The FANUC DCS Position/Speed check features need additional external sensors to monitor speed and position.

• A. True
• B. Depends on firmware version
• C. Only for high-precision cells
• D. False

Answer: (D)

Speed and position checks in FANUC DCS use the servo system’s built-in encoder feedback to verify actual motion against commanded motion. Because this monitoring relies on internal feedback, no additional external sensors are required to perform the checks. External sensors would only be needed if you were measuring something outside the servo axis or adding redundancy, not for the DCS speed/position verification itself. Firmware versions can affect what features are available, but the need for external sensors to monitor speed and position for these checks is not correct.