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SIMATIC S7-400 / S7-400H / S7-400F /FH

Redundancy concept

Thread Starter: Agha77   Started: 8/29/2007 9:18 AM   Replies: 6

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  8/29/2007, 9:18 AM
Agha77
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Dear Sir,
I am very new on this forum thats why I do notknow how to post my issue. Thats why I am writing here. I have attached a control concept please verify that it will work or not if not then what is the other possible solution.

Thanks,


Agha


Attachment: control concept.JPG  (27 Downloads)



=== Edited by CS Moderator @ 30.08.2007 23:19 [GMT ] ===
new subject after splitting
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  8/30/2007, 9:52 PM
Late
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Hi,

The idea you have could work, please consider that with WinCC Flexible you could work without the repeaters. astonished

Please start with the button "New Post" a new thread... blink
Or start a new thead with the button "New Thread". cool



=== Edited by Late @ 30.08.2007 21:54 [GMT ] ===
new thread....

I hope that the answer will help, if you have still questions, don't hesitate to ask me.

All the best, Late
Never say never, think in solutions, not in trouble......
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  8/31/2007, 2:21 PM
monpara
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Dear Sir,

How can a TP be in two redundant profibus network? i think the idea mentioned must not work. if it works then how?

Please, reply.
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  9/1/2007, 9:10 AM
Dorftrottel
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Monpara,
I see this as more of communication network question.  Perhaps some of the experts from there may want to look at it?

In WinCC Flex, you can have multiple masters to a screen.  I believe the fact that the PLCs are redunant makes the special case that it is one master - that is, both PLCs act as one. 
I've never heard of connecting redundant Profibus network segments, as you have shown in your drawing.  I would expect you to have your screen connected via Y-Link, or connected to both controllers via the controller's MPI ports.

I personally would choose Profibus.  Since you're already running a network for your I/O, it's one less network to configure, and programming over it is a snap.

I agree with Late that you don't need a repeater, unless your network segment is too long.  You might then look at an OLM instead.

Ethernet presents a different issue (one I haven't tried to address, so I'm not sure if I am accurate here) -- you could easily connect to both controller CP443-1 modules, but the IP address cannot be the same, so you have to treat it as two separate masters. 

¿ If anyone out there has done it in Ethernet please add your 2¢. ?

Jim



=== Edited by UnimogMan @ 01.09.2007 09:15 [GMT ] ===
The PLC is not actually a master -- it is a peer to the screen. So in hardware configuration, you would not have the screen even listed in the Profibus network as an addressable entity.

Also, if you were to communicate via Ethernet, I think you would have to purchase 1 Softnet module per CPU.
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  9/2/2007, 7:30 PM
Late
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monpara wrote:
How can a TP be in two redundant profibus network? i think the idea mentioned must not work. if it works then how?


Dear Monpara,

Unimogman is right, with WinCC Flexible you can switch totogue both CPU's.

I would not place the display on the Profibus DP but on the MPI port, so it couldn't influence the I/O. blink
I hope that the answer will help, if you have still questions, don't hesitate to ask me.

All the best, Late
Never say never, think in solutions, not in trouble......
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  12/14/2007, 1:53 PM
GLOBETROTTER XL
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Hi,

I've got a same problem. So, there is redundant system in my project (S7414H). And there are 2 o.panels. I have use profibus. System is working normaly (redundant PLCs and o.panels together). Normaly, First PLC working second PLC waiting on standby and 2 panels working. When, first PLC to be stoped second PLC working and 2 panels working. But, when first PLC to be shutdown (power off) second PLC working. But 2 panels not working. Haw can i untie this problem?

Thanks already now.




=== Edited by GLOBETROTTER XL @ 14.12.2007 13:57 [GMT ] ===
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  12/15/2007, 4:45 PM
Late
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Hi,

Please place both panels on MPI together with the two H-CPUs (all other addresses of course). astonished 

When programming the panels with WinCC Flexible then you could switch the two connections from the panel. When you then also switch on the master CPU with the pannels, then both panels will be following the master... togue
I hope that the answer will help, if you have still questions, don't hesitate to ask me.

All the best, Late
Never say never, think in solutions, not in trouble......
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