In this two-part article, the challenges of migrating legacy safety systems are reviewed, along with the means of repeatedly and effectively executing compliant migrations. Part 2 reviews the tools-assisted process and further explores how to achieve the required compliance, quality, efficiency and rigor.
In this two-part article, the challenges of migrating legacy safety systems are reviewed, along with the means of repeatedly and effectively executing compliant migrations.
In Part 1 (Hydrocarbon Processing, November), the requirements for safety system migrations within International Electrotechnical Commission (IEC) 61508 and IEC 61511 were reviewed. It was concluded that, for safety-related software, it is impracticable to take credit for pre-existing software elements developed for an operating system different than the target system.
The effort involved in making the safety case is disproportionate to the effort required for creating a new application. Therefore, a more practical appr
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