Learning PLC Ladder Logic

Get started with PLC ladder logic programming. Explore fundamental topics and review case studies that can help you grasp the real-world application of these concepts.

Introduction

• Program PLCs with ladder logic
• What you should know

1. PLC Programming

• PLC programming languages
• LogixPro PLC simulation software

2. Ladder Logic Basics

• Programming concept
• Input instructions
• Output instructions
• I/O with a push button and light
• I/O with alternating lights
• Field devices and program instructions
• Normally open (NO) contact with XIC and XIO
• Normally closed (NC) contact with XIC and XIO

3. Rung Operation

• Multiple inputs
• Example of multiple inputs (AND and OR)
• Multiple outputs
• Seal-in and hold-in instruction
• Branching operation and examples
• Rung operation case study, part 1
• Rung operation case study, part 2
• Multiple I/O case study
• Latch/unlatch output
• Latch/unlatch example

4. Timers and Counters

• Timer instruction overview
• Timer status bits (EN, DN, and TT)
• Timer types (TON and TOF) and diagrams
• Use a timer to flash a light
• Counter instruction
• Examples of counter types
• Counter and timer case study

5. Detailed Case Study: Plywood Sheets Process

• Case overview
• Part 1: Counting sheets
• Part 2: Running the conveyer
• Part 3: Applying paint
• Part 4: Programming the second conveyer
• Ladder logic program simulation
• Part 5: Add stops to complete the program

Conclusion

• Next steps