What it is, what it slots into
The Omron NX1W-MAB221 is an analogue input option module that drops onto a Sysmac NX Series PLC, sitting as an expansion slice to the controller rather than a standalone card. The unit measures 36 mm wide by 36 mm tall by 28 mm long, which matches the standard NX option-board footprint and lets it share a slot row with other NX1W slices without trimming the DIN layout. Termination is via a plug connector and the housing is plastic, so field wiring is quick-disconnect rather than hard-wired; swap-out on a live panel stays a screwdriver-light job.
Operating envelope
Operating temperature runs from 0 °C to 55 °C, which is the standard NX option-board ambient and sets the cabinet ventilation budget for any sealed enclosure. Because the slice is plastic-housed and plug-terminated, derating against the 55 °C ceiling is set by Omron's standard NX thermal curve rather than by a separate heat-sink spec for this part.
Not a drop-in for DAB21V
The NX1W-CIF11 shares the 36 mm by 36 mm by 28 mm option-board footprint but is a communication expansion board for RS-485/RS-422, not an analogue I/O slice, so it sits next to an MAB221 rather than in place of it.
For a stocked spare or a panel build, the order code is the one to specify against the BOM and quote to order through an RFQ; the shared NX1W footprint means any standard NX option-board row in the cabinet will accept it without mechanical rework.