The EtherCAT distributed clocks method is used as the basis for the highly precise acquisition of measured values in the EtherCAT Terminal system. These distributed clocks synchronize the EtherCAT devices with very high precision, independently of the PLC cycle. The EL3773 EtherCAT Terminal measures voltage and current via three channels in each case. The six channels are measured simultaneously based on the EtherCAT oversampling principle with a temporal resolution of up to 100 µs and passed on to the controller. The maximum sampling frequency for each channel is 10 kHz.
On the basis of the data supplied, it is possible with the aid of a PC to calculate true RMS values, power, power factors and frequency, and complex user-specific algorithms via the voltage and current curves. The fast sampling rate also enables the measurement of voltage and current peaks. Using the EL3773 power monitoring terminal, interference can be detected and corrected promptly in order to avoid damage to devices, increased electricity costs and downtime and to optimally boost the productivity of manufacturing facilities.