Actuators initiate actions. The color of a pushbutton dictates what will happen when it is pressed:

For pilot lights, tower lights (stack lights), and software HMI screens, the standard categorizes colors into distinct safety and operational tiers: Explanation Action Required Emergency / Danger

When searching for an , engineers, safety officers, and system integrators are typically looking to align their panel designs with global safety mandates. This article breaks down the core principles found within the official document to help you implement compliant visual, acoustic, and tactile coding systems. Scope and Purpose of the Standard

Flash rate frequencies (Hz) for blinking lights to differentiate between high-priority and medium-priority alarms.

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IEC 60073 does not exist in isolation. It serves as a that is referenced by numerous other safety standards.

Complete Guide to IEC 60073: Coding Principles for Indicators and Actuators Introduction

Having the official IEC 60073 PDF provides several advantages:

The table below summarizes the core meaning of each color based on the standard's principles:

Color is the fastest way for the human brain to process information. IEC 60073 defines a strict color hierarchy based on urgency and safety risk. 1. Visual Indicators (Indicator Lights and Pilot Lights)

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Establish uniform coding across different manufacturers and countries.

The primary objective of the standard is to increase workplace safety and operational efficiency by making human-machine interfaces (HMIs) intuitive, unambiguous, and consistent across different manufacturers and countries. Core Principles of Coding in HMIs

While IEC 60073 is the foundation for coding, other standards complement it. Here's a brief comparison:

Physical button shapes (e.g., mushroom-head buttons for emergency stops) allow operators to identify controls blindly in low-visibility environments or high-stress situations. Why Compliance Matters

A flashing light often means an action is required immediately. Once the operator acknowledges the fault, the light typically transitions to a steady state.

Relying solely on color can introduce risks, particularly for colorblind operators or in environments with poor lighting. The IEC 60073 standard mandates supplementary coding methods:

By standardizing these visual and physical cues, IEC 60073 minimizes human error, reduces industrial accidents, and streamlines cross-border manufacturing compliance. Core Coding Principles in IEC 60073

The standard uses multiple sensory channels to convey information to operators. The three primary coding methods are: