Beckhoff CX-B930 Series, Руководство пользователя

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CXxxxx-M930/B930 17 Version: 1.1
4.2.2 Sync Task
The PROFINET controller protocol must always be linked with a task. The set cycle time is also used for
processing the protocol. In theory, the controller can also be processed via a PLC or NC task. However, if a
PLC project, for example, is stopped (e.g. by restart or debugging), this results in the PROFINET part also
being stopped. In order to avoid such a side effect is it advisable to always create a free-running SyncTask.
1
3
2
No. Description
1 This option is enabled by default. In this case the Sync task is triggered via
the variable mapping. If several tasks are linked to the PROFINET adapter,
the task with the higher priority is always used as the Sync task.
Pay attention to the Sync task. The Sync task must correspond to the value
x
2
, i.e. 1 ms, 2 ms, 4 ms, 8 ms, 16 ms etc. The Sync task of the PROFINET
controller must not be set under the Sync task of a PROFINET device.
Example: If the PROFINET device operates with a 4 ms Sync task, the
Sync task of the PROFINET controller may be set to 4 ms, 8 ms, 16 ms,
etc. In this case cycle times of 1 ms or 2 ms may not be used.
2 If the Sync task is set via the mapping, note that a breakpoint results in
interruption of the task, which also affects the PROFINET communication.
You can override this behavior by using the Special Sync Task option. The
PROFINET device then uses a Sync task that runs independent of the PLC
task.
3 At this point the name, cycle time and priority for the cycle time can be set.