Beckhoff EL3751 | EtherCAT Terminal, 1-channel analog input, multi-function

The EL3751 analog input terminal is part of the new generation of analog

EtherCAT measurement terminals. The nominal measuring range of the

input channel can be comprehensively parameterized, both electrically

and on the software side:

• 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)

and full bridge (±32 mV/V) with integrated supply in 2-/3-/4-/5-/6-wire

connection

• potentiometer: min. 1 kΩ

The measuring ranges generally reach accuracy class 0.01%. For further

information please refer to the documentation. Through the feature

“ExtendedRange” the user has the full technical measuring range available,

up to 107% of the specified nominal measuring range, depending on the

measuring range. This feature can be disabled, in order to ensure

compatibility with the “LegacyRange” of the EL30xx/EL31xx series.

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 described, so that a band stop or

a band pass can be realized. The measurement at the differential input

channel is digitized with a resolution of 24 bit and 10 ksps and is

transmitted to the higher-level automation device electrically isolated and

optionally with oversampling. The data rate can be internally reduced,

in which case the filters have to be adjusted accordingly.

Non-linear characteristic sensor curves can be corrected flexibly through

an integrated sampling points table. Simple mathematical operations are

also possible.

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.

The signal state of the EtherCAT Terminal is indicated by light emitting

diodes.

Each terminal has a unique ID number.

This terminal is also available as a variant with an individual calibration

certificate.