FANUC Fundamentals of CNC Robotics Operation 5

Question 1

What is the FANUC macro instruction $SHELL_CMD used for in advanced programming?

Accepted Answer

Executing operating system shell commands from within a Karel program

Answer

$SHELL_CMD allows Karel programs to invoke system-level OS commands on the robot controller.

Question 2

Which joint configuration setting prevents a FANUC robot from flipping its wrist during continuous linear motion?

Accepted Answer

SINGULARITY AVOIDANCE enable in motion setup

Answer

Enabling singularity avoidance allows the controller to deviate slightly from the programmed path to prevent J5 near-zero wrist flip.

Question 3

On the FANUC R-30iB+ controller, what does the STATUS indicator light flashing amber (yellow) signify?

Accepted Answer

A non-fatal alarm is active but the robot can still run

Answer

A flashing amber STATUS light indicates a warning-level alarm that does not prevent motion but should be investigated.

Question 4

What is the correct sequence to perform a cold start on a FANUC robot controller?

Accepted Answer

Cycle power while holding PREV + NEXT on the teach pendant

Answer

Holding PREV + NEXT during controller power-up forces a controlled cold start that clears runtime state.

Question 5

Which FANUC feature allows a robot program to be automatically selected and started by an external PLC signal?

Accepted Answer

Program Select (RSR or PNS)

Answer

RSR (Robot Service Request) and PNS (Program Number Select) allow external devices to select and start TP programs via I/O.

(FANUC) Fuji Automatic Numerical Control Robotics Certification Practice Test