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interconnected two rings together in s7400H redundant netwrok

6/17/2014 9:48 AM	Rate (0)
nyi Posts: 7 Rating: (0)	Hi, We are using S7-400H plcs in our redundant profibus ring network. Accidently we've inter-conntected these two rings and experienced serveral problems like stop collecting data from instruments,etc.Is there any technical explanation about this issue? Rgds, nyi
nyi Posts: 7 Rating: (0)
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6/18/2014 2:52 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/17/2025 Posts: 3042 Rating: (1061)	Hello nyi I'd say thereare surely good reasons that you experienced network problems when “accidently” connecting the two Profibus Networks of a H system together (btw, how did you do this “accidently”?). Things to note are: - Each I/O station on the redundant Profibus Networks (e.g. ET200M, Y-Link, DP/PA Link) has a redundant Profibus Interface module (e.g .two IM153-2's) in it. - EachIM153-2 pair supports DP Slave redundancy (one is the active interface the other one is waiting to take over when needed), each IM153-2 in the pair is "configured" though and they both have thesame DP Slave address. By connecting the two Profibus Networks of theH system together, you'll end up with double Node addresses on the now "single" DP Network which ought to give you problems, so you are better off keeping the two Networks seperate. I hope this helps
	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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6/18/2014 8:53 PM	Rate (0)
nyi Posts: 7 Rating: (0)	Hi fritz, Thanks for your answer. We wrongly connected FO cable from OLM-1 to OLM-2 during the cable test. Rgds, Nyi
nyi Posts: 7 Rating: (0)
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