Article image EL3702-0015

Beckhoff EL3702-0015

EL3702-0015 | 2-channel analog input terminal -150…+150 mV with oversampling

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Description

The EL3702-0015 analog input terminal handles signals in the range between -150 and +150 mV and is thus ideally suited for the measurement of shunts and Rogowski coils with built-in integrator. The voltage is digitised to a resolution of 16 bits, and is transmitted, electrically isolated, to the controller. The signals are oversampled with an adjustable, integer multiple (oversampling factor: n) of the bus cycle time (n microcycles per bus cycle). For each microcycle, the EtherCAT Terminal generates a process data block that is transferred collectively during the next bus cycle. The time base of the terminal can be synchronised precisely with other EtherCAT devices via distributed clocks. This procedure enables the temporal resolution of the analog input signals to be increased to n times the bus cycle time. In conjunction with the EL47xx (analog output terminal with oversampling), responses with equidistant time intervals, e.g. in the event of a threshold value being exceeded, become possible. The distributed clocks function enables several EL3702-0015 devices to be synchronised in almost any configuration. The maximum sampling rate per channel is 100 ksamples/s (100,000 samples/s).

Technical parameters

Number of inputs: 2 (differential)
Power supply: via the E-bus
Technology: differential input, oversampling
Signal voltage: -150…+150 mV
Max. sampling rate: max. 10 µs/100 ksps (per channel, simultaneously)
Oversampling factor: n = 1…100 selectable (max. 100 ksamples/s)
Input signal bandwidth: 0…30 kHz recommended
Distributed clocks: yes
Distributed clock precision: << 1 µs
Internal resistance: > 200 kΩ
Input filter limit frequency: 80 kHz
Common-mode voltage UCM: max. 35 V
Conversion time: ~ 10 µs per sample
Resolution: 16 bit (incl. sign)
Measuring error: < ±0.3 % up to 10 Hz (relative to full scale value)
Electrical isolation: 500 V (E-bus/signal voltage)
Current consumption power contacts:
Current consumption E-bus: typ. 200 mA
Bit width in the process image: input: n x 2 x 16 bit data; optionally 2 x 16 bit cycle counter, 4 byte StartNextLatch time
Special features: oversampling
Weight: approx. 60 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/markings: CE

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