CIM Motor Reversing

They are non-contacting sensors, so less susceptible to mechanical damage. They can be easier to coordinate with hard stop protection also. However, they do require repeatable clearance from sensor to target at the desired switch point, so their function will change if the arm or frame is distorted.

Generally, a stronger target magnet makes the Hall sensor less susceptible to switch point shifting when clearances change slightly. Sensor manufacturers usually provide details (sensitivity curves, operate/release magnetic field levels, etc.) in their data sheets and application notes.

Or the limit switch contact closes. Milliseconds later, the arm crushes the limit switch. Another few milliseconds later, the switch contacts open again, never to close again, and the mechanism with over 400 ft.-lb. of torque procedes to destroy itself…