EL6688 EtherCAT® Terminal


In order to achieve optimum automation synchronization of large production lines and factories, Beckhoff Automation has released the new EL6688 EtherCAT® Terminal. The EL6688 terminal permits extremely precise cross-factory and cross-site synchronization according to the IEEE 1588 standard.

Using the EL6688, different machines, system components or production lines can be accurately synchronized with each other or with an external grandmaster clock via GPS or DCF77 receivers. In this way, a high-precision, technology- and vendor-independent global timebase is available that can be used for time-stamping of measured data, for example.

With the distributed clocks, all devices in an EtherCAT system can be synchronized with a tolerance of less than 100 ns. The EL6688 EtherCAT Terminal permits synchronization with different networks across sites. This applies to different production lines, for example, which have to be synchronized with microsecond precision.  The system utilizes the control accuracy of distributed clocks and the standardized synchronization interface in the EL6688. Synchronization to an external event is always the same, irrespective of whether the external application uses EtherCAT, IEEE 1588 or a digital input.
The EL6688 EtherCAT Terminal supports the Ethernet-based IEEE 1588 protocols PTPv1 (IEEE 1588-2002) and PTPv2 (IEEE 1588-2008).
The EL6688 is an IEEE 1588 clock (ordinary clock), which, from the perspective of the higher-level master (grandmaster), operates as a slave or supplies the connected EtherCAT Terminals (slaves) as a master via distributed clocks. The EL6688 terminal can be located at any point within an EtherCAT Terminal network.


• Number of Ethernet ports 1 • Bus system Ethernet (IEEE 802.3) • Ethernet interface 10BASE-T/100BASE-TX Ethernet with 1 x RJ 45 • Data transfer rates 10/100 Mbit/s, IEEE 802.3u auto-negotiation, half or full duplex at 10 and 100 Mbit/s possible, automatic settings • Cable length up to 100 m twisted pair • Hardware diagnosis status LEDs • Power supply via the E-bus • Electrical isolation 500 Vrms (E-bus/Ethernet) • Configuration no • Current consumption E-bus typ. 310 mA • Weight approx. 75 g • Operating/storage temperature 0…+55 °C/-25…+85 °C • Relative humidity 95 %, no condensation • Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27/29 • EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4 • Protect. class/installation pos. IP 20/variable
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