Technical data

Basics of Designing a Program Structure
4.2 Blocks in the User Program
Programming with STEP 7
104 Manual, 05/2010, A5E02789666-01
Priority of the Cyclic Interrupt OBs
The following table shows the default intervals and priority classes of the cyclic interrupt OBs. You
can assign parameters to change the interval and the priority class.
Cyclic Interrupt OB Interval in ms Priority Class
OB30 5000 7
OB31 2000 8
OB32 1000 9
OB33 500 10
OB34 200 11
OB35 100 12
OB36 50 13
OB37 20 14
OB38 10 15