Beckhoff CX5020-0111 CX5020 CPU Base Unit Embedded PC

The CX5020-0111 base unit runs the 32-bit Windows Embedded Standard 2009 operating system paired with the licensed TwinCAT 2 PLC runtime software. Engineering, logic design, and configuration are performed using TwinCAT 2 PLC software (version 2.11 or later) or a TwinCAT 3 runtime (version 3.1 32-bit target). System software, runtime environment files, and control projects reside directly on an industrial CompactFlash Type I/II card.

During normal execution, the integrated 1-second capacitive UPS guards against persistent data corruption when main power fails. Upon loss of the 24 V DC supply, the UPS delivers internal power for one second, allowing TwinCAT to write retained persistent data onto the CompactFlash card before shutdown. Inserting a fully configured CompactFlash card into a replacement base unit restores the operating environment and project parameters, provided IP configurations and runtime licensing match system requirements.

Network integration is handled by two independent Gigabit Ethernet ports (10/100/1000 Mbit/s) with RJ45 connectors. This dual-port architecture enables structural separation between fieldbus communication traffic and upper-level plant networks or programming PCs. Local control interfaces and peripherals connect directly via four USB 2.0 host ports and a female DVI-D port suited for local operator panels.

The unit features a right-hand bus interface that accepts direct side-by-side connection of Beckhoff E-bus EtherCAT Terminals (ELxxxx series) or standard K-bus Bus Terminals (KLxxxx series). The system automatically identifies connected terminal types without requiring additional line drivers or interface modules. A factory option slot is also available for extending fieldbus connectivity to PROFIBUS, CANopen, or PROFINET networks.

Hardware status monitoring is accessible directly via five front-panel diagnostic LEDs. The PWR LED confirms 24 V DC input status, while the multi-color TC LED indicates the current TwinCAT state, showing green for RUN mode, blue for CONFIG mode, and red for STOP mode or fault conditions. Read and write access to system memory flashes the yellow HDD/Flash LED, while separate green L/A1 and L/A2 LEDs indicate link and activity states on each Ethernet port.

Software-level diagnostics can be carried out remotely across the network. Technicians can start a Remote Desktop Connection (RDP) to access the underlying Windows Embedded desktop, run TwinCAT ADS queries from an engineering workstation, or inspect individual E-bus and K-bus terminal states directly using TwinCAT System Manager software.

Status LED Indicators

When replacing an existing CX5020-0111 unit, verifying the base model reference and internal configuration is critical for application compatibility. Maintenance teams should ensure that the CompactFlash card installed in the replacement unit matches the required operating system build, TwinCAT version, and control program.

Prior to restarting the system, ensure the 24 V DC supply is wired with correct polarity and that attached E-bus or K-bus terminals are mechanically aligned and locked. Because the integrated capacitive UPS depends on a functional power supply to remain charged, verifying power stability during commissioning prevents unexpected loss of persistent data during routine power cycling.