BECKHOFF EL4028 EtherCAT Terminal

Description

The BECKHOFF EL4028 is an 8-channel analog output EtherCAT terminal designed to generate current signals within the 4 to 20 mA range with a 12-bit resolution. As part of the modular EL-series system, this terminal combines high channel density with a compact 12 mm housing width, enabling efficient space utilization in electrical control cabinets.

The EL4028 utilizes 1-wire connection technology for single-ended signals, connecting directly to field actuators, control valves, and analytical instruments. The terminal features electrical isolation between the internal E-bus circuitry and the field-side signal voltage to ensure signal integrity and protect sensitive processing components.

Equipped with Distributed Clocks (DC) support, the terminal enables precise synchronization with other EtherCAT devices, achieving synchronization accuracy of less than 1 microsecond. Additionally, an optional watchdog timer can be configured to drive the outputs to user-specific safe values using a custom ramp during communication interruptions.

Features

• Eight independent analog output channels in a 12 mm terminal housing.
• Standard 4 to 20 mA current loop output signal interface.
• 12-bit signal conversion resolution.
• 1-wire connection technology for simplified, single-ended wiring.
• Support for Distributed Clocks (DC) to ensure highly precise synchronization.
• Configurable watchdog safety function with user-defined ramp values.
• Electrical isolation of 500 V between the E-bus and the output signals.

Applications

• Control of analog current-loop actuators and proportional valves.
• Integration with variable speed drives and positioning systems.
• Process control instrumentation interface in automated machinery.
• Distributed analog output subsystems in EtherCAT network topologies.

Technical Specifications

General Specifications

Electrical and Signal Data

EtherCAT and Communication

Environmental and Wiring

Installation Guidelines

1. De-energize System: Ensure that the field power supply and the E-bus power supply are completely switched off before mounting, removing, or wiring the terminal.
2. Physical Mounting: Snap the terminal onto a standard 35 mm DIN rail (conforming to EN 60715). Ensure the double slot and key connections engage properly with neighboring terminals.
3. Secure Wiring: Strip conductors to a length of 8 to 9 mm. Actuate the integrated spring clamps using a standard flat-head screwdriver to insert solid, stranded, or ferruled conductors.
4. Supply Verification: Confirm that the 24 V DC supply is properly distributed through the power contacts. Ensure the total current through the power contacts does not exceed 10 A.
5. Initial Configuration: Power up the system and scan the node structure using TwinCAT System Manager to map the 8 x 16-bit analog output process image.

Compliance and Certifications

• CE
• UL
• ATEX: II 3 G Ex nA IIC T4 Gc