12/19/2015 1:38 PM | |
Posts: 45 Rating: (0) |
I would like control 11 independent facilities via MODBUS TCP. Our requirement is making Fault-tolerant system. So, we will use two 417-5H CPU modules. And we are considering using CP443 cards. So, I am considering making rack as attached drawing. In this kind of requirement, is it possible to run 11 different MODBUS TCP communication? Attachmentdiagram.pdf (751 Downloads) |
12/19/2015 3:11 PM | |
Joined: 9/27/2006 Last visit: 12/7/2024 Posts: 12301 Rating: (2692) |
Hello Dolpong; To complete your project you will need a redundant license for Open Modbus/TCP. The attached illustration was taken from a Siemens brochure on Open Modbus/TCP. This FAQ will give you mere information: https://support.industry.siemens.com/cs/ww/en/view/22660304 Hope this helps, Daniel Chartier |
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1/23/2016 3:21 PM | |
Posts: 45 Rating: (0) |
Dear all, I had asked possible connection numbers with MODBUS TCP communication. And I have a problem now. I made configuration as my previous diagram. For your understanding, I am attaching the same diagram again. And we ordered Modbus/TCP RED V2 (2XV9450-1MB11) We would like to use PLC as MODBUS client. And would like make connection with 11 different MODBUS servers.as attached diagram picture After reading "SIMATIC Modvus/TCP Redundant Communication via CP443-1 in H-Systems" manual, I came to think that "MODBUS/TCP RED V2" cannot make different 11 MODBUS connections simultaneously. Then, we cannot make configuration as attached diagram. If we move PLC MODBUS TCP connection to CPU's PN port and use Modbus/TCP PN CPU Redundant (6AV6676-6MB10-0AX0), could we make 11 independent MODBUS TCP connections ? Attachmentdiagram.pdf (586 Downloads) |
1/23/2016 7:48 PM | |
Joined: 9/27/2006 Last visit: 12/7/2024 Posts: 12301 Rating: (2692) |
Hello Dolpong; What information are you basing this estimation on? There is a huge amount of documentation on the Siemens Support site that can answer your question quite precisely. How many devices can you connect to an S7-300/S7-400 using the Modbus/TCP protocol? https://support.industry.siemens.com/cs/ww/en/view/103709646 Communication
via CP443-1 The CP 443-1 (6GK7 443-1EX30-0XE0) technical data shows 64 connections possible in the section Performance Data/Open communications (with T-blocks and the Send/Receive blocks). So your 11 servers should have no problem connecting to your S7-400H system over Redundant Modbus/TCP.
If this is not the exact model of CP 443-1 you plan to use, look for the datasheet for that model so you may have the correct information. Hope this helps, Daniel Chartier
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1/24/2016 1:09 AM | |
Posts: 45 Rating: (0) |
Dear Daniel, Thank you for your comments. In order to implement MODBUS Client at S7-400H system, we ordered Modbus/TCP RED V2 (2XV9450-1MB11) Please refer attached manual file that I found out at Siemens website. And I think that FB MB_REDCL could be used. In order to make client program to distinguish one connection among 11 connected servers, I think that remote server device identifier(such as IP address) is required to select communication partner. But, FB MB_REDCL does not have such parameter. Could you check my problem and let me know whether I can find out solution? AttachmentModbusTCP_NCM_CP_Red_V2_English.PDF (611 Downloads) |
Last edited by: Dolpoong at: 1/24/2016 1:11:51 AM |
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1/25/2016 4:09 PM | |
Posts: 3093 Rating: (323)
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Hello Dolpoong, Regards, |
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