EP2624-0002 BECKHOFF EtherCAT Box 4-channel Relay Output

Product Overview

The EP2624-0002 (EP2624-0002) is a ruggedized 4-channel relay output module from the Beckhoff EtherCAT Box series, specifically engineered for decentralized automation in harsh industrial environments. This module features four potential-free make contacts (Form A), allowing for the independent switching of various load types, including ohmic, inductive, and lamp loads. Housed in a compact, IP67-rated enclosure, the EP2624-0002 eliminates the need for a protective control cabinet, enabling direct machine mounting even in areas subject to moisture, dust, and vibration. With specialized ATEX certification (II 3 G Ex nA IIC T4 Gc), it is an ideal solution for hazardous zones in chemical processing, oil and gas, and pharmaceutical manufacturing where safe, potential-free switching of small signals or auxiliary power is a mechanical necessity.

Technical Configuration

The EP2624-0002 architecture is designed for versatile signal handling and high mechanical durability. It features two shielded M8 sockets for EtherCAT communication and M12 (5-pin, A-coded) connectors for output signals. The potential-free "make contacts" support switching currents up to 0.5 A AC or 2 A DC per channel, with an exceptionally low minimum permitted load of 10 µA at 10 mV DC, making it suitable for low-level signal switching. The module consumes 200 mA from the US control voltage and provides 500 V electrical isolation between the outputs and the internal logic. Its mechanical lifespan is rated at a minimum of 100 million cycles, ensuring long-term reliability in high-cycle packaging or material handling applications.

Technical Specifications

Technical FAQs

What is the benefit of the "Potential-free switching" feature?

Potential-free (or dry) contacts mean the outputs are electrically isolated from the module's power supply and from each other. This allows you to switch different voltage levels or separate power circuits (e.g., 24 VDC and 25 VAC) through the same module without risk of cross-talk or short circuits between channels.

Can the EP2624-0002 be used in explosive atmospheres?

Yes, this variant is ATEX certified for Zone 2 applications (II 3 G Ex nA IIC T4 Gc). However, ensure that the installation complies with all local ATEX regulations and that the M12/M8 connectors are properly tightened and secured to maintain the required protection standards.

What is the "minimum permitted load" and why does it matter?

The minimum load is 10 µA at 10 mV DC. This low threshold indicates that the relay contacts are designed to maintain reliable contact resistance even when switching very small currents, which is vital for interfacing with high-impedance electronic inputs or sensitive sensors.

Engineering & Installation Guide

M12 Connector Pinout and Sealing:

To maintain the IP67 protection rating, use only pre-assembled, industrial-grade M12 A-coded cables. Ensure the M12 screw connections are hand-tightened to a firm stop. Unused output ports must be sealed with professional-grade protective caps. Any moisture ingress into an unused port will compromise the 500 V electrical isolation and can cause intermittent faults in the potential-free contacts.

Inductive Load Protection:

When switching inductive loads (such as small solenoid valves or contactor coils), it is a recommended engineering practice to install an external flyback diode (for DC) or an RC snubber (for AC) across the load. This prevents the back-EMF spikes from causing arcing across the relay contacts, significantly extending the electrical life of the module beyond the minimum 200,000 cycles.

Power Supply Cascading:

The EP2624-0002 features an M8 male input and an M8 female downstream connection for power. This allows you to "daisy-chain" the supply voltage across multiple EtherCAT boxes. Ensure that the total current consumption of all modules in the chain does not exceed the 4 A rating of the M8 power connectors to prevent localized overheating and voltage drops at the end of the line.