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Appendix |EtherCAT Documentation
confocalDT 24x1
A 6.5
Distributed Clock
A 6.5.1 Introduction
The synchronization of IFC24x1 among each other in the EtherCAT is realized via the
Distributed Clock.
With it it is not necessary or possible to transmit the synchro-
nous signals via the synchronous input or output of the controller.
Unlike the Ethernet the synchronization does not occur via external signals but about
the clocks in the controllers. Using the EtherCAT this results in the synchronous modes
Synchronization out
(= Free Run) and
Slave.
The minimum cycle time for distributed clock is 100 µs for the IFC2451, 40 µs for the
IFC2461 and 14.3 µs for the IFC2471.
A 6.5.2 Synchronization
IFC24x1, that support the synchronization in the EtherCAT mode, offer the additional tab
DC
in the TwinCat-Manager. In addition to the
FreeRun
mode (not synchronized), the
controller can be operated synchronously with different frequencies.
A 6.5.3 Synchronization off
In the
FreeRun
mode no synchronization of controllers occurs.
A 6.5.4 Slave
In the
DC_Synchron xxxkHz
mode the controller is switched in the synchronization
mode Slave.
Besides
xxx
means the measuring rate. The controller measures with the rate selected by
xxx
.
A 6.5.5 Apply Selected Settings
Once the required synchronization mode is selected using the drop-down-menu, it is ap-
plied with F4.
A 6.5.6 Setting Regardless of TwinCat
The setting of the synchronisation mode in EtherCAT occurs via the setting of the registers
for the Distributed Clocks. You will find details under www.beckhoff.de or www.ethercat.
org.
For reading the settings in the TwinCAT it is possible to display the requirements of the
XML file using the button
Advanced Settings
.