VAR CONSTANT
    c_wMaxTelegram  : INT := 15;
END_VAR
VAR
    ipAddress       : NBS.IPv4Address;
    fbTcpConnection : NBS.TCP_Connection;
    fbTcpServer     : NBS.TCP_Server;
    fbTcpRead       : NBS.TCP_Read;
    fbTcpWrite      : NBS.TCP_Write;
          
    abyRx           : ARRAY [0..gvlSetting.gc_wMaxTelegram] OF BYTE;
    abyTx           : ARRAY [0..gvlSetting.gc_wMaxTelegram] OF BYTE;
     
    iIndex          : INT;
    xRead           : BOOL := TRUE;
    xWrite          : BOOL := TRUE;
    xAckTelegram    : BOOL;
    xBlockAck       : BOOL;
    udiRead         : DINT;
END_VAR
IF fbTcpRead.xReady THEN
    IF (fbTcpRead.udiCount = (gvlSetting.gc_wMaxTelegram + 1)) THEN
        IF ((abyRx[0] = 87) AND  (abyRx[1] = 68) AND (abyRx[2] = 58) AND (abyRx[3] = 32)) THEN // 'WD: ' = Watchdog-Telegram
            FOR iIndex := 0 TO c_wMaxTelegram DO
                abyTx[iIndex] := 0
            END_FOR
            // 'ACK: ' = Acknowledge-Telegram
            abyTx[0] := 65;
            abyTx[1] := 67;
            abyTx[2] := 75;
            abyTx[3] := 58;
            abyTx[4] :=  0" class="post-container bg-white pb-3" style="min-height:360px;">

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