Local variables

A local Cicode variable is only recognized by the function within which it is declared, and can only be used by that function. You need to declare local variables before you can use them.

Any variable defined within a function (that is, after the function name) is a local variable, therefore no prefix is needed. Local variables are destroyed when the function exits.

Local variables take precedence over global and module variables. If you define a local variable in a function with the same name as a global or module variable, the local variable is used; the global/module variable is unaffected by the function. This situation should be avoided, however, as it is likely to cause confusion.

Local Variables and Variable Tags

Local variables have limited functionality compared with variable tags. Limitations are:

• Qualities of Override, OverrideMode, ControlMode and Status elements are showing Bad with extended substatus QUAL_EXT_INVALID_ARGUMENT. Writing to the elements returns error CT_ERROR_INVALID_ARG.
• Values of Override, OverrideMode, ControlMode and Status elements are showing 0.
• Respective timestamps and quality of Field, Valid and default elements are the same.
• Field, Valid and default elements can be read.
• Field and default elements can be written.

See Also

Variable Scope Standards