---
title: What does the indicator light (Balluff Safety Module) mean?
description: LED indication of safety module
---

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# What does the indicator light (Balluff Safety Module) mean?

## LED indication of safety module

**Status Indicator**

*US: off*

- sensor-less voltage
- Green Sensor voltage is normal
- Red Sensor voltage is less than 17V or greater than 31V

*UA: off*

- No actuator voltage
- Green actuator is normal
- Red actuator is less than 17V or greater than 31V

*IO-LINK: off*

- No IO-LINK communication
- Flashing green IO-LINK communication activates the connection

*Safe mode: off*

- No PROFI safe communication
- Green PROFI safe communication active connection
- Green flashing means 2Hz PROFI safe communication activation user confirmation

*Error: off*

- Normal (Red means faulty)

Please check the manual for more details.![安全](https://kb.innovatingautomation.asia/hs-fs/hubfs/Knowledge%20Base/Simplified%20Chinese/Image/%E5%AE%89%E5%85%A8/%E5%AE%89%E5%85%A8.png?width=310&name=%E5%AE%89%E5%85%A8.png)

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