Analog input
EL3751
Run LED
OK/Error LED
+Input 1
+Input 2
-Input 1
-Input 2
+Uv
-Uv
Shield (FE)
Shield (FE)
Top view
Contact assembly
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:
voltage measurement: ±5 mꢀ to ±3ꢁ ꢀ (incl. ±1ꢁ ꢀ), ꢁ…10 V, ꢁ…5 V
current measurement: ±±ꢁ mA, 4…20 mA, ꢁ…20 mA, NAMUR NE43
resistance measurement: ꢁ…5 kΩ
electrical resistance R in ±-/3-/4-wire connection
RTD measurement in ±-/3-/4-wire connection
strain gauge/load cell: ¼ bridge (35ꢁ Ω + 1±ꢁ Ω), ½ bridge (±1ꢂ mꢀ/ꢀ) and full bridge (±3± mꢀ/ꢀ) with integrated supply in ±-/3-/4-/5-/ꢂ-wire
connection
potentiometer: min. 1 kΩ
The measuring ranges generally reach accuracy class ꢁ.ꢁ1 %. For further information please refer to the documentation. Through the feature
“ExtendedRange” the user has the full technical measuring range available, up to 1ꢁ7 % 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 EL3ꢁxx/EL31xx series.
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To suppress aliasing effects, the input channel features two configurable numeric software filters up to 39 order FIR/ꢂ 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 ±4 bit and 1ꢁ 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
Power supply
1
via the E-bus
Technology
differential input, ±-/3-/4-/5-/ꢂ-wire connection
Oversampling factor
Distributed clocks
Distributed clock precision
Internal resistance
Input filter limit frequency
Dielectric strength
Conversion time
n = 1…64
yes
<< 1 µs
> 5ꢁꢁ kΩ (3ꢁ ꢀ);> 4 MΩ (others); 15ꢁ Ω (current)
3 kHz
max. 3ꢂ ꢀ
1ꢁꢁ µs/1ꢁ ksps
Measuring range, nominal
±3ꢁ/1ꢁ/5/±.5/1.±5 ꢀ, ±ꢂ4ꢁ/3±ꢁ/1ꢂꢁ/ꢃꢁ/4ꢁ/±ꢁ/1ꢁ/5 mꢀ, ꢁ…5/10 V, 20 mA, ꢁ/4…20 mA, NAMUR NE43, ꢁ…5 kΩ, RTD,
PT1ꢁꢁ/PT1ꢁꢁꢁ, Ni, KTY, ¼ bridge (35ꢁ Ω + 1±ꢁ Ω), ½ bridge (±1ꢂ mꢀ/ꢀ), full bridge (±3± mꢀ/ꢀ), potentiometer ≥ 1 kΩ
Measuring range, technical
Resolution
generally 1ꢁ7 % of the nominal measuring range, see documentation
±4 bit (incl. sign)
Measuring error
typ. ±ꢁ.ꢁ1 % relative to the respective full scale value @ ±3 °C in some measuring ranges, see documentation
typ. < 15 ppm/K in some measuring ranges, see documentation
5ꢁꢁ ꢀ (E-bus/signal voltage)
Temperature coefficient
Electrical isolation
BECKHOFF New Automation Technology
We reserve the right to make technical changes.
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