Beckhoff ELM3504-0030 | EtherCAT Terminal, 4-channel analog input, measuring bridge

The ELM350x EtherCAT Terminals are designed for the evaluation of measuring

bridges in full-bridge, half-bridge and quarter bridge configuration.

The terminals feature internally switchable supplementary resistors. The feed

is integrated. Like all other parameters, the supply voltage is adjustable in the

CoE. Irrespective of the signal configuration, all ELM modules have the same

technological properties. The ELM350x modules for the evaluation of measuring

bridges offer a maximum sampling rate of 10.000 or 20.000 samples per second.

The 6-pin plug (push-in) can be removed for maintenance purposes without

releasing the individual wires.

This terminal is also available as a variant with an individual calibration certificate.

(See related products)

Extensive documentation is available from Beckhoff sales, support or

measurement@beckhoff.com.

This ELM3xxx series measurement terminal enables efficient implementation of

complex system-integrated data acquisition systems (DAQ) that place high

demands on measurement accuracy and time synchronization.

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 EL3453 EtherCAT power measurement terminal has voltage

inputs for direct monitoring of high-capacity generators up to max.

690 V AC, as is common in the wind industry, for example.

No upstream voltage transformer is required. The four current

inputs are electrically isolated so that the terminal can be used

in all common grounded current transformer configurations such

as 2- or 3-transformer configurations with star or delta connectionz

incl. neutral conductor current measurement.

The EL3453 can be used for simple grid analysis up to the 63rd

harmonics analysis.

Alternatively, all readings can be combined in a power quality factor

for simplified diagnostics. Like all measured terminal data, the

harmonic content can be read via the process data.

The EL3453 offers the “ExtendedRange” feature enabling the use

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

specified nominal measuring range.

In addition, the EL3453 comes with the option of transmitting the

times of the last voltage and current zero crossing to the controller

via XFC technology. This can be used, for example, to carry out

switching operations to suit the application.

The EL3483 EtherCAT Terminal enables the monitoring of relevant electrical

data of the supply network. The voltage is measured internally via direct

connection of L1. L2. L3 and N. The internal measured values are compared

with threshold values preset by the user. The result is available as digital

information in the process image. The EL3483 checks for the correct phase

order L1. L2. L3. phase failure, undervoltage and overvoltage, and possible

phase asymmetry. An error bit is set in the case of an incorrect phase order

or the failure of a phase. Should, for example, an asymmetry or voltage error

occur, only a warning bit is set initially. In addition, an internally calculated

mains quality factor provides information about the quality of the monitored

voltage supply. The EL3483 offers basic functionality for mains monitoring

and analysis.