How to create an array dynamically

2020-02-27T20:33:45.411000Z

Robkristiaan is correct but if you are trying to change an upper bound "globally" like inside functions you build in a library ect... You can use a global constant like:

VAR_GLOBAL CONSTANT

MAX_ALARM_INDEX :INT := 24;

END_VAR

then you can change it in one place in the global variables and use it like:

MyArray :ARRAY[0..MAX_ALARM_INDEX] OF INT;

Make sure you select (Check box) in the PROJECT-OPTIONS-BUILD menu "Replace Constants" other wise you will get a compile error.

This is the closest to getting a dynamic array allocation by replacing with a constant.

How to create an array dynamically

2020-02-27T20:33:41.447000Z

It is not possible to create a dynamic array,

CoDeSys allocates the memory at build time not at runtime.

How to create an array dynamically

2020-02-27T20:33:40.047000Z

Hello everybody,

it's possible to create an array dynamically?

I need to create something like this:

FUNCTION_BLOCK example

VAR_INPUT

_UpperBound: INT;

END_VAR

VAR_OUTPUT

END_VAR

VAR

MyArray :ARRAY[0..UpperBound] OF INT;

END_VAR

UpperBound :=_UpperBound;

PROGRAM MAIN

VAR

     x:INT;

     ex:example;

END_VAR

x := 3;

ex(_UpperBound := x);

Does someone can help me ?

Thanks for you help by advance.

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