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Create a "Standard project" and select CODESYS Control Win V3 as the device.
Define the target system by means of the Network scan.
Insert an Ethernet adapter in the device tree and specify the interface to be used.

Note
If a target system is not defined yet, then the error message "Gateway not configured" is displayed.
Insert a Modbus TCP Master below the Ethernet adapter in the device tree.
Insert a Modbus TCP Slave below the Modbus TCP Master in the device tree.
Insert it in the Modbus Slave Channel tab and set the properties as follows:

Adapt the POU PLC_PRG as follows:

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Declaration

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VAR
    xExec                :    BOOL;
    wMasterSend          :    WORD := 100;
    mbChannel            :    ModbusChannel;
END_VAR

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Implementation

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Code Block

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mbChannel(slave := Modbus_TCP_Slave, xExecute := xExec);

Assign the variable wMasterSend to the output Channel 0[0] in the tab ModbusTCPSlave I/O Mapping.

Image Modified

Info
Please note, that under the ModbusTCPSlave I/O Mapping tab, the 'Always update variables' is set to 'Enabled 1' : Image Added See also our OLH for Basic settings with Fieldbus Devices and I/O Drivers.

Start the project and set the variable xExecute to TRUE so that the new value is passed to the slave.

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