This issue represents a step ahead in harmonizing approaches in functional safety!
This fourth edition cancels and replaces the third edition (ISO 13849-1:2015), which has been technically revised.
The main changes are as follows:
- the whole document was reorganized to better follow the design and development process for control systems;
- new Clause 4 on recommendation for risk assessment;
- specification of the safety functions (updated Clause 5);
- combination of several subsystems (updated in Clause 6);
- new Clause 7 on software safety requirements;
- new Clause 9 on ergonomic aspects of design;
- validation (updated Clause 8 and moved to Clause 10);
- new G.5 on management of the functional safety;
- new Annex L on electromagnetic interference (EMI) immunity;
- new Annex M with additional information for safety requirements specification;
- new Annex N on fault-avoiding measures for the design of safety related software;
- new Annex O with safety-related values of components or parts of the control systems.