EK1122-0008 BECKHOFF 2-Port EtherCAT Junction M8 Connection

Product Overview

The EK1122-0008 (EK 1122-0008) is a specialized 2-port EtherCAT junction terminal engineered for rugged industrial environments where mechanical stability and vibration resistance are paramount. Designed to facilitate the branching of EtherCAT topologies, this module replaces standard RJ45 ports with two M8 shielded, screw-type interfaces. In high-dynamic applications such as robotic arms, mobile assembly platforms, and wind turbine pitch control, the EK1122-0008 ensures a gas-tight, secure physical connection. By enabling the creation of star or tree topologies within an EtherCAT segment, it allows for decentralized station coupling with a minimal internal delay of approximately 1 microsecond, maintaining the deterministic performance of the 100 Mbit/s network.

Technical Configuration

The EK1122-0008 serves as a transparent junction within the EtherCAT system, requiring no manual software configuration or addressing. It utilizes the E-bus for its internal power supply, consuming typically 220 mA. The module is capable of driving 100BASE-TX signals over distances of up to 100 meters using shielded Cat.5 (or higher) cabling. Its architecture is specifically hardened for extreme conditions, featuring vibration and shock resistance according to EN 60068 standards. Furthermore, it carries extensive hazardous area certifications, including ATEX (Ex nA) and cFMus (Class I, Division 2), permitting deployment in explosive atmospheres where Zone 2 or Division 2 safety protocols are required.

Technical Specifications

Technical FAQs

Why would I choose M8 connections over standard RJ45 for a junction?

The M8 screw-type connection on the EK1122-0008 provides significantly higher mechanical security. Unlike RJ45 clips which can snap or vibrate loose, the M8 threaded coupling ensures the shield and data pins remain in constant contact even under high-frequency vibration or repetitive movement.

Does the EK1122-0008 require its own IP address?

No. As an EtherCAT junction, the EK1122-0008 is transparent to the network. The EtherCAT master automatically manages the data flow through the junction to any downstream devices without the need for manual configuration or IP assignment.

Can this junction be used to power downstream terminals?

The EK1122-0008 draws its own power from the E-bus to drive the 2-port switch logic, but it is primarily a data coupling device. Ensure that your EtherCAT coupler (e.g., EK1100) has sufficient E-bus power capacity to support the 220 mA consumption of this junction plus all other attached ELxxxx terminals.

Engineering & Installation Guide

M8 Connector Assembly and Shielding:

To maintain the required EMC immunity (conforming to EN 61000-6-2/4), use only shielded M8 4-pin D-coded cables. Tighten the M8 screw-type connectors to the manufacturer’s recommended torque to ensure the shield makes a 360-degree connection with the terminal housing. This is critical in preventing data packet loss in high-interference environments typical of motor control centers.

Hazardous Area (Ex) Installation:

For ATEX and cFMus Class I, Div 2 installations, the EK1122-0008 must be installed in a tool-secured enclosure that provides at least IP54 protection. Ensure that the M8 cables are also rated for the environment and that the 35 mm DIN rail is connected to a clean functional earth. Under no circumstances should the M8 connectors be disconnected while the circuit is live in a hazardous atmosphere.

Topology Planning and Delay:

With a minimal internal delay of 1 microsecond, the EK1122-0008 allows for deep nesting of EtherCAT branches without significantly impacting the cycle time. When planning the network, keep in mind that the 100-meter distance limit applies to each segment (from the junction to the next station). Use the double slot and key connection to firmly mount the junction alongside other EtherCAT terminals to ensure E-bus continuity.