Standardizing emergency stop colors (Red) and warning signs (Yellow) prevents confusion during critical situations.
: Used to draw higher attention (e.g., a flashing red light is more urgent than a steady one).
Used to suppress an abnormal condition, reset a fault condition, or intervene during a warning state. Blue: Used for mandatory intervention resets. iec 60073 pdf
The IEC 60073 standard has a long history of development. The current valid edition is , published on May 22, 2002. It superseded earlier editions from 1996, 1991, 1984, 1975, and the original 1955 edition.
In industrial automation and electrical engineering, clear communication between machines and human operators is critical. A single misunderstood signal can lead to costly downtime, equipment damage, or severe workplace injuries. To standardize how machines communicate status and accept commands, the International Electrotechnical Commission established . Standardizing emergency stop colors (Red) and warning signs
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When designing an HMI per IEC 60073:
Stop guessing your HMI colours. Get the standard that prevents 90% of operator errors.
| Myth | Reality per IEC 60073 | |------|------------------------| | “Green means go, red means stop – same as traffic lights.” | In traffic lights, red means stop and green means go. In machinery, green = normal/ready, red = fault/emergency. An emergency stop button is red. A start button is green. Consistent, but not identical to traffic logic. | | “Flashing red means alarm; steady red means stop.” | Both are red = danger. Flashing only increases urgency, not changes meaning. | | “Blue means cold/water.” | No – blue means “mandatory action” (e.g., reset a lockout). | | “White is for neutral start.” | Correct – white has no safety meaning; use for general functions. | Blue: Used for mandatory intervention resets
Indicates a warning or emergency state, with higher frequencies or faster pulsing representing higher urgency. Key Applications of the Standard