Beckhoff CX2100-0904: Power Supply and UPS Module for CX20xx Embedded PC Systems

Product Overview

The Beckhoff CX2100-0904 is a power supply and uninterruptible power supply module designed for the CX2000 series Embedded PC systems, including the CX2020 and CX203x models. This module supplies 24 V DC power to the CPU modules, system components, and extension modules within the CX20xx system assembly. It integrates capacitive UPS functionality that provides sufficient energy to complete critical operations and safely shut down the system in the event of a main power failure. The module is passively cooled with no moving parts, ensuring silent operation and high reliability in industrial environments. It connects to the right side of the CX20xx system, allowing expansion with additional I/O terminals through the K bus or E bus interface.

Key Features of Beckhoff CX2100-0904

The CX2100-0904 incorporates an integrated UPS capacitor with a stored energy capacity of 75 As, which allows the Embedded PC to perform an orderly shutdown and save persistent data when input power is lost. The module features an illuminated FSTN graphical display with 2 lines of 16 characters each, a selection switch, and an enter key, enabling operators to query internal status values, display custom parameters, and navigate on screen menus without requiring a connected HMI device. The power supply provides a maximum output power of 45 W to the system components and supplies up to 2 A of current to connected I/O terminals via the K bus or E bus interface.

Technical Specifications

• Manufacturer: Beckhoff Automation

• Part Number: CX2100-0904

• Product Type: Power supply and UPS module

• Compatible Systems: CX20xx series, CX203x series

• Input Voltage: 24 V DC (-15% / +20%)

• Maximum Output Power: 45 W

• Power Consumption (module itself): 3.5 W

• UPS Type: Capacitive integrated

• UPS Stored Energy: 75 As

• Display: FSTN, illuminated, 2 lines x 16 characters

• Diagnostic LEDs: 1 x PWR, 1 x I/O Run, 1 x I/O Err

• I/O Connection: K bus or E bus (automatic recognition)

• I/O Terminal Power Supply: Max. 2 A

• Process Data on K bus: Max. 2048 bytes input, 2048 bytes output

• Maximum Number of K bus Terminals: 64 (255 with extension)

• Maximum Number of E bus Terminals: Up to 65534

• Dielectric Strength: 500 V

• Connection Type: Spring loaded system

• Dimensions (W x H x D): 118 mm x 100 mm x 91 mm

• Weight: 1025 g

• Operating Temperature: -25 to +50 degrees Celsius

• Protection Class: IP20

• Approvals: CE, UL

Functional Description

The CX2100-0904 serves as both the primary power source for the CX20xx system and as the interface to the Beckhoff I/O terminal system. Power is supplied to the module via a spring loaded terminal block, and the module distributes the 24 V DC to the attached CPU and any expansion modules. The integrated capacitive UPS continuously monitors the input voltage and automatically engages when the supply voltage falls below the specified threshold. The stored energy of 75 As is sufficient to allow the CX20xx to execute its configured UPS response program, which typically includes saving variable data to non volatile memory, closing valve or actuator outputs, and performing a controlled software shutdown.

The FSTN display and control keys provide local operator access to system diagnostic information. Operators can view input voltage levels, UPS status, internal temperature readings, and error messages directly on the module. The display can also be configured to show custom status parameters defined in the TwinCAT control software. The automatic recognition feature of the I O bus interface determines whether connected I O terminals are K bus terminals (compatible with CX1000 and CX2000 series) or E bus terminals (EtherCAT capable), and configures the bus communication accordingly without manual intervention.

Applications

The CX2100-0904 is used in all CX20xx and CX203x Embedded PC installations where controlled shutdown capability is required to prevent data loss or equipment damage during power interruptions. Typical applications include machine control systems, test and measurement equipment, building automation controllers, and remote monitoring stations. The integrated UPS feature is particularly valuable for headless systems that operate without a separate UPS device, as it provides basic power loss protection without the cost and space requirements of an external UPS unit.