I've had this idea in mind for a while. I was thinking of designing a cheap PLC similar (or almost identical) to Schneider's Zelio, Siemens Logo, Omron's Zen... the hardware would be relatively simple but could be useful for home projects and small businesses. I saw a few similar projects online but non of them really convinced me.
My question would be:
How eager are you to get a simple, basic, open-hardware, open-software PLC?
What features would you like it to have?
Some quick thoughts on tentative specs:
4 analog outputs
(possibly) ladder programming from the device itself using an LCD and few buttons as the interface
USB-to-serial PC connectivity for programming, debugging and monitoring
additional flash memory for data logging etc