EK1521 Beckhoff
Wake Industrial LLC is not an authorized distributor of this product.
The Beckhoff EK1521 is part of the EK EtherCAT Couplers series and uses an SC Duplex connector type. This coupler supports multimode glass fiber and features a transceiver wavelength of 1310 nm. It offers a minimum output power of -23.5 dBm for 50/125 µm fiber and has an optical input sensitivity of -31 dBm.
Internal Product Review
The EK1521 is a Beckhoff EtherCAT coupler designed for fiber-based network extension with an SC Duplex connector and multimode glass fiber support. Distributed Clocks capability and a 1310 nm transceiver support precise synchronization and stable optical communication in demanding control architectures. A 7.5 dBm optical power budget stands out as a strong specification for dependable industrial links.
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Product Description:
The EK1521 is an EtherCAT fiber-optic coupler produced by Beckhoff within the EK EtherCAT Couplers series. It terminates an EtherCAT strand and regenerates telegrams so that local I/O nodes can be attached on its E-bus side. By converting communication to optical signals, the unit provides long-distance links that resist electromagnetic interference between controllers and remote terminal strings in industrial automation. The device also forms a bridge between copper segments and glass-fiber media without changing the real-time behavior of the fieldbus. This arrangement is useful in installations where electrical isolation or extended communication distances are required between machine sections.
The optical interface uses an SC duplex connector, a common format that allows secure cable connections in control cabinets. Data travels over multimode glass fiber (MM), which is suitable for communication across typical factory backbones. The transceiver operates at 1310 nm, a wavelength that balances dispersion and transmission loss in multimode infrastructure. An optical link margin of 7.5 dBm accommodates losses introduced by cables, connections, and normal signal attenuation. The receiver remains functional with an input level as low as -31 dBm, allowing communication to continue when the incoming optical signal is weak. The coupler also supports distributed clocks, enabling precise time synchronization among downstream I/O modules for coordinated measurement and control tasks.
The internal code uses revision 03, while the distributed-clock functionality uses DC revision 0018. These revision levels support synchronized timing and frame forwarding without requiring additional optical conversion equipment. On the transmit side, the module provides a minimum optical output of -23.5 dBm with 50/125 µm fiber. When connected to cable with 62.5/125 µm cores, the minimum optical output increases to -20 dBm. These output levels account for the different coupling characteristics of the supported core sizes and help maintain stable communication across the permitted cable route. Distributed-clock support allows downstream terminals to coordinate events with very small timing differences, which is important for applications involving synchronized acquisition, motion, or process control.
