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Arduino is cheap and heaps of resources on the web.
I guess you will be controlling things like relays, RS232, RS422/485, reading sensors info, limit switches etc, all of which will need to be interfaced to the Arduino or PLC. I know there are Ascom Arduino projects out there.
Either way, it's what you interface with it that counts. I only have experience with Arduino, PIC micros and AMX controllers but if you are a PLC guru, then you will already know what you have for options as far as interfacing.
Reliability would be very crucial I would say.
Either way, great fun!
Cheers,
Damien.
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