BECKHOFF EL4002 EL Series Analog Output Terminal

Product Overview

The EL4002 (EL4002) is a high-precision, 2-channel analog output terminal from the Beckhoff EL series, designed for industrial control applications requiring precise voltage signals. Operating within the 0 to 10 V range with 12-bit resolution, this terminal facilitates reliable communication between the EtherCAT network and peripheral actuators such as proportional valves, frequency converters, or heating control elements. With support for Distributed Clocks (DC) and a sub-microsecond precision, the EL4002 ensures deterministic control performance, which is vital for high-speed synchronization in multi-axis motion and complex process control systems, ultimately reducing signal latency and enhancing overall system stability.

Technical Configuration

The EL4002 utilizes a 2-wire, single-ended connection architecture, optimized for stable 0 to 10 V voltage output with a load capability exceeding 5 kOhm. The module is fully integrated into the EtherCAT E-bus, providing electrical isolation up to 500 V between the field potential and the internal communication bus. A standout feature of the EL4002 is its user-configurable watchdog and synchronization capabilities; these allow engineers to define safe-state output values during network interruptions, including ramp-based transitions to prevent sudden mechanical movements, thereby safeguarding equipment and personnel.

Technical Specifications

FAQs

How does the Distributed Clock (DC) feature benefit the application?

The Distributed Clock feature allows the terminal to synchronize its output conversion with the EtherCAT master's system time. With a precision of significantly less than 1 µs, it ensures that analog signals change exactly when required, eliminating timing jitter in the process.

What is the purpose of the watchdog feature in this terminal?

The watchdog is a safety function that monitors the EtherCAT communication link. If communication is lost, the terminal automatically switches the outputs to a pre-defined safe state, which can be configured as a fixed value or a ramped sequence to avoid dangerous machine behavior.

Can I use the EL4002 for inductive loads?

The terminal is designed for voltage output signals (0...10 V) with a load requirement > 5 kΩ. It is not intended to drive high-current inductive actuators directly. If driving such devices, ensure the input impedance of the secondary device meets the terminal's load requirements or use an intermediate signal converter.

Installation and Operational Recommendations

• Signal Integrity: Given the 12-bit resolution, maintain high signal integrity by using shielded, twisted-pair cabling for all analog output connections. Terminate the shield at the cabinet's grounding busbar to minimize noise pickup from surrounding power cables.
• Wiring Technique: Utilize the spring-actuation terminals with an appropriate screwdriver. When using flexible conductors, ferrules are highly recommended to prevent strand splaying, which can cause intermittent contact resistance and signal drift.
• Side-by-Side Mounting: The EL4002 supports side-by-side mounting using a double slot and key connection. When placing multiple analog modules together, be mindful of heat dissipation; although the current consumption is low (typ. 140 mA E-bus), maintaining a consistent operating environment ensures the long-term accuracy of the output stages.