Signal tower light (also call: led signal tower lights, led indicator lights, led andon lights, led warning lights, led industrial signal lights, or led tower lights) are commonly used on equipment in industrial manufacturing and process control environments to provide visual and audible indicators of a machine's status to machine operators, technicians, production managers . It can offer signal which identify errors as they happen.

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Stack lights are used in a variety of machines and process environments; specific colour-coding is assigned by the system designer.

Commonly used colour codes for machine state conditions include:

RED: Failure conditions such as an emergency stop or machine fault

YELLOW: Warnings such as over-temperature or over-pressure conditions

GREEN: Normal machine or process operation

BLUE: External help request, where an operator might be requesting raw materials, scheduling or maintenance personnel assistance

WHITE: User-defined conditions to a specific machine, often related to productivity monitoring

Optionally an audible alarm buzzer, typically in the range of 90–105dB, may be added to alert machine operators to high priority conditions.

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