SA0047: Access to direct addresses

Function	Determines direct address access operations in the implementation code.
Reason	Symbolic programming is always preferred: A variable has a name that can also have a meaning. An address does not provide an indication of what it is used for.
Importance	High
PLCopen rule	N1/CP1

Samples:

PROGRAM MAIN
VAR 
    bBOOL  : BOOL;
    nBYTE  : BYTE;
    nWORD  : WORD;
    nDWORD : DWORD;
END_VAR

bBOOL  := %IX0.0;                // => SA0047
%QX0.0 := bBOOL;                 // => SA0047
%QW2   := nWORD;                 // => SA0047 
%QD4   := nDWORD;                // => SA0047 
%MX0.1 := bBOOL;                 // => SA0047
%MB1   := nBYTE;                 // => SA0047 
%MD4   := nDWORD;                // => SA0047