Cross Reference For Variables, Channels, Etc.

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A sorted list of all variables, channels, etc., with a list of all the locations where they're referenced and how (destructive vs. non-destructive, sequence (name, line, character position), page (component type, component name for that component if named, x and y position on page, etc).

This is standard with PLC's. Not uncommon with HMI's but the concept is a little more abstract so you don't always see it, but VERY VERY useful.

Here's a screenshot of the one Allen-Bradley generates in the programming software for the SLC-5/00:

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