10/23/2019 1:00 PM | |
Joined: 9/27/2006 Last visit: 9/25/2024 Posts: 12283 Rating: (2685) |
Hello Rajesh; To setup a S7-200 CPU as a Modbus RTU master, you need to licence (purchase) the Modbus/USS Library for Microwin: https://support.industry.siemens.com/cs/us/en/view/17470979 Once the library is installed, follow the directives in the following document to use the S7-200 as a Modbus RTU master: https://support.industry.siemens.com/cs/us/en/view/27832511 On the PowerFlex drive side, you need to review the Modbus mapping of the data you can request through the master: Hope this helps, Daniel Chartier |
10/24/2019 12:31 PM | |
Joined: 9/27/2006 Last visit: 9/25/2024 Posts: 12283 Rating: (2685) |
Hello Rajesh; Have you tried interrogating the VFD with a Modbus RTU master simulation program, such as Modscan32/64 (there are many similar programs you can find on the web)? https://www.win-tech.com/html/demos.htm It is important that you check the response of a Modbus RTU slave with an alternate master when you have difficulty establishing connections. It might show issues not related to the master that need to verify and correct. The document provided earlier on the S7-200 Modbus master programming is quite good, make sure you understand the setting of parameters for this data exchange, and follow the example shown for reading a 40000 address (holding register). Hope this helps, |
Last edited by: dchartier at: 10/25/2019 15:37:43 |
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