Mistake-Proofing Resource Center

Indicator Lights

Indicator lights are operate alone or in columns with up to five lights. Each light in the column is used to signal a different operating condition. These lights need to be triggered from a relay, PLC, or process controller.


  • Low levels of parts in an assembly line.
  • Equipment waiting to be changed over.
  • Deviation of a process parameter from its set point.
  • Which piece of equipment to start next in the line sequence.
  • Denoting whether a part or container is or is not in the proper position.


  • Multiple colored lenses can indicate status.
  • Some indicator lights can be stacked in columns.
  • Can be located remotely from the process.
  • Some models offer an optional sound module.
  • Can be surface mounted or pole mounted (for 360° visibility).