Beckhoff EL6601 Documentation page 23

◦ FastEthernet/100 MBit and 1 GBit are supported
◦ This Ethernet interface is configured in the local TwinCAT System Manager as a real-time
Ethernet device
• 1..n configured publishers - each publisher is sent as an independent Ethernet frame and can therefore
contain a maximum of 1500 bytes
• 1..n publisher variables contained therein for linking with the task/PLC
◦ For each publisher variable the user data and diagnostic data [} 22] are transferred
On the receiver side the configuration is mirrored.
The EL66xx can also process publishers and subscribers which are frame data
• Max. 32 publishers and/or subscribers
• For each transmit direction (publisher or subscriber) the following maxima apply:
◦ all publishers: 1024 bytes total data [} 22]
◦ all subscribers: 1024 bytes total data [} 22]
Update of the terminal
The values above apply for a EL6601/6614-0000-0018. Version -0017 only supports a maximum of
300 bytes per publisher/subscriber. If a -0017 terminal is used, the values specified above can be
achieved by an update to revision -0018. Please contact our technical support.
With appropriate EtherCAT cycle time and depending on the scale and number of the publishers/subscribers
configured in the EL66xx, real-time cycle times down to 500 µs or below are possible.
Typical throughput values for EL6601, FW08, Rev. EL6601-0000-0018 are
• 1 publisher with 1000 bytes, 1 subscriber with 1000 bytes, simultaneous bidirectional operation: 2 ms
• 1 publisher with 100 bytes, 1 subscriber with 100 bytes, simultaneous bidirectional operation: 300 µs
Both characteristic values were determined with this https://infosys.beckhoff.com/content/1033/
el6601_el6614/Resources/zip/2349555083.zip
System Manager file.
The EL6601 is used as a sample to explain configuration as publisher or subscriber for network variables.
The dialogs under TwinCAT 2.10 and TwinCAT 2.11 here are slightly different.
The following descriptions of the dialogs of the EL6601 in the TwinCAT System Manager can be applied
equally to the EL6614.
Note regarding the term total data
For each data direction the EL6601/EL6614 from Rev. -0018 can transfer a maximum of 1024 byte total
data. The total data consist of the user data (e.g. a UDINT) and the diagnostic data for the EL66xx.
Formula for number of diagnostic data bytes
• Publisher direction: 2 + ((number of publishers) * 2)
• Subscriber direction: 2 + ((number of subscriber variables) * 4)
If the configured data quantity exceeds 1024 bytes, a corresponding message window appears when
activation is attempted:
EL6601, EL6614
. TwinCAT from version 2.11 is required for the *.tsm
Version: 4.2
Product overview
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