Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Scaricare il pdf (Pagina 62)

Chapter 2 Program a sequential function chart

Location to which the wire goes

Assign the preset time for a step

1. Click the button of the step.

2. In the Step Properties dialog box, on the General tab, in the Preset box,

enter the time for the step, in milliseconds.

3. Click OK.

When the step is active for the preset time (Timer = Preset), the DN bit of the

step turns on.

To calculate the preset time for a step at runtime, see

Use an expression to

calculate a time on page 63.

Configure alarms for a step

Follow these steps to turn on an alarm if a step executes too long or not long

enough.

1. Click the button of the step.

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

Enable check box.

3. Enter the time for the high alarm (Limit High) and low alarm (Limit

Low), in milliseconds.

4. Click OK.

Configure a step

62 Rockwell Automation Publication 1756-PM006F-EN-P - October 2014

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Rockwell-automation Logix5000 Controllers Sequential Function Charts P Manuale Utente Pagina 62