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Beckhoff CX8191

The Beckhoff CX8191 is a control system with an Arm Cortex-A9 processor and TwinCAT 3 runtime. It connects to E-bus or K-bus I/O terminals and has a switched Ethernet bus interface. It supports BACnet for building automation and can also use OPC UA, MQTT, and Modbus TCP.

Source checked12/12 values · 2026-10-25Beckhoff AutomationEmbedded PC
CX8191X1X2X33 × ETHERNETArm® Cortex®-A9, 800 MHz24 V DC (-15%/+20%)IP20CX8191 · FRONTSchematic · port count from spec
IP rating
IP20
Weight
0.23kg

Specification

1 source
Categoryembedded pc
Ethernet ports3
ProcessorArm® Cortex®-A9, 800 MHz
Supply voltage24 V DC (-15%/+20%)
Power consumption0.004 kW
Operating temp min-25 °C
Operating temp max60 °C

Quick answers

How much does the Beckhoff CX8191 weigh?
0.23 kg, per Embedded PC with Arm® Cortex®-A9 and BACnet/IP (beckhoff.com).
What is the IP rating of the Beckhoff CX8191?
IP20, per Embedded PC with Arm® Cortex®-A9 and BACnet/IP (beckhoff.com).

Study notes

  • Supports BACnet protocol; the BACnet license is already installed on the device.
  • With EL6861 BACnet-MS/TP terminals, the CX8191 can act as a router to MS/TP networks, including support for several MS/TP networks.
  • Further TwinCAT 3 protocols include Modbus RTU, which has no matching protocol id in the schema.
  • TwinCAT 3 platform level is Economy (20); programming is done with TwinCAT 3 via the fieldbus interface or the additional Ethernet interface.
  • Operating system is Windows Embedded Compact 7; extended support has ended, security updates are no longer provided, and TwinCAT is supported only up to build 4024.
  • Product status is regular delivery, not recommended for new projects; the recommended alternative is CX8290.
  • I/O connection supports E-bus or K-bus terminals, with automatic recognition of the connected I/O system during start-up.
  • Bus interface provides 2 x RJ45 switched ports at 100 Mbit/s; the separate Ethernet interface is 1 x RJ45 10/100 Mbit/s.
  • Main memory is 512 MB DDR3 RAM (not expandable); flash memory is a microSD slot with 512 MB card included.
  • Includes an integrated 1-second UPS with 1 MB on microSD card and a battery-backed clock for time and date (exchangeable battery behind front flap).
  • Current supply for E-bus/K-bus is 2 A; max power consumption is 4 W, 9 W with UPS loading, and 10 W for E-bus/K-bus (5 V/max. 2 A).
  • Dimensions 71 x 100 x 73 mm; storage temperature -40…+85°C; relative humidity 95% no condensation; vibration/shock conforms to EN 60068-2-6/-2-27; EMC conforms to EN 61000-6-2/-6-4.

Safety

  • CE and UL approvals/markings.
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