F_iecCopyStreamToStream

Syntax

FUNCTION F_iecCopyStreamToStream: UDINT
VAR_INPUT
    cbCopy  : UDINT;
END_VAR
VAR_IN_OUT
    target  : ST_IEC870_5_101Stream;
    source  : ST_IEC870_5_101Stream;
END_VAR

Inputs

cbCopy: Number of bytes to be copied from the source variable to the target variable.

Inputs/outputs

target: Target data buffer.

source: Source data buffer.

Sample in ST

A rising edge at bCopy results in incrementing of srcValue, followed by copying to srcStream. Then, the first 4 data bytes are copied from srcStream to dstStream. Finally, the first 4 data bytes are copied from dstStream to the dstValue variable.

PROGRAM P_iecCopyStreamToStream
VAR
    srcStream   : ST_IEC870_5_101Stream;
    srcValue    : DWORD;

    dstStream   : ST_IEC870_5_101Stream;
    dstValue    : DWORD;

    bCopy       : BOOL;
END_VAR

IF bCopy THEN
    bCopy := FALSE;
    srcValue := srcValue + 1;
    F_iecCopyBufferToStream( ADR( srcValue ), SIZEOF( srcValue ), srcStream );
    F_iecCopyStreamToStream ( SIZEOF( srcValue ), dstStream, srcStream );
    F_iecCopyStreamToBuffer( ADR( dstValue ), SIZEOF( dstValue ), dstStream );
END_IF

Memory representation of the srcStream and dstStream variables after the first F_iecCopyStreamToStream function call:

Memory representation of the srcStream and dstStream variables after the second F_iecCopyStreamToStream function call:

Requirements