August 2000

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HP Automation Safety: Separation – control and safety

There are many questions in the minds of engineers working to meet new safety standards like ANSI/ISA S84.01 and IEC 61508. One question that I have heard quite a bit lately relates to ..

Goble, W., exida LLC

There are many questions in the minds of engineers working to meet new safety standards like ANSI/ISA S84.01 and IEC 61508. One question that I have heard quite a bit lately relates to the issue of separating controllers used for safety and control. It has long been the practice of many companies to keep controllers used for safety protection completely independent of those used for automatic control and optimization. Two completely different systems are required. Some companies even go so far as to require different manufacturers. This design rule is being challenged. Some say it is due to the old customs of the '60s an

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