Beckhoff EL3204 EtherCAT Terminal

The Beckhoff EL3204 is a 4-channel analog input EtherCAT Terminal designed for direct connection of RTD temperature sensors such as Pt100, Pt1000, Ni100, Ni120, and KTY types. It converts measured resistance into temperature values using integrated characteristics, offering a high-resolution 0.1°C per digit. Supporting 2-wire sensor connections and featuring integrated digital filtering and limit monitoring, the EL3204 is ideal for precise temperature measurement across industrial automation environments.

Technical Specifications

Manufacturer: Beckhoff
Part Number: EL3204 Beckhoff
Product Type: Analog Input Terminal – RTD Temperature
Number of Inputs: 4
Sensor Types: Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni1000, KTY, Potentiometer
Temperature Range:
– Pt sensors: -200…+850°C
– Ni sensors: -60…+250°C
Resolution: 0.1°C per digit
Measurement Error: < ±0.5°C (Pt sensors)
Connection Method: 2-wire
Bit Width in Process Image: 4 x 32 bit RTD input
Special Features: Integrated digital filter, limit value monitoring

Electrical & Power

Power Supply: Via E-bus
Current Consumption (E-bus): Typ. 190 mA
Measuring Current: < 0.5 mA (load dependent)
Electrical Isolation: 500 V (E-bus / signal voltage)
Input Filter Limit Frequency: Typ. 1 kHz
Conversion Time: 85 ms (default); configurable 2…800 ms
Distributed Clocks: Not supported

Mechanical Specifications

Dimensions (W x H x D): 12 mm x 100 mm x 68 mm
Housing Type: EL-12-8pin / ES-12-8pin
Material: Polycarbonate
Installation: 35 mm DIN rail (EN 60715)
Wiring Method:
– Solid: 0.08…2.5 mm²
– Flexible: 0.08…2.5 mm²
– Ferrule: 0.14…1.5 mm²
AWG Range: AWG28…14 (solid/flexible), AWG26…16 (ferrule)
Stripping Length: 8…9 mm / 9…10 mm
Max. Power Contact Load: 10 A
Side-by-Side Mounting: Double slot and key connection

Environmental Conditions

Operating Temperature: -25°C to +60°C
Storage Temperature: -40°C to +85°C
Relative Humidity: 95% (non-condensing)
Vibration/Shock Resistance: EN 60068-2-6 / EN 60068-2-27
EMC Compliance: EN 61000-6-2 / EN 61000-6-4
IP Rating: IP20

Certifications & Compliance

Approvals: CE, CCC, UL, ATEX, IECEx, cFMus
ATEX Marking: II 3 G Ex ec IIC T4 Gc
IECEx Marking: Ex ec IIC T4 Gc
cFMus Marking:
– Class I, Division 2, Groups A, B, C, D
– Class I, Zone 2, AEx ec IIC T4 Gc

Key Features

✅ 4-Channel RTD Input: Compatible with Pt, Ni, and KTY sensors.

✅ High Accuracy: ±0.5°C error for Pt100 temperature sensing.

✅ Integrated Filter: Digital signal processing and limit monitoring.

✅ Compact Design: DIN rail-mountable, 12 mm width.

✅ Electrically Isolated: 500 V isolation from E-bus to signal level.

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Engineered for precision and compatibility, this module is the go-to choice for RTD-based temperature input in EtherCAT systems.

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