→Initial value

according to →IEC-standard: value assigned to a →variable at system start-up

If a variable has no initial value assigned, the initial value of the appropriate →data type is used (of the user-defined or elementary data type). The default initial values for the elementary data types are listed under "Supported data types".
If a →reference variable is not initialized, the value NULL is applied (i.e., the reference refers to nothing).

The ST-syntax for initial values is listed under "Initialization of variables in ST". A graphical editor provides the list of the declared variable in order to enter or change the initial value .