Sibling check: E2S-W23 3M
The E2S-W23 3M shares the same plastic module, supply range, and IP67 rating but differs in two decisions: sensing distance is 2.5 mm versus 1.6 mm, and the output is NPN-NO three-wire (separate supply, ground, and load line) with cable leads instead of a connector. If your panel is wired for three-wire proximity sensors, dropping in the E2S-Q11B 1M means repowering the sensor from the input card's sensor supply and running the load wire through the return. Not a complicated swap, but not a direct terminal-for-terminal replacement. For a new BOM line, choosing between them comes down to wiring preference and range headroom. The 1.6 mm sensor suits flush-mount applications where target proximity is tightly controlled; the 2.5 mm gives extra tolerance against vibration.