PLC Introduction and Ladder Logic Programming

PLC Introduction

• PLC stands for Programmable Logic Controller
• Presented by Dr. Abdelazeem A. Esmail, Lecturer at Delta Technological University
• Part of the Faculty of Technological Industry and Energy

Course Hours

• Credit hours: 4
• Total hours: 7
• Lecture hours: 2
• Tutorial hours: 2
• Lab/Workshop hours: 3

PLC Ladder Logic Programming

• Image of a PLC unit is shown
• Includes input/output terminals
• Ladder logic is a programming language
• Ladder logic diagrams are based on electrical circuit diagrams

Ladder Instruction Set

• Includes basic ladder instructions
• Covers Input, Output, Bit Logic, Marker
• Includes mov, arithmetic, logic, and controlling instructions

What and Why Ladder

• Ladder logic represents a program using ladder diagrams
• Ladder logic diagrams are based on electrical circuit diagrams
• Diagrams show the connections of components like Start, Stop, Circuit Breaker and Contractor
• A ring circuit connects distribution points in a continuous closed circuit

Basics of Ladder Basic Instructions

• Input, Output, Marker, and Bit Logic are shown
• Rungs, tags, and comments of the programming software are mentioned
• Rungs represent actions and outputs

Basic Operation

• Shows examples of ladder logic operations
• Includes instructions like LD, LDI, OUT, OR, and AND
• Explains the logic operations in a PLC program

Simple Example

• Shows a simple electrical circuit with switches (SW1, SW2) and a coil
• Explains how inputs and the output relate

Example 1

• Provides logic equations needing to be implemented as ladder logic
• Demonstrates the programming for logical operations of inputs (X1, X2,X3) and outputs (O/P1, O/P2, O/P3)

Example 2

• Presents ladder logic for a specific process
• Shows how to program a process when specific input conditions are met
• Explaining how output (Q0.0) depends on inputs (10.0, 10.1, and 10.2)

Example 3

• Shows a schematic diagram to be implemented as ladder logic
• Shows inputs and outputs of a circuit
• Includes a logical table to show the various combinations of input and the corresponding output

Example 4

• Requires a ladder diagram implementation of another schematic diagram
• Provides inputs and outputs values in a table
• Includes a logical table for the various combinations of input and the corresponding output

Example 5

• Presents a relay schematic to be implemented as ladder logic
• Shows inputs and outputs of a circuit

Example 6

• Presents a schematic diagram of a circuit in terms of Inputs and Outputs needed for ladder logic
• Includes a table that shows the various combinations of inputs and the corresponding outputs

PLC Input/Output Connections

• Diagram showing the connections of a PLC unit for controlling various inputs and outputs
• Diagrams showing connections for various inputs and outputs
• Showing voltage requirements for the signals

PLC Programming Software

• Diagram demonstrating signals of the PLC based program inputs and outputs

Entry Reset Rung

• Shows the logic equation to be implemented as ladder logic
• Logic equation for entry reset for various input and output conditions
• K-Map used to simplify the logic function

This quiz covers the fundamentals of Programmable Logic Controllers (PLC) and the specifics of ladder logic programming. You'll learn about the instruction set, the significance of ladder diagrams, and how they mimic electrical circuit diagrams. Test your knowledge of this essential technology used in automation and control systems.