LIGHTS ONAS-Interface signal towers provide visual and/or audible status indication in industrial automation applications. The stacklights have an IP65 housing to protect against water and dust and can be powered directly by an AS-Interface cable or an auxiliary power supply. They are available in red, yellow, green, blue and clear LED color options and provide 100,000 hours, or more than 11 years, of continuous operation. Audible alarms up to 105 dB are also available. Up to 31 signal towers can be connected on a single network.