For engineers, designers, and safety inspectors, having access to the —specifically the current edition, IEC 60073:2002 (often referred to as Basic and safety principles for man-machine interface, marking and identification – Coding principles for indicators and actuators)—is essential for designing compliant HMI (Human-Machine Interface) systems. What is IEC 60073?
IEC often provides the table of contents , scope , and normative references for free on their website.
The standard is a "" as defined by the IEC Guide 104 . This high-level designation means its principles are fundamental to ensuring the safety of people, property, and the environment across many industries.
Emergency, danger, or faulty condition. (e.g., "Emergency Stop").
Yes, indirectly. Virtual buttons on an HMI should follow the same color meanings. However, tactile coding does not apply to touchscreens.
Understanding the standard's history provides context for its authority. The development of IEC 60073 has been a multi-decade effort to refine and unify man-machine signaling:
Warning or danger (higher frequency = higher urgency). Why You Need the IEC 60073 PDF
IEC 60073: Basic and safety principles for man-machine interface, marking and identification — Coding principles for indicators and actuators
IEC 60073 defines coding across three modalities:
The current valid edition is 6.0 from 2002, but Edition 7.0 is actively under development. According to the IEC work program:
Over the years, several myths have emerged around this standard. Let’s debunk them:
Finding the official "iec 60073 pdf" can be confusing. Here is a guide:
The first test came in the form of a storm. Lightning struck the substation and sensors flooded the control system with alarms. In the chaos, the standard’s lexicon proved its worth. Operators—some new, some half-asleep—responded in sync. Where previously overlapping alerts had created confusion, now the hierarchy of symbols guided hands and attention. A red flashing beacon pulled the senior engineer to the transformer room; a low repeating tone told a junior technician to isolate a feeder; a green steady light confirmed a successful reset. The plant staggered but held.
Familiar, consistent interfaces allow operators to work faster and with fewer mistakes.
Looking for IEC 60073 PDF (Colour coding for indicators/buttons)
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