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EL2798 Beckhoff

MPN: EL2798-0000

The Beckhoff EL2798 module belongs to the EL EtherCAT Terminals series and features 8 make contact outputs with 2-wire connection technology. The terminal supports a nominal voltage range of 0 to 30 V AC/DC and a maximum output current of 2 A per channel with a total of 10 A. It conforms to EN 60068-2-6/EN 60068-2-27 standards.

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Internal Product Review

The EL2798 EtherCAT Terminal delivers reliable switching with eight potential-free outputs and a maximum output current of 2 A per channel. It offers fast switching times, high peak current capability, and robust electrical isolation. The terminal is an optimal choice for applications requiring certified safety and low on-resistance.

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Product Description:

The EL2798 is an EtherCAT Terminal that provides eight solid-state relay outputs for AC and DC voltages. Beckhoff manufactures the EL terminal uses high-performance MOSFET transistors that allow for reliable switching of both ohmic and slightly inductive loads. The terminal is housed in a polycarbonate enclosure and is intended for mounting on a 35 mm DIN rail.

The EL2798 EtherCAT terminal features eight potential-free make contacts that substitute traditional relay contacts and support switching up to 30 V AC/DC for ohmic and slightly inductive loads, and up to 48 V DC for purely ohmic loads. The maximum output current is 2 A per channel, with a total output current of 10 A. The on-resistance is typically 0.03 Ω, and the breakdown voltage is 80 V. The terminal is not short-circuit-proof but can handle peak currents up to 5 A for 100 ms, allowing it to manage high inrush currents until an external fuse responds. Electrical isolation of 500 V is provided between the E-bus and field potential, and channel-to-channel isolation is less than 200 V. The typical current consumption from the E-bus is 140 mA. The terminal operates in ambient temperatures from 0°C to +55°C and supports relative humidity up to 95% non-condensing.

The EL2798 EtherCAT terminal supports a stripping length of 8–9 mm and accommodates various conductor types, including solid and stranded wires as well as ferrules. The terminal is designed for flexible installation positions and features high-density housing with signal LEDs for status indication. The terminal is protected to IP20 and meets EMC immunity and emission standards EN 61000-6-2 and EN 61000-6-4. The installation is simplified by direct plug-in for solid conductors and spring actuation for stranded wires.

Approvals/markings
CE, UL, DNV GL
Breakdown Voltage
80 V
Connection Technology
2-wire
Current Consumption E-bus
typ. 140 mA
Housing Material
Polycarbonate
Max. Output Current
2 A per channel (∑ 10 A)
Mounting
35 mm DIN rail (EN 60715)
Nominal Voltage
0…30 V AC/DC (ohmic load only: 0…48 V DC)
Number Of Outputs
8 x make contacts
On-resistance
typ. 0.03 Ω
Operating Temperature
0…55°C
Peak Current
5 A (100 ms), < 50 A (10 ms)
Storage Temperature
-25…+85°C
Switching Times
T_ON: typ. 1.8 ms, T_OFF: typ. 30 ms
Vibration/shock Resistance
conforms to EN 60068-2-6/EN 60068-2-27

Frequently Asked Questions about EL2798:

Q: Why does EL2798 have 8 output channels?

A: The terminal offers eight output channels that allow flexible control of multiple loads in one compact terminal. This design increases system integration efficiency.

Q: Does EL2798 support both AC and DC switching?

A: Yes, the terminal supports switching of both AC and DC voltages up to 30 V, and up to 48 V DC for ohmic loads.

Q: Why is the EL2798 not short-circuit-proof?

A: The terminal uses MOSFETs that can handle high peak currents briefly but rely on external fuses for short-circuit protection. This approach maintains compactness and flexibility.

Q: How does EL2798 achieve electrical isolation?

A: The terminal provides 500 V isolation between the E-bus and field potential, and less than 200 V channel-to-channel, ensuring safe operation and signal integrity.

Q: Why is polycarbonate used for EL2798 housing?

A: Polycarbonate provides mechanical strength and electrical insulation for the terminal, ensuring durability and safety during operation and installation.

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