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AC500 High availability - connect other CS31 device

Hi,

I have a very old Procontic CS31 system that communicates with 2 frequency converters by CS31 line. I am going to exchange that system with AC500 High availability system thus I need to use CS31 line for redundancy control of CPUs by CI590 module. I found in the documentation that it's not possible to use/mix other CS31 slaves with CI590. How can I connect the other CS31 device (e.g. frequency converter) to both CPUs? Consider that there is no option to exchange communication of frequency converter from CS31 to other type of communication. Thanks for you help.