Notes on commissioning EL6685-00x0
Notice | |
Basic information on distributed clocks (DC) The EL6685-00x0 is an EtherCAT slave for time synchronization. Please regard the explanations in the EtherCAT system documentation from chapter "EtherCAT synchronization". |
The EL6685-00x0 serves as a reference clock in the EtherCAT network and should be used physically as the first device in the EtherCAT Terminal network (closest possible position to the EtherCAT master). The EL6685 is automatically selected as the EtherCAT master for the reference clock. This increases the time accuracy, as the first terminal in the network is best suited as a reference.
When operating on an IPC, an EK1100 Coupler is required, which is typically the first distributed clock device. The DC capability of the coupler must be disabled manually so that the EtherCAT master as the first DC device selects the EL6685-00x0 as the reference clock.
The specifications of the EL6685-00x0 are shown below:
Specification | EL6685 | Unit | Conditions | |
|---|---|---|---|---|
Oscillator basic accuracy*) | ±5000 | ±275 | ppb | includes frequency characteristics such as initial tolerance, frequency/temperature, frequency/load, frequency/voltage characteristics and ageing (constant temperature, 20 years) |
1-day stability (max.) | ±50 | ±0.5 | ppb | Operating temperature 25 °C, 1 day, after 48 hours of continuous operation |
1-day stability (typ.) | ±10 | ±0.2 | ppb | Operating temperature 25 °C, 1 day, after 30 days of continuous operation |
1-year stability*) | ±600 | ±100 | ppb | The aging resistance is assessed on the basis of reliability tests under environmental conditions and the expected frequency fluctuations over time. |
Temperature deviation | ±130 | ±0.4 | ppb/°C | Over the operating temperature range (max. 1 K/minute) |
*) This does not constitute a guarantee of performance over the entire product life cycle.