🛡️ Machine Safety
Machine Safety Calculators
Performance Level (ISO 13849), MTTFd, safe distances (ISO 13857), light curtain installation (ISO 13855), stop categories, safety relay selection and risk assessment (ISO 12100).
⚡ Quick answer
INDUGRID provides 7 free Machine Safety engineering calculators for professional use. Performance Level (ISO 13849), MTTFd, safe distances (ISO 13857), light curtain installation (ISO 13855), stop categories, safety relay selection and risk assessment (ISO 12100).
Performance Level (PL) Determination
Determine the required Performance Level (PLr) for a safety function according to ISO 13849-1, based…
Risk graph: S (severity) × F (frequency) × P (avoidance) → PLr
MTTFd — Mean Time to Dangerous Failure
Calculate MTTFd (Mean Time to Dangerous Failure) for safety components, a key parameter in ISO 13849…
MTTFd [years] = B10d / (0.1 × n_op) where n_op = operating cycles per year
Safety Guard Distance (ISO 13857)
Calculate the minimum safe distance between a danger zone and a protective structure (fixed guard, f…
Ds = K × (T_s + T_r + T_c) for presence-sensing devices (ISO 13855)
Light Curtain / AOPD Safe Distance (ISO 13855)
Calculate the minimum safe distance for installing an Active Opto-electronic Protective Device (AOPD…
Ds = K × (T_s + T_r + T_c) + C | C = 8 × (d − 14) [detection zone addition]
Safety Stop Category Selection (IEC 60204-1)
Determine the appropriate stop category and required safety stop time based on machine characteristi…
Category 0: Immediate removal of power (coast to stop)
Category 1: Controlled stop → power removed when stopped
Category 2: Controlled stop → power maintained
Safety Relay / Device Selection Helper
Guided selection of the appropriate safety relay type based on application, PLr and required safety …
PL_sys = f(MTTFd, DCavg, CCF, Architecture category) — per ISO 13849-1 Annex K
Risk Assessment Matrix (ISO 12100)
Structured risk assessment following ISO 12100 methodology. Evaluate risk level and determine if ris…
Risk = Severity × Probability × Exposure → Risk level → Risk reduction measures → Residual risk