ABB AC 31 - Page 15

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