Object ‘Transition’¶

Input support when generating inheriting POUs¶

When you doing object-oriented programming and using the inheritance (keyword EXTENDS) of POUs, you can get support as follows:

When you insert an action, a property, a method, or a transition below a POU derived from a base POU, the Add … dialog opens. Then the input field for the name extends to a list box. The list box contains a valid selection from the actions, properties, methods, or transitions available in the base POU. Now you can, for example, easily accept a method of the base POU and then adapt it to the derived function of the POU.

Methods and properties with the access modifier PRIVATE are not listed here because they are also not inherited. Methods and properties with the access modifier PUBLIC automatically get a blank access modifier field when accepting into the derived POU, which means the same thing functionally.

Example

See also

• Extension of Function Blocks

• Object-Oriented Programming

• Object ‘Action’

• Object ‘Property’

• Object ‘Method’

• Object ‘Transition’