Product Description:

The EL3204-0018 is an analog input EtherCAT terminal produced by Beckhoff within the EL EtherCAT Terminals series. This compact module conditions resistance temperature detector (RTD) signals so that a controller on the EtherCAT bus can monitor precise process temperatures. By converting sensor resistance into digitized temperature data, the terminal simplifies distributed I/O layouts in industrial automation systems that need accurate thermal feedback for closed-loop control, energy management, or equipment protection. Its function suits machines that rely on stable temperature acquisition from remote sensors without using separate signal converters at each measuring point.

The module provides four differential measurement channels, and each channel is digitized by a Delta-Sigma converter that improves noise suppression on low-level signals. Temperature is represented with a granularity of 0.1 °C per digit, allowing fine resolution in monitored values. All 4 inputs share a single-ended ground reference and use simple 2-wire wiring, which helps keep field cabling straightforward. A 32-bit data word per channel populates the process image, so the controller receives a 4 × 32-bit RTD input block during every EtherCAT cycle. Internal electronics draw logic power exclusively from the E-bus, eliminating separate supply lines and easing terminal grouping.

For cabinet installation, power conductors can pass up to 10 A through the rear power contacts, allowing the segment to feed downstream terminals without external junctions. The housing measures 12 mm in width and 68 mm in depth, stands 100 mm tall, and uses polycarbonate for a lightweight but durable enclosure that snaps onto a 35 mm DIN rail. An IP20 protection rating is suitable for clean control-cabinet interiors where dust and moisture are limited. Supported sensor elements include Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, and Ni1000 types, which gives the terminal flexibility across different temperature-sensing layouts.