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Multiple Modbus RTU slaves with CP341/CP441?

3/11/2008 3:11 PM	Rate (0)
Kicken Experienced Member Joined: 3/11/2008 Last visit: 11/7/2024 Posts: 80 Rating: (4)	Hello all! I am working on a project where we have one CP441 configured as Modbus master that isreading data from8 diffrent Modbus slaves (protection relays) and one CP341 Modbus master reading data from 3 Modbus slaves (protection realys). Is this possible? I can't figure out how to set the slave address of the modbus slaves!? Is it SFB13 BRCV the block to be used with the 400 and FB7 P_RCV_RK to be used with the 300?

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3/11/2008 4:11 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 11/19/2024 Posts: 4353 Rating: (1452)	Hi, the slave adress is part of the send DB data. You can have more then one slave on your CP, but you need to mount a user program to manage it.
	Denilson Pegaia Siemens Industry Sector Technical Support
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3/12/2008 9:42 AM	Rate (1)
druim Posts: 3 Rating: (1)	I think that this manualis what your searches......good luck Attachment Modsla_e.pdf (1654 Downloads)
druim Posts: 3 Rating: (1)
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3/12/2008 12:45 PM	Rate (0)
Kicken Experienced Member Joined: 3/11/2008 Last visit: 11/7/2024 Posts: 80 Rating: (4)	I want the CP341/441 to be MASTER, and I have the manual for Modbus master https://support.automation.siemens.com/WW/llisapi.dll/1220184?func=ll&objId=1220184&objAction=csView&nodeid0=10805065&ehbid=html%5F76%2Fehb%2F1220184%2Ehtm&nodeid=1219437&lang=en&siteid=cseus&aktprim=0&extranet=standard&viewreg =WW&load=content&csQuery0=6ES7870-1AA00-0YA0&subtype=133300 I think i have figured out how it works for the CP341, if it is true that I don't need to configure anything in NetPro?! But the CP441 is still unclear: - Is it enugh to have only one slave configured in NetPro? Even doughI have 8 slaves? It doesn't seam to be possible to connect more than one slave to one CP441 in NetPro, whichis understandable when PtP network is used. - The data I want to read is at address 41991-42060 (70words), it doesn't seam to be possible to start at a specified address with the SFB13 BRCV block or is it? or must I read from 40000 to 42060? Thank you for all help!
	Last edited by: Kicken at: 12.03.2008 12:49 Last edited by: Kicken at: 12.03.2008 12:47 Last edited by: Kicken at: 12.03.2008 12:45
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3/14/2008 12:15 PM	Rate (2)
DR75 Posts: 4 Rating: (2)	Good luck ! It runs perfectly. Bye Attachment MODBUS_300_MULTIREQ.zip (1967 Downloads)
DR75 Posts: 4 Rating: (2)
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This contribution was helpful to 2 thankful Users Dan_Tien_Shan Soroosh.v

12/1/2010 8:47 PM	Rate (0)
Maximiliano Fucile Posts: 2 Rating: (0)	Hi kicken, you only have to declare oneconnection in the Netpro, and you enter its number in the ID parameter in both BRCV and BSEND. The you use a different "R_ID" for each slave. Hope it helps.
Maximiliano Fucile Posts: 2 Rating: (0)
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