S7-1500 Automation System
System Manual, 01/2013, A5E03461182-01
147
Basics of program processing
13
13.1 Events and OBs
OB start events
The occurrence of an OB start event 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. This means that the event is positioned in a
queue that corresponds 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.
Note
Some event sources, such as startup, pull/plug, exist even if you do not configure them.
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