What is the difference between the clock data in LS area and that in the system variable?
The clock data inside LS area can both write and read, however, the clock data in the system variable is the area for read only.
For example, you can rewrite the value of the LS area’s clock data (it is Month in the left picture), however, you cannot rewrite the value of the system variable #Month.
It is a variable to use for Logic Program by using the compare instruction, or to use by displaying on the Numeric Display