UNE-EN 61069-7:2016

This part of IEC 61069:

specifies the detailed method of the assessment of system safety of a basic control system (BCS) based on the basic concepts of IEC 61069-1 and methodology of IEC 61069-2,

defines basic categorization of system safety,

describes the factors that influence system safety and which need to be taken into account when evaluating system safety, and

provides guidance in selecting techniques from a set of options (with references) for evaluating the system safety.

The treatment of safety in this standard is confined to hazards that can be present within the BCS itself. That is, the BCS itself as a physical entity will not impose a hazard.

Considerations of hazards that can be introduced by the process or equipment under control, of the BCS to be assessed, are excluded.

Where the BCS risk reduction is intended to be less than 10 (i.e. SIL< 1, per IEC 61508), then assessment comes under this standard.

Any control system providing safety instrumented functions claiming a risk reduction factor of 10 or more (i.e. SILe" 1, per IEC 61508), is not in the scope of this standard.

NOTE If the system mission includes activities, which could affect the safety of the process or equipment under control, the requirements of these activities are the subject of IEC 61508 and/or other application specific standards e.g. IEC 61511.

This Part of IEC 61069 is intended for the users and manufacturers of systems, and also for those who are responsible for carrying out assessments as an independent party.