Basics Of Program Execution; Events And Obs - Siemens SIMATIC S7-1500 System Manual
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Basics of program execution
7.1
Events and OBs
Response to triggers
The occurrence of a trigger results in the following reaction:
● 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.
● If the event comes from an event source to which you have not assigned an OB, the
default system reaction is executed.
Not e
Some event sources, such as startup, pull/plug, exist even if you do not configure them.
Triggers
The table below provides an overview of the triggers, including the possible values for OB
priority, possible OB numbers, default system reaction and number of OBs.
Table 7- 1
Triggers
Typ es of event sources
Startup
2)
Cyclic program
2)
Time-of-day interrupt
2)
Time-delay interrupt
2)
Cyclic interrupt
2)
Hardware interrupt
2)
Status interrupt
Update interrupt
Manufacturer-specific or
profile-specific interrupt
Isochronous mode interrupt
Time error
3)
Maximum cycle time exceed-
ed once
Diagnostics interrupt
Automation system
System Manual, 09/2016, A5E03461182-AD
Po ssible priorities (default
p riority)
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)
Po ssible OB num-
D e fault system
b e rs
re action
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
7
N umber 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 to 2
0 or 1
0 or 1
117
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