Events And Obs - Siemens SIMATIC S7-1500 System Manual

10.3

Events and OBs

Start events
The table below gives an overview of the possible event sources for start events and their
OBs:
Table 10- 3 Start events
Event sources
Startup
Cyclic program
Time-of-day interrupt
Time-delay interrupt
Cyclic interrupt
Hardware interrupt
Status interrupt
Update alarm
Manufacturer-specific or
profile-specific interrupt
I/O redundancy error
CPU redundancy error
Time error
Maximum cycle time exceed-
ed
Diagnostics interrupt
Removal/insertion of modules 2 to 26 (6)
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)
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
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 (16)
2 to 24 (4)
2 to 24 (4)
2 to 24 (4)
2 to 26 (6)
2 to 26 (26)
22
2 to 26 (5)
2 to 26 (6)
2 to 26 (7)
2 to 26 (7)
Possible OB Default system
numbers 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
55 Ignore
56 Ignore
57 Ignore
70 Ignore
72 Ignore
80 Ignore
Depends on sys-
tem state
82 Ignore
83 Ignore
86 Ignore
121 STOP
122 Ignore
Basics of program execution
10.3 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
0 or 1
0 or 1
0 or 1
0 or 1
2)
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
323