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AMT58x-PN ProfiNET®
11.4 OB61
WARNING
Use of OBs requires both in-depth skills and specific expertise in
SIMATIC
STEP
7
programming
environment.
For
detailed
information please consult the STEP 7 Programmer's handbook and
documentation.
Organization blocks (OBs) form the interface between the CPU
operating system and the user program.
The order in which the user program is executed is defined in the
organization blocks.
The synchronization with the user program is maintained through the
clocked interrupt OB61. OB61 is a synchronous cycle interrupt; in
other words it is an isochronous event that is called with the start of
every PROFINET cycle. It is synchronous with the Profinet send
clock.
Figure 47 - OB61
85
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