Events And Obs - Siemens Simatic S7-1500R System Manual

7.3

Events and OBs

Start events
The table below gives an overview of the possible event sources for start events and their
OBs:
Table 7- 2 Start events
Event sources
Startup
Cyclic program
Time-of-day interrupt
Time-delay interrupt
Cyclic interrupt
Hardware interrupt
CPU redundancy error
Time error
Maximum cycle time exceed-
ed
Diagnostics interrupt
Removal/insertion of mod-
ules
Rack error
Programming error (only for
global error handling)
I/O access error (only for
global error handling)
If you have not configured the OB.
1)
See section "Response of S7-1500R/H redundant system when cycle time is exceeded"
2)
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
default system response is executed.
Note
Some event sources, such as startup, pull/plug, exist even if you do not configure them.
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
Possible priorities (default
priority)
1
1
2 to 24 (2)
2 to 24 (3)
2 to 24 (8 to 17, frequency
dependent)
2 to 26 (18)
2 to 26 (26)
22
2 to 26 (5)
2 to 26 (6)
2 to 26 (6)
2 to 26 (7)
2 to 26 (7)
Possible OB num- Default system
bers response
100, ≥ 123 Ignore
1, ≥ 123 Ignore
10 to 17, ≥ 123 Not applicable
20 to 23, ≥ 123 Not applicable
30 to 38, ≥ 123 Not applicable
40 to 47, ≥ 123 Ignore
72 Ignore
80 Ignore
Depends on sys-
tem state
82 Ignore
83 Ignore
86 Ignore
121 STOP
122 Ignore
Basics of program execution
7.3 Events and OBs
Number of OBs
1)
0 to 100
0 to 100
0 to 20
0 to 20
0 to 20
0 to 50
0 or 1
0 or 1
2)
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
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