1 ethercat frame structure, Ethercat frame structure, Communication manual 8400 motec ethercat – Lenze E84DGFCT User Manual
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EDS84DMOTECAT EN 2.1 - 11/2012
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Communication manual 8400 motec EtherCAT®
Data transfer
EtherCAT frame structure
7.1
EtherCAT frame structure
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