BSI has published BS EN ISO 13849-2:2012, Safety of machinery. Safety-related parts of control systems. Validation. This complements BS EN ISO 13849-1 and specifies the the procedures and conditions that should be followed to validate equipment safety and the safety-related parts of control systems. This requires analysis and testing of the safety functions provided, based on the designer's rationale.
BS EN ISO 13849-2 first looks at the validation process, covering the validation principles, generic fault lists, and validation plans and records. It then explains validation by analysis, testing, and safety devices and measures, while considering environmental and maintenance requirements.
It is important to start the analysis as early as possible within, and in parallel with, the design process. Doing so enables problems to be corrected early while changes are still relatively easy and low-cost to implement.
BS EN ISO 13849-2 includes:
- Validation plans
- Generic fault lists
- Information for validation
- Analysis techniques
- Measurement accuracy
- Number of test samples
Useful annexes, which are informative only, also outline validation tools for mechanical systems, pneumatic systems, hydraulic systems and electrical systems, plus there is an example of validation of fault behaviour and diagnostic means.
BS EN ISO 13849-2:2012 replaces BS EN ISO 13849-2:2008 and is available as a hard copy or PDF from BSI priced £204 (or £102 for members of BSI).