Operands¶

Constants¶

You declare constants with the keyword CONSTANT. Constants can be either local or global.

Syntax:

VAR CONSTANT <identifier>:<Type> := <initialization>; END_VAR

• BOOL Constants
• TIME Constants
• DATE Constants
• DATE_AND_TIME Constants
• TIME_OF_DAY Constants
• Numeric Constants
• REAL/LREAL Constants
• String Constants
• Typed Literals

See also

• 26fbe6a158721888c0a8640e00a479cd-ID_d533d252c37bd547c0a864635eea2380

Variables¶

You declare variables as local or global in the declaration section of a POU or in a global variable list.

The position where you can use a variable depends on its data type.

See also

• Access to Variables in Arrays, Structures, and Blocks
• Bit Access to Variables
• 26fbe6a158721888c0a8640e00a479cd-ID_d533d252c37bd547c0a864635eea2380
• Declaring Variables

Other¶

• Addresses
• Functions