Baumer BMxx, GBxxx-GXxxx - EtherCAT / PoE from version ,5.0 - Manual (Page 19)

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30.09.14
5.5 Distributed Clocks Mode
Distributed clocks mode enables exactly the same time with all bus users.
The encoder can be utilized and configurated as reference clock for synchronisation purposes of both other
users and master. Thus a high-precision time base is available throughout the network.
The encoder generates process data synchronously to a Sync Signal.
The local cycle will be tripped once SYNC0/SYNC1 Event has been received. Prior to receiving the next
SYNC0/SYNC1 Event the process data frame must be completely processed by the slave.
5.5.1 Activation Distributed Clocks under TwinCAT
Important:
 Enable SYNC0 and SYNC1.
 Ever proceed any cycle time modification in the SYNC0 settings only.
 Do not alter any SYNC1 settings.