think paying ~500 euro or more is way overdone for such an application.
What kind of tricks can be used to protect the relays and measurement?
Keep it clean and keep it cool. Heat and dirt are the enemies.
Well the programming work shouldn't be a problem. I made plenty of systems, but with the difference that the hardware is usuaally already chosen. And in 300.000 euro systems or even more, of course a 3000 euro PLC is peanuts and a logical choice. In this case it's a relative small & simple system. So spending half of the money only on a superb computer while an old Casio calculator with 2 buttons can do the math. Taking the safe route with a PLC is not a problem, but it hurts if you discover the whole system could be done 500 euro cheaper... you get the point. But yes, as Udo said, I don't have much knowledge about electronics. So just wanted to check if it would be wise to even consider Arduino as an option. From what I read here, I conclude that for industrial purposes, unless you really know what you're doing, we should be very careful when taking the Microcontroller route. Thus, at least first have some better research about the environment & usage of this device. Then look how the controller can be protected, and if that is still worth the price.Thank you all for the advises!
* Intelligent LCD (Demmel, anyone experience?)
Realtime Clock (for log & maintenance messageS)these are not in by default, right?
can be partially programmed so that you don't have to do all store/execute all graphics on the Arduino.
It is a touchscreen though, so you are probably paying more for something we don't really want.
Anyone knows such displays with good old robust buttons?
I wonder if all those components(LCD, Logger, XBee) fit without problems on a Mega.
getting a new one (same model) is usually not much of a problem. Would that also count for Microcontrollers,