Compiler Error C0144

Message: Inheritance only allowed in function blocks, Interfaces and Structures

Possible error cause: An attempt is made to use inheritance in an object that does not permit inheritance.

Error correction: Use EXTENDS in function blocks, interfaces, and structures only.

Example 401. Example of the error:

PROGRAM PLC_PRG
VAR
    inst : DUT_1;
END_VAR

TYPE DUT:
(
    enum_member := 0
);
END_TYPE

TYPE DUT_1 EXTENDS DUT:
(
    enum_memberX := 0
);
END_TYPE

Message:

C0144: Inheritance only allowed in function blocks, Interfaces and Structures