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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 Netzwork 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.



    Info

    Pay attention that the address is the the same as for the Modbus Slave Device.



  • Adapt the POU PLC_PRG as follows:


    Section
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    width7

    Declaration

    Column
    width93
    Code Block
    themeConfluence
    VAR
    xUpdate        :    BOOL;    
    sIp            :    STRING;
    udiResult      :    UDINT;
    abyNewIp       :    ARRAY [0..3] OF BYTE := [192,168,99,198]; // Insert here the correct IP-Address of the Modbus_Slave_Device
END_VAR



    Section
    Column
    width7

    Implementation

    Column
    width93
    Code Block
    themeConfluence
    sIp := IoDrvEthernet.IPARRAY_TO_IPSTRING(Modbus_TCP_Slave.ComSettings.ipAddress);
Modbus_TCP_Slave.xConfirmError := FALSE;

IF xUpdate THEN
    xUpdate := FALSE;    
    udiResult := Modbus_TCP_Slave.UpdateCommunicationSettings(ipAddress := abyNewIp, uiPort := 502);    
    Modbus_TCP_Slave.xConfirmError := TRUE;
END_IF



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