With the fixed-address addressing, the slaves are addressed via the station address distributed by

the master during the start-up phase.

In the EtherCAT bus topology in »PLC Designer«, the first slave is given the address ’1001’, the

second the address ’1002’ and so on. The EtherCAT addresses cannot be changed.

The EtherCAT address of the master is ’0’. Access to master objects with the address ’0’ is possible.

Example

The first slave of a configuration is given the following addresses ...

• ’0’ due to the automatic incrementation procedure;

• ’1001’ due to the fixed addressing procedure.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 204 205

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Lenze EtherCAT Controller-based Automation Manuale Utente Pagina 22