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EL3751-0020 | EtherCAT Terminal, 1-channel analog input, multi-function, 24 bit, 10 ksps, factory calibrated

EL3751-0020 | EtherCAT Terminal, 1-channel analog input, multi-function, 24 bit, 10 ksps, factory calibrated

EL3751-0020 | EtherCAT Terminal, 1-channel analog input, multi-function, 24 bit, 10 ksps, factory calibrated

Run LED
OK/Error LED
+Input 1
+Input 2
+Uv
Shield (FE)
-Input 1
-Input 2
-Uv
Shield (FE)
Top view 
Contact assembly 
EL3751-0020 | EtherCAT Terminal, 1-channel analog input, multi-function, 24 bit, 10 ksps, factory calibrated

EL3751-0020 | EtherCAT Terminal, 1-channel analog input, multi-function, 24 bit, 10 ksps, factory calibrated

EtherCAT oversampling: maximum sampling rates irrespective of the EtherCAT cycle time

Distributed Clocks: the integrated time management system in EtherCAT

For demanding applications: calibrated analog inputs

Measurement technology easily configured: Analog EtherCAT input terminals.

Measurement technology simply integrated: With the analog EtherCAT Terminals.

EtherCAT oversampling: maximum sampling rates irrespective of the EtherCAT cycle time

Distributed Clocks: the integrated time management system in EtherCAT

For demanding applications: calibrated analog inputs

Measurement technology easily configured: Analog EtherCAT input terminals.

Measurement technology simply integrated: With the analog EtherCAT Terminals.

The EL3751-0020 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.

The individual Beckhoff factory calibration certificate can be downloaded here for each device. Recalibration (ZS9001) is possible via Beckhoff Service.

Product status:

regular delivery

Product information

Technical dataEL3751-0020
Number of inputs1
Power supplyvia the E-bus
Technologydifferential input, 2-/3-/4-/5-/6-wire connection
Oversampling factorn = 1…64
Distributed clocksyes
Distributed clock precision<< 1 µs
Internal resistance> 500 kΩ (30 V); > 4 MΩ (others); 150 Ω (current)
Input filter limit frequency3 kHz
Dielectric strengthmax. 36 V
Conversion time100 µs/10 ksps
Resolution24 bit (incl. sign)
Measurement error/ uncertaintytyp. ±0.01% relative to the respective full scale value @ 23°C in some measuring ranges, see documentation
Calibration certificate (analog)factory calibrated
Electrical isolation500 V (E-bus/signal voltage)
Current consumption power contacts
Current consumption E-bustyp. 260 mA
Configurationno address or configuration setting
Special featuresintegr. power supply for strain gauge 0.5…5 V, parameterizable, ExtendedRange 107%, free numeric filter, TrueRMS, integrator/differentiator, non-linear scaling, PeakHold, with calibration certificate
Weightapprox. 65 g
Operating/storage temperature0…+55°C/-25…+85°C
Relative humidity95%, no condensation
Vibration/shock resistanceconforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emissionconforms to EN 61000-6-2/EN 61000-6-4
Protect. rating/installation pos.IP20/variable
Approvals/markingsCE, UL, ATEX, IECEx
Ex markingATEX:
II 3 G Ex ec IIC T4 Gc
IECEx:
Ex ec IIC T4 Gc
Housing dataEL-12-8pin
Design formcompact terminal housing with signal LEDs
Materialpolycarbonate
Dimensions (W x H x D)12 mm x 100 mm x 68 mm
Installationon 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means ofdouble slot and key connection
Markinglabeling of the BZxxx series
Wiringsolid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver
Connection cross-sections*: 0.08…2.5 mm²,
st*: 0.08…2.5 mm²,
f*: 0.14…1.5 mm²
Connection cross-section AWGs*: AWG28…14,
st*: AWG28…14,
f*: AWG26…16
Stripping length8…9 mm
Current load power contactsImax: 10 A

*s: solid wire; st: stranded wire; f: with ferrule

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