SA0043: Use of a global variable in only one POU

Function	Determines global variables that are only used in one POU.
Reason	A global variable that is only used at one point should also be declared at this point.
Importance	Medium
PLCopen rule	CP26

Sample:

The global variable nGlobal1 is only used in the MAIN program.

Global variables:

VAR_GLOBAL
    nGlobal1  : INT;             // => SA0043
    nGlobal2  : INT;
END_VAR

Program SubProgram:

nGlobal2 := 123;

MAIN program:

SubProgram();
 
nGlobal1 := nGlobal2;