Rockwell-automation 2098 CompactLogix Indexing Motion Accelerator Tool Manuel d'utilisateur télécharger pdf (Page 103)

Publication IASIMP-QS011B-EN-P — January 2009 103

CompactLogix Base Program Overview Appendix A

User-defined Data Types

The pre-configured Logix program uses pre-configured user-defined data types (UDT). These are

structures that organize data, status information, and commands for machine process and

equipment.

For example, this pre-configured UDT stores all the data for an axis, including speeds, accels,

decels, direction, and sequencers. A tag structure is created for each axis based on this data type.

Axis Data UDT Example

A UDT provides these advantages:

• One tag contains all of the data related to a specific aspect of your system. This keeps related

data together and easy to locate, regardless of its data type.

• Each individual piece of data (member) gets a descriptive name. This automatically creates an

initial level of documentation for your logic.

• You can use the data type to create multiple tags with the same data layout.

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Rockwell-automation 2098 CompactLogix Indexing Motion Accelerator Tool Manuel d'utilisateur Page 103