Reading the suffix stack
The ACS800-104-0580-7+C126+E205+V991: A buyer chasing this exact code is not buying a generic ACS800-104 frame — the +C126, +E205 and +V991 designators specify a particular ABB factory build on top of the base ACS800-104-0580-7 inverter. Nameplate traceability matters here: the PO line, the packing list, and the drive's own type designation label have to read the same suffix chain, otherwise the configured options and the firmware the unit was shipped with will not match the BOM. For quality / doc control this is the comparison point — anything short of the full string is the wrong part for the line.