The CODESYS documentation is written by developers, for developers. It assumes you know what a PLC cycle is. It does not assume you know how to find Plc_PRG . Problem: Your EtherCAT master is not going into OP (Operational) state.
Google "CODESYS EtherCAT not working." Right approach: Open the CODESYS Fieldbus Manual → Search "EtherCAT Master State Machine" → Read the table of status bits ( wState ). codesys 3.5 manual
If you have ever opened CODESYS 3.5 for the first time, you know the feeling: a mix of excitement (powerful, IEC 61131-3 programming!) and mild panic (where is everything?). The CODESYS documentation is written by developers, for