If a robot is moving to a previously recorded position and the controller does not know one axis position, what can be guaranteed?

• A. It can still move accurately
• B. It cannot guarantee accurate movement
• C. It ignores the axis
• D. It uses a default 0 position

Answer: (B)

The main idea is that reproducing a recorded position requires knowing the exact state of every axis. If one axis position is unknown, the controller cannot determine how far that axis must move to reach the target, so it cannot guarantee that the robot will end up at the recorded position. The missing information creates uncertainty in the final pose, making accurate and repeatable movement impossible.

Even though the other axes can be commanded, the unknown axis means the overall position could be off. Therefore, accuracy cannot be guaranteed. Using a default position or ignoring the axis would not fix this; they would still fail to reproduce the precise pose.