Field note: Omron E3S-AR81-2M
The Omron E3S-AR81-2M is a photoelectric sensor from the E3S series, shipped with a 2-meter pre-wired cable — the '2M' suffix confirms the cable length. No output type or sensing range is listed in these specs — verify the existing sensor's label before swapping to avoid signal mismatch. In a noisy plant, assume the cable shield needs a solid bond at the controller end; floating the shield invites phantom triggers.