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will the length of the Profibus cable change the Profibus speed setting in the Hardware Configuratio?

Created by: T41 at: 3/9/2010 1:39 AM (2 Replies)

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3/9/2010 1:39 AM	Rate (0)
T41 Posts: 88 Rating: (1)	Thanks! I just wonder if the length of the Profibus cable will change the Profibus speed setting in the Hardware Configuration. For example, the setting in HWCfg is 1.5M, while the length of the profibus exceeds the limit of the speed(1.5M) (>200m), what will happen? Give you some error message? Automatically decrease the spee? Or stop working? Thanks! T41
T41 Posts: 88 Rating: (1)	Last edited by: O_Moderator at: 3/11/2010 1:05 PM new subject after splitting from /tf/WW/en/Posts/41057#top
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3/9/2010 6:42 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 12/24/2024 Posts: 3029 Rating: (1058)	T41 I just wonder if the length of the Profibus cable will change the Profibus speed setting in the Hardware Configuration. Hello T41 No it will not, the bus will alwaysrun at the speed that you set in HWconfig irespective of the actually installed cable length. Bear in mind too that you could have repeaters installed which are not configered in HWconfig. While youcan (and should) nominate the cable lenght, number of Repeaters,OLM's etc. in the options tab of the network setings, thesesettings willhowever only affect the bus timing parameters (e.g .Slot time, retry limit etc.) but will NOT change the bus speed. T41 For example, the setting in HWCfg is 1.5M, while the length of the profibus exceeds the limit of the speed(1.5M) (>200m), what will happen? Give you some error message? Automatically decrease the spee? Or stop working? It will NOT automatically decrease the speed (see also above answer), but exceeding the Segment cable lenght for the choosen baudratecould lead to sporadic bus problems oreven complete bus failure (it all depends on how or bad the signal qualityis). Ihope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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3/10/2010 3:20 AM	Rate (0)
T41 Posts: 88 Rating: (1)	Thank you very much! T41
T41 Posts: 88 Rating: (1)
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