2025 question paper

Robotic Programming and Software Development

17 questions

Q1. Choose the correct option/answer the following (Any seven question only): (a) Which component manages the communication and processing tasks within a robot system? (b) The main workspace structure in ROS where packages are built is known as: (c) Lead through programming is primarily associated with: (d) Which sensor is commonly used for mapping and localization in autonomous navigation? (e) In VAL-I/II programming, what are conditional statements used for? (f) Which of the following is responsible for facilitating inter-process communication between different parts of a ROS system? (g) A configuration where a robot's wrist joints align in such a way that the robot loses one or more degrees of freedom is called a: (h) In the RAPID programming language, a command block designed for a specific, simple, and frequent operation that is called upon by the main program is typically a: (i) The command used to synchronize the actions of two or more independent devices (e.g., a robot and a conveyor belt) is the: (j) The application of Computer Vision, AR & VR in Robotics, and Virtual robotics are all topics covered under the study of:202514m
MCQ
Choose the correct option/answer the following (Any seven question only): (a) Which component manages the communication and processing tasks within a robot system? (b) The main workspace structure in ROS where packages are built is known as: (c) Lead through programming is primarily associated with: (d) Which sensor is commonly used for mapping and localization in autonomous navigation? (e) In VAL-I/II programming, what are conditional statements used for? (f) Which of the following is responsible for facilitating inter-process communication between different parts of a ROS system? (g) A configuration where a robot's wrist joints align in such a way that the robot loses one or more degrees of freedom is called a: (h) In the RAPID programming language, a command block designed for a specific, simple, and frequent operation that is called upon by the main program is typically a: (i) The command used to synchronize the actions of two or more independent devices (e.g., a robot and a conveyor belt) is the: (j) The application of Computer Vision, AR & VR in Robotics, and Virtual robotics are all topics covered under the study of:

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Worked Solution
Solution: MCQs

Robot Controller — manages communication, processing and control tasks within the robot system.

Catkin Workspace — the main ROS workspace used to build ROS packages.

Teach pendant / similar device programming — lead-through programming records robot motions demonstrated by the operator.

LiDAR — commonly used for mapping and localization because it measures distances to surrounding objects.

Conditional statements — implement decision-making logic based on conditions or sensor inputs.

ROS Topics — provide asynchronous publish/subscribe communication between ROS nodes.

Singularity — a robot configuration in which one or more degrees of freedom become unavailable or poorly conditioned.

Subroutine — a reusable block of instructions called by another routine for a specific operation.

Interlock command — coordinates robot operation with other equipment such as conveyors.

Soft Robotics — the supplied syllabus places Computer Vision, AR/VR and Virtual Robotics in this module.

Final Answers

(a) Robot Controller
(b) Catkin Workspace
(c) Teach Pendant
(d) LiDAR
(e) Decision-making logic
(f) ROS Topics
(g) Singularity
(h) Subroutine
(i) Interlock command
(j) Soft Robotics

Q2(a). What are the types of coordinate system of robot? Explain with neat sketch.20257m

Robot Programming Fundamentals

What are the types of coordinate system of robot? Explain with neat sketch.

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Worked Solution

Solution: Types of Robot Coordinate Systems

A robot coordinate system defines how the position and orientation of the robot tool are represented and controlled.

1. Cartesian Coordinate System

Uses three mutually perpendicular linear axes: X, Y and Z.

The robot moves the tool along straight X, Y and Z directions. It is commonly used for Cartesian robots and precise linear movements.

2. Cylindrical Coordinate System

Uses:

radial motion $r$
rotational motion $\theta$
vertical motion $z$

       Z ↑
         |
         |  •
         | / 
         |/ r
        O────────→
          θ

It is suitable for robots performing cylindrical-workspace operations.

3. Spherical / Polar Coordinate System

Uses:

radial distance $r$
two angular coordinates
$\theta$ and $\phi$

The tool position is described relative to a fixed origin using distance and angles.

4. Joint / Articulated Coordinate System

Each robot joint is controlled according to its own joint variable, such as $\theta_1,\theta_2,\ldots$ .

Base → Joint 1 → Joint 2 → Joint 3 → Wrist → Tool
          θ1        θ2        θ3

This is natural for articulated industrial robots.

5. Tool Coordinate System

The origin is attached to the end-effector/tool. Movements are specified relative to the tool's own axes.

6. World / Base Coordinate System

A fixed coordinate frame attached to the robot base or workcell. It provides a common reference for robot motion and other objects.

Comparison

Coordinate system	Main variables	Typical use
Cartesian	X, Y, Z	Linear positioning
Cylindrical	$r,\theta,z$	Cylindrical workspace
Spherical	$r,\theta,\phi$	Radial/angular motion
Joint	Joint variables	Articulated robots
Tool	Tool-frame axes	End-effector motion
World/Base	Fixed reference axes	Workcell coordination

Conclusion

Different coordinate systems allow robot motion to be programmed conveniently for different applications. Industrial robot programming commonly uses joint, world/base and tool coordinates together.

Q2(b). Discuss the classification of End Effectors with neat sketches.20257m
End Effectors
Discuss the classification of End Effectors with neat sketches.

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Worked Solution
Solution: Classification of End Effectors

An end effector is a device mounted at the robot wrist that directly interacts with the workpiece or environment.

Classification

1. Grippers

Grippers hold, move and release objects.

Mechanical gripper: uses fingers/jaws.

Robot wrist │ ┌──┴──┐ │ │ / \ Finger Finger \ / [Object]

Types include:

Two-finger grippers

Three-finger grippers

Internal grippers

Angular/parallel grippers

2. Vacuum Grippers

Use suction cups and negative pressure to pick flat or smooth objects.

Robot wrist │ Vacuum line │ ┌───┐ │cup│ └─┬─┘ [Workpiece]

Applications include glass, sheets and electronic components.

3. Magnetic Grippers

Use permanent magnets or electromagnets to handle ferromagnetic materials such as steel components.

4. Welding End Effectors

Carry welding tools such as spot-welding guns or arc-welding torches.

Robot wrist → Welding gun → Workpiece ⚡

5. Spraying/Painting End Effectors

Use spray guns or nozzles for painting, coating and surface treatment.

6. Drilling and Machining Tools

Include drills, milling cutters, grinders and deburring tools for manufacturing operations.

7. Special-Purpose End Effectors

Designed for specific applications such as:

Surgical tools

Cutting tools

Adhesive dispensers

Polishing tools

3D-printing heads

Active and Passive End Effectors

Active: require energy or actuation, such as pneumatic/electric grippers and powered welding tools.

Passive: depend mainly on mechanical geometry or the workpiece interaction, such as simple hooks or fixtures.

Conclusion

The choice of end effector depends on workpiece shape, weight, material, required force, operation, accuracy and production environment.
Q3(a). Discuss the architecture of ROS and its use in modern robotics.20257m
ROS
Discuss the architecture of ROS and its use in modern robotics.

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Worked Solution
Solution: ROS Architecture and Its Use

Introduction

ROS (Robot Operating System) is a middleware and software framework used to develop robotic applications. It provides communication, tools, libraries, visualization and hardware integration rather than being a conventional operating system.

ROS Architecture

ROS Master / Discovery │ ┌─────────────┼─────────────┐ ↓ ↓ ↓ Node A Node B Node C (Camera) (Control) (Lidar) │ │ │ └──── Topics / Services / Actions ────┘ │ Robot Hardware

1. Nodes

A node is an executable process responsible for a particular function, such as sensor acquisition, localization or motor control.

2. Topics

Topics provide asynchronous publish/subscribe communication. A camera node can publish images while another node subscribes to them.

3. Services

Services provide request-response communication for operations that need a defined reply.

4. Actions

Actions are suitable for long-running tasks and provide feedback, status and the ability to cancel a goal.

5. Messages

Nodes exchange structured data using predefined or custom message types.

6. Packages and Catkin Workspace

ROS software is organized into packages. A Catkin workspace contains source packages and build/devel/install outputs in ROS 1 workflows.

Use in Modern Robotics

ROS is used for:

Robot control

Sensor integration

Autonomous navigation

SLAM and mapping

Computer vision

Manipulation

Simulation

Human-robot interaction

Multi-robot systems

Advantages

Modular architecture

Reusable software packages

Hardware abstraction

Standard communication mechanisms

Strong simulation and visualization ecosystem

Easy integration of sensors and algorithms

Conclusion

ROS enables complex robot systems to be divided into independent software components that communicate through standardized interfaces, making development, testing and maintenance easier.
Q3(b). Explain the steps involved in setting up a Catkin Workspace.20257m
ROS
Explain the steps involved in setting up a Catkin Workspace.

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Worked Solution
Solution: Setting Up a Catkin Workspace

A Catkin workspace is a directory structure used to organize and build ROS 1 packages.

Steps

1. Create the workspace

mkdir -p ~/catkin_ws/src cd ~/catkin_ws/src

The src directory contains ROS packages.

2. Initialize the workspace

From the workspace root:

cd ~/catkin_ws catkin_make

This creates build and devel directories and generates the required build configuration.

3. Source the workspace

source ~/catkin_ws/devel/setup.bash

This makes packages in the workspace available in the current terminal.

To source it automatically:

echo "source ~/catkin_ws/devel/setup.bash" >> ~/.bashrc source ~/.bashrc

4. Create a package

cd ~/catkin_ws/src catkin_create_pkg my_robot_pkg roscpp rospy std_msgs

The package now contains its manifest and build configuration.

5. Build the workspace

cd ~/catkin_ws catkin_make

6. Verify the package

rospack find my_robot_pkg

If the package path is returned, the workspace is correctly sourced.

Workspace Structure

catkin_ws/ ├── src/ │ └── my_robot_pkg/ │ ├── src/ │ ├── include/ │ ├── CMakeLists.txt │ └── package.xml ├── build/ └── devel/

Conclusion

The normal workflow is create workspace → initialize/build → source → create packages → build again → verify. This provides an organized environment for ROS development.

Q4(a). Differentiate between ROS Services and ROS Action.20257m

ROS

Differentiate between ROS Services and ROS Action.

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Worked Solution

Solution: ROS Services vs ROS Actions

Both ROS Services and Actions provide communication between ROS nodes, but they are designed for different kinds of tasks.

Feature	ROS Service	ROS Action
Communication	Request-response	Goal-feedback-result
Task type	Short operations	Long-running operations
Feedback	Normally no continuous feedback	Provides continuous feedback
Cancellation	Not designed for cancellation	Goal can be cancelled/preempted
Result	Returned after request	Final result returned separately
Example	Reset a sensor	Navigate to a destination

ROS Service

A service is synchronous request-response communication.

Client → Request → Service Server
Client ← Response ← Service Server

Examples include resetting a controller, requesting a calculation or changing a configuration parameter.

ROS Action

An action is intended for operations that may take significant time.

Client → Goal → Action Server
Client ← Feedback ← Action Server
Client ← Result ← Action Server
        ↑
      Cancel

For example, autonomous navigation may take several seconds or minutes. The client can receive distance/progress feedback and cancel the goal if necessary.

Conclusion

Use a Service for short request-response operations and an Action for long-running, feedback-producing and cancellable tasks.

Q4(b). Write a basic program using VAL-II programming to perform a pick-and-place operation, incorporating a conditional statement based on a sensor input.20257m
VAL-II
Write a basic program using VAL-II programming to perform a pick-and-place operation, incorporating a conditional statement based on a sensor input.

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Worked Solution
Solution: VAL-II Pick-and-Place with Sensor Condition

A pick-and-place program moves a workpiece from a pickup position to a placement position. A sensor can be used to verify that a part is available before starting.

Note: VAL-II syntax varies by controller implementation. The following is an exam-oriented illustrative program showing the required logic rather than a controller-specific production program.

Example

PROGRAM PICKPLACE MOVE PICK_APPROACH IF PART_SENSOR = ON THEN MOVE PICK CLOSE GRIPPER MOVE PICK_APPROACH MOVE PLACE_APPROACH MOVE PLACE OPEN GRIPPER MOVE PLACE_APPROACH ELSE STOP ENDIF END

Operation

Move to the pickup approach position.

Read the part-presence sensor.

If the sensor is ON, the robot moves to the pickup point.

The gripper closes and holds the workpiece.

The robot returns to the safe approach position.

It moves to the placement approach position.

It moves to the placement point and opens the gripper.

It returns to the safe position.

If the sensor is OFF, the program stops or waits for a part.

Flowchart

START ↓ Move to pickup approach ↓ Part sensor ON? ┌───────┴────────┐ NO YES ↓ ↓ STOP Pick part ↓ Close gripper ↓ Move to place ↓ Open gripper ↓ END

Importance of the Conditional Statement

The conditional statement prevents the robot from attempting to pick an absent part. It therefore improves automation reliability, safety and process control.
Q5(a). What is AML language? Explain the steps involved to handle constants and variables in AML programming.20257m
AML
What is AML language? Explain the steps involved to handle constants and variables in AML programming.

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Worked Solution
Solution: AML Language, Constants and Variables

What is AML?

AML (A Manufacturing Language) is a robot programming language developed for programming industrial robots. It provides commands for motion, sensing, program control, data handling and interaction with the robot controller.

Constants

A constant is a value that does not change during program execution. Constants can represent fixed numerical values, limits, speeds or configuration values.

Example concept:

SPEED = 50 MAX_COUNT = 10

The exact declaration syntax depends on the AML implementation/controller.

Variables

A variable stores a value that can change during program execution.

Examples include:

COUNT = 0 SENSOR = 1 POSITION = P1

Handling Variables

Declare/define the required variable.

Initialize it with a suitable starting value.

Read or modify the value during program execution.

Use the variable in conditions, calculations or motion commands.

Update it when the process changes.

Example Logic

COUNT = 0 IF SENSOR = ON THEN COUNT = COUNT + 1 ENDIF IF COUNT >= MAX_COUNT THEN STOP ENDIF

Here MAX_COUNT can be treated as a fixed limit, while COUNT changes as parts are detected.

Advantages

Makes programs easier to modify

Reduces repeated numerical values

Supports decision-making

Allows sensor and process data to be stored

Improves program readability and reusability

Conclusion

AML uses constants for fixed values and variables for changing values. Together they support motion control, sensing, calculations and program-control logic in industrial robot applications.
Q5(b). Explain the function, usage and application of LiDAR Sensors.20257m
Autonomous Navigation
Explain the function, usage and application of LiDAR Sensors.

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Worked Solution
Solution: LiDAR Sensors

Introduction

LiDAR (Light Detection and Ranging) is a sensing technology that measures distance by emitting laser light and measuring the time taken for reflected light to return.

Working Principle

Laser pulse → Object ↓ Reflected pulse ↓ LiDAR sensor ↓ Time measurement ↓ Distance calculation

Distance is approximately calculated as:

$d=\frac{c\Delta t}{2}$

where:

$d$ = distance to the object

$c$ = speed of light

$\Delta t$ = round-trip travel time

factor 2 accounts for outgoing and returning paths.

A scanning LiDAR rotates or electronically scans the beam to obtain measurements over many directions.

Functions

Distance measurement

Obstacle detection

Environment mapping

Localization support

Object detection and tracking

Usage in Autonomous Robots

LiDAR is commonly used with SLAM (Simultaneous Localization and Mapping). The robot compares LiDAR observations with its map to estimate its position while building or updating the environment map.

Applications

Autonomous mobile robots

Warehouse robots

Self-driving systems

Industrial AGVs/AMRs

Obstacle avoidance

2D/3D mapping

Building inspection

Surveying

Advantages

High distance-measurement accuracy

Works in low-light conditions

Provides dense spatial measurements

Useful for mapping and localization

Limitations

Higher cost than some simple sensors

Performance can be affected by highly reflective, transparent or absorbing surfaces

Moving parts may be present in mechanical scanning LiDAR

Outdoor operation can be affected by environmental conditions

Conclusion

LiDAR is an important sensor for autonomous navigation because it provides accurate geometric information about the surrounding environment for mapping, localization and obstacle avoidance.

Q6(a). Write the differences between Trajectory and Path. Explain any one path planning technique.20257m

Autonomous Navigation

Write the differences between Trajectory and Path. Explain any one path planning technique.

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Worked Solution

Solution: Path vs Trajectory and Path Planning

Path

A path is the geometric route followed by the robot from an initial position to a goal position. It specifies where the robot should go but does not necessarily specify the time required to reach each point.

Trajectory

A trajectory is a time-parameterized path. It specifies both position and how that position changes with time, including velocity and often acceleration.

Feature	Path	Trajectory
Describes	Geometric route	Route + time evolution
Time included	No	Yes
Velocity	Not necessarily defined	Defined
Acceleration	Not necessarily defined	Usually considered
Example	Shortest obstacle-free route	Same route traversed at specified speed

Path Planning

Path planning determines a collision-free route from a start state to a goal state while considering obstacles and robot constraints.

Example: A* Algorithm

A* is a graph-search algorithm that finds a low-cost route using:

$f(n)=g(n)+h(n)$

where:

$g(n)$ = cost from start to node $n$
$h(n)$ = estimated cost from $n$ to goal
$f(n)$ = estimated total cost

Working

Represent the environment as a graph/grid.
Put the starting position in the open list.
Calculate $f(n)$ for candidate nodes.
Select the node with the lowest estimated cost.
Expand its neighbors while avoiding obstacles.
Repeat until the goal is reached.
Trace parent nodes backward to obtain the path.

Advantages of A*

Complete for appropriate finite graphs
Finds an optimal path when the heuristic is admissible
Widely used in grid-based mobile robot navigation

Conclusion

A path specifies where the robot moves, while a trajectory specifies where and when it moves. A* is a common path-planning method for finding an efficient obstacle-free route.

Q6(b). What is soft robotics? Explain the application of AR & VR in Robotics.20257m

Soft Robotics

What is soft robotics? Explain the application of AR & VR in Robotics.

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Worked Solution

Solution: Soft Robotics and AR/VR in Robotics

Soft Robotics

Soft robotics is a branch of robotics that uses compliant materials and structures rather than only rigid links and joints. Typical materials include elastomers, silicone-based materials and flexible polymers.

Features

High flexibility
Safe physical interaction
Ability to conform to irregular objects
Useful for delicate handling
Can tolerate some mechanical deformation

Applications

Medical and rehabilitation robots
Wearable devices
Soft grippers
Food handling
Human-robot interaction
Search and rescue

AR in Robotics

Augmented Reality (AR) overlays digital information onto the real environment.

Applications include:

Robot maintenance instructions
Visualization of robot trajectories
Operator guidance
Workcell monitoring
Training and education

For example, an operator can use AR glasses to see the robot's planned path and warnings overlaid on the physical workcell.

VR in Robotics

Virtual Reality (VR) creates an immersive computer-generated environment.

Applications include:

Robot simulation
Operator training
Virtual commissioning
Remote robot operation
Workspace design
Human-robot interaction studies

AR vs VR

AR	VR
Adds digital information to the real world	Replaces the user's visual environment with a virtual environment
Useful for maintenance and guidance	Useful for simulation and training
User remains aware of physical surroundings	User primarily interacts with the virtual environment

Conclusion

Soft robotics improves safe and adaptive physical interaction, while AR and VR improve robot programming, simulation, training, visualization and operation.

Q7(a). What is Singularity of Robot? Explain the significance of Mapping in autonomous navigation of Robot.20257m
Autonomous Navigation
What is Singularity of Robot? Explain the significance of Mapping in autonomous navigation of Robot.

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Worked Solution
Solution: Robot Singularity and Mapping

Robot Singularity

A singularity is a robot configuration in which the manipulator loses effective degrees of freedom or the Jacobian matrix becomes rank-deficient.

At a singular configuration, some desired Cartesian motions may require extremely large joint velocities or may become impossible.

Effects

Loss of a direction of motion

Very high joint velocities near the singularity

Reduced controllability

Possible path-tracking problems

Increased mechanical/control stress

Example

For an articulated robot, a wrist singularity can occur when two wrist axes become aligned, making two rotational directions indistinguishable.

Mapping in Autonomous Navigation

Mapping is the process of constructing a representation of the robot's environment using sensor data such as LiDAR, depth cameras or sonar.

Sensors → Sensor Data → Mapping/SLAM → Environment Map ↑ Robot Pose

Importance

Obstacle representation — identifies free and occupied regions.

Path planning — planners use the map to find safe routes.

Localization — the robot compares sensor observations with the map to estimate its position.

Navigation — enables movement toward goals while avoiding obstacles.

Exploration — allows robots to build maps of previously unknown environments.

Occupancy Grid

A common 2D representation divides the environment into cells classified approximately as:

occupied

free

unknown

Conclusion

Singularity concerns the robot manipulator's kinematic limitations, whereas mapping provides the environmental information required for autonomous navigation, localization and path planning.

Q7(b). Explain the process of debugging in RAPID program.20257m

RAPID

Explain the process of debugging in RAPID program.

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Worked Solution

Solution: Debugging a RAPID Program

Debugging is the systematic process of finding and correcting syntax, logic, motion and runtime errors in a RAPID robot program.

Debugging Process

1. Check Program Syntax

The RAPID editor/controller checks the program for invalid syntax, missing declarations, incorrect parameters and unsupported instructions.

2. Check Data and Variables

Verify:

Variable declarations
Data types
Tool data
Work-object data
Target positions
Speed and zone parameters

3. Check Program Logic

Trace the program flow and verify conditions, loops, subroutine calls and I/O operations.

4. Test in Simulation or Low-Speed Mode

Run the program under controlled conditions before full-speed automatic operation.

5. Use Step-by-Step Execution

Execute one instruction at a time to identify the instruction where behavior diverges from the expected result.

6. Monitor Inputs and Outputs

Check sensor inputs and actuator outputs to ensure that the robot is receiving and producing the expected signals.

7. Check Motion Instructions

Verify that the target is reachable and that the tool, work object, speed and orientation are correct.

8. Correct and Re-test

Modify the program, execute the relevant section again and verify the correction.

Common Errors

Error	Possible cause
Syntax error	Incorrect instruction or parameter
Unreachable target	Target outside workspace
Unexpected motion	Wrong coordinate/tool data
I/O failure	Incorrect signal configuration
Logic error	Incorrect condition or program flow
Collision risk	Poor path or workcell setup

Safety

Debugging should be performed using appropriate safety procedures, reduced speed and controlled access to the robot cell. Never rely only on software debugging to prevent physical collisions.

Conclusion

Effective RAPID debugging combines syntax checking, data verification, step execution, I/O monitoring, motion validation and controlled re-testing.

Q8(a). List out the major components of a robotic arm, explain the function of each component.20257m
Robot Fundamentals
List out the major components of a robotic arm, explain the function of each component.

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Worked Solution
Solution: Major Components of a Robotic Arm

A robotic arm is a programmable mechanical system consisting of links, joints, actuators, sensors, a controller and an end effector.

Major Components

1. Base

The base supports the robot and provides the reference frame. In articulated robots, it may also contain the first rotational joint.

2. Links

Links are rigid mechanical members connecting joints. They determine the robot's geometry and reach.

3. Joints

Joints provide relative motion between links.

Common types include:

Revolute joint — rotational motion

Prismatic joint — linear motion

4. Actuators

Actuators generate the forces/torques required to move joints. Electric servo motors are common in industrial robots.

5. Gear/Transmission System

Gearboxes and transmissions transfer motor motion to the joints while providing suitable speed, torque and positioning characteristics.

6. Wrist

The wrist provides orientation of the end effector, commonly through multiple rotational axes.

7. End Effector

The end effector performs the actual task, such as gripping, welding, painting or machining.

8. Sensors

Sensors provide information about joint position, velocity, force, torque, temperature or the external environment.

9. Robot Controller

The controller executes the robot program, processes sensor information and generates commands for the actuators.

10. Teach Pendant

A teach pendant provides a human-machine interface for jogging the robot, teaching positions, programming and monitoring operation.

Simplified Structure

Controller │ Servo drives │ Base → Joints → Links → Wrist → End Effector ↑ ↑ ↑ Sensors Actuators Workpiece

Conclusion

The coordinated operation of mechanical structure, actuators, sensors, controller and end effector allows an industrial robot to perform precise programmable tasks.

Q8(b). Write short notes on Robotic Process Automation.20257m

Soft Robotics

Write short notes on Robotic Process Automation.

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Worked Solution

Solution: Robotic Process Automation (RPA)

Robotic Process Automation (RPA) is the use of software bots to automate repetitive, rule-based digital tasks performed by humans on computer systems.

Working Principle

Input/Data → RPA Bot → Rule Processing → Application Actions → Output

An RPA bot interacts with software applications through their user interfaces or available APIs and follows predefined workflows.

Common RPA Tasks

Data entry
Copying information between applications
Generating reports
File processing
Form filling
Invoice processing
Email-based workflows
Data extraction

Characteristics

Rule-based operation
High repeatability
Fast execution
Consistent processing
Reduced manual effort
Easy scaling for repetitive workflows

RPA vs Physical Robotics

RPA	Physical Robotics
Primarily software-based	Physical machines interact with the environment
Automates digital workflows	Automates physical tasks
Works with software applications	Uses actuators and sensors
Example: automated data entry	Example: robotic assembly

Benefits

Reduces repetitive manual work
Reduces human error in standardized tasks
Improves processing speed
Provides consistent execution
Allows people to focus on higher-value work

Limitations

RPA is less suitable when processes require complex judgment, frequent unexpected changes or highly unstructured information without additional AI capabilities.

Conclusion

RPA automates repetitive, rule-based computer tasks using software bots. In a broader robotics curriculum, it demonstrates how automation principles extend beyond physical robots into digital workflows.

Q9(a). Explain the structure and classification of VAL Language Commands. Write examples of Hand control and Program control commands in VAL-I.20257m
VAL-I
Explain the structure and classification of VAL Language Commands. Write examples of Hand control and Program control commands in VAL-I.

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Worked Solution
Solution: VAL Language Commands

Introduction

VAL (Variable Assembly Language) is a robot programming language used with industrial robot systems. VAL/VAL-II commands can be grouped according to their purpose, including motion, hand/end-effector control and program control.

Classification of VAL Commands

1. Motion Control Commands

Used to move the robot to taught or specified positions.

Examples include commands conceptually equivalent to:

MOVE P1 MOVE P2

2. Hand Control Commands

Used to operate the robot's end effector or gripper.

Examples:

OPENI CLOSEI

The exact instruction names can vary with the VAL controller/version; the important purpose is to open/close or actuate the robot hand.

3. Program Control Commands

Control the sequence of execution, including calls, branches, waits and program termination.

Examples conceptually include:

CALL PICK WAIT STOP

4. I/O and Sensor Commands

Used to read inputs and control outputs associated with sensors, grippers and external equipment.

5. Variable/Data Commands

Used to store and manipulate positions, numerical values and status information.

Example Pick-and-Place Sequence

MOVE PICK_APPROACH MOVE PICK CLOSEI MOVE PICK_APPROACH MOVE PLACE OPENI MOVE HOME

Hand Control

Hand commands directly control the end effector. For example, an open-hand command releases a workpiece, while a close-hand command grips it.

Program Control

Program-control commands determine execution flow. For example, a call command can execute a subprogram, a wait command can synchronize operation with a sensor, and a stop/end command can terminate execution.

Conclusion

VAL commands are organized according to functions such as motion, hand control, program control, I/O and data handling. This classification makes industrial robot programs easier to structure and maintain.
Q9(b). Describe the importance of Collision detection and repeatability measurement of a robot in industrial applications.20257m
Robot Performance
Describe the importance of Collision detection and repeatability measurement of a robot in industrial applications.

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Worked Solution
Solution: Collision Detection and Repeatability Measurement

1. Collision Detection

Collision detection determines whether the robot, its end effector, workpiece or surrounding equipment may come into contact during operation.

Importance

Protects workers and equipment

Prevents damage to the robot and workpiece

Reduces downtime

Improves path planning

Supports safer automated operation

Methods

Model-based detection — compares robot geometry with the workcell model.

Sensor-based detection — uses force/torque, proximity or other sensors.

Controller monitoring — abnormal motor torque/current can indicate unexpected contact.

Simulation — checks planned paths before executing them on physical equipment.

Robot Model + Workcell Model ↓ Collision Checking ↙ ↘ Collision Safe path ↓ ↓ Stop/avoid Execute

2. Repeatability Measurement

Repeatability describes how closely a robot returns to the same position when commanded repeatedly under the same conditions.

It is different from accuracy. A robot can be highly repeatable but consistently offset from the desired target.

Measurement Procedure

Select a reference target.

Command the robot to the target repeatedly.

Record the actual positions reached.

Determine the spread of the measured positions.

Compare the spread with the specified repeatability.

Conceptually, if the measured positions are $p_1,p_2,\ldots,p_N$ , the deviation from their mean position can be evaluated using distance/error measures.

Industrial Importance

Collision Detection

Essential for safe operation in:

Assembly

Welding

Material handling

Human-robot collaboration

Automated machining

Repeatability

Important for:

Pick-and-place

Assembly

Welding

Painting

Inspection

Precision manufacturing

High repeatability ensures consistent product quality and reduces rejected parts.

Conclusion

Collision detection protects the robot, workcell and people, while repeatability measurement verifies that the robot can consistently return to commanded positions. Both are critical for reliable industrial automation.

Robotic Programming and Software Development

Solution: MCQs

Final Answers

Solution: Types of Robot Coordinate Systems

1. Cartesian Coordinate System

2. Cylindrical Coordinate System

3. Spherical / Polar Coordinate System

4. Joint / Articulated Coordinate System

5. Tool Coordinate System

6. World / Base Coordinate System

Comparison

Conclusion

Solution: Classification of End Effectors

Classification

1. Grippers

2. Vacuum Grippers

3. Magnetic Grippers

4. Welding End Effectors

5. Spraying/Painting End Effectors

6. Drilling and Machining Tools

7. Special-Purpose End Effectors

Active and Passive End Effectors

Conclusion

Solution: ROS Architecture and Its Use

Introduction

ROS Architecture

1. Nodes

2. Topics

3. Services

4. Actions

5. Messages

6. Packages and Catkin Workspace

Use in Modern Robotics

Advantages

Conclusion

Solution: Setting Up a Catkin Workspace

Steps

1. Create the workspace

2. Initialize the workspace

3. Source the workspace

4. Create a package

5. Build the workspace

6. Verify the package

Workspace Structure

Conclusion

Solution: ROS Services vs ROS Actions

ROS Service

ROS Action

Conclusion

Solution: VAL-II Pick-and-Place with Sensor Condition

Example

Operation

Flowchart

Importance of the Conditional Statement

Solution: AML Language, Constants and Variables

What is AML?

Constants

Variables

Handling Variables

Example Logic

Advantages

Conclusion

Solution: LiDAR Sensors

Introduction

Working Principle

Functions

Usage in Autonomous Robots

Applications

Advantages

Limitations

Conclusion

Solution: Path vs Trajectory and Path Planning

Path

Trajectory

Path Planning

Example: A* Algorithm

Working

Advantages of A*

Conclusion

Solution: Soft Robotics and AR/VR in Robotics