{"id":"beckhoff-cx8191","model_id":"CX8191","name":"Beckhoff CX8191","summary":"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.","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_notes":["CE and UL approvals/markings."],"sources":[{"url":"https://www.beckhoff.com/en-en/products/ipc/embedded-pcs/cx8100-arm-r-cortex-r-a9/cx8191.html","title":"Embedded PC with Arm® Cortex®-A9 and BACnet/IP","accessed":"2026-10-25"}],"verification":{"status":"source_checked","checked_at":"2026-10-25","values":12,"method":"llm_source_check"},"updated_at":"2026-10-25","type":"hardware","spec":{"category":"embedded_pc","manufacturer":"beckhoff","controllers":[],"weight_kg":0.23,"ethernet_ports":3,"processor":"Arm® Cortex®-A9, 800 MHz","supply_voltage":"24 V DC (-15%/+20%)","power_consumption_kw":0.004,"ip_rating":"IP20","operating_temp_min_c":-25,"operating_temp_max_c":60,"joints":[],"protocols":["opc-ua","mqtt","modbus-tcp"],"standards":[],"error_codes":[]},"url":"https://machineschema.com/hardware/beckhoff-cx8191","license":"https://creativecommons.org/licenses/by/4.0/"}