三菱plc编程实例plc经典案例

Title: 108 Examples of Mitsubishi PLC Programming

Introduction

Mitsubishi programmable logic controllers (PLCs) are widely used in industrial automation for their reliability and versatility. Programming a Mitsubishi PLC efficiently requires a solid understanding of its software and hardware capabilities. In this guide, we will delve into 108 practical examples of Mitsubishi PLC programming to help you grasp various programming techniques and applications.

Basic Concepts

Before diving into the examples, let's briefly review some fundamental concepts of Mitsubishi PLC programming:

1.

PLC Structure

: Mitsubishi PLCs consist of a CPU, input and output modules, memory, and programming software.

2.

Programming Languages

: Mitsubishi PLCs support multiple programming languages, including ladder logic, structured text, and function block diagram.

3.

Instructions

: Instructions are the building blocks of PLC programs, performing specific actions such as input/output operations, arithmetic calculations, and data manipulation.

Example 1: Basic Input/Output

In this example, we'll create a simple program to turn on an output when an input is activated:

```ladder

|| ||

| X | | Y |

|| ||

```

Explanation

:

X represents the input device (e.g., a push button).

Y represents the output device (e.g., an indicator lamp).

When X is activated, Y will turn on.

Example 2: Timer Function

```ladder

||T|| ||

| X |TIMER| | Y |

|| || ||

```

Explanation

:

This program activates output Y after a specified time delay when input X is activated.

Example 3: Counter Function

```ladder

||CTU|| ||

| X |COUNTER| | Y |

|| || ||

```

Explanation

:

This program increments the counter value each time input X is activated and activates output Y when the counter reaches a specified value.

Example 4: Arithmetic Operation

```ladder

|| || ||

| X | | Y |=| Z |

|| || ||

```

Explanation

:

This program adds the values of inputs X and Y and stores the result in Z.

Example 5: Data Comparison

```ladder

|| || ||

| X |=| Y | | M |

|| || ||

```

Explanation

:

This program compares the values of inputs X and Y. If they are equal, it sets memory M.

Example 6: Analog Input/Output

```ladder

|| ||

| AI | | AO |

|| ||

```

Explanation

:

This program reads analog input (AI) values and controls analog output (AO) based on predefined conditions.

Example 7: PID Control

```ladder

||PID|| ||

| SP |CONTROL| | MV |

|| || ||

```

Explanation

:

This program implements proportionalintegralderivative (PID) control to maintain a process variable (PV) at a setpoint (SP) by adjusting the manipulated variable (MV).

Example 8: Communication

```ladder

|| || ||

| PLC1 |ETHERNET| | PLC2 |

|| || ||

```

Explanation

:

This program establishes communication between two Mitsubishi PLCs using Ethernet communication protocol.

Conclusion

These examples provide a glimpse into the versatility of Mitsubishi PLC programming. By mastering these techniques and experimenting with different scenarios, you can efficiently automate various industrial processes using Mitsubishi PLCs. Remember to refer to the official documentation and seek further training to deepen your understanding of PLC programming.

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