Depends a lot on the application, region and where on the equipment. For
example, for machinery, if the LEDs are part of the operator interface or
machine-mounted control device, both EN 60204-1 (IEC 60204-1) and ANSI/NFPA
79 have specific requirements for "INDICATOR LIGHTS" in general (not
specific to LEDs). (As always, the two standards [US/EU] are similar, but
not exactly the same.)
Note that red is supposed to be used only for "emergency". Normal operation
should _not_ be an emergency. Machine stopped is usually also a safe
condition, not an emergency.
For example, EN (and IEC) 60204-1:
(IMPORTANT: See section 10.3.2 for exceptions and additional requirements.)
Colour Meaning Explanation Action by operator
------ --------- -------------------
---------------------------------------
RED Emergency Hazardous condition Immediate action
to deal with hazardous
condition (e.g. by
operating E-stop)
YELLOW Abnormal Abnormal condition; Monitoring and/or
intervention (e.g. by
Impending critical condition re-establishing
the intended function)
GREEN Normal Normal condition Optional
BLUE Mandatory Indication of a condition that Mandatory action
requires action by operator
WHITE Neutral Other conditions; may be used Monitoring
whenever doubt exists about
use of RED,YELLOW,GREEN,BLUE
If the LEDs were inside the machine, only visible to a service technician,
you might consider that they were not "operator interface".
Other sectors/products/regions will have different requirements, let's see
what we can collect via this listserver.
best regards, glyn
----------------------------------------------
TUV Rheinland of North America, Inc.
Product Safety & Quality
Industrial Machinery Division (Chicago Office)
Glyn R. Garside
Senior Engineer
1945 Techny Rd, Unit 4
NORTHBROOK, IL 60062-5357, USA
Tel (847)562-9888 ext 25
Cell (847)612-1574
Fax (847)562-0688
email [email protected]
http://www.us.tuv.com
Luiz Claudio Bonilla de
Araujo To:
[email protected]
<[email protected]> cc:
[email protected]
Sent by: Subject: LED Color
owner-emc-pstc@majordom
o.ieee.org
03/21/2002 15:08
Please respond to Luiz
Claudio Bonilla de
Araujo
<Does anybody know any standard or guideline regarding the colors used in
LED
displays? Usual applications commonly apply green for "ON" and red for
"OFF", but I would like to know if there is any national / international
standard that specifies the LED color according to the function that it is
informing to the user (eg. alarm, continuous operation, high/low speed,
etc.) >
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