Axis limit hard stops are best described as what?

• A. Electronic signals inside the controller
• B. Software tolerances
• C. Visual indicators only
• D. Physical barriers

Answer: (D)

Axis limit hard stops are physical barriers that stop motion where the axis has reached the end of its allowed travel. They are solid mechanical obstacles built into the machine, sometimes accompanied by switches to detect contact, but the stopping action comes from the hardware itself. This is different from electronic signals inside the controller (which are ways the system knows a limit was reached but do not provide the actual barrier), software tolerances (virtual limits enforced by the control software), or visual indicators (which merely show where the limit is without physically stopping motion).