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terminators on profibus connectors

Created by: Ovchinnikov Pavel at: 1/20/2015 8:26 AM (7 Replies)

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1/20/2015 8:26 AM	Rate (0)
Ovchinnikov Pavel Posts: 6 Rating: (0)	Hello! I've confusing situation with setting terminators on profibus connector in our profibus system. CPU 315F-2 DP, 7 slave units on profibus, in the end of the bus I've Sinamics G150. Terminator in G150 connector is ON. CPU is normally communicating with G150, but I can't connect to it via my Field PG M4. When I turn OFF terminator in G150 connector, connection via Field PG is possible and CPU normally communicates. Which documentation do I need to use to set terminators in this situation? Thanks.
Ovchinnikov Pavel Posts: 6 Rating: (0)
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1/23/2015 12:34 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 12/24/2025 Posts: 9097 Rating: (1202)	Hello, Are you using a Profibus connector? How is Profibus line connected? Where do you connect the Field PG? Best regards, Wizard

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1/24/2015 6:51 AM	Rate (0)
Ovchinnikov Pavel Posts: 6 Rating: (0)	Hello! Yes, I've tried to use a few profibus connectors like 6es7972-0ba52-0xa0 and the same type. Profibus line is connected DP topology using copper cables. Devices shown in the attached jpg. Total length of the Bus is about 20 meters, transmission rate is 500 kb/s. I've connected the Field PG from double-sided profibus connector in CPU 315F-2 DP, also I've tried to connect it from the same connector in Sinamics G150, and when terminator on Sinamics G150 (Last unit in the network) is "on", connection is not possible via Field PG, not from double-sided CPU connector, not from Sinamics connector. Thank you for your answers. Kind regards, Pavel. Attachment PB_sys.jpg (254 Downloads)
Ovchinnikov Pavel Posts: 6 Rating: (0)
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1/26/2015 8:46 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 12/24/2025 Posts: 9097 Rating: (1202)	Hello, Perhaps this manual might help: SIMATIC NET PROFIBUS Network Manual System Manual Best regards, Wizard

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1/27/2015 3:50 PM	Rate (0)
Min_Moderator Posts: 4758 Rating: (122)	New question published byali6 is split to a separate thread with the subject random components sudenly disconnect Best regards Min_Moderator
Min_Moderator Posts: 4758 Rating: (122)
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1/28/2015 5:37 PM	Rate (0)
Ovchinnikov Pavel Posts: 6 Rating: (0)	Hello, This manual only writes: "If the bus connector is located at the start or the end of a segment, you must connect the terminating resistor ("ON" switch setting) (refer to the following figure)." But in my case it's don't fully work. It's fully work when terminating resistor is OFF ( on the end of a segment) Best regards, Pavel.
Ovchinnikov Pavel Posts: 6 Rating: (0)
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1/29/2015 8:51 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 12/24/2025 Posts: 9097 Rating: (1202)	Hello, Are you using a Profibus Connector? How is the cable connected? (At the Profibus connector you have a IN and OUT side, indicated by an arrow) You should connect it to IN side, because when you use Terminator resistor, you disconnect the OUT side. Best regards, Wizard

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2/1/2015 8:00 AM	Rate (0)
Ovchinnikov Pavel Posts: 6 Rating: (0)	Hello, Yes, I amusing a Profibus Connector. Cabel is correctly connected. In each case of switching terminator resistor connection with PLC has worked, but when TR is on, Field PG is not connects (One time in this case I did connected to Sinamics G150 via routing through MPI port of PLC).Thank you for your answers. Kind regards, Pavel.
Ovchinnikov Pavel Posts: 6 Rating: (0)
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