PLC Programming - Advanced Object Oriented Programming (OOP)

Explore how object oriented programming for automation reorganizes PLC design around data and objects, using encapsulation, inheritance, polymorphism, and abstraction to enhance modularity, reusability, and maintenance in Codesys environments.

Explore object-oriented programming in automation through the IEC 61131-3 function block as the class, with interfaces, retained variables, and independent instances, plus Co-sysop enhancements.

Explore Codesys methods as a first object oriented feature for function blocks, enabling actions as methods with inputs, outputs, and access to parent block variables, improving readability and encapsulation.

Explore how to transform a traditional PLC function block into an object oriented design by introducing methods for power, move, and reset operations, while preserving drive data and state management.

Explore access specifiers in Codesys function blocks, including public, private, internal, and protected. Encapsulation protects internal state and simplifies interfaces.

Explore how properties provide controlled data access in a function block by using get and set methods to enable validation, on-demand conversions, and encapsulation.

Transform the function block into an object oriented class by introducing read-only properties for power, movement, position, and velocity, with an update method reading drive data.

Discover the this pointer that references the current function block instance and use this to access local variables and methods, improving readability and preventing name shadowing.

Convert a piston control function block into an object oriented function block, using methods and properties to start, stop, enable, and read state through a four-state cycle with limit switches.

Demonstrates converting a function block into an object oriented piston with enable and disable methods, a cyclical update, and a state property for clean transitions.

Explore how pointers work in Codesys, including memory addresses, dereferencing, and the adr expression, while highlighting safety risks and practical uses with function blocks and data manipulation.

Explore how references in Codesys provide safer indirect access than pointers, using is valid ref and ref equal for type-safe, memory-safe access to data and function blocks.

The lecture demonstrates using references in Codesys, showing how to declare and manipulate references to doubles and function blocks, validate references, and switch between blocks to illustrate polymorphism.

Explore how inheritance lets derived function blocks extend base blocks and inherit variables, inputs/outputs, and methods. This enables code reuse, easier maintenance, and sets the stage for polymorphism in PLC.

Extend a base function block in Codesys by inheritance, adding an error property from status word bit four and a reset mechanism, then override methods to update drive data.

Master overriding base methods, using the super pointer to extend behavior, and design abstract function blocks and methods as blueprints for inheritance.

Explore how to override base class methods in a function block drive, use protected access and super to manage drive data, and validate bit four handling in the control word.

Explore inheritance by building a base function block for all grippers and extending it to pneumatic vacuum, clamp, and servo variants while maintaining the robots' shared movement logic.

learn to design an inheritance-based gripper framework by creating a gripper base function block, abstract methods for state transitions, and derived classes with customized outputs and conditions.

Learn inheritance by creating three derived gripper classes from a base, implementing their outputs and update logic and reusing base code to enable polymorphism among pneumatic, clamp, and servo grippers.

Explore when to use interfaces over inheritance to define capabilities for unrelated function blocks, enforce contracts, enable polymorphism, and implement resettable and diagnosable behaviors.

Learn how to create and implement interfaces in Codesys, attach them to function blocks, and use resettable and enable interfaces with an error ID for robust contracts.

Explore polymorphism in plc programming by using interfaces to interact with different function blocks, enabling dependency injection, decoupling logic from devices, and safely iterating diverse devices.

Explore polymorphism in PLC programming by using interfaces to decouple control of drives and pistons, enabling generic function blocks and interface queries.

Explore interfaces and polymorphism to unify three robot programs into a single function block by using dependency injection to pass robot and gripper interfaces, enabling state-machine logic without code changes.

Learn to design interfaces for robot and gripper, implement dependency injection and polymorphism with function blocks, enabling generic logic and reusable, scalable code.

Compare inheritance and interfaces for structuring function blocks, highlighting code reuse versus decoupling, and advocate a mixed approach using a universal base with capability interfaces to avoid tight coupling.

Debug oop plc code with breakpoints in a safe simulation, and use step over, step into, step out, plus the call stack and cmp log to trace nested methods.

Explore design patterns as reusable templates that describe how objects interact to solve common automation problems, and adapt them to PLC constraints, focusing on state, command, and observer.

Explore three object-oriented design patterns for PLC programming: the state, command, and observer patterns, using function blocks and interfaces to manage complex states, sequences, and notifications in Codesys automation.

Master best practices for object oriented programming in plc development by applying the single responsibility principle, programming to interfaces, and favoring composition over inheritance to ensure maintainability, safety, and clarity.

Explore advanced object oriented programming in PLC environments, covering encapsulation, inheritance, interfaces, and polymorphism, and apply design patterns to build maintainable, reusable, scalable automation solutions.

Advance plc programming techniques emphasizing structured and efficient code development and modularity. Build complete machines with reusable tools, simulate with Codesys, and visualize mechatronic systems using Godot's 3D engine.