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- MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b, December 28, 2006. http://www.modbus.org
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The attached ZIP contains the configuration of two lines and two stations with the Modbus Client/Modbus Server protocol that communicate via TCP (Modbus Server listens on a TCP port 9999). Data written through one line is received through the other line. Four I/O tags are configured on each line (Float, with address 3.0, Signed with addresses 4.0 and 4.1, and Bool with address 1.0). Modbus Server I/O tags values are controlled by the system second (Sec) and use linear conversion (Float is divided by 1000, Signed with address 4.0 is multiplied by 10). The value of the Bool I/O tag is controlled by the eval tag P.TrueFalse, which changes the value True/False every second.
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You can read blogs about the Modbus protocol |
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