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PLC added to PROFIBUS network. Master PLC HW config needs to be changed??

Created by: Giedrius_Kai at: 11/24/2014 3:11 PM (9 Replies)

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11/24/2014 3:11 PM	Rate (0)
Giedrius_Kai Experienced Member Joined: 1/16/2012 Last visit: 9/8/2022 Posts: 72 Rating: (3)	Hello, I have to add CPU 313C-2 DP into the existing PROFIBUS network. There is already another PLC (SIMATIC CPU315-2DP) that is the Master of the network + there is a PC for SCADA with a PROFIBUS card. I need to do some changes in the SCADA related just with the new PLC I'm gonna add. Those 2 PLCs won't communicate with each other. My question is : Do I have to change the HW config of the Master PLC and add new Slave PLC into its HW config? Or can I just change SCADA config and that's it? Regards, Giedrius K.
	Last edited by: Giedrius_Kai at: 11/24/2014 3:16 PM
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11/26/2014 8:28 AM	Rate (0)
rusli_rusli Bronze Member Joined: 3/31/2009 Last visit: 7/16/2024 Posts: 191 Rating: (3)	hii, you can just add new plc to the existing network without need to reconfigure existing plc ( if there's no communication between two plc).. set the new plc as profibus master ( multi master network ). and on scada you just create new connection to new plc. br rusli

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This contribution was helpful to 1 thankful Users MicroMan

11/26/2014 11:55 AM	Rate (0)
Giedrius_Kai Experienced Member Joined: 1/16/2012 Last visit: 9/8/2022 Posts: 72 Rating: (3)	Hi, At the moment the new PLC is configured as a Slave. Should I change it to Master or Slave is OK? Is it a multi master network by default or do I need to change any PROFIBUS settings? Regards, Giedrius K.

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11/26/2014 12:50 PM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 2/4/2025 Posts: 1362 Rating: (233)	HI, The same question discussed here: https://www.automation.siemens.com/tf/WW/en/Posts/78654 It is really clear. The question is very similar. Regards:
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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11/26/2014 1:05 PM	Rate (0)
Giedrius_Kai Experienced Member Joined: 1/16/2012 Last visit: 9/8/2022 Posts: 72 Rating: (3)	I think it was a bit different situation. I'm not interested in the cable connections, I just want to connect a new PLC into an existing network without a need to modify the existing PLC HW config. It's still not clear to me. If it's clear to you, could you clarify it to me. Thanks. Regards, Giedrius K.

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This contribution was helpful to 1 thankful Users MicroMan

11/26/2014 2:17 PM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 2/4/2025 Posts: 1362 Rating: (233)	Hi, The referencedthreadadvise(in the response) to compile the multiple stations in Netpro. I looked up a manual for you. This explains clearly what to do and how: http://support.automation.siemens.com/WW/view/en/1158693 See chapter "1.7.3 Network/Project Variant: Two or More Subnets − One Project" I hope that clarify things a bit. I would follow the advice in the referenced topic and the official manual. It is up to you, but I think life is easier if you follow manuals. Cheers
	Last edited by: MicroMan at: 11/26/2014 2:22 PM - What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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11/28/2014 7:47 AM	Rate (0)
Giedrius_Kai Experienced Member Joined: 1/16/2012 Last visit: 9/8/2022 Posts: 72 Rating: (3)	Thanks MicroMan for the link, but I still haven't found the final answer to my question. Here's the situation... There is an old PLC (PROFIBUS Master) + PC with SCADA on the same PROFIBUS network. I need to add my new PLC into this network and modify the SCADA. I don't need to do any changes in the old PLC. The plant is almost running 24/7 and I don't want to do any modifications of the existing PLC HW. At least, I'm trying to avoid it if I can. So, my straight-forward question is: can I connect my new PLC to the existing PROFIBUS network without modifying the old PLC HW config and then add a new WinnCC new connection in the SCADA? There should be two seperate PLC projects without any interface. rusli_rusli wrote that it is possible.

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This contribution was helpful to 1 thankful Users MicroMan

11/28/2014 9:21 AM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 2/4/2025 Posts: 1362 Rating: (233)	Hi, I feel your pain. It is a hard decision. It is a guess from me: I think whatrusli_rusliwrote may work. I believe you will have interesting operational problems as the two PLC can disturb each others communications. That is my guess for this. I would not do it. The reason I attached the manuals, as this is the best way to do it. I would try to follow the manual even if it looks painfull. Regards:
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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11/28/2014 9:27 AM	Rate (0)
Giedrius_Kai Experienced Member Joined: 1/16/2012 Last visit: 9/8/2022 Posts: 72 Rating: (3)	I wouldn't be surprised if the solution is really simple, but I just wanna prepare for the worst, because I won't have much time :) So, advice based on personal experience would be great.

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11/28/2014 10:19 AM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 2/4/2025 Posts: 1362 Rating: (233)	HI, Personal experience: I have seen a good example in a big plant where aroun10 S7-400 were shared a 12M Profibus DP to talk to HMIs and each other. The application was compiled together. Regards:
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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