Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Manual do Utilizador descarregar pdf (Página 50)

Chapter 2 Organize tags

3. In the cell, click .

4. Select the tag that the alias represents.

To Do This

Select a tag Double-click the tag name.

Select a bit number 1. Click the tag name.

2. To the right of the tag name, click +.

3. Click

the required bit.

5. Click another cell.

If you want an instruction to access different elements in an array, use a tag in the

subscript of the array (an indirect address). By changing the value of the tag, you

change the element of the array that your logic references.

The following table outlines some common uses for an indirect address.

To Use a tag in the subscript and

Select a recipe from an array of recipes Enter the number of the recipe in the tag.

Load a specific machine setup from an array of possible

setups

Enter the desired setup in the tag.

Load parameters or states from an array, one element at a

time

A. Perform the required action on the first element.

B. Use an ADD instruction to increment the tag value and

point to the next element in the array.

Log error codes

Perform several actions on an array element and then index

to the next element

The following example loads a series of preset values into a timer, one value (array

element) at a time.

Indirect addresses

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Rockwell-automation Logix5000 Controllers I/O and Tag Data Programming Manual do Utilizador Página 50