Appendix
EL72x1-901x 249Version: 1.9
In (A) TwinCAT 2.11 shows that the Online CoE directory is currently displayed. If this is not the case, the
Online directory can be loaded via the Online option in Advanced Settings (B) and double-clicking on
AllObjects.
9.3.3 Updating controller firmware *.efw
CoE directory
The Online CoE directory is managed by the controller and stored in a dedicated EEPROM, which
is generally not changed during a firmware update.
Switch to the Online tab to update the controller firmware of a slave, see Fig. Firmware Update.
Fig.226: Firmware Update
Proceed as follows, unless instructed otherwise by Beckhoff support. Valid for TwinCAT2 and 3 as
EtherCAT master.
• Switch TwinCAT system to ConfigMode/FreeRun with cycle time >= 1 ms (default in ConfigMode is 4
ms). A FW-Update during real time operation is not recommended.
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