All contributors to this thread have some merit. Monitoring this thread, it illiterates to me the need for more standardization. RE: Standard Color for indicator lights daveshei (Electrical) 19 Apr 03 16:26 Illuminated Pushbutton Any function not covered by the above colors Pilot Light Any function not covered by the above colors Pushbutton Any function not covered by the above colors Illuminated Pushbutton Confirmation that a circuit has been energized or function or movement of the machine has been started/Start On, or any preselection of a function Energizing of auxiliary function or circuit not related to the working cycle start or preselection of direction of feed motion or speeds. Pilot Light Normal Condition Confirmation Normal pressure, temperature. Control or auxiliary function not directly related to the working cycles. Pushbutton Any function not covered by thee above. Pushbutton No specific function assigned Shall be permitted to be used for any function except for buttons with the sole function of Stop or Off inching or jogging. Illuminated Pushbutton Machine or Unit ready for operation/Start or On Start or On after authorization by lights start of one or more motors for auxiliary functions start or energization of machine elements. Machine ready for operation with all conditions nornal or cycle complete and machine ready to be restarted. Pilot Light Machine Ready Safety Indication of safe condition or authorization to proceed. Pushbutton Start-On General or machine start start of cycle or partial sequence Some value (pressure, temperature) is approaching its permissable limit pressing button to override other functions previously selected. Illuminated Pushbutton Attention or caution/Start of an operation intended to avoid dangerous conditions. Overload that is permitted for a limited time. Automatic cycle or motors running some value (pressure, temperature) is approaching its permissable limit. Change or impending change of conditions. Pilot Light Attention, caution/marginal condition. Return of machine elements to safe position, override other functions previously selected. Pushbutton Return, Emergency Return, Intervention - suppress abnormal conditions. (the color RED for the emergency stop actuator shall not depend on the illumination of its light). Illuminated Pushbutton Machine stalled because of overload, etc. Indication that a protective device has stopped the machine, e.g. Pilot Light Danger or alarm, abnormal condition requiring immediate attention. Pushbutton Emergency Stop, Stop, Off Emergency Stop button, Master Stop button, Stop of one or more motors. RE: Standard Color for indicator lights peebee (Electrical) 6 Mar 03 19:31Ĭolor Coding for pushbuttons, indicator (pilot) lights, and illuminated pushbuttonsĬolor Device Type Typical Function Examples If you do not agree with this interpretation, ask any police officer what you are expected to do if you are already in an intersection and the light goes from Yellow to Red: Do you STOP or do you get the hell out? Yellow of course then means "Warning, this intersection is about to become very dangerous for you!"Īs far as I am concerned, this follows the vast majority of industrial color code logic. Green doesn't necessarily mean you MUST Go, it means "OK to do whatever you want to in that intersection, including stopping in the middle, smoking a cigaret etc., because it is safe for you as long as it is still Green (and the guy behind you does not have a gun)!" It really means "Danger: You will likely be killed or injured if you Go into (or stay in) this intersection!" Red does not mean Stop, since you may already have been stopped for some other reason. Actually, if you take the Red = Dangerous, Green = Ready philosophy and forget Go and Stop issues, then even a traffic light follows.
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