What lands on the panel
The ABB 3ADT200061R0001 is a digital I/O extension in the PLC Expansion Modules class — the kind of slice that hangs off an existing rack when the base controller has run out of points and the cabinet real estate is already spoken for. It is an ABB line item, not a third-party sled, which matters when the rest of the rack is ABB-native and the I/O map has to be coherent in the engineering tool. The only quantitative handle the listing gives a planner is mass: 0.09 kg. That is light enough that a single tech can swap it in a live cabinet without planning a second pair of hands, and small enough in the BOM that the panel-fill calculation barely moves. It is not the figure that decides the fit, though — the fit is decided by whether the module addresses as the right expansion slice in the rack configuration.
Where the class earns its keep
A digital I/O extension in this category sits in the PLC Expansion Modules class under the PLCs and Accessories parent. It is addressed as a node on the existing rack, adding digital in and out channels that the base controller and the HMI tag database absorb without a program rewrite. In a wastewater or lift-station retrofit, that is usually the difference between a clean expansion and a weekend of rewiring — drop the extension on the rack, re-scan the I/O, and the SCADA picks it up. The constraint is always the engineering tool version and the controller firmware: the extension only shows up cleanly if the host is on a revision the tool can describe.
Sourcing posture
For a part that lives in PLC expansion slots, the procurement question is rarely whether to buy — it is whether the slot in the panel was originally designed around this exact code or a successor, and whether the firmware line will still recognise what shows up in the box. The 3ADT200061R0001 is specified into the BOM on its own terms, and orders are quoted against an RFQ rather than pulled from a generic shelf list.
Same-class siblings worth a look
The closest same-class siblings are 3BSE045584R1 and 3BSE037760R1, both PLC Expansion Modules listed at 0.09 kg. A heavier alternative sits at 3BSE030192R1 at 0.12 kg. Interchange decisions belong to the engineering tool and the I/O map, not the weight column.