Lenze E84AYCET EtherCAT MCI module Manual de usuario descargar pdf (Pagina 54)

7 Data transfer

54 Lenze · E84AYCET communication module (EtherCAT) · Communication Manual · DMS 5.0 EN · 05/2013 · TD17

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7 Data transfer

Compared with conventional Ethernet, the collision-free transfer of frames on the fieldbus makes

EtherCAT a real-time capable bus system.

Communication is always initiated by the EtherCAT master, e.g. a Lenze Controller. A frame sent by

the master passes through all EtherCAT slaves. The last slave of the communication chain sends the

frame back to the EtherCAT master. On the way back, the frame is directly sent to the master,

without being processed in the slaves.

EtherCAT transmits data in so-called "EtherCAT frames". The EtherCAT nodes only extract the data

intended for them while the EtherCAT frame passes through the device. At the same time output

data are inserted into the frame while it passes through the device. Read and write accesses are only

executed on a small section of the entire EtherCAT frame – the datagrams. Therefore it is not

necessary to receive the complete frame before it can be processed. Processing starts as soon as

possible.

EtherCAT transmits process data, parameter data, configuration data, and diagnostic data between

the EtherCAT master and the inverters (slaves) that are part of the fieldbus. The data are

transmitted via corresponding communication channels depending on their time-critical behaviour

(see Process data transfer

( 59) / Parameter data transfer ( 68)).

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Lenze E84AYCET EtherCAT MCI module Manual de usuario Pagina 54