Is it possible to do online debugging of the C/C++ snap? Yes. You can e.g. run your code in or connect to the running process with the visual studio code programming environment.
Will there be a motion command to synchronously feed position commands to the axes? eg. WriteCyclicPosition. Or can this only be done through DataLayer real time access? When setting up an own motion kernel it would be the best way to write cyclically to the command value of the drive. Then no Rexroth motion package is needed.
What is the minimum ctrlX configuration needed for this...... Basic hardware with EtherCat app extension and the SDK (Software Development Kit)
PLC - Not required. But does this always have to be included? No.
Data Layer (Non Real Time) - ? Access via SDK (c/c++ functions) already possible.
Data Layer (Real Time) ? Access via SDK (c/c++ functions) in preparation. Release planned for the 20.11 milestone. If more information, trainings or early test version are needed please get in touch with the application support team.
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