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|10/31/2008 10:01 AM|
Last visit: 12/23/2011
On site we have some devices that are loacted at the end of the PROFIBus line, but the interface card does not have a 9 pin adapter, just some terminals.
At the minute everything is running OK, but am aware that a terminating resistor is normally enabled if the plugs are used.
I assume it would be wise to put an end of line resistor in the circuit?
If so, what value of resistance is to be used?
|10/31/2008 10:49 AM|
Last visit: 6/29/2015
May be you don't check carefully inside in devices? Did you read manufacture data sheed about this profibus connection? I'll give you one example. In ABB profibus modul is the same on the first look - just plug in red and green cables. But if you want to terminate the line must open the cover and switch on one button.
But any case about resistance you can find more info here: http://www.ccontrols.com/pdf/ExtV1N1.pdf
Last edited by: UMENCHO at: 10/31/2008 10:50 AM
|10/31/2008 3:44 PM|
Last visit: 6/30/2015
I strongly suggest you look into this Siemens offering:
Other manufacturers offer something similar (you can check on profibus.com, in the Products section); they take care of thetermination requirements, but also of grounding and isolation issues which resistors soldered to the lines will not handle. I have had some ugly experiences with clients trying to do it in-house and then blamed the fieldbus for the issues they had.
Hope this helps,