A number of requirements in the International Functional Safety Standard IEC 61508 sound as if an operating company must set up a safety instrumented system (SIS) to automatically trip the process whe..
A number of requirements in the International Functional Safety Standard IEC 61508 sound as if an operating company must set up a safety instrumented system (SIS) to automatically trip the process whenever a diagnostic fault alarm occurs. Many read this standard and think - no way! However, the diagnostic fault alarm does imply that the SIS is no longer capable of providing automatic protection. There is logic in thinking that the process should be shut down on such an indication. However, many do not set up their SIS that way. Why not? Are they wrong? When should "automatic shutdown" be used?
The red light on the dashboard of my car came on this week indicating that there is a problem wit
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