Have you made the optional devices optional?
More details on how to set this up in the help:
https://help.codesys.com/webapp/_ecat_edt_slave_slave;product=core_EtherCAT_Configuration_Editor;version=3.5.16.0Attachments:
- Ethercat Optional.png (14.3 kB; image/png)
EtherCAT master initialization issues
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