ELX3204-0090 Beckhoff
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The ELX3204-0090 is a terminal module manufactured by Beckhoff as part of the EL EtherCAT Terminals series. It features four RTD inputs with a resolution of 0.1 degrees Celsius per digit and supports sensors like Pt100, Pt200, and Ni1000. The device uses a 2-wire connection method, operates at 24 VDC Ex power contact voltage, and has IP20 protection.
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Product Description:
The ELX3204-0090 is a resistance temperature detector input terminal manufactured by Beckhoff for the EL EtherCAT Terminals series. Installed on an EtherCAT I/O node, it converts low-level sensor signals from hazardous-area circuits into digital temperature data for PLCs and industrial PCs. This compact device enables precise thermal feedback loops and temperature logging without requiring signal conditioners in the field. Its narrow terminal format also allows multiple sensor channels to be installed in a limited amount of control cabinet space.
The wiring side uses a two-wire connection method, so each channel measures the sensor with only two leads to simplify intrinsically safe installations. Measurement detail is provided by a resolution of 0.1 °C per digit, allowing the controller to react to small temperature changes. Internal electronics draw 5 V DC from the EtherCAT E-bus, while the separate power contact supplies 24 V DC Ex to energize the field loops within Ex i limits. An enclosure rating of IP20 restricts the terminal to enclosed control cabinets where it is protected from direct contact and external contamination. Each channel can source up to 12 mA through the field interface and has an open-circuit voltage of 4.94 V to meet intrinsic-safety parameters. Data integrity is monitored using a fixed CRC count of eight. The terminal contributes four 32-bit RTD words to the controller’s process image, providing a separate temperature value for every connected channel.
The module accepts four inputs that are preconfigured for Pt100 sensors but can also handle Pt200, Pt500, Pt1000, Ni100, Ni120, and Ni1000 elements. This range of supported sensor types allows the terminal to work with common platinum and nickel resistance temperature detectors. Per-channel power dissipation is limited to 15 mW, preserving intrinsic-safety margins in potentially explosive zones. TwinSAFE integration is available through four safety-related channels, and safe-cycle parameters are stored at index 8040 for deterministic retrieval during startup. The field-side electrical limits support the connection of suitable sensors installed in Zone 0 or Zone 20 circuits. Temperature values are transferred through EtherCAT during each scan, allowing the control system to monitor all connected channels without separate analog signal-conditioning modules.
