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Appendix B
Running Programs with Micro800
Guidelines and Limitations
38
Execution Rules
This section illustrates the execution of a program. The execution follows eight
main steps within a loop. The loop duration is a cycle time for a program.
1. Scan input variables
2. Consume bound variables
3. Execute POUs
4. Produce bound variables
5. Update output variables
6. Save retained values
7. Process IXL messages
8. Sleep until next cycle
Here are some guidelines and limitations to consider when programming a
Micro800 controller using Connected Components Workbench (CCW)
software:
• Each program/Program Organizational Unit (POU) can use up to 64 Kb
of internal address space. It is recommended that you split large programs
into smaller programs to improve code readability, simplify debugging and
maintenance tasks.
Rockwell Automation Publication 2080-UM001B-EN-E - November 2011
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