Beckhoff EL3783 Documentation page 137

Fig. 175: Setting of the oversampling rates via System Manager, "DC" tab
Distributed Clocks not activated
• the EL3783 operates according to an internal clock, which is synchronized to the EtherCAT cycle time.
The trigger point in this case is the access to the input Sync Manager SM3.
• As a result the EL3783 can compensate fluctuations in the cycle time to a large extent
• The EL3783 can thus be used in systems that have no Distributed Clocks functionality. The time
accuracy of the measured values is reduced, however.
The EtherCAT cycle time must be selected such that
• it is not less than 200 µs (see table in chapter "Quickstart")
• the oversampling interval does not produce a non-periodic time value – for example, 33.3 µs is not
allowed for the oversampling cycle
The Distributed Clock is to be deactivated in the DC tab
Fig. 176: Deactivation of the Distributed Clock in the "DC" tab
The permissible oversampling rates are then set via the System Manager:
Fig. 177: EL3783 Selection dialog "Predefined PDO Assignment"
EL3783 Version: 1.1
Commissioning
137