SA0013: Declarations with the same variable name

Function	Determines variables with the same name as other variables (example: global and local variables with the same name), or the same name as functions, actions, methods or properties within the same access range.
Reason	Identical names can be confusing when the code is read and can lead to errors if the wrong object is accessed accidentally. We therefore recommend using naming conventions that avoid such situations.
Importance	Medium
PLCopen rule	N5/N9

Samples:

Global variable list GVL_App:

VAR_GLOBAL
    nVar  : INT;
END_VAR

MAIN program, containing a method with the name Sample:

PROGRAM MAIN
VAR
    bVar    : BOOL; 
    nVar    : INT;               // => SA0013 
    Sample  : DWORD;             // => SA0013 
END_VAR

.nVar := 100;                    // Writing global variable "nVar"
nVar  := 500;                    // Writing local variable "nVar"

METHOD Sample
VAR_INPUT
…