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Beckhoff CX8031

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.

Source checked9/9 values · 2026-10-25Beckhoff AutomationEmbedded PC
CX8031X11 × ETHERNETArm9 400 MHz24 V DC (-15%/+20%)IP20CX8031 · FRONTSchematic · port count from spec
IP rating
IP20
Weight
0.18kg

Specification

1 source
Categoryembedded pc
Ethernet ports1
ProcessorArm9 400 MHz
Supply voltage24 V DC (-15%/+20%)
Power consumption0.003 kW
Operating temp min0 °C
Operating temp max55 °C

Quick answers

How much does the Beckhoff CX8031 weigh?
0.18 kg, per Embedded PC with Arm9™ and PROFIBUS slave (beckhoff.com).
What is the IP rating of the Beckhoff CX8031?
IP20, per Embedded PC with Arm9™ and PROFIBUS slave (beckhoff.com).

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.

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.
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