Hello dle@Diamond-MT, Welcome to the OptoForums!
Sometimes the "type" (e.g. I/O or Input/Output) can be confusing since you have user "inputs" and hardware "inputs" (like what's physically wired to your I/O Unit or the modules on your Opto 22 SNAP PAC rack -- like your SNAP-IDC5).
Do you physically have the hardware near you? Because the SNAP-IDC5 is an actual 4-channel input, which would be wired to something like a physical switch/button or some other signal coming into the SNAP I/O unit. (Where the terms "Input/Output" in this case indicate the direction of the actual physical signal coming into the Opto 22 hardware.)
But you mention something you're going to turn on (perhaps using a digital output like a SNAP-OAC or SNAP-ODC type module), to "preheat"?
Your I/O Units and the points on them there in your strategy tree there on the left in the picture (which you showed expanded) should match your physical hardware.
What are you using for the "screen"? PAC Display or maybe groov or some other non-Opto software? Because those software "buttons" etc. can be tied to a variety of types -- for example, they can be tied directly to the I/O points, or to some Variable that you'll look at in those condition blocks before doing something.
Your logic can see if an input point is on/off, or an output point is on/off, or a variable is certain value, or all kinds of things. If you haven't already checked out Chapter 4 of the User's Guide (under Help > Manual > User's Guide) I strongly recommend you check out that "Designing Your Strategy" which gives an example of a simple sprinkler system.
Because I notice your "flow" chart doesn't seem to flow there -- I think you're missing some connections. For example, after you make that first decision in the condition block, usually you'd want to have the False block also connect to the next condition, ditto the next condition block, then perhaps loop back to the top and delay for a bit then do all those checks again.
I hope that helps! Feel free to tell us a little more about your setup there, and even attach your strategy, if that would help (and is okay with your employer).