Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Scaricare il pdf (Pagina 63)

Program a sequential function chart Chapter 2

Use an expression to calculate a time

To calculate a time based on tags in your project, enter the time as a numeric

expression. You can use an expression to calculate these values.

• Preset

• LimitHigh

• LimitLow

Follow these steps to enter a time as an expression.

1. Click the

button of the step.

2. In the Step Properties dialog box, on the General tab, select the Use

Expression check box.

3. Click Define and enter an expression.

Browse for a tag

Choose a function

Choose an operator

Create a tag

4. Enter a numeric expression that defines the time. Use the buttons on the

right side of the dialog box to help you complete the expression.

5. Click OK.

6. To close the Step Properties dialog box, click OK.

Rock well Automati on Publication 1756-PM006F-EN-P - Oct ober 2014 63

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Pagina 63