For my work, we have to control a 50 kW power-station and coordinate different components, including some safety-critical sensors, reactions, etc.
I am considering to use a PLC as a master controller. We have about
- 30-50 digital I/O (with 10-15 special safety elements)
- 10-20 analog I/O
The details are not yet completely clear. Nevertheless I was looking for a PLC solution for it, and I don't have prior experience with PLCs myself (but I do with microcontrollers). At first, I looked into the Wago 750/753 Series, which offer some modularity. But then, people often recommend the Siemens S7 PLCs.
This time, it is to build a prototype, but we might expect 5-40 products delivered if everything runs fine.
What is the experience with the Wago PLCs, and how do they compare with the Siemens? And what would an alternative be?