EL1889 Beckhoff
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MPN: EL1889-0000
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The Beckhoff EL1889 is an input terminal from the EL EtherCAT Terminals series and features 16 inputs with a nominal input voltage of 24 VDC. It uses ground switching logic and 1-wire connection technology, and is designed for mounting on a 35 mm rail. The terminal has an input filter of 3 ms and an IP20 protection class.
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Product Description:
The EL1889 is a digital input terminal produced by Beckhoff for the EL EtherCAT Terminals series. As part of this modular I/O platform, the unit acquires discrete sensor signals and transfers them directly to the EtherCAT process image, allowing a PLC to read machine status without additional gateway hardware. Its compact, rail-mounted housing is suitable for dense control cabinets where numerous field contacts must be collected within the EtherCAT cycle. The terminal integrates with adjacent EtherCAT devices through the internal bus, enabling input data to be exchanged with the controller during cyclic operation.
This terminal uses 1-wire connection technology, so every channel shares a common voltage reference and requires less wiring in multi-sensor assemblies. The internal E-bus draws 110 mA, while each input draws only 3 mA from the supply. A digital filter of 3 ms suppresses contact bounce, ensuring stable state evaluation before each input bit is transferred. The channels operate at a nominal 24 VDC, which matches the standard control voltage used by industrial machinery. Ground-switching logic connects the low side of each sensor to the bus ground, while the input reference comes from the power contact carried through the terminal. The module clips onto a 35 mm DIN rail and passes the power contacts continuously to adjacent terminals.
The terminal provides 16 electrically isolated input channels, and the corresponding process-image width gives the controller a contiguous word for reading their states. This arrangement allows several discrete signals to be monitored through a single compact EtherCAT slice without separate interface modules. The power-contact path carries up to 35 mA for the terminal’s circuitry and remains connected to the next terminal in the assembly. The enclosure has an IP20 protection rating, providing finger-safe protection for installation inside a control cabinet. Despite its high channel density, the housing is only 12 mm wide, conserving DIN-rail space when large banks of digital inputs are installed. Its narrow profile also leaves more room for other I/O terminals, power distribution components, and wiring ducts within the enclosure.
