F_iecCopyBufferToStream

Syntax

FUNCTION F_iecCopyBufferToStream: UDINT
VAR_INPUT
    pBuffer : PVOID;
    cbBuffer: UDINT;
END_VAR
VAR_IN_OUT
    stream  : ST_IEC870_5_101Stream;
END_VAR

Inputs

pBuffer: Pointer (address) of an external buffer variable.

cbBuffer: Number of data bytes to be copied from the external buffer variable to the stream variable.

Inputs/outputs

stream: Target data buffer.

Sample in ST

A rising edge at bTx results in copying of 2 x 4 data bytes from the txBuffer variable to the stream variable.

PROGRAM P_iecCopyBufferToStream
VAR
    stream   : ST_IEC870_5_101Stream;
    txBuffer : ARRAY[0..3] OF BYTE := [1, 2, 3, 4];
    cbResult : UDINT;
    bTx      : BOOL;
END_VAR

IF bTx THEN
    bTx := FALSE;
    cbResult := F_iecResetStream( 0, stream );
    cbResult := F_iecCopyBufferToStream ( ADR( txBuffer ), SIZEOF( txBuffer ), stream );
    cbResult := F_iecCopyBufferToStream ( ADR( txBuffer ), SIZEOF( txBuffer ), stream );
END_IF

Memory representation of the stream variable before the first function call:

Memory representation of the stream variable after the first function call:

Memory representation of the stream variable after the second function call:

Requirements