How do I calculate Safety Stop Category Selection (IEC 60204-1)?

To calculate Safety Stop Category Selection (IEC 60204-1): Enter Machine type / drive type, Required PLr, Measured / estimated stop time. Click Calculate. INDUGRID computes the result instantly using the formula: Category 0: Immediate removal of power (coast to stop) Category 1: Controlled stop → power removed when stopped Category 2: Controlled stop → power maintained. No registration required.

What units does the Safety Stop Category Selection (IEC 60204-1) calculator use?

The Safety Stop Category Selection (IEC 60204-1) calculator uses the following units: ms. SI units are used by default.

Is the Safety Stop Category Selection (IEC 60204-1) calculator free?

Yes. The INDUGRID Safety Stop Category Selection (IEC 60204-1) calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Machine Safety

Safety Stop Category Selection (IEC 60204-1)

Determine the appropriate stop category and required safety stop time based on machine characteristics and risk level.

Units:

in LinkedIn

💡Stop Category 0 is the safest — power is immediately removed. Category 1 is a controlled stop with delayed power removal. Category 2 maintains power for CNC / servo systems where stopping position matters. Never use Category 2 as a safety stop unless specifically designed for it.

Category 0: Immediate removal of power (coast to stop) Category 1: Controlled stop → power removed when stopped Category 2: Controlled stop → power maintained

Input

Machine type / drive type iThe type of drive directly affects which stop category is feasible.

Required PLr iRequired Performance Level determined from risk assessment.

Measured / estimated stop time iTime for the machine axis to reach standstill after stop command, in milliseconds. Measure on actual machine.

Result

Recommended stop category —

Required standstill monitoring —

Typical safety device —

Implementation notes —