4/8/2010 4:01 PM | |
Posts: 76 Rating:
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Hi all, Anybody knows the maximun distance allowed between two ET200 racks throught Profibus without using any other device. Thanks |
4/8/2010 4:55 PM | |
Joined: 1/17/2006 Last visit: 7/4/2024 Posts: 553 Rating:
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Hello AEnes ! I found a thread about it answered by colleague and ExpertMr. Daniel Chartier (dchartier). As he sad: "The maximum length of a Profibus segment will depend on the speed selected for the network bus. Have a look at the following attachment, extracted from an old Siemens presentation (the data is still valid, no worry)." Take a look at the complete thread whether you want here: Profibus Topology. Greetings, Berg |
Last edited by: Berg at: 4/8/2010 4:56 PM"Educate the children and it won't be necessary to punish the men." |
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4/9/2010 9:35 AM | |
Posts: 76 Rating:
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Hi Guys, Thanks for your answers, It seems I wont have problems as the speed of my Profibus Network is set to 1.5Mb and the distance will be less than 50m. Thanks |
4/10/2010 12:26 PM | |
Joined: 10/7/2005 Last visit: 7/14/2024 Posts: 3009 Rating:
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Hello Berg there are two additional requirements that apply to Profisafe installations: 1.) Spur lines on the Profibus RS485 Segmentare NOT allowed 2.) All Devices on the bus (Safety and Standard Master or Slaves) must be certified. Note that the majority of Profibus DP Slaves are unfortunately NOT certified asit is not mandadory with Profibus (it is however mandatory with for Profinet devices to be certified by an accredited PI Test Labority if the manufacturer wants to be able to have the Profinet logo on it). Have a look at the PI's assembling guidline which has more on this subject and isa free download from HERE: I agree with Daniel's assertion though that your orignal problem with your ProfisafeET200S stationsafety "dropouts" was probably morerelated to a generally "weak" signal level which lead to corrupted and repeated messages. As Profisafeadds extra checking and timeout mechanims to the protocol it is then the first station to "suffer". I hope this helps |
Cheers |
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4/10/2010 10:59 PM | |
Joined: 1/17/2006 Last visit: 7/4/2024 Posts: 553 Rating:
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Hello fritz ! Thank you for the help. Good PDFs files ! I agree with you andmr. Chartier the problem was weak signal level. Best regards. |
"Educate the children and it won't be necessary to punish the men." |
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