Distributed Clocks Sync0 Synchronization; Sm2/Sm3 Synchronization - MICRO-EPSILON IF2035-EtherCAT Manual

5.7.2

Distributed clocks SYNC0 synchronization

Sensor and EtherCAT master are synchronized via the Sync0 cycle time. The PDOs are updated based on the internal
Sync0 cycle time, which replaces the internal cycle time. In this mode, an EtherCAT master can synchronize the meas­
urement acquisition for the EtherCAT cycle time and the measurement acquisition of multiple controllers.
Note that although the measurements in the sensor are synchronized to the Sync0 cycle time, the transmission of the
values to the EtherCAT master is again asynchronous with the bus cycle. Synchronous transmission of the values to the
EtherCAT master is only given if oversampling and Sync0 cycle time are in the right relation to the bus
5.6.
The ESI file contains predefined SYNC0 cycle times. However, you can set any cycle time between >= 250000 ns (meas­
uring rate= 4 kHz), e.g. a cycle time of 10000000 ns (measuring rate=100 Hz). The cycle time should match the measur­
ing rate set in the sensor and the selected oversampling factor.
5.7.3

SM2/SM3 Synchronization

The sensor supplies current data to the EtherCAT master with every SM2 or SM3 event. Please note that the data of the
PDOs are updated with the internal measuring rate independent of the bus cycle. This can cause PDO frames to be lost
or duplicated.
IF2035-EtherCAT
Initial operation
cycle, see Chap.
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