CMS Automation & Industrial Robotics 2 — Questions and Answers
Question 1: Which robot configuration uses three rotary joints to provide the greatest freedom of movement and is most commonly used in assembly and welding applications?
- Cartesian
- SCARA
- Articulated (Correct answer)
- Delta
Correct answer: Articulated
Articulated robots use three or more rotary joints, mimicking a human arm, giving them the greatest range of motion for complex tasks like welding and assembly.
Question 2: In a Programmable Logic Controller (PLC), what is the primary function of the input/output (I/O) module?
- Executes the ladder logic program
- Interfaces sensors and actuators with the CPU (Correct answer)
- Stores the user program in non-volatile memory
- Provides power regulation to all PLC components
Correct answer: Interfaces sensors and actuators with the CPU
The I/O module serves as the interface between field devices (sensors, actuators) and the PLC CPU, converting real-world signals to digital data.
Question 3: What type of sensor uses the Hall effect to detect the position of a magnetic target without physical contact?
- Inductive proximity sensor
- Capacitive proximity sensor
- Magnetic proximity sensor (Correct answer)
- Photoelectric sensor
Correct answer: Magnetic proximity sensor
Magnetic proximity sensors exploit the Hall effect, generating a voltage when exposed to a magnetic field, enabling non-contact position detection.
Question 4: A manufacturing cell uses a robot with a repeatability specification of ±0.05 mm. What does this value represent?
- The maximum distance the robot can reach from its base
- The robot's ability to return to a previously taught position consistently (Correct answer)
- The maximum payload the end-effector can carry
- The tolerance of the robot's absolute positional accuracy
Correct answer: The robot's ability to return to a previously taught position consistently
Repeatability measures how consistently a robot can return to the same programmed point, not its absolute accuracy relative to a coordinate system.
Question 5: Which communication protocol is commonly used in industrial automation to connect field devices such as sensors and actuators to a PLC over a single cable?
- Ethernet/IP
- PROFIBUS
- Modbus TCP
- DeviceNet (Correct answer)
Correct answer: DeviceNet
DeviceNet is a fieldbus protocol designed to connect low-level industrial devices like sensors and actuators to controllers over a single cable network.
Question 6: In servo drive systems, what is the role of the encoder mounted on the motor shaft?
- Converts AC power to DC for the motor windings
- Provides position and velocity feedback to the controller (Correct answer)
- Limits the maximum current drawn by the motor
- Generates the PWM signal for motor speed control
Correct answer: Provides position and velocity feedback to the controller
The encoder generates pulses proportional to shaft rotation, feeding position and velocity data back to the servo controller for closed-loop control.
Question 7: What is the primary purpose of a teach pendant in industrial robotics?
- Monitoring robot health and performing predictive maintenance
- Manually guiding and programming robot positions and movements (Correct answer)
- Running simulation software to test programs offline
- Interfacing the robot controller with enterprise MES systems
Correct answer: Manually guiding and programming robot positions and movements
A teach pendant is a handheld device used by operators to manually jog the robot, teach positions, and write or edit programs directly on the robot controller.
CMS Automation & Industrial Robotics 2
Which robot configuration uses three rotary joints to provide the greatest freedom of movement and is most commonly used in assembly and welding applications?