The three diagnostic LEDs show the status of the input voltage, the output voltage, and the state of charge and indicate possible error states.

A special feature of the Beckhoff CU81xx devices is OCT (One Cable Technology) as communication technology between UPS and Industrial PC. This means that the two connecting lines (+24 V, 0 V) between the Industrial PC and the UPS are used not only to supply the Industrial PC, but also for bidirectional, modulated data transmission. If both sides are OCT-capable, no further connection, e.g., via USB, is required. This simplifies cabling and also allows longer connection distances compared to USB.

All UPS devices of the CU81xx series have permanent wiring via two 9-pin plugs, so that the wiring does not have to be disconnected during service.

Note: Please refer to the product documentation for the retention times that can be achieved with the UPS and important information on installation and safe operation of the devices.