Beckhoff ELM3344-0000 | EtherCAT Terminal, 4-channel analog input, temperature

The ELM3244-0000 and ELM3246-0000 measure resistances very

precisely in multiple measuring ranges up to 5 kΩ and are thus

suitable e.g. for critical temperature measurements with high

requirements. They can output the resistance value directly or

transform it locally, depending on the set RTD characteristic (e.g.

Pt100/Pt1000), into a temperature that is accurate to < ±0.05°C,

depending on the type.

The Beckhoff RTD measurement capability thus ranges from the

simple EL320x through the precise EL320x 0010 up to the ELM324x.

With a sampling rate of 1 ksps, they are part of the economy line

and are suitable for observing comparatively slow processes that

nevertheless need to be tracked very precisely.

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 2-, 4-, 6- or 8-channel ELM314x EtherCAT Terminals in the Economy

line can be set to current or voltage measurement channel by channel,

offering sampling rates of up to 1 ksps per channel.

Analog signals in the ranges from ±1.25 to ±10 V, 0 to 10 V, ±20 mA

or 0/4 to 20 mA can be processed. The settings for U or I measurement

mode and the desired measuring ranges can be selected via the control

system and TwinCAT in the CoE interface. Here it is also possible to

select the extensive diagnostics features for unattended long-term use.

The 2-, 4- or 6-pin push-in connectors can be removed for maintenance

purposes; they enable a direct supply of connected sensors.

The power contacts on the side simplify the potential distribution directly

on the DIN rail. The typical EtherCAT features are available: distributed

clocks functionality with timestamp and the familiar data features of the

basic line such as filtering, true RMS calculation and more.

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 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 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.