I wont to connect HMI panel (i dont know type yet) to PLC (CPU 314-2DP) which is set to be the Master (it must be becouse of others slaves on PLC)....My question is will that work ???... becouse of nature of PLC as master.... WillI be able to control PLC from HMI panel or i must change my concept....??

And no I can't use MPIs becouse they are allredy used for other jobs

I relly hope U can help me, becouse I'm new with this whole thing