EL1104 Beckhoff
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MPN: EL1104-0000
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The Beckhoff EL1104 is an EtherCAT Terminal with four digital inputs and a protection class of IP20. As part of the EL EtherCAT Terminals series, it operates with a power voltage of 24 V DC and features an isolation voltage of 500 V. The unit has an input current of 3 mA and uses an input filter of 3 ms, conforming to the EN 61131-2 Type 3 signal standard.
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Product Description:
The EL1104 is a digital input terminal engineered by Beckhoff within the EL EtherCAT Terminals series. Serving as an interface between field wiring and the EtherCAT bus, the unit receives discrete control signals from sensors, limit switches, or operator stations and forwards them to the PLC for processing. Its compact housing and inline I/O format allow reliable signal acquisition directly on a DIN rail without external breakout modules. The terminal does not support distributed clocks, so applications requiring precise synchronization must obtain timing information from other compatible network nodes.
Each channel draws an input current of 3 mA, which keeps the connected sensor load low and limits heat generation in densely packed control cabinets. A built-in input filter of 3 ms rejects contact bounce and brief electrical glitches, allowing stable logic levels to reach the controller. Electrical separation is provided by an isolation barrier rated at 500 V, which helps prevent field-side faults from reaching the communication electronics. The hardware provides four independent input circuits for monitoring separate field devices. These circuits operate with a supply voltage of 24 V DC, allowing direct connection to compatible industrial proximity switches and other discrete signaling devices without intermediate relays.
The terminal maps incoming channel states into the process image, where the controller evaluates them during each EtherCAT communication cycle. The housing has an IP20 protection rating, so the terminal must be installed in a closed control cabinet that prevents accidental contact with live parts and shields it from unsuitable debris. All input circuits share a reference potential of 0 V, simplifying common-ground wiring for connected sensor groups. Signal conditioning complies with EN 61131-2 Type 3, supporting compatible industrial sensors that meet the associated switching thresholds. Status information is transferred through the terminal bus contacts, while field conductors connect at the front of the module for accessible routing within the cabinet. This arrangement keeps field wiring separate from EtherCAT communication and supports orderly installation alongside other inline I/O terminals.
Frequently Asked Questions about EL1104:
Q: What is the power voltage required for the EL1104 terminal?
A: The EL1104 operates at a power voltage of 24 V DC.
Q: How many input channels does the Beckhoff EL1104 offer?
A: This terminal provides four digital input channels.
Q: What signal standard does the EL1104 terminal support?
A: The EL1104 meets the EN 61131-2 Type 3 signal standard.
Q: What is the isolation voltage provided by the EL1104 from Beckhoff?
A: It features 500 V isolation voltage for secure operation.
Q: What protection class does the Beckhoff EL1104 terminal have?
A: The EL1104 is classified as IP20 for protection.
