BECKHOFF EL3122 EtherCAT Terminal

Description

The BECKHOFF EL3122 is a 2-channel analog input EtherCAT Terminal designed for highly precise measurement of current signals in the 4 to 20 mA range. Both channels operate as differential inputs, providing a high-resolution 16-bit digital representation of the measured physical values. This terminal is integrated into the EtherCAT system via the standard E-bus connection, enabling fast communication and high-speed data acquisition.

To ensure optimal signal processing, the BECKHOFF EL3122 supports Distributed Clocks (DC) for highly synchronized sampling across the network. It features flexible configuration options, including activatable digital filters (FIR/IIR) to smooth input signals and eliminate high-frequency interference. Additionally, the terminal supports limit value monitoring and offers both standard and compact process images to optimize network bandwidth utilization.

Features

• Two differential analog input channels.
• Precise 16-bit resolution (including sign) for high-accuracy measurements.
• Standard 4 to 20 mA signal current range.
• Distributed Clocks (DC) support for microsecond-level synchronization.
• Configurable digital filters (FIR and IIR) and limit value monitoring.
• Compact 12 mm housing width with status indicator LEDs.
• Electrical isolation of 500 V between the E-bus and the signal path.

Applications

• High-speed industrial process monitoring and control.
• Precise current measurements from field transmitters, flow meters, and pressure sensors.
• Synchronized data acquisition in distributed control system topologies.
• Analog sensor integration in hazardous locations (Zone 2).

Technical Specifications

General

Electrical and Signal

Power Supply and Bus

Mechanical and Installation

Environmental and Certifications

Installation Guidelines

1. Ensure the system and all connected power supplies are de-energized before mounting, wiring, or removing any modules.
2. Mount the BECKHOFF EL3122 onto a 35 mm DIN rail (conforming to EN 60715). Align the terminal housing carefully with the neighboring modules using the double slot and key connection.
3. Ensure the terminal locks securely into place with a clear click to establish reliable E-bus electrical contact.
4. Strip the input signal conductors to a length of 8 to 9 mm. Insert the wire into the connection point by using a screwdriver to actuate the tension clamp.
5. Connect the differential current signals (4 to 20 mA) to the assigned terminals according to your system wiring diagram. Ensure proper polarity to avoid measurement errors.
6. For applications subject to electrical noise, use shielded cabling and terminate the shield correctly at the defined ground potential.
7. Re-energize the system and perform initial system configuration and diagnostic checks in the TwinCAT engineering environment.