A colleague of mine is building panels with physical relay logic and it's fairly labor intensive. Simple applications, maybe 10 relays. I encouraged him to use a "micro"/"brick" PLC aka Programmable Relay, like an Omron Zen, AD Click, or similar. He is hesitant because of heat. His panels are not climate controlled, they go into non-climate controlled spaces, and contain heat generating components. I don't know what temperature they get up to, but I'm trying to find the highest ambient temp rated brick PLC on the market, and if that isn't enough to budge him, then I'll just leave him alone about it. Any suggestions?