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Routning of ProfiNet

11/7/2012 7:07 PM	Rate (0)
Anton S Posts: 11 Rating: (0)	Hi I need to connect a PLC, S7-315-2 PN/DP, to a Danfoss VLT(frequency converter) with ProfiNet Interface. The frequency converter acts in the HW configuration as an IO-Device. I can set up the configuration and make it work when I have the PLC and the frequency converter within the same subnet. But the two devices are to be placed within two different subnet, and therefore I need to do a routning between the two subnet. But when I try to configure the setup in the HW config. i’m not allowed to place the two devices within two different subnet I have been studying the contents of this threat, but I am not able to configure a router in the setup for the frequency converter in the HW configuration. I Hope that somebody are able to help me. Thanks in advance.
Anton S Posts: 11 Rating: (0)
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11/9/2012 11:05 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/20/2025 Posts: 3042 Rating: (1061)	Hello Anton S I'm afraid to say that Profinet I/O data is NOT routeable and the I/O Controller and all associated I/O devices MUST be within the same subnet. The reason for this is that cyclic Profinet I/O data completely bypassess the TCP/IP layers (Layer 3 and 4 of the ISO/OSI model) to create an efficient and lean protocol without uneccessary overhead. Without these Layers in the protcol though, the I/O data communication is MAC address based and you loose the ability to route. It's a small price to pay though and I personally would not want tohave routers in a time criticalI/O network anyhow. I hope this helps and you'll find more info in the SIMATIC PROFINET System Description
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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