Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Manuale Utente Scaricare il pdf (Pagina 40)

Chapter 2 Organize tags

Guidelines for user-defined data types

When you create a user-defined data type, use the following guidelines.

• If you include members that represent I/O devices, you must use logic to

copy the data between the members in the structure and the corresponding

I/O tags. Refer to Address I/O data on page 18

• If you include an array as a member, limit the array to a single dimension.

Multi-dimension arrays are not permitted in a user-defined data type.

• When you use the BOOL, SINT, or INT data types, place members that

use the same data type in sequence.

More Efficient Less Efficient

BOOL

BOOL DINT

BOOL BOOL

DINT DINT

DINT BOOL

Create a user-defined data type

1. In the Controller Organizer, expand Data Types, then right-click User-

Defined and then click New Data Type.

2. In the Data Type Editor, in the Name box, type a name for the user-

defined data type.

3. (optional) In the Description box, type a description for the user-defined

data type.

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Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Manuale Utente Pagina 40