Functional Safety according to IEC 61508

Functional safety

A customer designing and manufacturing a protection system for high loads on cranes and lifting devices need to establish the achieved functional safety for the protective system.

Requirements

Perform reliability prediction and an FMEDA analysis in line with IEC 61508 in order to establish the following parameters:

  • Safe Failure Fraction (SFF)
  • Diagnostic Coverage (DC)

Analysis

Based on the parts list from the customer a reliability prediction analysis was performed. Together with the customer the functional safety of the system was analysed, based on functions and supporting components were group with each function. In the FMEDA each failure mode were marked as safe or dangerous and it was analyzed whether the failure mode was detected or not.

Customized calculations and reports were developed and produced for the customer to submit to the certifying body.