after setting all PIDs is it possible to have some sort of interface such as HMI or software to control (change values, programs, …) all my osPIDs?
it’s possible, but not without some work. you could, for example, run usb back from every unit, then individually talk to each one over serial, but I haven’t gotten around to explaining the comm protocol (it’s open, but still kind of confusing) so you’d be in for some work there.
My second question is, could I use osPID as a proportional 4-20ma pressure and temperature controller?
it’s in the pipeline, at the moment no.
It sound like what you really need is a low-end PLC. the amount of work connecting that to your system would likely be far less than using multiple osPIDs.
