# Beckhoff CX8090

Hardware · `CX8090` · verification: source checked

The Beckhoff CX8090 is a control system with an Arm9 processor running Windows Embedded CE 6 and TwinCAT 2 PLC. It connects to K-bus or E-bus I/O terminals, which it detects automatically at startup, and supports Modbus TCP plus Ethernet and TCP/IP communication. It is programmed with TwinCAT through a fieldbus or Ethernet interface.

## Specification

| Property | Value |
|---|---|
| Category | plc |
| Weight | 0.18 kg |
| Processor | Arm9™, 400 MHz |
| Supply voltage | 24 V DC (-15%/+20%) |
| Power consumption | 0.003 kW |
| IP rating | IP20 |
| Operating temp min | 0 °C |
| Operating temp max | 55 °C |

## Connected

- Manufacturer: [Beckhoff Automation](https://machineschema.com/manufacturer/beckhoff.md)
- Protocols: [Modbus TCP](https://machineschema.com/protocol/modbus-tcp.md)

## Safety

- Approvals/markings: CE, UL, ATEX, IECEx, cFMus.
- ATEX marking: II 3G Ex nA IIC T4 Gc; II 3D Ex tc IIIC T135°C Dc.
- IECEx marking: Ex nA IIC T4 Gc; Ex tc IIIC T135°C Dc.
- cFMus marking: Class I, Division 2, Groups A, B, C, D; Class I, Zone 2, AEx ec IIC T4 Gc.

## Study notes

- Product status is regular delivery but not recommended for new projects; the recommended alternative is CX8290.
- Programming languages: IEC 61131-3; control software: TwinCAT 2 PLC; web visualization and web-based management are supported.
- Flash memory is a microSD slot with 512 MB card included and optional expansion; main memory is 64 MB DDR2 RAM and is not expandable.
- Includes an integrated 1-second UPS with 1 MB on the microSD card.
- Bus interface provides 2 x RJ45 switched ports at 100 Mbit/s; I/O connection is E-bus or K-bus with automatic recognition.
- Interfaces include 1 x RJ45 10/100 Mbit/s, 1 x USB device behind the front flap, and 1 x bus interface.
- Dimensions are 64 mm x 100 mm x 73 mm; storage temperature range is -25…+85°C.
- Relative humidity rating is 95%, no condensation.
- Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27; EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4.
- Supports ADS UDP/TCP and open TCP/IP-UDP/IP communication in addition to Modbus TCP.
- Windows Embedded CE 6 extended support has ended; up-to-date security updates can no longer be provided.
- Internal battery-backed clock for time and date; battery is behind the front flap and exchangeable.

## Sources

1. [Embedded PC with Arm9™ and 2-port Ethernet switch](https://www.beckhoff.com/en-en/products/ipc/embedded-pcs/cx8000-arm9/cx8090.html) (accessed 2026-10-25)

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