Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Manuale Utente Scaricare il pdf (Pagina 38)

Chapter 2 Organize tags

User-defined data types (structures) let you organize your data to match your

machine or process.

Example: User-defined data type that stores a recipe.

In a system of several tanks, each tank can run a variety of recipes. Because the recipe requires a mix of data types (REAL, DINT, BOOL, so forth), a user-defined data

type is used.

An array that is based on this data type looks like this example.

Item Description

Array of recipes

First recipe

Members of the recipe

Array containing three elements of the TANK data type

User-defined data types

38 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 85 86

Programming Manual 1
Important user information 2
Summary of changes 3
Table of Contents 5
Chapter 3 6
Chapter 4 6
Data access control 6
Preface 9
Studio 5000 environment 9
Additional resources 10
Communicate with I/O modules 11
Requested packet interval 12
Communication format 12
Ownership 14
Electronic Keying 15
Exact Match 16
Compatible Module 16
Disable Keying 17
More information 17
Address I/O data 18
Buffer I/O 19
Organize tags 21
Tag type 22
Data type 23
Tag scope 25
Program parameter scope 27
Guidelines for tags 27
Create a tag 31
Create an array 34
Configure an array 37
User-defined data types 38
Organize tags Chapter 2 41
Chapter 2 Organize tags 42
Describe a user-defined 44
Address tag data 47
Alias tags 47
Display alias information 49
Assign an alias 49
Indirect addresses 50
Expressions 51
Array subscript out of range 52
Tag documentation 53
Force I/O 55
Check force status 56
Force status indicator 57
GSV instruction 57
When to use I/O force 58
Add an I/O force 59
Remove or disable forces 60
Disable all I/O forces 61
Remove all I/O forces 61
Configure external access 64
4. Click OK 66
Find a base tag with Go To 69
External access availability 70
User-defined type 71
Add-on instructions 73
Tag mapping 76
Imported tag behavior 76
Constant value tags 76
Configure constant tags 77
Constant check box 80
Rockwell Automation support 86

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