GE Fanuc PLC’s, I dislike Siemens anything (overpriced and unreliable) and Allen Bradly rapes you on hardware and then twice more for the programming software - GE PLC’s are available on eBay all day long and I have Proficy already.
I am not yet sure If I will be using thermocouple input cards or analog input cards. If I find sensors/transducers with a 0-10V output or straight up variable resistance I will use the analog cards, else I’ll have to source a thermocouple input card.
I like the analog because I have a couple of 16 channel analog cards which will accept 0-10VDC or 4-20ma current. I am also looking for some vacuum transducers (saw some somewhere, cannot remember where) and an airflow sensor (thinking about using older modified automotive analog MAF sensors).
I want to know the temp, vacuum, and airflow at all of the various stages of the unit, so that the PLC can alert me when there are “abnormal” conditions present in the system.
I’m also liking water level sensors (still thinking on a tar level sensor - little more difficult) and some automated drain valves for Michigan’s cold winters (trying to prevent freezing and of course, kneeling or lying down in slop).
I definitely have a lot of work to do!