Event sources Possible priorities (default
priority)
Possible OB num
bers
Default system
response
1)
Number of OBs
Time error Ignore
Maximum cycle time exceeded
22 80
Depends on system
state
2)
0 or 1
Diagnostics interrupt 2 to 26 (5) 82 Ignore 0 or 1
Removal/insertion of modules 2 to 26 (6) 83 Ignore 0 or 1
Rack error 2 to 26 (6) 86 Ignore 0 or 1
Programming error (only for
global error handling)
2 to 26 (7) 121 STOP 0 or 1
I/O access error (only for global
error handling)
2 to 26 (7) 122 Ignore 0 or 1
1)
If you have not configured the OB.
2)
See section "Response of S7-1500R/H redundant system when cycle time is exceeded"
Response to start events
The occurrence of a trigger results in the following response:
•
If the event comes from an event source to which you have assigned an OB, this event
triggers the execution of the assigned OB. The event enters the queue according to its
priority (exception: hardware interrupts).
•
If the event comes from an event source to which you have not assigned an OB, the CPU
executes the default system reaction.
NOTE
Some event sources, such as startup, pull/plug, exist even if you do not configure them.
Response of OB72 and OB86 to system state transitions
If an IO device has failed, the OB86 reports a "rack failure" if programmed. OB72 "CPU
redundancy error" reports a loss of redundancy in the redundant system or failure of the
redundant synchronization.
221
Basics of program execution
9.3 Events and OBs
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
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