This message means that a signal was processed that did not end up being fed anywhere.
The usual circumstance is that an IREF is used to bring a visual line from an external diagram to what looks like an input on a FC 27 AI or a FC 43 DI block. There is actually no input for these blocks, so the message may be ignored in these cases.
Sometimes, a line is left attached to a source that is no longer used. Deleting the line will eliminate the message.
This message could also be saying that a signal has no connection at the coordinates shown.
These messages are often cosmetic. They may tell you that a signal is brought out from the named IREFs but not used. This shows up if people delete logic without deleting the IREFs that feed it.
--Scanning drawing 2010402A.CAD Live wire from IREF (29A-TE-1218A-TU) does not connect to anything - (2245,2560) (1925,2560). Live wire from IREF (29A-TE-1315A-TU) does not connect to anything - (2520,2360) (1920,2360).
This error can be built directly into Hyperview. For more information, see the article Building error reports into the M14.