MEMMOVE

MEMMOVE 1:

The function MEMMOVE can be used to copy the values of PLC variables from one memory area to another.

FUNCTION MEMMOVE : UDINT

VAR_INPUT
    destAddr : PVOID;
    srcAddr  : PVOID;
    n        : UDINT;
END_VAR

Name

Type

Description

destAddr

PVOID

Start address of the destination memory area.

srcAddr

PVOID

Start address of the source memory area.

n

UDINT

Number of bytes to be copied.

The function copies n bytes from the memory area with the start address srcAddr to the memory area with the start address destAddr.

Return parameter

Meaning

0

Incorrect parameter values. destAddr == 0 or srcAddr==0 or n == 0

> 0

If successful, the number of bytes copied (n).

Example of a call in FBD:

PROGRAM MAIN
VAR
    Buffer1    : ARRAY[0..3] OF BYTE;
    Buffer2    : ARRAY[0..3] OF BYTE;
    MoveResult : UDINT;
END_VAR

MEMMOVE 2:

In the example, 4 bytes are moved from Buffer2 to Buffer1.

Requirements

Development environment

Target system type

PLC libraries to include (Category group)

TwinCAT v3.1.0

PC or CX (x86, x64, ARM)

Tc2_System (System)