EK1100-0008 BECKHOFF EtherCAT Coupler with M8 Connection

Product Overview

The EK1100-0008 (EK 1100-0008) is a specialized EtherCAT Coupler designed for high-vibration and space-constrained industrial environments where traditional RJ45 connections may be insufficient. It serves as the vital link between the 100BASE-TX EtherCAT network and the Beckhoff EtherCAT Terminals (ELxxxx series). By utilizing 2 x M8 shielded screw-type interfaces, the EK1100-0008 ensures a gas-tight, vibration-resistant physical connection, making it an ideal choice for mobile robotics, automotive production lines, and high-dynamic motion systems. The coupler converts the passing telegrams from Ethernet 100BASE-TX to the internal E-bus signal representation, supporting up to 65,534 terminals in a single segment while maintaining a minimal internal delay of approximately 1 microsecond.

Technical Configuration

The EK1100-0008 architecture is engineered for robust power distribution and signal integrity. It features a dual-power supply system: $U_S$ for the internal electronics and E-bus communication (providing up to 2000 mA), and $U_P$ for the field-side power contacts (supporting up to 24 VDC / 10 A). The M8 bus interfaces are fully shielded and conform to the 100 Mbit/s EtherCAT protocol, supporting distances of up to 100 meters between stations. The hardware includes integrated diagnostic LEDs for Link/Activity and power status, housed in a 44 mm polycarbonate enclosure. With 500 V electrical isolation between power contacts, supply voltage, and the Ethernet layer, it effectively isolates field-level noise from the control network.

Technical Specifications

Technical FAQs

What is the primary advantage of M8 connectors over RJ45 in EtherCAT systems?

The M8 screw-type connection on the EK1100-0008 provides superior mechanical stability and resistance to environmental ingress compared to RJ45. It is specifically designed to prevent accidental disconnection or signal flickering in applications subject to constant movement or high-frequency vibration.

How is the E-bus current consumption calculated for this coupler?

The current consumption from the $U_S$ control voltage is calculated as: $70\text{ mA} + (\sum\text{ E-bus current} / 4)$. If the total E-bus demand of your attached ELxxxx terminals exceeds the 2000 mA supply capacity of the coupler, an additional power feed terminal (such as the EL9410) must be integrated into the segment.

Does the EK1100-0008 support ATEX/IECEx hazardous areas?

Yes, the module carries the Ex marking II 3 G Ex nA IIC T4 Gc, making it suitable for Zone 2 hazardous areas. For such installations, the coupler must be mounted in an enclosure that meets the IP54 protection requirements as per the standard.

Engineering & Installation Guide

M8 Interface Torque and Shielding:

When installing the EtherCAT cables, the M8 connectors should be tightened to the manufacturer's specified torque (typically 0.4 Nm) to ensure a gas-tight seal and reliable shielding continuity. Use only shielded Cat.5 or higher cables with M8 4-pin D-coded connectors to maintain the 100BASE-TX signal integrity over the maximum 100 m distance.

Wiring and Power Distribution:

The EK1100-0008 provides two separate 24 VDC supply paths. Connect the $U_S$ (System) supply to pins 1 and 5, and the $U_P$ (Peripheral/Field) supply to pins 2 and 6. Use the spring-actuated terminals for wiring; solid or stranded wires between 0.08 and 2.5 mm² are supported. Ensure a stripping length of 8–9 mm to guarantee proper contact. If the field devices draw more than 10 A, you must use a new power feed terminal to prevent damage to the internal power contacts.

Installation Position and Thermal Management:

While the installation position is variable, horizontal mounting on a 35 mm DIN rail is recommended for optimal heat dissipation. Ensure the "double slot and key" connection is properly engaged with the adjacent terminal to maintain the integrity of the E-bus data contacts. In environments reaching the upper limit of 60 deg C, maintain at least 30 mm of vertical clearance for natural convection.