• Create a "Standard project" and select CODESYS Control Win V3 as the device.
  • Define the target system by means of the Network scan.



  • Open the Library Manager and add the SysSocket library.



  • Adapt the POU PLC_PRG as follows:

    Declaration

    VAR
    xCheckDevice    :    BOOL;
    sIpAddr         :    STRING := '192.168.99.198';
    udiReplayAverage:    UDINT;
    tTimeout        :    TIME := T#50MS; // Must greather than 25 ms => minimum in the function!!
    xConnected      :    BOOL;
END_VAR

    Implementierung

    IF xCheckDevice THEN
    xCheckDevice := FALSE;
    IF SysSocket.SysSockPing(szIPAddress := sIpAddr, ulTimeout := TIME_TO_UDINT(tTimeout), pulReplyTime := ADR(udiReplayAverage)) = 0 THEN
        xConnected := TRUE;
    ELSE
        xConnected := FALSE;    
    END_IF
END_IF

    Depending on the operating system, the function has different minimum runtimes.
    Therefore, timeout times of 25 milliseconds or more should be used.
    In this way, it is appropriate to outsource the function call in a separate task whenever possible.

  • Start the project and set the xCheckDevice variable to TRUE.