🎥In this video, part 1 of the PLC programming languages, we will cover the essential features of Ladder Diagram and Function Block Diagram languages. You'll gain an understanding of their core structure, advantages, disadvantages, and the scenarios in which they are most suitable.
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💬 Video Summary:
What is a PLC?
- A Programmable Logic Controller or PLC is a small, industrial computer engineered for supervising equipment and processes in industrial settings from one central location.
A PLC requires programming in a particular language and downloading the program directly into the PLC CPU to function correctly.
PLC Programming Languages Types
- Under the IEC section 61131-3 standard, there are five programming languages utilized for different PLC hardware platforms, namely Ladder Diagram (LD), Function Block Diagram (FBD), Sequential Function Charts (SFC), Structured Text (ST), and Instruction List (IL).
Ladder Diagram Basics
- Ladder Diagram serves as a graphical, top-level PLC programming language. The Ladder Diagram is the initial programming language for PLCs, evolving naturally due to its close resemblance to electrical relay circuit schematics.
- A Ladder Diagram is arranged as horizontal lines, known as rungs, with two vertical bars at either end called power rails.
- The input instructions, called contacts, are located on the left of each rung. The right side features output instructions, known as coils.
- The reading direction is first from the left side to the right and then downward from the top.
Ladder Diagram Advantages
- The Ladder Diagram's capability for online editing enables users to make real-time modifications to the control logic of a running system, all while ensuring that the system continues to operate smoothly without any interruptions.
Ladder Diagram Disadvantages
- In the Ladder Diagram, the absence of specific instructions can introduce complexities, potentially making programming operations such as motion control procedures challenging.
Ladder Diagram Application
- Ladder Diagram emerges as a premier programming language for systems that manage extensive and complex Boolean logic.
Function Block Diagram Basics
- FBD relies on standardized blocks whose purpose is to determine the relationship between the input and output statuses. Function Blocks sit on a workspace sheet where they are linked to one another through lines of connection.
Function Block Diagram Advantages
- FBD offers the benefit of consolidating various programming lines into single or multiple functional blocks, thus streamlining the design process and enhancing organization.
Function Block Diagram Disadvantages
- Programming in FBD can be messy. If blocks are not placed in an organized manner on the sheet, it can quickly become a confusing mess, making it hard to grasp what's happening.
Function Block Diagram Application
- FBD works well with continuous process management, repetitive tasks with regular code usage, systems needing motion control, and PID control mechanisms.
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⏰ TABLE OF CONTENTS ⏰
00:00 What is a PLC?
00:41 PLC Programming Languages Types
01:39 Ladder Diagram Basics
03:08 Ladder Diagram Advantages
03:53 Ladder Diagram Disadvantages
04:31 Ladder Diagram Application
04:45 Function Block Diagram Basics
05:44 Function Block Diagram Advantages
06:25 Function Block Diagram Disadvantages
06:58 Function Block Diagram Application
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