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Writing Your First Safety Routine: Standard Tags, Safety Tags, and the Mapping Between Them

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Three boxes across the top showing which way data crosses: Standard task on the left holding standard controller tags, standard program tags and the note that HMI and MSG write here; Safety tag mapping in the middle, reached from Logic then Map Safety Tags, one standard tag to one safety tag copied at task start; Safety task on the right holding safety controller tags and safety program tags written only by safety logic. A return path along the bottom is labelled that standard routines read controller-scoped safety tags directly with no mapping needed. Below, a panel listing the five rules that decide whether a mapping pair is legal and the five states in which mapping is refused outright

Writing Your First Safety Routine: Standard Tags, Safety Tags, and the Mapping Between Them Put a standard BOOL on a rung inside a safety routine and Studio 5000 will not accept it; the browse list does not even offer the tag. Try the obvious workaround next and the software refuses that too, because you cannot … Read more

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