FANUC Fundamentals of CNC Robotics Operation 2 — Questions and Answers
Question 1: Which FANUC robot axis is responsible for the rotation of the wrist roll?
- J4
- J5
- J6 (Correct answer)
- J3
Correct answer: J6
J6 controls wrist roll rotation, allowing the end-of-arm tooling to spin about the tool centerpoint.
Question 2: What does the FANUC system variable $PARAM_GROUP[ ].$PAYLOAD represent?
- The TCP offset distance
- The maximum tool load in kilograms (Correct answer)
- The joint speed override limit
- The robot's serial number
Correct answer: The maximum tool load in kilograms
$PAYLOAD stores the maximum allowable tool payload in kilograms for the motion group.
Question 3: In FANUC Karel, which statement is used to pause program execution for a specified number of seconds?
- DELAY (Correct answer)
- WAIT
- HOLD
- PAUSE
Correct answer: DELAY
The DELAY statement in Karel halts execution for a defined duration before continuing.
Question 4: What is the purpose of the FANUC DCS (Dual Check Safety) function?
- To synchronize two robots in a shared workspace
- To provide hardware-level position and speed monitoring independent of the main CPU (Correct answer)
- To duplicate CNC G-code across two controllers
- To back up the robot program to a secondary drive
Correct answer: To provide hardware-level position and speed monitoring independent of the main CPU
DCS monitors joint positions and speeds on a dedicated safety CPU, triggering a stop if limits are violated.
Question 5: Which coordinate frame is fixed to the robot's end-of-arm tooling and moves with it?
- World frame
- Joint frame
- Tool frame (Correct answer)
- User frame
Correct answer: Tool frame
The tool frame (TCP) is defined relative to the robot flange and translates/rotates with the tool.
Question 6: On a FANUC teach pendant, pressing SHIFT + RESET performs which action?
- Clears the current program
- Releases a fault and resets alarms (Correct answer)
- Resets the coordinate system to World
- Powers off the controller
Correct answer: Releases a fault and resets alarms
SHIFT + RESET clears active faults and alarm conditions so normal operation can resume.
Question 7: What is the function of the FANUC background logic (BG Logic) feature?
- Runs Karel programs that execute concurrently with the main motion task (Correct answer)
- Handles only I/O monitoring while the robot is idle
- Provides a secondary TP program editor
- Controls servo amplifier tuning parameters
Correct answer: Runs Karel programs that execute concurrently with the main motion task
BG Logic allows Karel programs to run as background tasks simultaneously with foreground motion programs.
FANUC Fundamentals of CNC Robotics Operation 2
Which FANUC robot axis is responsible for the rotation of the wrist roll?