(You can't purge any object that is still 'in use'.) Only after a block definition has been purged, will ACAD actually go fetch the new, edited block you made.Īnd that's the beauty of the Swap/Update Block does all this for you in one single dialog box. The PURGE command will remove block definitions from a drawing, IF all existing instances have been erased. This is a time-saving and computer-resource saving measure it's faster and uses less processing power than actually going to an external file somewhere and copying the information all over again. Later, when you need to insert that block again, ACAD will use this already-existing copied information, which is called a 'block definition'. To expand slightly on jtoverka's (correct) reply, here's what is happening:Īny time you insert a block for the first time in ACAD-based software, there's something that happens in the background: the software makes a copy of that block and stores it in its internal drawing database. It will replace all existing instances of a block with the new, edited version (or an entirely different block, if that's what you need). AutoCAD Electrical has a special tool for this, Swap/Update Block.
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