Safety of machinery—Emergency stop function—Principles for design
1Key Takeaways
This document specifies the functional requirements and design principles for the emergency stop function of the machine, and is applicable to the emergency stop function using any form of energy. This document applies to all machinery except the following two types of machines: --- machines whose emergency stop functi…
2Expert Interpretation
In-depth analysis of the national standard GB/T16754-2021 "Design Principles for Mechanical Safety Emergency Stop Functions", covering core contents such as emergency stop device requirements, control range division, stop category selection, etc., and providing an emergency stop system design implementation guide that complies with ISO13850:2015.
Interpretation of the core content of the standard
GB/T16754-2021, as a Class B2 safety standard, stipulates the design principles and safety requirements for the emergency stop function of mechanical equipment.
- Five new term definitions (emergency stop device, control range, etc.)
- Detailed safety requirements for emergency stop functions
- Supplementary clauses to prevent accidental actuation
- Added requirements for portable operating stations
Comparison of key technical requirements
| Technical elements | Requirements of the 2008 version | New/changed in the 2021 version |
|---|---|---|
| Type of emergency stop device | Button/cord/handle | Explicitly add foot pedal without protective cover (limited to special circumstances) |
| Control range | Unclear division principle | New graphical requirements and overlapping area management |
| Safety level | Unclear PL/SIL | Requires at least PLr=c or SIL1 |
Analysis of implementation points
Example of emergency stop device selection
An automated production line uses a PILZ emergency stop button, which meets the following requirements:
- Red mushroom head diameter ≥40mm
- Mechanical latch direct disconnect structure
- Background color is RAL1021 yellow
- Installation height 1.2m (above standing surface)
Stop category selection
For high inertia equipment:
- Category 0 stop: stamping equipment and other scenarios that require immediate power off
- Category 1 stop: large fans and other scenarios that require controllable deceleration
Standard application recommendations
Special attention should be paid during the design phase:
- Visualization of the correspondence between the emergency stop device and the control range
- Failure mode analysis of the wireless emergency stop system
- Risk management of overlapping areas of multiple control ranges
It is recommended to refer to IEC60204-1 for electrical emergency stop circuit verification testing.