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Page 1-8
Presentation / operation
Input acquisition
RUN
Program processing
Outputs update
Communication along
the bus and with the
extensions
Figure 1-4 : The program execution cycle
Main program
Sub-program 1
Sub-program 12
Figure 1-5 : Task priorities
STOP
Forcing the
outputs to 0
interruptions
maximum of 12
sub-programs
ascending priority order
Event based
Periodic
interruptions
ABB Control - AC 31
1SBC 260400 R1001-b
06.99
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