The OD2-N30W04A0 is a 2D Laser Displacement Sensor from the OD Value series, chassis-mounted and terminated via connector. It runs on a 12~24VDC supply and outputs an NPN signal, with a measurement window of 26.0mm to 34.0mm installation distance — that 8mm band is where the sensor's laser line reads profile height.
The closest sibling is the OD2-N30W04C0 — same 2D laser displacement sensor, same OD Value series, same chassis mount, same 12~24VDC supply, same IP67, same 26.0~34.0mm installation distance. The difference is in the output: the A0 variant is NPN; the C0 variant is PNP. If your PLC input card expects sourcing (PNP), the C0 is the drop-in swap. If you're already wired for sinking (NPN), the A0 is the one. No rewiring needed beyond the output type — same connector, same footprint.
Mounts to a chassis or bracket — no DIN rail, so plan a rigid mount that holds the 26.0~34.0mm standoff steady. The connector termination means you'll need a mating cable assembly; verify the pinout against the NPN output before crimping. Operating temperature range is -10°C to 40°C, so keep it out of direct oven exhaust or freezing warehouse aisles.