CMS Automation & Industrial Robotics 3 — Questions and Answers
Question 1: Which type of automated guided vehicle (AGV) navigation uses magnetic tape or wire embedded in the floor to follow a predetermined path?
- Laser triangulation navigation
- Natural feature navigation
- Fixed-path guidance (Correct answer)
- Inertial navigation
Correct answer: Fixed-path guidance
Fixed-path guidance AGVs follow physical guides like magnetic tape, wires, or painted lines, making them reliable but inflexible to path changes.
Question 2: In machine vision systems used for quality inspection, what is the function of a backlighting setup?
- Enhances surface texture details for defect detection
- Creates a high-contrast silhouette to measure part dimensions (Correct answer)
- Eliminates shadows to reveal color variations
- Increases depth-of-field for three-dimensional inspection
Correct answer: Creates a high-contrast silhouette to measure part dimensions
Backlighting illuminates from behind the part, creating a dark silhouette against a bright background, ideal for dimensional measurement and profile inspection.
Question 3: A robot work cell is designed with a light curtain at its entry point. Under IEC 62061, what category of safety function does this typically represent?
- An administrative safety control
- A safety-rated monitored stop function
- A presence-sensing safeguarding device (Correct answer)
- An enabling device
Correct answer: A presence-sensing safeguarding device
Light curtains are classified as presence-sensing safeguarding devices that detect intrusion into a hazardous zone and trigger a safe stop.
Question 4: What does the term 'degrees of freedom' (DOF) refer to when describing an industrial robot?
- The number of different programs that can be stored in the controller
- The maximum number of axes or independent motions the robot can perform (Correct answer)
- The range of payload weights the robot is certified to handle
- The number of I/O points available on the robot controller
Correct answer: The maximum number of axes or independent motions the robot can perform
Degrees of freedom refers to the number of independent axes of motion a robot possesses, with most industrial robots having 6 DOF for full spatial manipulation.
Question 5: In pneumatic automation systems, what is the primary function of a Festo-style 5/2 directional control valve?
- Regulates downstream pressure to a set point
- Directs airflow to extend or retract a double-acting cylinder (Correct answer)
- Filters moisture and particulates from compressed air
- Converts electrical signals into proportional flow rates
Correct answer: Directs airflow to extend or retract a double-acting cylinder
A 5/2 valve has 5 ports and 2 positions, routing compressed air to either side of a double-acting cylinder while exhausting the other side.
Question 6: Which programming language for PLCs uses graphical symbols resembling electrical relay logic diagrams?
- Structured Text (ST)
- Function Block Diagram (FBD)
- Ladder Diagram (LD) (Correct answer)
- Sequential Function Chart (SFC)
Correct answer: Ladder Diagram (LD)
Ladder Diagram uses graphical symbols (contacts and coils) that resemble electrical relay diagrams, making it intuitive for electricians transitioning to PLC programming.
Question 7: A collaborative robot (cobot) is rated for 'power and force limiting' operation. According to ISO/TS 15066, what is the primary protection mechanism?
- Physical guards that prevent all human entry into the work envelope
- Speed and separation monitoring via safety-rated scanners
- Limiting the robot's output force and power to safe biomechanical thresholds (Correct answer)
- Emergency stop buttons located at every 2 meters around the cell
Correct answer: Limiting the robot's output force and power to safe biomechanical thresholds
Power and force limiting (PFL) cobots comply with biomechanical limits defined in ISO/TS 15066, restricting contact forces to levels that prevent injury.
CMS Automation & Industrial Robotics 3
Which type of automated guided vehicle (AGV) navigation uses magnetic tape or wire embedded in the floor to follow a predetermined path?