Chapter 3 Programming
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3.16.6 Wiring
(1) Cable
Use category 5 or higher STP (Shielded Twisted Pair) cable.
(2) Switch (Hub)
Standard switch (hub) is not allowed to use in EtherCAT network. If necessary, use a special device like EtherCAT
hub (CU1128) sold by Beckhoff.
Please note that using various Ethernet based communication (EtherCAT, Modbus-TCP, NVL, Gateway) at the
same time will limit the communication performance.
3.16.7 Important restrictions
Byte-swapping
If slave units of 16/32/64-bit channels are used, be sure to configure “Enabled 2” in [Always update variables] in
each slave mapping dialog, otherwise all I/O data are byte-swapped. This “Enabled 2” in [Always update variables]
has been available since CODESYS V3.5 SP5 or newer version.
Even if “Enabled 2” is configured, it is not effective for following three cases.
(1) ARRAY type variables
As a countermeasure, Please put a variable to each single channel instead of ARRAY.
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