BECKHOFF EK1521 EK Series Fiber-Optic Junction

Product Overview

The EK1521 (EK1521) is a high-performance 1-port EtherCAT junction specifically designed for the extension of EtherCAT networks via multi-mode glass fiber. By converting the standard copper-based E-bus to a fiber-optic medium, this device enables reliable data transmission across distances of up to 2,000 meters. This makes the EK1521 an essential component in large-scale industrial plants, distributed energy systems, and expansive infrastructure where long-range communication or immunity to electromagnetic interference (EMI) is required. The junction maintains seamless real-time performance with a minimal delay of approximately 1 µs, ensuring that deterministic control is preserved across the fiber-optic segment.

Technical Configuration

The EK1521 is optimized for the 100BASE-FX standard, utilizing SC Duplex connectors for robust fiber-optic interfacing. It is powered directly via the E-bus, eliminating the need for separate 24 V DC supply wiring and simplifying the integration into existing Beckhoff terminal nodes. Because it acts as a transparent coupling junction, it requires no physical address or software configuration—it functions immediately upon connection within the EtherCAT topology. Its compact housing is designed for side-by-side DIN rail mounting, maintaining the modularity consistent with the Beckhoff I/O system.

Technical Specifications

FAQs

Why use fiber-optic glass fiber instead of standard copper Ethernet?

Fiber-optic cabling provides total immunity to electromagnetic interference (EMI) and radio frequency interference (RFI). Additionally, it allows for significantly longer transmission distances (up to 2 km) compared to the 100 m limit of standard copper-based 100BASE-TX Ethernet.

Does the EK1521 require a separate 24 V DC power supply?

No, the EK1521 draws its power directly from the E-bus, which simplifies cabinet wiring and reduces the space required for additional power supply modules.

Is this device compatible with hazardous environments?

Yes, the EK1521 is ATEX-approved (II 3 G Ex nA IIC T4 Gc), meaning it is suitable for use in Zone 2 hazardous areas, provided it is installed within an appropriate housing.

Engineering Guidelines and Best Practices

• Fiber Handling: When working with multi-mode glass fiber, avoid sharp bends that exceed the manufacturer’s recommended bend radius. Use high-quality SC Duplex patch cables and clean the connectors with an industry-standard fiber cleaner prior to insertion to prevent signal attenuation caused by dust or oils.
• Network Topology: The EK1521 is a transparent junction. When designing your EtherCAT topology, treat the fiber-optic segment as an extension of your primary bus. Ensure the total number of devices and the cumulative propagation delay in your network remain within the operational limits of your EtherCAT master.
• Vibration and Mounting: Although the device is designed to conform to strict vibration and shock standards, ensure that the DIN rail is securely mounted and that the fiber-optic cables are properly strain-relieved. Excessive tension on the fiber connectors can lead to misalignment and intermittent link drops.