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Can i use a CP into my S7-400 for communicate with MODBUS external CPU?
Created by: Import-User-1 at: 9/7/2009 9:37 AM (4 Replies)
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| 9/7/2009 9:37 AM | |
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Posts: 3609 Rating:
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Import of a Technical Question of an User Guestwrote: Hi, Can i use a CP into my S7-400 for communicate with MODBUS external CPU? If yes which type and how? thx |
| 9/7/2009 10:04 AM | |
Joined: 10/3/2008 Last visit: 4/15/2025 Posts: 996 Rating:
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Hi, which modbus do you mean? RTU, TCP? What do you mean with "MODBUS external CPU"? Wüstenräuber |
| 9/7/2009 11:55 AM | |
Joined: 1/17/2007 Last visit: 4/15/2025 Posts: 1560 Rating:
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Your solution will depend on which CP you are using. For ethernet CP (e.g. CP443) there is an open modbus TCP solution available here:- S7 Open Modbus TCP You can further convert the TCP modbus to RTU modbus if you wish by use of a third party convertor. Lantronix do a very good one that I have used before. Available here:- Lantronix Modbus TCP to Modbus RTU convertor If you are using serial a CP (e.g. CP441, CP341 etc.) then there is a modbus dongle you can purchase to make the CP talk modbus RTU. Or you could write your own block in STL/SCL - that's what I did |
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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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| 10/20/2009 10:04 AM | |
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Posts: 2 Rating:
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hi,smiffy,could you upload your own modbus block here,thanks |
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