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| 6/20/2009 6:06 PM | |
Joined: 1/29/2006 Last visit: 3/10/2025 Posts: 449 Rating:
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Dear experts! I am planning my first medium scale network. Therefore, I would like to hear your opinion about proposed sollution. It is about central water treatment plant for a small city. Configuration is as follows: - 1 Central plant (with CPU 315-2PN/DP, and main SCADA) - 8 pumping stations (each with CPU313C-2DP and CP343-1 lean) - 1 remote control center with SCADA. See the proposed scheme, which is attached. This scheme also shows appr. position of each station. The distance between extreme end stations (f.e. between Central Plant and Remote control center or between Central Plant and RBDV-D8) is between 8 and 10 km. The first logical choise for this configuration would be a mixed line - star topologie. My first question is: Can CP343-1 LEAN be used as ETH switch in line/star topology? In CA01, it says, that CP343-1 LEAN has "integrated 2 port real-timeswitch". But I can not find the use of this CP in any of examples in NET manuals! If CP343-1 LEAN has this ability, then I have a further question. Can it also be used in RING topology? (in Manual it says, that "ring topology is a line topology, which has it´s ends connected together"). Of course, there must be at least 1 redundancy manager (or somethink like thata;I believe, X204-LD can do the job....). If this is true, I would rather use a ring topology, because the costs of equipment do not rise so much (between line and ring), as advantages of redundant ring. Any opinion or tip will be highly appreciated! sincerely yours! uel123 AttachmentEthernet Optical Ring V1.pdf (314 Downloads) |
| 6/21/2009 12:21 PM | |
Joined: 10/7/2005 Last visit: 3/17/2025 Posts: 3042 Rating:
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Dear uel123 Firstly:YES you can use the inbuilt two port switch of the CP341-1 LEAN in a line and star topology. Secondly: NO, you can NOT use it as part of a ring topology. For that you would need a CP that supports so called Media redundancy protocol (MRP) like the CP343-1 Advanced. Attached is a picture from the IK PI catalogue (ED 2009) that shows an example of this. Thirdly: An X204-2 LD can NOT be used as a Ring Manager (it does not have Ring Manager capabilty). All SCALANCE X20x-IRT switcheshave Ring Manager functionality (don't worry about the fact that are also IRT capable). Have a look at this thread which quite extensively deals with the issues of what gear is suitableforring structures. Lastly: Check what lenght offibre cable you really require between each station. Up to 3km is supportedwithout the need to go for an LD version. Should this be sufficient, youmay be better offimplementing a Ring with one X204-2 IRT (as the Ring Manager) andall others as X204-2 for example. Should you however need the long distance between stations, consider using theX204-2 LD version instead. I havn't check the prices but remember that one X204-2 LDwould replace two X101 LD's that you currently have foreseen per station (you'd use only one port of the CP341 in this case, theX204 is now part of the ring). On that note, if you put X204's per station,it may be worthile to consider getting rid of the CP343 altogether and instead upgrade the CPU toa PN version (again I haven't check the prices, but this may be another way to save money). I hope this helps and good luck with your project Cheers Fritz |
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| 6/21/2009 2:09 PM | |
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Joined: 1/29/2006 Last visit: 3/10/2025 Posts: 449 Rating:
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Dear Fritz! Thank you very much for your answer. If I am allowed, i would like to take our debate a little bit longer..... 1. Use of "LD" optical swithes: Proposed optical cable will be composed with 24 optical fibers (non Siemens). For my application, only the minimum number of fibers will be used. Other will be used for classic Ethernet connection (IP telephone, User´s intranet,...)between "Remote control center" and "Central plant". The distance will be appr 8 km, therefore i assume, that complete cable (with all 24 fibres) will be single mode, 10 micrometers,.... . Therefore, I decided to use "LD" optical equipment, because I am not sure, if classical opticalperipheral equipment(for multi-mode, 50/65micrometer) can do the yob with single- mode fibers. 2. Use of X204-2 LD as a ring manager: On this link (http://support.automation.siemens.com/WW/view/en/23498599)there is a table, where it says, that this switch can be used as a ring manager and not as standby manager (allthough, that I don´t know the meaning of standby manager. 3. You are wright about the prices: X101-LD costs 600,00 EUR, and X204-2LD costs 1.700,00 EUR. The difference is not so big (1.200,00 EUR : 1.700,00 EUR). If I understand this thing properly, I can realise my redundant ring with use of 1 X204-2LD instead of 2 X101-LD on each station; in that case, I can also use low-cost CP343-1 LEAN on each field station (?), because X204-2 LD is approwed member of optical ring? In this case, there is only a problem of ring manager. Thanks again for your help! uel123 |
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| 6/21/2009 3:38 PM | |
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Joined: 10/7/2005 Last visit: 3/17/2025 Posts: 3042 Rating:
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Dear uel123 here is my feedback to your questions: 1.) I'm still not too sure if 8-10 km is the overal combined lenght of ALL fibre optic cables in your ring OR the distance you need to span between two stations? Irespectively, if you opt for 10 micrometer cable then you need switches whose FO ports support this in which case you need to go for "LD" type switches. 2.) I thank you for this and stand corrected (Siemens has added the Ring Manager functionalityto newer X204-2 LD and I shall avoid consulting old manuals in the future). |
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| 6/21/2009 4:25 PM | |
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Joined: 1/29/2006 Last visit: 3/10/2025 Posts: 449 Rating:
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Hi, Fritz! Now, it is all clear. I will go on with configuration with X204-2 LD in all stations. Thanks again! uel123 |
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