Safety Critical Systems Development

NeST has capability in developing Safety Critical Systems and has executed projects/products for various sectors including Power, Consumer and Defence.

These products have passed conformance to IEC 61508 SIL3 and automotive standard ISO /DIS 26262. The skills include arriving at a Product specification, Hardware and Software development in conformance with safety critical standards, FMEA, Testing and Mechanical enclosures complying with the safety needs.

Product compliance testing with the certifying agency shall also be done by NeST depending on the customer requirement.

The basic workflow adopted at NeST for the Product Development is as shown below.

The requirements analysis results in a Master List of Requirements which provides a single point of reference for all the product level requirements and the starting point for the Product Specification and the Hardware and Software specifications.

Based on the Product Specification, a detailed Product FMEA is done which analyzes all the possible failure modes for the product and the response or recovery actions for each of these failures are defined. These include the various self recovery options in software and failure identification options by way of feedback in the hardware. The complexity of the safety aspects considered in the implementation is decided by the Safety Integrity Level (SIL) to be satisfied by the product.

The basic workflow adopted at NeST for the Hardware Development is as shown below.

The basic workflow adopted at NeST for the Software development is as shown below.

The major activities followed for software from the start up of the project till completion is listed below.

Each testing phase includes preparation of Test Plan, Test Case and Test Results.

The figure below shows the steps followed for the preparation of Architecture Design document.

Typical Safety Critical Product Development Life Cycle