11/24/2011 1:38 PM | |
Posts: 378 Rating: (47) |
Hello RAJKIRAH, maybe it could be helpful to know a little bit more what you want to do? Is it possible that your question has something to do with the following thread? Modbus communication with CP 341 Best regards Bilao |
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11/24/2011 3:40 PM | |
Joined: 1/17/2007 Last visit: 5/2/2024 Posts: 1542 Rating: (532)
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I thought the self same thing. |
Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. |
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11/25/2011 9:35 AM | |
Joined: 8/18/2009 Last visit: 2/22/2024 Posts: 541 Rating: (33) |
Dear Expert, If I am taken modbus to TCP/IP Converter rather than CP 341.I think it is economical option then which converter hardware I can use. I have given Modbus (Devices/Parameter)-(163/1897). i am using CPU 414-2DP . means node will be 163. then how meny modbus to TCP/IP Converter required. I have used scalence for comm. between CP 443-1 & modbus to TCP/IP Converter. is it read 11 modbus to TCP/IP Converter data on the CP using scalence. |
Last edited by: RAJKIRAN at: 11/25/2011 9:38 AMLast edited by: RAJKIRAN at: 11/25/2011 9:35 AMRajkiran Patil |
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11/25/2011 4:26 PM | |
Joined: 1/17/2007 Last visit: 5/2/2024 Posts: 1542 Rating: (532)
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I am not sure how you see this as the more economical option. A decent TCP to RS485 convertor such this one made by Lantronix will be in the region of $400 (and you may need several of them - see below). You would also need the Open Modbus TCP software from IT4Industry, which is in the region of 1000 Euros.
One CP341 can interface to as many RS485 slaves as a TCP to RS485 convertor can. The 31 slave limit is not a limit of the CP341, it is a limit of the actual physical layer (in this case RS485). So you will need just as many convertors as you would need CP341 cards. So I expect that it will not be a great cost saving using convertors (it might even be more expensive). I cannot quite understand your exact requirements. Is it that you have 163 modbus slaves to interface to? If so, then you will need 163 / 31 convertors or CP341 cards (your choice which), which equates to 6 in total. The network will have to be split into 6 individual networks, each containing a maximum of 31 slaves per network. This is quite an extensive network and certainly bigger than any I have ever been involved in. There is no technical reason why this cannot be made to work, but it will be costly and require quite a bit of effort on your part. Best of luck! |
Programming today is the race between software engineers building bigger and better idiot proof programs, and the universe producing bigger and better idiots. |
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