Beckhoff EL3218 | EtherCAT Terminal, 8-channel analog input

EL3218 | EtherCAT Terminal, 8-channel analog input, temperature, RTD (Pt100), 16 bit, 3-wire connection

The EL3218 analog input terminal facilitates the direct connection of eight resistance sensors using 3-wire technology over a width of 24 mm (high-density housing).

The measured resistance value can either be output directly in ohms or transformed into a temperature.

If the temperature at the measuring point is of interest, the conversion from resistance to temperature can be carried out in the terminal according to various sensor characteristics (Pt100. Pt1000. NI120. NI1000. KTY types, etc.).

The EL3218 can operate sensors using 2-wire and 3-wire technology.

The EtherCAT Terminals indicate their measurement capability by means of light emitting diodes and status bits in the EtherCAT process image

Technical data    EL3218

Number of inputs    8

Power supply    via the E-bus

Distributed clocks    –

Input filter limit frequency    typ. 1 kHz

Sensor types    Pt100. Pt200. Pt500. Pt1000. Ni100. Ni120.

Ni1000. resistance measurement (e.g. potentiometer, 10 Ω…4 kΩ), KTY sensors (types see documentation)

Connection technology    2- or 3-wire (default: 3-wire)

Conversion time    approx. 170 ms default setting

Measuring range    -200…+850°C (Pt sensors); -60…+250°C (Ni sensors)

Measuring current    < 0.5 mA (load-dependent)

Temperature range    -200…+850°C (Pt sensors); -60…+250°C (Ni sensors)

Resolution    0.1°C or 0.01°C per digit

Measurement error/uncertainty    < ±0.5°C for Pt sensors, 8 x 3-wire connection

Electrical isolation    500 V (E-bus/signal voltage)

Current consumption E-bus    typ. 120 mA

Current consumption power contacts    –

Special features    integrated digital filter, limit value monitoring, variable connection technology

Weight    approx. 60 g

Operating temperature    -25…+60°C

Storage temperature    -40…+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. rating/installation pos.    IP20/variable

Approvals/markings    CE, UL

Technical data

Housing data

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Housing data    EL-24-2x16pin

Design form    HD (High Density) housing with signal LEDs

Material    polycarbonate

Installation    on 35 mm DIN rail, conforming to EN 60715 with lock

Side by side mounting by means of    double slot and key connection

Marking    labeling of the BZxxxx series

Wiring    solid conductors (s): direct plug-in technique; fine-stranded conductors (st) and ferrule (f): spring actuation by screwdriver

Connection cross-section    s*: 0.08…1.5 mm²,

st*: 0.25…1.5 mm²,

f*: 0.14…0.75 mm²

Connection cross-section AWG    s*: AWG28…16.

st*: AWG22…16.

f*: AWG26…19

Stripping length    8…9 mm

Current load power contacts    Imax: 10 A

Dimensions (W x H x D)    24 mm x 100 mm x 68 mm