What a buyer should pin down before the PO closes
The -01-124A-4 suffix is the only thing that fixes the drive to a specific current frame and option set; the surrounding order code (control panel variant, brake chopper, fieldbus adapter) is what determines whether the replacement walks into a wired cabinet without adapter rework. Buyers carrying a panel originally specified around a +B055 or +L512 option code need to read the original purchase order line in full, not just the base MPN, because the option letters are what decide fieldbus card fitment and keypad type — not the drive's current rating. Compliance paperwork — declarations, nameplate data, CE/UL marks — has to be requested against the specific serial-number range being shipped, not against the part number in the abstract, because the same -01-124A-4 suffix has shipped across multiple firmware revisions and the declaration of conformity is keyed to the build, not the code. A request to the supplier for the declaration pack tied to the actual shipping lot is what closes that loop for an audit trail.