Sync Task

The cycle time of the PROFINET communication is specified by the controller. The task on the TwinCAT system must work at at least the same speed. The basic PROFINET clock and the SendClockFactor result in the shortest cycle time of 1 ms. Further reductions take place using the ReductionRatioFactor. This always corresponds to a multiple of the minimum PROFINET clock. This results in a PROFINET cycle time that is always a power of two (1, 2, 4, 8..., 512), i.e. the task should also trigger in this grid.

Sync Task 1:

Standard (via Mapping)

The device is triggered by the existing mapping. This can then be, for example, the task of the PLC or the NC

Sync Task 2:

Recommended cycle time

With Profinet RTC1, cycle times of 1 ms or higher are possible. The task can always be operated with 1 ms, as long as the system load of your systems permits this.

Special Sync Task

Note

Use a dedicated Sync Task

Use your own sync task (Special Sync Task), or a free-running task, because mapping via the PLC leads, for example at a breakpoint, to the task being stopped and thus the connection to the PROFINET Device being interrupted and no process data being exchanged.

Name

Name of the sync task

Cycle ticks

Sets the sync time of the sync task in ticks (depending on the default TwinCAT base time).

Priority

Sets the priority of the sync task. If a new task is created with the Create new I/O Task button, it is assigned the highest possible priority by default.

Note

Using the EL6631-0010

If the EtherCAT-PROFINET gateway terminal is used, it is important to note that the process data always arrives one cycle late in the PLC, as it requires a cycle to transfer the process data from PROFINET to EtherCAT