FB_XmlSrvRead

VAR_INPUT

VAR_INPUT
    sNetId      : T_AmsNetId; 
    ePath       : E_OpenPath := PATH_GENERIC; 
    nMode       : WORD := XMLSRV_SKIPMISSING;
    pSymAddr    : DWORD;
    cbSymSize   : UDINT;
    sFilePath   : T_MaxString;
    sXPath      : T_MaxString;
    bExecute    : BOOL; 
    tTimeout    : TIME := T#60s; 
END_VAR

sNetId: String containing the network address of the TwinCAT XML Data Server. For the local computer (default) an empty string may be specified.

ePath: This input can be used to select a TwinCAT system path on the target device for opening the file.

nMode: This input can be used to influence how the XML file is analyzed. For the XmlSrvRead command, only XMLSRV_SKIPMISSING mode is currently supported.

pSymAddr: Address of the PLC variable to which the data from the XML file are to be written.

cbSymSize: Size of the PLC variable to which the data from the XML file are to be written.

sFilePath: Contains the path and file name for the file to be opened. Note: The path can only point to the local computer’s file system! This means that network paths cannot be used here!

sXPath: Contains the address of the tag in the XML document from which the data are to be written. The address must be a valid XPath instruction. The name of the tag must be different from the name of the symbol.

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

tTimeout: Maximum time allowed for the execution of the function block.

VAR_OUTPUT

VAR_OUTPUT
    bBusy   : BOOL;
    bError  : BOOL;
    nErrId  : UDINT;
END_VAR

bBusy: This output is set when the function block is activated. It remains set until feedback is received.

bError: This output is set up after the bBusy output has been reset if there has been an error in transmission of the command.

nErrId : If the bError output is set, this parameter returns the TwinCAT XML Data Server error number.

Requirements