3.1.8.3.12 Distributed clocks (DC clocks)
3.1.8.3.12.1 Overview
Synchronization via distributed clocks allows to share the same system time between the master and all
slaves.
This feature allows to achieve high performance, especially with sharp tuning.
Without synchronization, unwanted vibration can occur when a slave’s internal clock isn’t synchronized with
the master time. Especially when several slaves try to perform complex motion synchronously, periodical
vibrations, audible noise and spikes in the torque signal can appear and the slaves may not execute the
motion fully synchronously.
This is most prevalent in cyclic modes, since in profile modes the slaves compute their trajectories themselves.
Important
For good performance, always enable the feature if possible. Ensure that your master supports it!
3.1.8.3.12.2 Distributed Clock configuration
SOMANET supports 2 DC modes:
Slave mode - Master device will be used as a reference clock. All the slaves in the chain will be adjusted
according to the master time.
Master mode - One EtherCAT device will be used as a reference clock. Typically, the reference clock is the
first slave with DC capability between master and all the slaves to be synchronized (DC slaves).
This feature has to be configured on the master side. We recommend user to use the Master mode as it has
better performance than the Slave mode.
Additionally, the synchronization options have to be configured:
SYNC 0 has to be enabled with recommended cycle time equal to the EtherCAT communication.
SYNC 0 Shift time is usually 0.
SYNC 1 is not supported yet and needs to be disabled.
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