{"id":"beckhoff-cx8091","model_id":"CX8091","name":"Beckhoff CX8091","summary":"The Beckhoff CX8091 is a control system with a switched Ethernet port and a bus interface for E-bus or K-bus terminals. It automatically recognizes the connected I/O system during start-up and is programmed with TwinCAT 2 through the fieldbus interface or the additional Ethernet interface. It supports BACnet or OPC UA, with simultaneous use not recommended due to the small memory.","study_notes":["Product status: regular delivery, not recommended for new projects; recommended alternative is CX8290.","BACnet is supported as an alternative protocol to OPC UA; simultaneous use is not recommended due to the small memory.","I/O connection accepts E-bus or K-bus terminals and automatically recognizes the connected I/O system during start-up.","Programming languages: IEC 61131-3; control software: TwinCAT 2 PLC.","Main memory: 64 MB DDR2 RAM, not expandable. Flash memory: microSD slot with 512 MB card included, optionally expandable.","Integrated 1-second UPS with 1 MB on microSD card.","Interfaces: 1 x RJ45 10/100 Mbit/s, 1 x USB device behind the front flap, 1 x bus interface; the bus interface has 2 x RJ45 switched at 100 Mbit/s.","Cooling is passive; diagnostics LEDs are 1 x TC status, 1 x WD and 1 x error.","Internal battery-backed clock for time and date; battery behind the front flap and exchangeable.","Current supply for E-bus/K-bus: 2 A. Max power consumption for E-bus/K-bus: 10 W (5 V/max. 2 A).","Dimensions: 64 mm x 100 mm x 73 mm. Relative humidity: 95%, no condensation. Storage temperature: -25…+85°C.","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."],"safety_notes":["Approvals/markings: CE, UL, ATEX, IECEx, cFMus.","ATEX marking: II 3G Ex nA IIC T4 Gc; II 3D Ex tc IIIC T135°C Dc.","IECEx marking: Ex nA IIC T4 Gc; Ex tc IIIC T135°C Dc.","cFMus marking: Class I, Division 2, Groups A, B, C, D; Class I, Zone 2, AEx ec IIC T4 Gc.","Windows Embedded CE 6 extended support has ended; up-to-date security updates can no longer be provided."],"sources":[{"url":"https://www.beckhoff.com/en-en/products/ipc/embedded-pcs/cx8000-arm9/cx8091.html","title":"Embedded PC with Arm9™ and BACnet/IP or OPC UA","accessed":"2026-10-25"}],"verification":{"status":"source_checked","checked_at":"2026-10-25","values":10,"method":"llm_source_check"},"updated_at":"2026-10-25","type":"hardware","spec":{"category":"plc","manufacturer":"beckhoff","controllers":[],"weight_kg":0.18,"ethernet_ports":3,"processor":"Arm9™, 400 MHz","supply_voltage":"24 V DC (-15%/+20%)","power_consumption_kw":0.003,"ip_rating":"IP20","operating_temp_min_c":0,"operating_temp_max_c":55,"joints":[],"protocols":["opc-ua"],"standards":[],"error_codes":[]},"url":"https://machineschema.com/hardware/beckhoff-cx8091","license":"https://creativecommons.org/licenses/by/4.0/"}