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transfer rates in relation to line length for PROFIBUS-DP

7/11/2012 8:16 AM	Rate (0)
AnilSangwan Posts: 17 Rating: (0)	Hi everyone, is it possible to change The transfer rates in relation to line length for PROFIBUS-DP online .if it is possible then what is the procedure.and also how we can check the current setting for the transfer rate of Profibus. Regards Anil Sagwa
AnilSangwan Posts: 17 Rating: (0)
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7/11/2012 9:18 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, On what devices do you want to make changes? More details please, a drawing off the network would be nice. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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7/11/2012 9:25 AM	Rate (0)
Ayman Elotaify Diamond Member Joined: 5/28/2008 Last visit: 1/8/2026 Posts: 4522 Rating: (843)	AnilSangwan Hi everyone, is it possible to change The transfer rates in relation to line length for PROFIBUS-DP online .if it is possible then what is the procedure.and also how we can check the current setting for the transfer rate of Profibus. Regards Anil Sagwa Hello, In the following FAQ "What should you watch out for when using the RS485 repeater in PROFIBUS and MPI bus systems?", please see the table ofMaximum line length of a PROFIBUS segment vs. Baud rate. To change baud rate, open HW config. and click on the profibus network line, then a popup window will appear with current profibus network settings, change the baud rate as you want. Hope this helps.
	Ayman Elotaify
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7/11/2012 10:05 AM	Rate (0)
AnilSangwan Posts: 17 Rating: (0)	Hi Ayman, I have checked the configuration and Baud rate is 1.5 MBPS for all DP`s.But 2 Nos. of DP are more than 200Mtr.so can i change Baud rate for individual DP and also can i do it online without disturbing the process as plant is running. regards Anil Sagwan
AnilSangwan Posts: 17 Rating: (0)
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7/11/2012 10:46 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/7/2026 Posts: 3054 Rating: (1062)	Hello AnilSangwan no, you can NOT change the Profibus speed online. You must do so offline in the HWconfig, download it andit will as such require a CPU Stop/Start. It actually won'tmake sense to allow an online bus speed change and the reasons are: Apart from certain Bus parameters (e.g.Slot time), the important response monitoring time (aka Watchdog time) is changed too when you change the baudrate. This Watchdog time is sent to each DP Slave as a parameter upon DP Master startup (or DP Slave startup in case it had failed). EachDP Slave needs this value to determine whento go into a failsafe state in case the DP Master does not "speak" to it anymore. ADP Master startup is thus mandatory after you change the bus speed, so there is unfortunately no way to change the baudrate "online" and keep the Profibusrunning. I hope 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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