Hello, In fact, Index 16#1605 and 16#1A05 has the Fixed content flags. This means you cannot add new PDO content under this index. What you need to do is check the option for the 16#1615 and 16#1A15 index ，then you can add new PDO content under these index, like this: Then re-download the IO configuration, and the EtherCAT master state will be successfully switched to the op state.😉 In addition, you need to pay attention to the conversion of function codes and index addresses.
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