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Lenze · I/O system 1000 · Reference Manual · DMS 5.0 EN · 09/2016 · TD17
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7
EtherCAT communication
7.1
About EtherCAT
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7.1.1
EtherCAT frame
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)
Ethernet data
The Ethernet data contain the following information:
• Length of the datagrams within the EtherCAT frame (length)
• One reserved bit
• Type of the datagrams within the EtherCAT frame (type)
• 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
header
Datagrams
Length
Reserved
Type