Siemens SIMATIC S7-1500 Automation System System Manual page 148

Basics of program processing
13.1 Events and OBs
The following table provides an overview of the OB start events, including the possible
values for OB priority, possible OB numbers, default system reaction and number of OBs.
The table is sorted in ascending order by OB numbers.
Types of event sources
Startup*
Cyclic program*
Time-of-day interrupt*
time-delay interrupt*
Cyclic interrupt*
Hardware interrupt*
Status interrupt
Update interrupt
Manufacturer-specific or
profile-specific interrupt
Isochronous mode interrupt
Time error
Maximum cycle time
exceeded once
Diagnostic error interrupt
Removal/insertion of
modules
Rack error
MC servo interrupt
MC interpolator interrupt
Programming error (only for
global error handling)
I/O access error (only for
global error handling)
* To these event sources, besides the permanently assigned OB numbers (see column: possible OB numbers), you can
also assign OB numbers from the range ≥ 123 via the TIA Portal.
148
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 24 (4)
2 to 24 (4)
2 to 24 (4)
16 to 26 (21)
22
2 to 26 (5)
2 to 26 (6)
2 to 26 (6)
17 to 26 (25)
16 to 26 (24)
2 to 26 (7)
2 to 26 (7)
Possible OB Default system
numbers reaction
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
61 to 64, ≥ 123 Ignore
80 Ignore
STOP
82 Ignore
83 Ignore
86 Ignore
91 not applicable
92 not applicable
121 STOP
122 Ignore
System Manual, 01/2013, A5E03461182-01
Number of OBs
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 to 2
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
S7-1500 Automation System