What is the standard Tower Stack Light?
A typical tower light has three to five colored segments. Each color should represent a distinct machine status (e.g., Red = Fault, Amber = Warning, Green = Running, Blue = Maintenance, White = Custom).
It is tempting to select the tallest tower with the most colors “just in case”. But the best installations are usually simple and clear.
- 1 layer: Perfect for compact machines where only one critical state is indicated – typically red for alarm or stop.
- 2 layers: A common combination is red (fault) + green (run). Many small machines and workstations use this configuration.
- 3 layers: Red (fault), amber (warning), green (normal). This is very popular on automated lines and CNC machines.
- 4 layers: Adds blue (operator call) or white (special mode) to the standard three-color set.
- 5 layers: Maximum flexibility for complex processes with multiple sub-states.