What you're actually ordering
The ABB ACS580-01-206A-4+B056 belongs to the ACS580 series, with the +B056 option appended to the base ACS580-01-206A-4 order code. It sits in the Motor Drives subcategory under Drives, a wall-mount form factor intended for cabinet integration rather than field mounting. Unit weight is 54.43 kgs — this is a two-person lift and the cabinet has to be rated for that mass at the planned mounting height before the drive goes in.
Sizing context inside the ACS580-01 frame string
In the ACS580-01 family, peer ACS580-01-180A-4 also weighs 54.43 kgs per record, so chassis mass matches while the current frame differs.
What +B056 typically changes
The +B056 suffix on an ACS580-01 base code is a factory option bundle — it is part of the order string, not a field-installed add-on, so the option must be specified at the time of quote to land on the BOM correctly.