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• Create a "standard project" and select "CODESYS Control Win V3" as the device.
• Define the target system via Network search (see Modbus master).
• Insert an Ethernet adapter and a Modbus_TCP_Slave_Device in the device tree.
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Setting on the Ethernet adapter (master and slave)

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Setting on the Modbus_TCP_Slave (master)

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• Enter the IP address of the slave device (in this case the CODESYS Control Win V3)
• Issue a unique ID for the Modbus configuration
  

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Tab 'Channel'

• Create an input register (counter that is sent by the Modbus slave device) – cyclic update every 100 ms.
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• Create an output register for writing your own counter.
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I/O mapping

• Assign input and output variables.
  
  

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