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MODB4H with 2 networks: MODBUS TCP/IP redundancy

Created by: sserna at: 3/18/2012 10:55 AM (6 Replies)

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3/18/2012 10:55 AM	Rate (1)
sserna Posts: 3 Rating: (1)	Following a suggestion form a user, I post here this question (it is also open in the"Communication/Networks" forum... sorry for the duplicity) I need to communicate with several motor relaysusing Modbus TCP/IP. In the relays I can only configure one IP address and one port (502, the standard). I would like to use MODB4H (I am using a S7400H system), but according to all the manuals I have checked, it is not possible to configure in Netpro the same device twice with the same IP and Port properties. Is it possible to add a second ethernet network in Netpro, and connect each CP of the redundant configuration to a different network, and still use MODB4H? If so, I could configure each motor two times in Netpro, connecting the same motor (the two instances of the same motor)to the two different networks. Then I could use the same IP/Port valuesr. All examples in the manuals for MODB4H always use the same network for bothCP cards....
sserna Posts: 3 Rating: (1)
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3/19/2012 9:13 AM	Rate (1)
Kaulquappe Posts: 3093 Rating: (323)	Hello Sserna, yes it is possible to use two ethernets as you described. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)
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This contribution was helpful to 1 thankful Users jklm

3/19/2012 10:49 AM	Rate (0)
sserna1 Posts: 2 Rating: (0)	Thank you Kaulquappe . That saves me a lot of work. regards
sserna1 Posts: 2 Rating: (0)
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5/2/2012 1:08 AM	Rate (0)
gusbarron Posts: 4 Rating: (0)	Hi Kaulquappe, I too have a similar setup and creating two networks and dual 'Other Stations' with the same IP addresses does enable both CP cards to communicate when it's respective 4H CPU is active but I also have a redundant WinCC SCADA server pair - what's the best way to keep Netpro happy with a S7 fault tolerant connection from both PLCs to both SCADA servers? Right now it's warning me that 'The local partner is no longer connected to the original subnet' - is this going to cause issues when I recompile my OS?
gusbarron Posts: 4 Rating: (0)
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5/2/2012 8:43 AM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	Hello Gusbarron, when I understand you right you receive this error message for the WinCC communication. I'm afraid, I'm not experienced with WinCC. So probably somebody else can help. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)
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This contribution was helpful to 1 thankful Users gusbarron

5/3/2012 4:39 PM	Rate (0)
Ziemens Silver Member Joined: 3/2/2007 Last visit: 1/22/2025 Posts: 967 Rating: (5)	hy, do you have the order number of the Siemens module for Modbus TCP/IP ? thank you
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5/3/2012 5:17 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	Ziemens hy, do you have the order number of the Siemens module for Modbus TCP/IP ? thank you Hello Ziemens, it is the Modbus library 2XV9 450-1MB01 sserna is talking about. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)
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