The EL3783 EtherCAT Terminal is a power monitoring I/O terminal

 used for state monitoring of a 3-phase AC voltage system.

For each phase, voltage up to 400/690 Vrms and current up to 1

Arms/5 Arms are sampled as instantaneous values with a resolution

of 16 bits. The six channels are measured simultaneously based on

the EtherCAT oversampling principle with a temporal resolution of

up to 50 µs and then passed on to the control system.

With the processing power available there and in combination with

the TwinCAT Function TF3650. true RMS or power calculations as

well as complex user-specific algorithms can be calculated via the

voltage and current characteristics. Through the oversampling

principle, the terminal is able to measure at significantly shorter 

intervals than the cycle time of the control system.

AC and DC parameters must be connected and measured with a

common reference potential.

Through the feature “ExtendedRange”, the user has the full technical

measuring range available at up to 130% of the specified nominal

measuring range. The EL3783 supports distributed clocks and can

therefore measure synchronously with other EtherCAT devices.

In combination with EL6688 it can be synchronized via IEEE 1588 to

external clocks. The terminal can also be operated without distributed

clocks.

The EL3773 and EL3783 power monitoring terminals are designed

for state monitoring of 3-phase AC voltage systems. For each phase

voltages and currents are sampled as instantaneous values with a

resolution of 16 bits:

• for the EL3773 up to 288 Vrms/410 V DC and up to 1 Arms/1.5 A

DC

• for the EL3783 up to 400/690 V AC and up to 5 A AC, each with

“ExtendedRange”

The six channels are measured simultaneously based on the EtherCAT 

oversampling principle with a temporal resolution of up to  100 μs

(EL3773) or up to 50 μs (EL3783) and passed on to the control system.

With the processing power available there and in combination with the

TwinCAT Function TF3650. true RMS or power calculations as well as

complex user-specific algorithms can be calculated via the voltage and

current characteristics. Through the oversampling, the terminal is able

to measure at significantly shorter intervals than the cycle time of the

control system. AC and DC parameters must be connected and measured

with a common reference potential. Both of the terminals support

distributed clocks and can therefore measure synchronously with other

EtherCAT devices. However, they can also be operated without distributed

clocks.

The EL3783 offers the “ExtendedRange” feature enabling the use of the

full technical measuring range, which equals 130% of the specified nominal

measuring range.

The EL3751-0024 analog input terminal is a variant of the EL3751-0000

multi-functional terminal that has been reduced to resistance or

temperature measurement (RTD). It measures to 5 kΩ full scale value in

2-/3-/4-wire connection. RTD temperature sensors (Pt100/1000. NI, KTY

etc.) can also be connected.

The EL3751-0024 is particularly suitable for fast and highly accurate

temperature measurements with a 10 ksps sampling rate. Even demanding

temperature measurements are possible with the two freely adjustable

numerical filters up to max. 39th order FIR/6th order IIR and the freely

adjustable scaler with support point table. The signal state of the EtherCAT

Terminal is indicated by LEDs.

Each terminal has a unique ID number.

The individual Beckhoff factory calibration certificate can be downloaded

via Beckhoff Service.

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.

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.

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 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.

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 EL3742 analog input terminal handles signals in the

range between 0 and 20 mA. The voltage is digitized to

a resolution of 16 bits, and is transmitted, electrically

isolated, to the controller. The input channels of the

EtherCAT Terminal have differential inputs and possess

a common, internal ground potential.

The signals are oversampled with an adjustable, integer

multiple (oversampling factor: n) of the bus cycle frequency

(n microcycles per bus cycle). For each bus cycle, the

EtherCAT Terminal generates a process data block that

is collected and transferred during the next bus cycle.

The time base of the terminal can be synchronized

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 EL3742

devices to be synchronized in almost any configuration.

The maximum sampling rate per channel is 100 ksamples/s

(100.000 samples/s).

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 digitized 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 synchronized

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 synchronized in almost any configuration.

The maximum sampling rate per channel is 100 ksamples/s (100.000

samples/s).