ELX3204 Beckhoff
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MPN: ELX3204-0000
The Beckhoff ELX3204 is a part of the EL EtherCAT Terminals series. It features four differential analog RTD inputs with 16-bit resolution, a 270 ms default conversion time, and 0.1°C temperature resolution. The terminal operates with a 24 VDC power contact supply, has an isolation voltage rating of 1500 V, and meets IP20 protection class standards.
Internal Product Review
The ELX3204 is a Beckhoff EtherCAT terminal for RTD measurement with 4 differential analog inputs and 16-bit resolution. Signal quality is excellent in distributed I/O applications, with 1500 V isolation voltage and 0.1°C/digit temperature resolution supporting dependable thermal data acquisition. A strong choice for precise temperature monitoring in industrial control systems.
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Product Description:
The ELX3204 is an analog input terminal produced by Beckhoff as part of the EL EtherCAT Terminals series. Designed for temperature acquisition, the unit accepts resistance temperature detector (RTD) signals and forwards the digitized data directly to an EtherCAT network. This terminal installs on a DIN rail next to other EL I/O slices and uses the series’ internal E-bus to share power and communication, allowing distributed temperature monitoring without additional gateways.
The terminal provides four differential input channels, so four separate RTDs can be connected while each sensor pair remains electrically isolated from the others. Each channel is sampled at a native resolution of 16 bits, providing fine granularity for detecting small temperature changes. A default conversion time of 270 ms balances the update rate with noise suppression, and the selectable digital filter limits bandwidth to 1 kHz to reject high-frequency interference common on long cable runs. The inputs are galvanically separated from the logic side by an isolation barrier rated at 1500 V, which protects the controller and adjoining modules from field-side transients. All wiring follows a two-wire method, reducing installation complexity when the RTD does not require lead-resistance compensation.
The module draws 70 mA from the internal bus, which supplies 5 VDC to the EtherCAT electronics, while the field layer receives an external process voltage of 24 VDC through the power contacts. Housing dimensions of 15 mm × 100 mm × 70 mm keep the panel depth shallow and allow a high channel density. Temperature values are transferred to the PLC as a process image consisting of four 32-bit words, and each raw count corresponds to 0.1 °C per digit for straightforward scaling. The enclosure meets an ingress protection rating of IP20, so it must be mounted inside a cabinet but does not require additional sealing under normal indoor conditions.
