MEMSET
The function MEMSET allows PLC variables in a particular memory area to be set to a particular value.
Notice | |
System crash or access to unauthorized memory areas Since the function directly accesses the physical memory, special care must be taken when using it. Incorrect parameter values can result in a system crash, or in access to forbidden memory areas. |
MEMSET FUNCTION: UDINT
Inputs
VAR_INPUT
destAddr : PVOID;
fillByte : USINT;
n : UDINT;
END_VARName | Type | Description |
|---|---|---|
destAddr | PVOID | Start address of the memory area that is to be set. |
fillByte | USINT | Value of the filler byte. |
n | UDINT | Number of bytes to be set. |
The function fills n bytes with the fillByte values; starting from the memory area with the start address destAddr.
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:
PROGRAM MAIN
VAR
Buffer1 : ARRAY[0..3] OF BYTE;
SetResult : UDINT;
END_VAR
In the example, 4 bytes in Buffer1 are set to the value 0xAF.
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) |