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9/15/2010 9:24 PM | |
Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (308) |
Hello, If the other system is a Modbus Master, our own system should be Modbus slave. The Modbus Master is the one that lauches requests (read requests, write request). The slaves executes the requests (sending requested data, accepting written data). In addition to the Modbus slave driver, the Modbus slave connection requires a special communication FB in the S7 CPU. The Modbus communication FB processes all the functions required for the connection. FB 81 (S_MODB) receives the Modbus protocol and converts the Modbus addresses into SIMATIC memory areas. FB81 uses a Modbus data conversion table located in the data block to map the Modbus addresses onto the SIMATIC S7 memory areas. In this manual, chapter 3.6 you will find the details of the slave driver. |
Last edited by: jklm at: 9/15/2010 9:24 PMBest regards |
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