A customer called this week and asked what our SIL rating is on one of our products (Programmable Logic Controller). I had never heard of a SIL rating. I went to the web and discovered SIL stands for Safety Integrity Level and is addressed in IEC61508. My impression, from the web search, is that a SIL analysis would be accomplished on a large manufacturing process and the outcome would be based on the attributes of all of the components of the process, i.e.. sensors, controllers, output devices. I haven't seen anything on the web that indicates the individual components have a SIL rating. Does anyone have any experience with either SIL ratings or IEC61508 who might be able to shed some light? Dan Kinney Lead Qualification Engineer Horner APG, LLC Indianapolis, IN
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