The Beckhoff CX8091 is a versatile and compact embedded PC designed to meet the demands of building and industrial automation. With its ARM9™ 400 MHz processor, it delivers a balance of efficiency and performance, making it an excellent choice for distributed control systems where low power consumption and reliable operation are essential.

One of the standout capabilities of the CX8091 is its support for dual communication standards: BACnet/IP and OPC UA. BACnet/IP is widely used in building automation applications such as HVAC, energy management, and lighting control. OPC UA, on the other hand, provides a secure, platform-independent framework for integrating data with IT systems, enabling vertical communication from the factory floor to enterprise-level software. While the controller supports both, it is generally recommended to use one protocol at a time to ensure optimal resource allocation within its compact design.

The hardware configuration offers both durability and flexibility. The unit comes with 64 MB of DDR2 RAM (non-expandable) and a microSD card slot that includes a 512 MB card by default, with options for expansion. An integrated 1-second UPS adds reliability by ensuring that 1 MB of data can be securely written to the microSD card during an unexpected power outage. This feature protects critical process data and reduces the risk of system errors or data loss in sensitive applications.

Designed to integrate seamlessly into Beckhoff’s modular system, the CX8091 automatically detects whether K-bus or E-bus Bus Terminals are connected on startup. This compatibility makes it highly scalable, allowing engineers to add digital, analogue, or specialty I/O modules as needed. Combined with the passive cooling design, the CX8091 delivers silent and maintenance-free operation, ideal for installation in distributed locations or confined control cabinets.

From a software perspective, the CX8091 runs TwinCAT PLC runtime, which transforms the embedded hardware into a fully capable PLC. Engineers can program using IEC 61131-3 languages, ensuring flexibility and compatibility with industry standards. Features like web visualisation and online change enhance usability, enabling operators to interact with applications via a browser and make live adjustments without system downtime.

The CX8091 is particularly well-suited for building automation, where its BACnet/IP support allows it to act as a reliable local controller, or for industrial systems where OPC UA enables secure data exchange with higher-level IT platforms. Typical use cases include HVAC control, lighting systems, energy monitoring, or integration with enterprise analytics platforms.

With its combination of robust communication options, modular I/O flexibility, and reliable data protection, the Beckhoff CX8091 provides engineers and integrators with a future-ready embedded PC that bridges traditional automation needs with modern IT integration.