Lenze E84AYCET EtherCAT MCI module Uživatelský manuál stáhnout pdf (Strana 55)

Lenze · E84AYCET communication module (EtherCAT) · Communication Manual · DMS 5.0 EN · 05/2013 · TD17 55

7 Data transfer

7.1 EtherCAT-Frames

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7.1 EtherCAT-Frames

EtherCAT frames have the following structure:

Ethernet header

The Ethernet header contains the following information:

• Target address of the EtherCAT frame (destination)

• Source address of the EtherCAT frame (source)

• Type of the EtherCAT frame (EtherType = 0x88A4)

Ethernet data

The Ethernet data contain the following information:

• Length of the datagrams within the EtherCAT frame (Length)

• One reserved bit (Reserved)

• Type of the datagrams within the EtherCAT frame (Type)

• EtherCAT datagrams (Datagrams)

FCS

Checksum of the EtherCAT frame

Ethernet header Ethernet data FCS

48 bits 48 bits 16 bits 11 bits 1 bit 4 bits 48 ... 1498 bytes 32 bits

Destination Source EtherType Frame header Datagrams

Length Reserved Type

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 108 109

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Lenze E84AYCET EtherCAT MCI module Uživatelský manuál Strana 55