Multi Layer Stack Lights

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