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Profibus PC-S7200(slave)-MP177

Created by: schumiinq at: 4/28/2012 11:15 AM (2 Replies)

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4/28/2012 11:15 AM	Rate (0)
schumiinq Posts: 6 Rating: (0)	Hello, I'm having a bit of a problem with my profibus network. The layout is like this: PC (winccflex + OPC server)----------- S7-200 ---------- HMI MP 177 master (cp5613a2) slave module master The profibus ring is not closed between PC and MP177. The issue is that when i close the PC and the profibus connector is not powered i loose communication between MP177 and PLC...which is bad :) Will closing the profibus ring PC ----HMI solve my problem? ... MP177 has "PG/PC is the only master on the bus" selected IS it a profibus connector power up issue because the soon as i pres the power button on the PC i have comm between PLC and MP177 ? Can I try to connect s7200 from master port to the hmi to solve my problem ? AS master module 243-2 for s7200 is a solution ? Buying other equipment is out of the question...maybe a master module for s7200 if it solves my problem, but i'm not sure since i don't have the equipments in a test bench and i'm only allowed brief visits to the installation. Thank you for your ansmwers!
schumiinq Posts: 6 Rating: (0)
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4/28/2012 11:38 AM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 3/12/2025 Posts: 4518 Rating: (843)	schumiinq Hello, I'm having a bit of a problem with my profibus network. The layout is like this: PC (winccflex + OPC server)----------- S7-200 ---------- HMI MP 177 master (cp5613a2) slave module master The profibus ring is not closed between PC and MP177. The issue is that when i close the PC and the profibus connector is not powered i loose communication between MP177 and PLC...which is bad :) Will closing the profibus ring PC ----HMI solve my problem? ... MP177 has "PG/PC is the only master on the bus" selected IS it a profibus connector power up issue because the soon as i pres the power button on the PC i have comm between PLC and MP177 ? Can I try to connect s7200 from master port to the hmi to solve my problem ? AS master module 243-2 for s7200 is a solution ? Buying other equipment is out of the question...maybe a master module for s7200 if it solves my problem, but i'm not sure since i don't have the equipments in a test bench and i'm only allowed brief visits to the installation. Thank you for your ansmwers! Hello, I am not sure that I have understand your question correctly. In any case, I have to points which I wanted to discuss here: It is not possible to make a ring profibus network using copper wires. It's possible only using optic cables, and in this case you have to use OLMs You can add active terminal resistance with an external poswer supply in order to ensure that all profibus nodes "6ES7972-0DA00-0AA0" are always powered independent of any node supply voltage. This way is not expensive and will increase the avilability of the network.
	Ayman Elotaify
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This contribution was helpful to 1 thankful Users Lucky123

4/28/2012 12:06 PM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (309)	Hello, A profibus network must be terminated at it both ends. Normally you do this by switching on the termination resistor on the profibus connectors at the bus ends. The termination resistors are powered by the profibus devices. If you unpower the last device of the bus, or you disconnect the last device, the resistor is not powerd anymore, and you could have a problem. I guess that you always leave the PLC and the HMI under power. Put them ath Try to reorganize the network like this: - put the PLC and the HMI ateachend of the bus. - switch the terminationON at PLC and HMI side - put the PC in the middle and switch the termination OFF on the PC connector. This would allow you tounplug/remove the PC at any time. If you cannot reorganize the network, You could also put at the end of the network a powered terminator like the one described here: http://support.automation.siemens.com/WW/view/en/19102444 Then the PC, the PLC and the HMI like in your original drawing. Activate the Termination on HMI.
	Best regards jklm Suggestion was helpful? Feel free to rate it.
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This contribution was helpful to 1 thankful Users Lucky123

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