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Generally speaking, this depends on the use of your motor, whether it is for occasional or industrial use. Notice that Arduino is a simple microcontroller based circuit.I found here a nice post which explains the difference:
No Arduino is never going to replace PLCs. You ask why?
And at last if you design an Industrially robust Arduino based controller from scratch, keeping in mind all the industrial norms then again it would be nothing but a PLC that is slow at communication,has low processing power,is less reliable and understand Arduino language. It may be useful for really small industrial application like in situations where the application is not critical and reliability is not big a deal, But yet again its far from replacing PLCs.
I apologize this is not my specialist