Using POUs for Implicit Checks
CODESYS provides special POUs which implement implicit monitoring functions. At runtime, these functions check the limits of arrays or subrange types, the validity of pointer addresses, and division by zero.
In the device tree, select the Application object.
Click .
The Add POU for Implicit Checks dialog opens.
Select the desired functions.
Click the Add button.
The selected POUs are inserted below the Application in the device tree.
Open the POUs in the editor.
Adapt the implementation suggestion to your requirements.
Caution
To get the feature for monitoring functions, do not edit the declaration part. However, you are permitted to add local variables.