EL1804 Beckhoff
Wake Industrial LLC is not an authorized distributor of this product.
MPN: EL1804-0000
The Beckhoff EL1804 is part of the EL EtherCAT Terminals series and offers 4 inputs with a nominal input voltage of 24 VDC. This terminal features 3-wire connection technology, housing connection points for 16 wires, and an input filter of 3 ms. It comes with IP20 protection class and a terminal block width of 12 mm.
Internal Product Review
The Beckhoff EL1804 is a well-executed EtherCAT input terminal with 4 inputs and 24 VDC nominal input voltage. A 3 ms input filter and EN 61131-2 Type 1/3 signal standard support clean response and reliable control integration.
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Product Description:
The EL1804 is a digital input terminal produced by Beckhoff and supplied under the EL EtherCAT Terminals series. Installed on an EtherCAT I/O station, it accepts 24 V DC binary signals from sensors or switches and places them directly into the controller’s process image, allowing deterministic acquisition of machine states in industrial automation. The terminal operates on a nominal supply of 24 V DC, so standard control-cabinet power can be routed to its inputs without level shifting.
An input filter of 3 ms suppresses contact bounce and brief noise pulses before a state change is forwarded, improving signal stability. The internal circuitry complies with the EN 61131-2 Type 1/3 standard, indicating compatibility with sourcing or sinking field devices intended for PLC systems. Once sampled, each channel contributes one bit, giving a total process image width of 4 input bits that the EtherCAT master reads during every cycle. Despite handling four channels, the housing is only 12 mm wide, conserving DIN-rail space in densely populated cabinets. Four green input LEDs on the faceplate provide individual channel diagnostics, while solid, stranded, and ferrule-equipped conductors can all be attached to the spring terminals.
Sixteen internal routing points distribute field and supply lines inside the housing; these 16 routing points use a 3-wire connection scheme that brings the signal line and a shared reference to each device. The module clips onto a 35 mm mounting rail and can be oriented in any installation position without derating. The enclosure has an IP20 ingress protection rating, so the terminal must be installed inside an enclosed panel. The four digital inputs use the 0 V power contact as their common reference ground. The power contacts pass through to the next terminal, allowing the supply to be daisy-chained along the EtherCAT station without separate wiring for each module.
