Technical data

Basics of Designing a Program Structure
4.2 Blocks in the User Program
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 75
Type of Interrupt Organization Block Priority Class
(Default)
See also
Synchronous
errors
OB121 Programming Error
OB122 Access Error
Priority of the OB
that caused the
error
Error Handling Organization Blocks
(OB70 to OB87 / OB121 to OB122)
1)
The priority class 29 corresponds to priority 0.29. The background cycle has a lower priority than the free
cycle.