B
Bouchard, James [CPCCA]
My experience has been that trying to leave free wire numbers, inputs outputs pages or just about anything else eventually breaks down and you
have to go out of sequence. As a result I do not try to keep things grouped. Our machines have from 100 to 1000 digital I/O and a lot of hard wired safety circuits ( a large machine can have over 100 guard switches ) We also make changes, often significant and major, on a regular basis as often as yearly so a grouping scheme can soon break down.
I have avoided wire numbers based on line numbers because we add and subtract sheets and move things around which messes up an line number based
system ( we base our line numbers on the sheet at the first 3 digits ) Also it becomes difficult to assign numbers if you have wires that appear on
several pages. This is a problem with European manufacturers as then create a lot of sheets with very little on them. I have schematics that are 450 sheets long as a result and a wire can easily cover a half a dozen pages.
James Bouchard
have to go out of sequence. As a result I do not try to keep things grouped. Our machines have from 100 to 1000 digital I/O and a lot of hard wired safety circuits ( a large machine can have over 100 guard switches ) We also make changes, often significant and major, on a regular basis as often as yearly so a grouping scheme can soon break down.
I have avoided wire numbers based on line numbers because we add and subtract sheets and move things around which messes up an line number based
system ( we base our line numbers on the sheet at the first 3 digits ) Also it becomes difficult to assign numbers if you have wires that appear on
several pages. This is a problem with European manufacturers as then create a lot of sheets with very little on them. I have schematics that are 450 sheets long as a result and a wire can easily cover a half a dozen pages.
James Bouchard