Machine-guard interlocks used to be defeated by taping a magnet over the sensor. Coded-magnet interlocks ended that — the sensor answers only to its matching coded actuator. It is the clearest shipping case of magnetic identity as a safety feature.
Manufacturing adopted engineered magnetics wherever the workpiece is steel and the constraint is time: clamping, fixturing, mold change, sheet handling. The coded generation adds two things the plant floor actually wants — identity (interlocks, poka-yoke) and force profiles (hold here, release exactly so).
Guard-door interlocks from IDEM and peers use magnetically coded actuator/sensor pairs: the guard reads closed only when its specific coded partner is present, defeating the classic tape-a-magnet bypass. A regulated, certified, shipping product category (coding concepts trace to patent US 4,629,131).
Why coded · Identity is the behavior: matched code = signal; any other magnet = nothing.
Magnetic clamping plates turn press and injection-mold changeovers from hours of bolting into minutes — full-face clamping with zero standby energy [changeover figures are vendor-cited].
Switchable-magnet fixturing (Magswitch and peers) — grounds that clamp anywhere on the workpiece, fixtures that reposition in seconds.
Parts that physically refuse wrong assembly: the bracket only seats on its coded mate; the wrong-handed variant is rejected by physics before a human can err. Keyed pairs are purchasable today; a documented production-line deployment is not public.
Why coded · Poka-yoke by force function — the error-proofing is printed into the part.
Fine-pattern magnets grip the top sheet of a steel stack hard while barely reaching the sheet below — the short-field “flaw” used as a picker’s feature. Vendor-described; independent deployment unconfirmed.
Why coded · The exponential decay that limits reach becomes single-sheet selectivity.