Sorry, I had really missed your point.
The Beckhoff documentation is indeed not up-to-date. In the meantime, the Beckhoff CX2033 got a firmware update so it does work with the CX2100-0904. That is what you will get when ordering a CX2033 from BCI.
What I meant is that the BCI docs could be a bit more clear about this. The UPS is not integrated in the CX2033 but in the CX2100-0904.
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