Hello,
Danfoss "Redundant CAN" is an old solution that is obsolete and we no longer support it. I guess you have seen it in some APIs for some units, DP6xx maybe?
My knowledge regarding this is that I have heard about it.
I found this document on danfoss.com,
https://assets.danfoss.com/documents/65648/AQ152886481376en-000302.pdf Again, this document is just "historical" and nothing we promote.
Have a nice day.