Embedded PC for BACnet/IP and OPC UA CX8091
Ethernet RJ 45 (switched)
10/100 Mbit/s
Ethernet RJ 45 (switched)
10/100 Mbit/s
Ethernet port
Address selector
Power LEDs
Input for
power contacts
Power contacts
Coupler supply
E-bus or K-bus
Front flap

CX8091 | Embedded PC for BACnet/IP and OPC UA

The CX8091 is a control system with a switched Ethernet port. It supports the BACnet and OPC UA protocols. K-bus or E-bus terminals can be attached as required; the CX8091 automatically recognises the type of I/O system connected during the start-up phase. The control system is programmed with TwinCAT 2 via the fieldbus interface or the additional Ethernet interface.

BACnet (Building Automation Control Network) is a standardised, manufacturer-independent communication protocol for building automation. Areas of application include HVAC, lighting control, safety and fire alarm technology.

The TwinCAT OPC UA Server provides the functionality of the OPC Unified Architecture (UA) specification. In addition to data access techniques UA also specifies the data coding and the transport protocols.

Technical data CX8091
Processor ARM9, 400 MHz
Flash memory 512 MB microSD (optionally expandable)
Main memory 64 MB DDR2 RAM (not expandable)
Protocol BACnet/IP or OPC UA
Programming TwinCAT 2 PLC
Programming languages IEC 61131-3
Web visualisation yes
Online change yes
Up/down load code yes/yes
Interfaces 1 x RJ45 10/100 Mbit/s, 1 x USB device (behind the front flap), fieldbus interface
Bus interface 2 x RJ45 (switched)
I/O connection E-bus or K-bus, automatic recognition
Clock internal battery-backed clock for time and date (battery behind the front flap, exchangeable)
UPS 1-second UPS (for 1 MB of persistent data)
Operating system Microsoft Windows Embedded CE 6
Web-based management yes
Current supply E-bus/K-bus 2 A
Max. power loss 3 W
Dimensions (W x H x D) 64 mm x 100 mm x 73 mm
Weight approx. 180 g
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 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
Protection class IP 20
Approvals/Markings CE, UL, ATEX, IECEx
Ex-Marking II 3 G Ex nA IIC T4 Gc
II 3 D Ex tc IIIC T135 °C Dc
Ex nA IIC T4 Gc
Ex tc IIIC T135 °C Dc
CX1900-01xx Optionally expandable memory ex factory.
Instead of 512 MB microSD card: 1, 2, 4 and 8 GB microSD card
CX1900-01xx Aditionally expandable memory: 1, 2, 4 and 8 GB microSD card
BACnet/IP For further BACnet/IP products please see the system overview.