Order of Execution
The order of execution of programs within a project is determined from the Cycle window.
The order of execution is always
- High Priority
- SFC
"Sequential function chart"
It can be used to program processes that can be split into steps.
The main components of SFC are:
- Steps with associated actions
- Transitions with associated logic conditions
- Directed links between steps and transitions Section - Normal Priority
The order within each grouping is determined by the vertical ordering. Using the image above, the order of execution for Normal Priority programs is:
- UntitledFBD
- UntitledST1
- UntitledFBD1
For more information see Define the PLC Cycle.
