In general, IEC 62443 is quite well-written, especially if you compare it to (older) safety standards. But I’ve been wrestling with some of the terminology for months now. Most of these questions might have been answered quickly if I had access to a TC 65X member telling me about the committee’s intentions and current plans, but I don’t, so I’m doing textual exegesis. Let me sketch out my questions about four different terms in the published version from 2019, and how the current drafts for t...
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