Controller Properties dialog box - SFC Execution tab
The Controller Properties dialog box displays controller configuration information for the open project and, when online, for the attached controller. Use the
SFC Execution
tab to configure project-wide sequential function chart execution.
The ability to change the settings on this tab can be controlled by
FactoryTalk Security
permissions.Parameters
Execution Control
Select the option to use to configure when sequential function chart execution returns to the controller’s operating system.
- Execute current active steps only. Execute the currently active step(s) and then return.
- Execute until FALSE transition. Execute the currently active step(s) and then, if the chart is ready, advance the state and continue executing. The routine will not return until the chart is unable to advance. This could be due to a false transition or a simultaneous converge where all of the steps have not yet reached their bottom-most step.This configuration can reduce the number of scans to complete, for example, machine initialization. However, because multiple steps can be processed in a single scan, this configuration could lead to a watchdog timeout.
Restart Position
Select the option to use to configure where a sequential function chart begins executing after a transition from Program mode to Run mode. Choose from:
- Restart at most recently executed step- Begin executing at the step(s) that was executing when the controller was switched out of Run mode, or upon power up.
- Restart at initial step- Begin executing at the initial step, regardless of what step(s) was executing when the controller was switched out of Run mode.
Last Scan of Active Steps
Select the option to use to configure how the controller scans actions that are transitioning from active to inactive, if at all. Choose from:
- Automatic reset- The controller scans actions one last time in post-scan mode
- Programmatic reset- The controller scans actions one last time with the corresponding step’s last scan (LS) bit set.
- Don’t scan- The controller does not scan actions one last time.
Provide Feedback