7/2/2009 4:13 PM | |
Joined: 9/27/2006 Last visit: 2/12/2025 Posts: 12335 Rating:
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Hello navnag; The only problem I can see with your design is the RS-485 segment joining 2 OLMs. Each OLM should have its own sepoarate segment. See the typical ring topology shopwn in the attached illustration. It comes from the Profibus Networks manual, which can be found here: http://support.automation.siemens.com/WW/view/en/35222591 You will also need to make sure dipswitches and configurations are setup properly on the OLMs for the ring to work. You will find information on the subject in the OLM Operations manual: http://support.automation.siemens.com/WW/view/en/24164176 Hope this helps, Daniel Chartier |
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7/3/2009 6:07 AM | |
Posts: 116 Rating:
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Hi J Bell, Can you provide some more informations on OLM? since these OLM's might be useful in our network too. Thanks and Regards Paresh |
7/3/2009 6:18 AM | |
Joined: 8/25/2006 Last visit: 2/11/2025 Posts: 2213 Rating:
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Hereis the manual for Profibus OLM's:
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Last edited by: KSN at: 7/3/2009 7:03 AM |
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7/3/2009 7:44 PM | |
Joined: 9/27/2006 Last visit: 2/12/2025 Posts: 12335 Rating:
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Hello Navnag; Just to add to Mumbles' last post, here are a few considerations you should look at: First, in the OLM manual suggested earlier, you will find this comment: Single DTEs or complete PROFIBUS segments with a maximum of 31 nodes can be connected to the electrical interface of the PROFIBUS OLM. So a repeater would onl;y help to extend the length of copper cable inside the segment, not the number or speed of the copper segment attached to the OLM. Next, there are configuration details of the redundant ring that must take into account the number of OLMs, the number of nodes (the HSA must be set at least one higher that the number of slaves, or the ring will jnot close in case of failure of one ring), and the total length of fiber optic cable. This is described in part in the OLM manual, and also in the "Simatic Net Twisted-Pair and Fiber-Optic networks" manual: http://support.automation.siemens.com/WW/view/en/8763736 And show your client that limitations of a Profibus network always remain, amongst which is the number of nodes limited to 125. “Connecting more than 125 DP slaves to a shared DP master system” |
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