Introduction to the language objects of the application-specific step by step axes control function

General

The IODDTs are predefined by the manufacturer. They contain input/output language objects belonging to a channel of an application-specific module.

Step by step axis modules have an associated IODDT.

There is an IODDT type for the application-specific axis:

NOTE: IODDT variables can be created in two different ways:

Language object types

This IODDT contains a set of language objects that enable their operation to be controlled and verified.

There are two types of language object:

implicit exchange objects, which are automatically exchanged on each cycle revolution of the task associated to the module,
explicit exchange objects, which are exchanged at the request of the application, using explicit exchange instructions.

The explicit exchanges concern the inputs/outputs of the module: measurement results, information and commands.

The explicit exchanges are used for the parametering and diagnostics of the module.