# Beckhoff CX8031

Hardware · `CX8031` · verification: source checked

The CX8031 is a Beckhoff control system (embedded PC) with a PROFIBUS slave interface, one Ethernet port and a USB device port. It runs TwinCAT 2 PLC software on Windows Embedded CE 6 and accepts E-bus or K-bus terminals, whose type it recognises automatically at start-up. The PROFIBUS address is set with two rotary switches and the transmission rate is detected automatically up to 12 Mbaud.

## Specification

| Property | Value |
|---|---|
| Category | embedded pc |
| Weight | 0.18 kg |
| Ethernet ports | 1 |
| 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)

## Safety

- Protection rating IP20.
- Approvals/markings: CE, UL, ATEX, IECEx, cFMus.
- ATEX marking: II 3G Ex nA IIC T4 Gc and II 3D Ex tc IIIC T135°C Dc.
- IECEx marking: Ex nA IIC T4 Gc and 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.
- 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.
- Permitted operating temperature range 0…55 °C.
- Extended support for the operating system Microsoft Windows Embedded CE 6 has ended; up-to-date security updates can no longer be provided.

## Study notes

- Programming languages: IEC 61131-3; control software TwinCAT 2 PLC; programming is done via the additional Ethernet interface.
- Bus interface is 1 x D-sub 9-pin socket with shielding; PROFIBUS address set via two rotary selection switches; automatic baud rate detection.
- Ethernet interface is 1 x RJ45 10/100 Mbit/s; a USB device port sits behind the front flap.
- I/O connection is E-bus or K-bus with automatic recognition; E-bus/K-bus current supply 2 A, max. E-bus/K-bus power consumption 10 W (5 V/max. 2 A).
- Main memory 64 MB DDR2 RAM, not expandable; flash memory is a microSD slot with 512 MB card included, optionally expandable.
- Integrated 1-second UPS with 1 MB on microSD card; UPS OCT-capable: no.
- Internal battery-backed clock for time and date; battery behind the front flap and exchangeable.
- Cooling is passive; dimensions 64 mm x 100 mm x 73 mm; weight approx. 180 g.
- Web visualization and web-based management supported; online change supported; up/down load code yes/yes.
- Storage temperature -25…+85 °C; relative humidity 95%, no condensation.
- Product status: regular delivery, not recommended for new projects; recommended alternative CX8200.
- PROFIBUS slave interface is described in the document but no PROFIBUS entry exists in the available protocol list.

## Sources

1. [Embedded PC with Arm9™ and PROFIBUS slave](https://www.beckhoff.com/en-en/products/ipc/embedded-pcs/cx8000-arm9/cx8031.html) (accessed 2026-10-25)

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