I'm going to assume it's me you're asking about the kflop, and not Jonathan?

What exactly you need depends on what other Inputs and Outputs are required.
For my mill, I've got a spreadsheet where I've listed all Inputs/Outputs I'd like, then mapped them to what's avaiable on the Kflop/Kanalog. I know I'll be pushing certain Inputs/Outpus onto MODbus, as the KFlop doesn't have enough Inputs/Outputs.

Before you make any final decisions, I'd recommend making up a list of what Inputs/Outputs you'll need, then seeing what options are suitable. If you want to PM me your email, I'll send you over the spreadsheet I've started for my mill.

I've got the KFlop/Kanalog, but I've had far too many other projects to do, and the cold weather is putting me of spending any more time that required in the workshop! I might get started on the control cabinet next month..