Variables are used in CitectVBA to temporarily store data values. Variables let you assign a descriptive name to the data you are working with. You can create a variable once only in your code, and reference (refer to) it thereafter as many times as you like, by using its name in your code in place of the data value. Unlike constants, the value that a variable holds can be changed during the runtime of the project.
All variables declared within a CitectVBA
procedure (subroutine or function) have local scope to that
procedure only. Procedural level variables declared using the
Dim statement do not retain their
assigned values when dereferenced. Procedural level variables
declared using the
statement, however, retain their assigned values between
references, even after that procedure moves out of scope.
CitectVBA code used within a CitectSCADA command or expression field is treated as if the command or expression is a separate CitectVBA procedure. Variables declared within such a command procedure have procedural scope and lifetime, as described above.
Variables declared using the
staticstatement at the modular level (outside
any procedure) in a CitectVBA file, have modular scope to all
procedures within that same CitectVBA module (file). Modular level
staticvariables retain their
assigned values for the entire runtime of the project.
Variables declared (using the
at the modular level (outside any procedure) in a CitectVBA file
do, however, have global scope within the CitectSCADA project.
public statements are redundant at the modular
(global) level in CitectVBA, as they perform the exact same duty as