SA0048: AT declarations on direct addresses

Function	Determines AT declarations on direct addresses.
Reason	The use of direct addresses in the code is an error source and leads to poorer readability and maintainability of the code. We therefore recommend using the placeholders %I* or %Q*, for which TwinCAT automatically carries out flexible and optimized addressing.
Importance	High
PLCopen rule	N1/CP1

Samples:

PROGRAMM MAIN
VAR
    b1    AT%IX0.0 : BOOL;       // => SA0048
    b2    AT%I*    : BOOL;       // no error
END_VAR