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Problem in Connecting CPU-315-2DP

Created by: patel_div at: 2/17/2008 8:40 PM (5 Replies)

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2/17/2008 8:40 PM	Rate (0)
patel_div Posts: 15 Rating: (0)	Hi everybody, Can anybody help me out for my problem. I have described my problem in detailswith the attachement with this thread. Please help me out. I will appreaciate quick response. Thanks. Attachment Profibus Connection Problem.pdf (445 Downloads)
patel_div Posts: 15 Rating: (0)
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2/17/2008 9:40 PM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Dear patel_div, I am a bit astonished I have to admit because as far as I see it you have either really old PROFIBUS Connectors or a more than strange behaviour. If you have a resent connector you should not have Stage 01 because you would either see the CP 5611 and the CPU or the CPU and the IM but certainly not all three. Stage 2 could be explainable if you have the PC and the CPU in different projects. In this case the Bus is configured differently and so the System is not stable, therefore the Problem with configuration mismatch could be due to the CP configured wrong. Stage 3 could be working, seen form the PROFIBUS point of view, because the distance between the CPU and the IM are less than maybe 5 m. Than this could still work at about 1.5 MBit. These are my thoughts on it. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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2/18/2008 4:58 AM	Rate (1)
Bang_Kee Advanced Member Joined: 2/4/2008 Last visit: 7/28/2023 Posts: 19 Rating: (1)	Greeting Patel, I think your problem is at the profibus connector. The On/Off switch is not the bus switch but actually the resistance switch. Meaning, that you need to switch on the resistor only at the end of the bus. So put everything back to OFF position except the last node (drive_02) and check again. We like to know the outcome. And also consider to change the network into: CPU315 IM153 Valve Manifold Drive_01 Drive_02 CP5611 + + + ++ + + + + + + + + + + + + + + + +++++++++ ++++++++ ++++++++ ++++++ ++++++++ ON OFF OFF OFF OFF ON Regards, Bang Kee
	Last edited by: Bang_Kee at: 28.02.2008 03:41 Last edited by: Bang_Kee at: 18.02.2008 05:14 Last edited by: Bang_Kee at: 18.02.2008 04:59
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2/18/2008 5:42 AM	Rate (0)
patel_div Posts: 15 Rating: (0)	Hi Bang, Thanks for your suggestion. I will try out with it and will reply soon. Thanks and Regards. Patel
patel_div Posts: 15 Rating: (0)
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2/18/2008 1:34 PM	Rate (1)
J_Bell Posts: 5822 Rating: (412)	Dear Patel Divyang, I am not sure if it is still the comparable situation you already had before, but I will try to answer. I agree with the concept you received with the first reply in this Threat but I would change a bit. First of all I would add on each end of the PROFIBUS line activeRS485 terminating elements. This way you keep a stable PROFIBUS Network, especially if you can not ensure that the first and last nodes are always available. Then I would start to think about the PROFIBUS itself. Are all the Nodes used within one Project, to receive the useable Bus parameter set? Is the Bus profile set to Standard? This is necessary to get the HMI able to communicate with the CPU because the S7-Protocol used is not DP. Is the Wiring OK? How long is the Bus segment?... Is a Repeater necessary?... And so on.... lots to think about. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
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2/19/2008 4:42 AM	Rate (0)
patel_div Posts: 15 Rating: (0)	Hi Bell, The profibus cable length was the problem. When i switched over to 187.5Kbit speed, all the things work right. Thanks for your suggestion. Thanks and Regards. Patel Divyang.
patel_div Posts: 15 Rating: (0)
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