CU8851-0000 Beckhoff
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The Beckhoff CU8851-0000 is part of the CU EtherCAT Junctions series and features a DIN rail mounting design with a plastic housing. It supports a USB 2.0 extended input interface through RJ45 and offers a maximum transfer rate of 480 Mbit/s. The device has diagnostic LEDs, a power supply of 24 V DC, and an IP20 protection rating.
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Product Description:
The CU8851-0000 is an EtherCAT junction and USB extension interface produced by Beckhoff within the CU EtherCAT Junctions series. In an automation cabinet, the device acts as a compact hub that lets a control PC route USB 2.0 data through a standard Ethernet cable while simultaneously distributing EtherCAT branches. By combining these functions, it reduces wiring complexity and allows field-level diagnostics to be returned to the controller through a single modular unit.
This junction draws its operating logic from a 24 V DC supply and clips directly to a DIN Rail, so it can be positioned beside I/O terminals without separate brackets. USB signaling is transferred at up to 480 Mbit/s, which matches the high-speed mode used by USB 2.0 and helps connected devices maintain full data throughput. The upstream USB Extended connection is presented on 1 x RJ45, so a single twisted-pair cable can be used instead of the usual short USB lead. That cable can reach a maximum of 50 m between the control cabinet and a remote device, so equipment on moving gantries can remain within the allowed distance without active repeaters.
The housing is intended for clean control cabinets where compact rail spacing is important. The enclosure carries an IP20 protection rating, indicating finger-safe access and suitability for dry, clean enclosures. Downstream communication follows the USB 2.0 standard, enabling direct connection of industrial memory sticks or service tools with no protocol conversion. Signal integrity over the extended span depends on a Cat.5 cable, which maintains the differential impedance required for reliable high-speed transmission. A housing width of 34 mm conserves rail space, while the 98 mm height and 77 mm depth leave sufficient clearance for ventilation and adjacent modules.
Frequently Asked Questions about CU8851-0000:
Q: What type of input cable does the CU8851-0000 support?
A: The CU8851-0000 uses Cat.5 cables for input connections.
Q: What is the maximum data transfer rate supported by the CU8851-0000?
A: This junction provides a maximum data transfer rate of 480 Mbit/s via USB 2.0.
Q: What power supply does the CU8851-0000 require?
A: The supported power supply for the CU8851-0000 is 24 V DC.
Q: Does the CU8851-0000 feature diagnostic LEDs?
A: Diagnostic LEDs are included on the CU8851-0000 for status indication.
Q: How is the CU8851-0000 typically mounted?
A: The CU8851-0000 is designed for DIN rail mounting within control cabinets.
