Variable types and special variables

The variable type defines how and where you can use the variable. The variable type is defined during the variable declaration.

Additional information
Local Variables - VAR
Input Variables - VAR_INPUT
Output Variables - VAR_OUTPUT
Input/Output Variables - VAR_IN_OUT, VAR_IN_OUT CONSTANT
Global Variables - VAR_GLOBAL
Temporary Variable - VAR_TEMP
Static Variables - VAR_STAT
External Variables - VAR_EXTERNAL
Instance Variables - VAR_INST
Remanent Variables - PERSISTENT, RETAIN
Variable types - attribute keywords