1-channel multi-functional input for analog measurement technology, 24 bit, 10 ksps EL3751
OK/Error LED
Run LED 
+Input 1
+Input 2
+Uv
Shield (FE)
-Input 1
-Input 2
-Uv
Shield (FE)
Top view 
Contact assembly 
XFC – eXtreme Fast Control

EL3751 | 1-channel multi-functional input for analog measurement technology, 24 bit, 10 ksps

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 parameterised, both electrically and on the software side:

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 realised. The measurement at the differential input channel is digitised 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.

Technical data EL3751
Number of inputs 1
Power supply via the E-bus
Technology differential input, 2-/3-/4-/5-/6-wire connection
Oversampling factor n = 1…64
Distributed clocks yes
Distributed clock precision << 1 µs
Internal resistance > 500 kΩ (30 V); > 4 MΩ (others); 150 Ω (current)
Input filter limit frequency 3 kHz
Dielectric strength max. 36 V
Conversion time 100 µs/10 ksps
Measuring range, nominal ±30/10/5/2.5/1.25 V, ±640/320/160/80/40/20/10/5 mV, 0…5/10 V, ±20 mA, 0/4…20 mA, NAMUR NE43, 0…5 kΩ, RTD, PT100/PT1000, Ni, KTY, ¼ bridge (350 Ω + 120 Ω), ½ bridge (±16 mV/V), full bridge (±32 mV/V), potentiometer ≥ 1 kΩ
Measuring range, technical generally 107 % of the nominal measuring range, see documentation
Resolution 24 bit (incl. sign)
Measuring error typ. ±0.01 % relative to the respective full scale value @ 23 °C in some measuring ranges, see documentation
Temperature coefficient typ. < 15 ppm/K in some measuring ranges, see documentation
Electrical isolation 500 V (E-bus/signal voltage)
Current consumption power contacts
Current consumption E-bus typ. 260 mA
Configuration no address or configuration setting
Special features integr. power supply for strain gauge 0.5…5 V, parameterisable, ExtendedRange 107 %, free numeric filter, TrueRMS, integrator/differentiator, non-linear scaling, PeakHold
Weight approx. 65 g
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Approvals CE, UL, Ex
Related products  
EL3751-0020 1-channel analog input, high-precision, parameterisable, 24 bit, 10 kSps, differential, oversampling, with calibration certificate
ELM3702-0000 2-channel multi-functional input, 24 bit, 10 ksps, push-in, service plug, 6-pin
ELM3704-0000 4-channel multi-functional input, 24 bit, 10 ksps, push-in, service plug, 6-pin
ELM3704-0001 4-channel multi-functional input, 24 bit, 10 ksps, LEMO 1B, 8-pin