Rockwell Automation Logix5000 Controllers Sequential Function Charts Programming Manual - Manual (Page 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.
Rockwell Automation Publication 1756-PM006F-EN-P - October 2014 63