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Setting of redundant IP for AC 800M PLC

I need to set redundant IP address for AC800M PLC. I followed the steps given in the manual. So far i didnt arrive at the result. Is there any special setting to be made while doing 'IPConfig'. I checked with RNRP where it said secondary network address is not available. Please let me know on how to set secondary IP address for AC800M PLC.

Thanks,