Lenze EMF2192IB - Manual (Page 38)

Data transfer
EtherCAT frame structure
7
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38 EDSMF2192IB EN 3.1
7.1 EtherCAT frame structure
EtherCAT frames have the following structure:
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
Ethernet header
The Ethernet header contains the following information:
ƒ Target address of the EtherCAT frame (destination)
ƒ Source address of the EtherCAT frame (source)
ƒ Type of EtherCAT frame (EtherType = 0x88A4)
Ethernet data
The Ethernet data contain the following information:
ƒ Length of the datagrams within the EtherCAT frame (length)
ƒ A reserved bit (reserved)
ƒ Type of datagrams within the EtherCAT frames (type)
ƒ EtherCAT datagrams (datagrams)
FCS
ƒ Checksum of the EtherCAT frame