MEMSET

MEMSET 1:

The function MEMSET allows PLC variables in a particular memory area to be set to a particular value.

FUNCTION MEMSET : UDINT

VAR_INPUT
    destAddr  :UDINT;
    fillByte  :USINT;
    n         :UDINT;
END_VAR

destAddr: start address of the memory area that is to be set.

fillByte: value of the filler byte.

n: number of bytes to be set.

The function fills n bytes in the memory area that starts at address destAddr with the value specified by fillByte.

Return parameter	Meaning
0	Incorrect parameter values. destAddr == 0 or n == 0
> 0	If successful, the number of bytes that have been set (n).

Example of a call in FBD

VAR
    Buffer1    : ARRAY[0..3] OF BYTE;
    SetResult  : UDINT;
END_VAR

MEMSET 2:

In the example, 4 bytes in Buffer1 are set to the value 0xAF.