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.
EL3218
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