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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 a visualization in the device tree.
Then the Visualization Manager is inserted with the visu types TargetVisuand WebVisu.
In addition, a Visu_Task is also created automatically.

As of SP17:

Open the Library Manager and add the following libraries:
VisuUtils
Create a new FB named FB_Iteration and implement the interface VU.IVisualizationClientIteration.

The following methods are created automatically with the FB:
EndIteration
HandleClient
StartIteration

Adapt the FB_Iteration function block as follows:

Declaration

FUNCTION_BLOCK FB_Iteration IMPLEMENTS VU.IVisualizationClientIteration
VAR CONSTANT
	c_MaxClients	: __XINT := 5;
END_VAR
VAR
	_iIndex			: __XINT;
	asIpAddresses	: ARRAY [0..c_MaxClients-1] OF STRING;
END_VAR

Adapt the EndIteration method as follows:

Declaration

METHOD EndIteration
VAR
	_iCounter : __XINT;
END_VAR

Implementation

FOR _iCounter := (c_MaxClients - 1) TO _iIndex BY -1 DO
	asIpAddresses[_iCounter] := '';
END_FOR

Adapt the HandleClient method as follows:

Implementation

IF _iIndex <= (c_MaxClients - 1) THEN
	asIpAddresses[_iIndex] := itfClient.GetIPv4Address();
	_iIndex := _iIndex + 1;
END_IF

Adapt the StartIteration method as follows:
Implementation
_iIndex := 0;

Adapt the POU PLC_PRG as follows:

Declaration

VAR
    fbIteration         : FB_Iteration;
    fbIterateClients    : VU.FbIterateClients;	
	xIterate			: BOOL;
END_VAR

Implementation

fbIterateClients(xExecute := xIterate, itfClientFilter := VU.Globals.OnlyWebVisu, itfIterationCallback := fbIteration);

IF fbIterateClients.xDone  THEN
	xIterate := FALSE;
END_IF

Start the project and insert the variable PLC_PRG.fbIteration in the watch list.
Open a browser and type in the following address: http://localhost:8080/webvisu.htm
Set the PLC_PRG.xIterate variable to TRUE.

Up to SP16:

Create a new POU named ClientInfo and call it from Visu_Task.

The call of the ClientInfo POU must originate from the Visu_Task because only then is the required client handle passed.

Adapt the ClientInfo POU as follows:

Declaration

VAR
    pClient       :    POINTER TO VisuElems.VisuElemBase.VisuStructClientData;
    helper        :    VisuElems.VisuFbClientTagDataHelper;
    s1            :    STRING;
END_VAR

Implementierung

VisuElems.g_ClientManager.BeginIteration();

WHILE (pClient := VisuElems.VisuElemBase.g_ClientManager.GetNextClient()) <> 0 DO
    IF pClient^.GlobalData.ClientType = VisuElems.VisuElemBase.Visu_ClientType.WebVisualization THEN
        helper(pClientData := pClient);
        s1 := helper.stIPv4;
    END_IF
END_WHILE

Start the project and set a breakpoint in line 6 of the ClientInfo POU.
Open a browser and type in the following address: http://localhost:8080/webvisu.htm
After the client has connected, execution is halted at the breakpoint and the IP address can be read.

The information is available only for web clients. A TargetVisu connected to the controller does not contain this information.