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Establish a connection to the device that you want to link via Ethernet/IP.
In this example, a Wago controller (Ethernet/IP adapter) is used again.
The required steps are listed in this FAQ article:

Connecting to a WAGO Fieldbus Coupler via Ethernet/IP (IP scanner)

Your project should look like this:

CODESYS FAQ > Ethernet/IP: Setting the IP Address of a Remote Adapter > 1.png

Adapt the POU PLC_PRG as follows:

Declaration

VAR
    xSet                : BOOL;
    abyNewIp            : ARRAY [0..3] OF BYTE := [192, 168, 99, 139]; // = wrong IpAddr !!
    itfEthIpRmAdapter   : IoDrvEthernetIP.IRemoteAdapter2;
END_VAR

Implementation

IF xSet Then
    xSet := FALSE;
    itfEthIpRmAdapter := WAGO_750_352020_000_Ethernet_STD; // must be the exact name of the tree node
    itfEthIpRmAdapter.IPAddress := abyNewIp;        
END_IF

Download the modified project to the controller.
By setting the variable, the incorrect IP address is sent to the remote adapter and its connection is lost.

When the correct IP address is sent, the connection to the Ethernet/IP adapter is reestablished.