Thanks for the reply!
If I understand this correctly, the application based controller redundancy, could serve as an alternative to having managed switches in my remote IO cabinets? Looks like a cost effective solution for bigger systems.
For my current project, with everything in the same enclosure, I just need a “light weight” redundant CPU installation, that is single fault tolerant until the IO.
I have not tested yet, but I believe I will be able to achieve this with my initial “network config” and a 750-362 Modbus Fieldbus Coupler.
The Ethernet Device in Codesys lets me configure network interface for both plcs. The plan is simply to monitor the the IO connection and switch over to PLC2 in case of an error.
