FB_GetHostAddrByName

 VAR_INPUT

VAR_INPUT
    sNetID    : T_AmsNetId;
    sHostName : T_MaxString := '';
    bExecute  : BOOL;
    tTimeout  : TIME := DEFAULT_ADS_TIMEOUT;
END_VAR

sNetID: Here a string containing the TwinCAT network address of the TwinCAT computer can be given, where the command have to be executed. The string can also be empty (default) for the local computer. 

sHostName: String containing host name. E.g. 'DataServer1'.

bExecute: The function block is activated by a positive edge at this input.

tTimeout: States the length of the timeout that may not be exceeded by execution of the command.

VAR_OUTPUT

VAR_OUTPUT
    bBusy   : BOOL;
    bError  : BOOL;
    nErrID  : UDINT;
    sAddr   : T_IPv4Addr := '';
    arrAddr : T_IPv4AddrArr := 0, 0, 0, 0;
END_VAR

bBusy: When the function block is activated this output is set. It remains set until and acknowledgement is received.

bError: If an error should occur during the execution of the command, then this output is set, after the bBusy output has been reset. 

nErrID: When the bError output is set, this variable supplies the ADS error code.

sAddr: String containing an (Ipv4) Internet Protocol dotted address. E.g. '172.16.7.199'

arrAddr: Byte array containing an (Ipv4) Internet Protocol dotted address.

Example in strutured text:

PROGRAM MAIN
VAR
    fbGet   : FB_GetHostAddrByName;
    bGet    : BOOL := TRUE;
    bError  : BOOL;
    nErrID  : UDINT;
    sIPv4   : T_IPv4Addr;(* Result: '87.106.8.100' *)
 arrIPv4     : T_IPv4AddrArr;
    state   : BYTE;
END_VAR

CASE state OF
0:
    IF bGet THEN
        bGet := FALSE;
        sIPv4 := '';
        fbGet( bExecute:= FALSE );
        fbGet( bExecute:= TRUE, sHostName := 'www.beckhoff.com' );
        state := 1;
    END_IF
1:
    fbGet( bExecute:= FALSE, bError=>bError, nErrID=>nErrID, sAddr=>sIPv4, arrAddr=>arrIPv4 );
    IF NOT fbGet.bBusy THEN
        state := 0;
    END_IF
END_CASE

Requirements