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SIPROTEC Relays on Profibus with S7-300 SWR

Created by: Navnag at: 2/4/2012 3:09 PM (5 Replies)

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2/4/2012 3:09 PM	Rate (0)
Navnag Platinum Expert Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating: (308)	Hello All We need to connect SIPROTEC Relays on Profibus to a S7-300R ( CPU 315-2 PN/DPs with SoftWare Redundancy. As has been discussed many times in this Forum, SWR systems do not support Y-Link Modules ( Though no clear reason has ever been given ), unless there are any new developments that I may not be aware of. Therefore we plan toconnect the relays with the Two CPUs through RS485 repeaters Similar to the solutionprovided in FAQ below for connecting HMIs toS7-400H Systems. : http://support.automation.siemens.com/WW/view/en/23842653 Now Unlike normal Profibus Slaves ( Drives , ET200S etc ) the SIPROTEK Relays are not "Controlled Slaves" of the S7 system in the sense that the S7 system Mostly Reads data cyclically from the relays, besides occasionally issuing some commands. The Worst possible Scenario that we can imagine is that the communication from CPU to relays would be interrupted during the period of changeover of the CPUs and switching of the Repeaters.and establishment of Profibus connection from the new Master CPU to the Relays. If our application permits this, then are there any other problems that might arise in implementing this solution. If anyone can suggest a better solution ( Other than going in for S7-400H - Our Budget does not permit that ), that is most welcome. Thanks Navnag
	There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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2/8/2012 5:48 PM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Dear Navnag, what is for sure is that you will lose the connection to the SIPROTEC Slave at least for a short while. Even if you set down the GAP Factor to a very low value... and the switch over of the Repeater you mentioned would work... it takes some time to reestablish this communication. So if your process allows this... try it. What I am sure about is ... that this is not a system to be run with a peripheral... with HMI this is something slightly different. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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2/14/2012 12:43 PM	Rate (0)
Navnag Platinum Expert Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating: (308)	Dear J_Bell Thanks for your thoughts on this. I was thinking on the same lines. I am counting on two two main assumptions : a) The changeover from Master to Standby CPU would be a RARE occurance. I do not know what may be the mean time bettween changeovers, but it may be in years.It will occur only in case of CPU failure /Bus Failure. b) The Siprotec Relays are being used primarily for Transmitting Relay Data to SCADA I understand that communication with relays will fail during the changeover period. If this is the only consequence then it may be acceptable to customer. Thanks Navnag
	There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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2/15/2012 11:47 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 10/4/2024 Posts: 3024 Rating: (1054)	Hello Navnag I only know about the devices below and haven't used either of them yet, so I can't say how they perform in real life, but you may be interest in them nonethelss as a possible solution foryour particular "challenge": COMSOFT's PRS ABB's RLM01 I hope this helps and good luck with your project.
	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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2/15/2012 12:23 PM	Rate (0)
Navnag Platinum Expert Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating: (308)	Dear Fritz Thanks for the advise. Would Definitely like to explore these options. Can anuone share their experience on use of these units ? Cheers Navnag
	There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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4/10/2013 2:11 PM	Rate (0)
Anit Kumar Posts: 153 Rating: (2)	I have tested COMSOFT's PRS with swr redundent system, these were the results: - during the switch over b/w cpus , we are lossing communication with the n/w attached with PRS. - I remember , my stand by CPU is always showing BF i found not feasible , so i drop the idea...
Anit Kumar Posts: 153 Rating: (2)
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