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ProfiHub B5 effect on Monitoring Time

Created by: MicroMan at: 7/30/2014 10:40 AM (1 Replies)

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7/30/2014 10:40 AM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 2/20/2023 Posts: 1347 Rating: (226)	Hi, I get involved in a project in its design phase, and been asked about expectable resonse times. My config od a typical loopbasically built up from F-DI(In Switched ET200M) -> ProfiHub B5 -> F-CPU -> ProfiHub B5 -> YLink -> S120 I downloaded the S7ftimeb spreadsheet, to do the calculations. The question is: How to calculate the ProfiHub B5 into the F- monitoring time of the F modules? Also How to put this factor into the response time calculation? Any advice appreciated! Cheers:
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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7/30/2014 11:07 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/26/2023 Posts: 2962 Rating: (1022)	Hello MicroMan jolly good question I must say and here's my take on this: Peoplegenerally do consider the repeater part of the cable and do NOT take its delay into account. Saying that, a ProfiHub (just like any other PROFIBUS repeater) does cause a slight delay. How much is dependent on the baudrate and the valuescan be foundin the technical data section of the ProfiHubmanual (available at http://www.procentec.com/downloads/index.php). You'll see them specified inbitrate values, e.g.1.4 Tbit at 1.5Mbps. A Tbit is 1/baudrate, so it has a valueof0.6667 µsfor 1.5 Mbps, which then equatesto a time delay of 0.9333 µs(1.4 *0.6667 µs). I hope this helps (and leave it as your call it you want to include this almost 1 full microsecond delay per ProfiHub in your calculations or not ).
	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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