I've been thinking about buying a house (I keep moving so buying didn't make sense, but I might have found a position that might be long term.) and I can't imagine not converting my house to be run with PLCs and IIOT. What are you doing with the PLCs?
I have several lights in security mode - auto on and off at times that vary every day, and change based on the average sunset time.
I monitor the temperatures in the house, outdoors and the crawl space under the bedrooms
I monitor the household power and log evry power failure and restoration (the PLC is on a decent size UPS)
I monitor and run a back-up charger for a solar battery bank, monitor the charge current, usage current, battery voltage and incoming voltage
I control 7 outdoor outlets. Mostly for Chtistmas and Halloween lights, but have a battery charger mode if I have to put a charger on a car overnight, a slow cooker mode for one that powers a slow cooker for the times programmed.
I monitor the metered power for the air conditioner compressor (that is turned off a lot at high use times) and switch the compressor over to the more costly normal power to keep the house decent, with a compressor saver mode to not restart the compressor within 6 minutes after it last ran to not start when full of liquid
I monitor the runtime hours of the furnace burner, blower, and air conditioning
A flood detector that shuts off the incoming water until it is reset
Monitor the incoming water pressure and log outages
A fire detection system - smoke and heat detectors
Motion detectors, currently disabled because the dog and cats seem to want to move when I'm not home
Plans for adding thermocouples for hot water tank, furnace chambers, dryer vent duct, refrigerator, and more
Plans on flow sensors for the toilet line, washing machine lines, and outside hose bibs with shutoffs if run too long
Plans on monitoring doors and fence gates for closed and locked, with latches to lock the gates securely. Maybe solenoids to lock the doors also
Plans on monitoring the incoming water pH, flow, and pressure differential across the water filter/softener setup, maybe salt level in the softener