# C263A26 Index Out of Range

Alarm codes · `C263A26` · verification: source checked

Logging the missing index mark position failed because the index is outside the valid range. The code includes an unsigned value.

## Specification

| Property | Value |
|---|---|
| Code | C263A26 |
| Meaning | The missing index mark position could not be logged because the index is out of range. |
| Remedy | Perform a complete reboot sequence, update the software, or contact your local Universal Robots service provider for assistance. |

## Connected

- Controllers: [Universal Robots e-Series Control Box](https://machineschema.com/controller/universal-robots-e-series-control-box.md)

## Sources

1. [C263 Motor Encoder](https://www.universal-robots.com/manuals/EN/HTML/SW5_26/Content/prod-err-codes/topics/CODE_263.html) (accessed 2026-10-26)

---

Source page: https://machineschema.com/alarm/ur-c263a26  
JSON: https://machineschema.com/alarm/ur-c263a26.json  
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite Machine Schema and the original sources.