Beckhoff releases EL3751 multi-function measurement terminal

  • May 19, 2016
  • Beckhoff Automation
Beckhoff releases EL3751 multi-function measurement terminal
Beckhoff releases EL3751 multi-function measurement terminal

May 18, 2016 – Beckhoff presented the EL3751 EtherCAT Terminal, a high-precision I/O for measurement applications. At 10,000 samples per second, a measurement accuracy of ±0.01 % and 24 bit resolution, the EL3751 with eXtreme Fast Control technology (XFC) provides measurement technology as part of the standard I/O system. Added to this is stability, flexible filter configurations (e.g. band stop), and parameterization options for the analog input, which supports the measurement functions U, I, R, DMS (strain gauge) and RTD.

Reliable acquisition of measurement data offers the potential to optimize machine efficiency and production quality. This can also be achieved for measurement technology tasks with the system-integrated EL3751 solution, which combines automation and measurement technology on one universal hardware and software platform. The EL3751 1-channel EtherCAT Terminal for analog measurement technology combines measurement accuracy: ±0.01 % of the full scale value for most interfaces, at 25 °C (±5 °C), with a sampling rate of up to 10,000 samples per second and 24 bit resolution (incl. sign).

Other important factors include hardware stability through pre-aging, as well as configuration options for the nominal measuring range of the input channel. The XFC technology (eXtreme Fast Control) functions are likewise available in the EL3751. Optionally, the measured data can be transmitted to higher-level automation devices with oversampling. The integrated distributed clocks ensure synchronized sampling across the EtherCAT system.

The "Extended Range" feature in the EL3751 enables effective measurement even beyond the nominal measuring range, with possible extension up to 107 percent. To suppress aliasing effects, the input channel features two configurable numeric software filters up to 39th order FIR / 6th order IIR. The filters can be preselected or freely defined, so that a band stop or a band pass can be implemented.

Each EL3751 has a unique serial number and is available with a factory calibration certificate on request. The integrated supply and the switchable auxiliary resistors enable direct connection of: a resistor bridge (strain gauge) or a load cell, a fixed ohmic resistor, a PTC or a potentiometer. Since the input channel can be parameterized comprehensively, both electrically and on the software side, the measurement terminal can be used universally:

  • Voltage measurement (±5 mV to ±30 V [incl. ±10 V], 0…10 V, 0…5 V)
  • Current measurement (±20 mA, 4…20 mA, 0…20 mA, Namur NE43)
  • Resistance measurement (0…5 kΩ)
  • Electrical resistance R in 2-/3-/4-wire connection
  • RTD measurement in 2-/3-/4-wire connection
  • Strain gauge/load cell: ¼ bridge (350 Ω + 120 Ω), ½ bridge (±16 mV/V), full bridge (±32 mV/V)
  • Potentiometer (from 1 kΩ)

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