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Section 1 Specifications
<Initialization of derived data type variable>
For derived data type variable, such as array variable and structure variable, no initial value can be set on the variable
worksheet. The assignment of initial value to derived data type variable is made by application program.
<Sample variable declaration>
<Sample initialization program in ST language>
(3) Restrictions on derived data types
•
Derived data types can be assigned no initial values in their declarations. Initialize array/structure data type variables by an
application program.
•
Derived data type variable cannot be overwritten online.
•
Neither array data type variables nor structure data type variables can be monitored on the program. Therefore, when
debugging a program that references array data type or structure data type variables, it is necessary to register them with the
watch list and debug the program using the watch list.
• If the value for a variable is out of the range of array elements specified in the data-type definition when array numbers are
specified using variables, data at the highest or lowest array element number are accessed.
