What it is and where it sits
The Omron E3F2-DS10B4-N 2M is an M18-barrel retro-reflective photoelectric switch sensor built for short-range object or limit detection on industrial equipment. Light-ON or Dark-ON is selected by wiring, so the same SKU drops into both sourcing and sinking reflector logic without a model swap.
What the ratings decide on the floor
100 mm sensing range fits short-throw detection on conveyors, indexing tables, and small-part presence checks — close enough that reflector alignment is forgiving in tight machine frames. Response time of 2.5 ms max is fine for general line-speed part detection; for high-speed indexing or rotary registration the wireman should confirm PLC scan time plus this 2.5 ms won't bottleneck the cam. IP67 with a stainless steel and plastic housing handles washdown and oily cell environments — derating of the ambient envelope is bounded at -25 … 55 °C, so cold-room and engine-near installs stay inside the rating without heater accessories.
Sourcing posture
Lifecycle stage is recorded as current, with no official LTB, PCN, or successor code in the record — the part is sourced against the BOM rather than as a clearance buy. Pre-wired with a 2 m pigtail out of the box, so panel layout doesn't need a separate connector or cordset BOM line.