Use arduino to make a profinet to ethernet ip converter

Hi all.. i have one idea..
I know it's exist Ethernet shield for arduino.
Does anybody have idea how it is possible create converter between profinet to ethernet/ip via arduino? I ask you because i have two PLC's..( AB use Ethernet/IP and Simatic S7 use Profinet ) and using arduino for convert between these plc would to be better for me than buy a original converter which is really really expensive for my mini project.
Many thanks.

Wow!, Great project!, And hard work to tranlate both protocols, it's very interesting

Jose: yeah, thanks.. and i know that protocols are different, and i believe that problem someone solve..
If this plc have a modbus protocols i don't have problem create communicatiom betwenn these plc's, but my AB processor not support a modbus protocols.. only df1 and ethernet/ip

Which PLC is the AB?

josemigu:
Which PLC is the AB?

compactlogix l32e