Page 104
Appendix | EtherCAT Documentation
optoNCDT 1900 / EtherCAT
A 5.8
Operational Modes
A 5.8.1
Free Run
There is no synchronization between sensor and EtherCAT master. The PDOs are updated based on the internal measuring rate. The
measuring rate is set using object 0x3200:003. PDO frames may be lost or duplicated. A gapless transmission of the PDO frames to
the EtherCAT master is only given if oversampling and measuring rate are in the right relation to the bus cycle, see Chap.
. You
can use the measured value counter in 0x6003 so that measured values are not evaluated twice due to the missing synchronization.
A 5.8.2
Distributed Clocks SYNC0 Synchronization
There is a synchronization between sensor and EtherCAT master via the Sync0 cycle time. An update of the PDOs is done based on
the Sync0 cycle time, which replaces the internal measuring rate. In this mode, an EtherCAT master can synchronize the measure-
ment 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 cycle, see Chap.
The ESI file contains predefined SYNC0 cycle times. But you can set any cycle time between 100000 ns (measuring rate=10.0 kHz)
and 4000000 ns (measuring rate=0.25 kHz).
A 5.8.3
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. A gapless
transmission of the PDO frames to the EtherCAT master is only given if oversampling and measuring rate are in the right relation to the
bus cycle, see Chap.
.
Summary of Contents for ILD1900-10
Page 8: ...optoNCDT 1900 EtherCAT ...
Page 110: ...Page 110 Appendix EtherCAT Documentation optoNCDT 1900 EtherCAT ...
Page 111: ......