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Page 79
Exercise 8:
Using User-Defined Structures and Arrays
In this exercise, you will learn how to use user-defined structures and arrays.
Follow the steps below to complete Exercise 8.
Place a checkmark in the square next to each step as you
complete it.
This will help you keep your place as you work through the steps.
Opening the Controller File and Examining the Cookie Recipe
Open the controller file and examine the cookie recipe that you will use to learn about user defined structures
and arrays.
1. Open the controller file
UserDefined.ACD
.
2. Click on the
+
to the left of the
Data Types
folder to expand it.
If the folder is already expanded there will be a
‘-‘
to the left of it.
3. Click on the
+
to the left of the
User-Defined
folder to expand it.
4. Double click on the
CookieRecipe
item.
The screen appears as shown below.
As you can see, the User Defined Structure, CookieRecipe, contains another User Defined Structure
named CookingInstructions. The other elements in CookieRecipe are all of the ingredients being used
for each type of cookie.
5. Click on the
+
to the left of the
CookingInstructions
folder to expand it.
As you can see, CookingInstructions contains two fields: a time and a temperature.
6. Click on
Cancel
to close this window.
Allen-Bradley Parts
