CX8191 Beckhoff
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The Beckhoff CX8191 is part of the CX Embedded PC Systems series and is built around an ARM Cortex-A9 processor. It has a BACnet fieldbus interface for both client and server roles, and supports 1 Ethernet port. The system uses a 512 MB microSD for storage and is configured with TwinCAT 3.
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Product Description:
The CX8191 is an embedded PC assembled by Beckhoff for the CX Embedded PC Systems series. It serves as a compact controller for distributed I/O stations and small automation cells. The unit combines an industrial CPU, fieldbus coupler, and runtime environment in one DIN-rail-mounted housing, allowing it to execute PLC logic, manage network communication, and scan connected I/O without requiring a separate rack-mounted PC. This integrated design also reduces the amount of control hardware needed inside an electrical enclosure.
The computing core uses an Arm Cortex-A9 processor, and application code is created in the TwinCAT 3 environment. The programming environment follows the IEC 61131-3 standard, supporting established languages for industrial control applications. A single Ethernet port provides network access and real-time data exchange, while a separate bus connector supports one I/O backbone. The minimum PLC cycle time can be as low as 500 µs, making the controller suitable for high-speed sequences such as counting and cam switching. The dedicated fieldbus interface supports BACnet client and server functions, allowing the controller to exchange data with remote HVAC, lighting, and building-automation devices. Because the unit has no monitor port, configuration and diagnostics are performed through the network connection. K-bus or E-bus terminals attach directly to the right side of the housing and receive power through the terminal bus contacts.
Data and diagnostic information remain protected during short power interruptions because a 1-second UPS provides enough time to save persistent variables to a 512 MB microSD card. Typical I/O task times range from 1 to 50 ms, accommodating process loops used in packaging equipment, conveyor systems, and environmental controls. The internal scheduler maintains deterministic timing as the configured scan list grows. The terminal bus arrangement allows connected I/O modules to communicate directly with the controller through the side-mounted contacts. The absence of active cooling components reduces mechanical wear and eliminates the need to maintain an internal cooling fan.
