EL2904 Beckhoff
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MPN: EL2904-0000
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The Beckhoff EL2904 is part of the EL EtherCAT Terminals series and features four outputs with 1-/2-wire connection technology. It is rated for a supply voltage of 24 V DC, maximum output current of 0.5 A, and offers an insulation voltage of 500 V DC. The EL2904 comes in a polycarbonate housing sized at 24 x 100 x 68 millimeters, supports the TwinSAFE protocol, and is protected to IP20.
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Product Description:
The EL2904 terminal is produced by Beckhoff as part of the EL EtherCAT Terminals series. It is a four-channel safety output module intended for integration in decentralized I/O stations where it switches 24 V DC loads on command from a safety controller. Within an automation line, the unit forms the interface between controller logic and field devices that require controlled power removal during emergency stops or diagnostics. This role makes it suitable for safety circuits that must shut off actuators or interposing devices in a monitored and repeatable way.
Each of the four solid-state channels operates from a control supply of 24 V DC. The permissible load range spans from 20 mA up to 0.5 A per channel, allowing the terminal to drive contactors, indicator lamps, or relays that fall into utilization category DC-13. Connection is handled through one- or two-wire spring clamps, so wiring for single or redundant loops is possible. With overvoltage category II isolation, the module keeps transient events on the load side from feeding back into the EtherCAT segment. The set of 4 outputs is continuously monitored for short circuits and cross-faults, which helps keep the commanded switching state clear in safety-related applications.
Mechanical and installation limits are addressed by a polycarbonate housing that measures 24 mm × 100 mm × 68 mm and is designed for horizontal mounting on a 35 mm DIN rail. The enclosure carries a protection rating of IP20, a protection class III designation, and withstands an insulation voltage of 500 V DC. Power is passed through internal contacts rated for 10 A, while logic and safety data are exchanged through the TwinSAFE/Safety over EtherCAT protocol for deterministic reaction times. Safety communication travels within the EtherCAT system, so the terminal can be integrated into machine I/O stations without a separate safety network. The compact width leaves neighboring terminals accessible, and the spring clamps remain reachable from the front when modules are daisy-chained.
Frequently Asked Questions about EL2904:
Q: How many outputs does the EL2904 terminal offer?
A: The EL2904 provides four independent outputs for flexible control in safety-related applications.
Q: What supply voltage is required for the EL2904 EtherCAT terminal?
A: This terminal operates using a supply voltage of 24 V DC for all connected loads.
Q: Which safety protocol is used by the EL2904 terminal?
A: The EL2904 supports TwinSAFE/Safety over EtherCAT protocol, enabling integrated safety communication within EtherCAT networks.
Q: What is the maximum output current per channel on the EL2904?
A: It can handle a maximum output current of 0.5 A per output channel, making it suitable for small actuators and signaling devices.
Q: What type of housing and protection rating does the EL2904 have?
A: The EL2904 is DIN rail mountable with a housing material made from polycarbonate and features an IP20 protection rating.
