What this card actually is
The ABB 3ADT220002R0023 is a drive memory module, not a generic PLC I/O slice. The listing title reads DRIVE MEMORY MODULE by ASEA BROWN BOVERI; the part number is 3ADT220002R0023. At 0.06 kg the part is a plug-in card, not a chassis — a single tech can swap it cold with no lifting plan, which is the right frame of reference when a line is down and the panel is on the shop floor rather than in a clean room.
Where the class is used and why the descriptor matters
Drive memory modules in this ABB family typically carry parameter sets, firmware images, or application macros read on power-up. A buyer sourcing this code is usually replacing a failed card on an installed drive, not adding new I/O to a PLC rack. Practical consequence: if the failed card was pulled because the drive throws a memory-mismatch fault at boot, the 3ADT220002R0023 order code is what the drive expects to handshake with — quoting the generic expansion-module catalog position will not tell you whether it is the right firmware revision for the host drive.