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| 5/17/2010 2:42 PM | |
Joined: 3/21/2006 Last visit: 11/1/2024 Posts: 10229 Rating:
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Hello, Max. nodes are 32. If you want to add more you should use repaeter. Look at What should you watch out for when using the RS485 repeater in PROFIBUS and MPI bus systems? Best regards, Hristo Mihalev |
| 5/17/2010 3:14 PM | |||||
Joined: 9/27/2006 Last visit: 11/18/2024 Posts: 12296 Rating:
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Hello simaticmanager; Just to add a few details to Umencho's posting, since your basic question was if you were able to connect up to 200 nodes to the CPU 414-3 PN/DP over Proifibus (on copper cable): - the max. number of nodes that a Profibus network can support is 125, less if you are using HMI or SCADA stations; Umencho's mention of 32 nodes is the maximum number in a single segment, after that you must use a repeater (at least one, see below). - a segment uses 2 definitions that must be true at the same time: a maximum number of 32 nodes, and the longest distance allowed at the speed you are using : 100 m at 12 MB, 1000 m at 187,5 kB or less. Once one of those limits is reacjhed you must use a repeater to extend the bus. - you are allowed a maximum of 9 repeaters in a single Profibus network. - on the CPU 414-3 PN/DP you can have up to 125 slave nodes on the integrated MPI/DP port; if you want a second bus (to get the allowable 200+ nodes you mentionned), then you will need either a IF964 module in the 3rd port of the CPU, or a CP 443-5 Extended processor, to act as a Profibus master. See the links below for descriptions and part numbers; the link will show you manuals as well:
Hope this helps, Daniel Chartier |
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Last edited by: dchartier at: 5/17/2010 3:15 PM |
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| 5/17/2010 3:16 PM | |
Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating:
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Hello simaticmanager,
The 414-3 PN/DP has 3 interfaces, 2 of them can be used as DP master. The firstone can be used either for MPI or for Profibus. Itcan handle maximum of 32 DPV0 slaves with address area of 2KB I/O. Thethird interfaceisbooked forpluggable interface module IF 964-DP which is a DP master that can handle 96 DPV1 slaves with address area of 6KB I/O. However, this CPU can have up to 10 DP masters (CP443-5 Extended). Then each of these CPs can handle 125 DPV1 slaves with address area of 6KB I/O.
Beside the earlier posts by dchartierand UMENCHOyou can read more in SIMATIC NET PROFIBUS Network Manual System Manual Best regards. H-H |
Last edited by: H-H at: 5/17/2010 3:24 PM |
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| 5/17/2010 3:37 PM | |
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Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating:
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Dear UMENCHO, Thank you for your words. It's clear that Daniel was fasterand gave also more info I was even going to delete my post since it came with same ideas as you said but I left it sinceit included links for mentioned modules. Have a nice week Best regards. H-H |
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| 5/17/2010 4:55 PM | |
Joined: 10/7/2005 Last visit: 11/19/2024 Posts: 3027 Rating:
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Dear all I hate to be picky here as Daniel's and H-H's advise is (as usual) of the highest quality, but will nonetheless have to point out one little thing: 124 (not 125) DP Slaves is (should be)the maximum number of DP Slavesper DP Master interface of an S7. Reason being is that S7 HWconfig will (for good reasons) warn you if you try to use 0 as the DP Masters address (typically used by a PG, but alsorequired to be free if routing is used), so Address 1 is the lowest possible useable address in a DP Network and 125 is as always the highest one. Thistotals to 125, minus one address for the DP Master makes for a practical maximum of 124 DP Slaves. Having said that, some other DP Masters do (rather unfortunately) allow usage of 0 as the lowest address in which case 125 DP Slaves can be used on them. |
Last edited by: fritz at: 5/17/2010 4:58 PMCheers |
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