I didn't know that Danfoss makes VFD's, but I do know that there is no integration with the Plus+1 environment. Plus+1 is targeted for mobile hydraulic machinery, usually far away from the land of VFD's. I'm sure the two Danfoss divisions have never met, let alone tried to integrate things.
I program in C as well as the Plus+1 environment, and making reliable custom CANOpen communications is actually pretty fast & easy in Plus+1. Drawing the 'code' to pack & unpack all the flags and data can certainly get tedious though.