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About PROFIBUS Terminator

Created by: Ross_A at: 10/31/2008 2:31 PM (1 Replies)

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10/31/2008 2:31 PM	Rate (0)
Ross_A Posts: 30 Rating: (0)	Daniel Chartier, you did it again, an excellent answer! So good, that i'm struggling to find another question to ask, but i have one.. Regarding termination resistors, i looked on the internet and it stated that the value of the terminating resister had to be the same as the impedance of the cable it's connected to, however the profibus connectors have termination resistors built into them, so i assume they are a fixed value. Was i misinformed that that the termination resisto value needs to be variable? Also, i have been doing some reading on profinet and i am thinking that it may be better to use profinet instead of profibus, or will this make things too complicated? Do you think that it would be more appropriate to start a new thread for this last question? Thank you for your time. Regards, Ross
Ross_A Posts: 30 Rating: (0)	Last edited by: CS Moderator at: 10/31/2008 4:39 PM new subject after splitting
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10/31/2008 3:29 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/15/2025 Posts: 12328 Rating: (2698)	Hello Ross; For the terminations, trust the embeded resistors on the Profibus connectors; I have had to deal a few times with "budget-strapped"(cheap) clients trying to setup Sub-d 9-pin connectors with their own resistor combinations and complaining the damn fieldbus wouln't work properly. Like I told them, if Siemens is too expensive look at Phoenix Contacts. Weidmuller, ABB and other providers of certified Profibus quipment. If you plan to use Profinet-IO you will need CPUs 31x-2PN/DP, and an standard Ethernet setup (switches and Cat 5 cable at least) fpor your network. This manual will show you the requirements on the CPU side (yeah I know, a lot of reading, but you did ask for information!). http://support.automation.siemens.com/WW/view/en/19290251 You can still use ET 200M stations with Profinet-IO, but you will need another version of the IM (I did mention that different part numbers supported different networks: the IM 153-4 connects to Profinet: http://support.automation.siemens.com/WW/view/en/25325089 Setup is still done in the HWConfig editor, however instead of GSD files you will need their XML equivalent, GSDML files for your slave units. I agree that you should probably have more and better answers on Profinet if you start your questionning on aother thread, stating in the title that you require help on Profinet. Many participants have a lot of experience and will be willing to give details on your setup. Good luck, you'll have as full weekend just looking at ther proposed documents! Hope this helps, Daniel Chartier P.S. You might have noticed that most of the proposed documentation from Siemens is flocated on the support.automation.siemens.com site. You can get there from the Product Support link at the top of this page, and the Search engine on that site is one of the best in the business. The more precise the search item requested, the more precise the answers, and you can sort them by manuals, FAQs, downloads and Applications (example projects and programs), which can again limit the number of hits. Go there often until you get the feel of the site, you'll save a lot of developmenttime if you have the right information. D.C.

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