Discover 4 Ways of Programming Mitsubishi Electric PLC using ChatGPT AI

Published by Bob Odhiambo on

Discover how you can leverage ChatGPT an artificial intelligence (AI) to program a Mitsubishi Electric PLC hardware using four distinct methods.

Programmable Logic Controllers (PLCs) are integral components in industrial automation, controlling machinery and processes across various industries. Mitsubishi Electric PLCs are widely used for their reliability and flexibility in automation applications. In this article, we will explore a unique approach to programming Mitsubishi Electric PLCs using ChatGPT, a powerful language model developed by OpenAI. 

PLC programming using OpenAI's ChatGPT AI. Image used courtesy of the author.

Understanding Mitsubishi Electric PLCs 

Before delving into the programming process, it’s crucial to have an overview the basic components and functions of Mitsubishi Electric PLCs. These controllers are designed to handle input and output devices, executing control logic to automate industrial processes. Mitsubishi Electric PLCs come with a variety of models, each with its own set of features and capabilities. 


Integration with ChatGPT 

ChatGPT, based on the GPT-3.5 architecture, is a state-of-the-art language model capable of understanding and generating human-like text based on input prompts. Leveraging ChatGPT for programming Mitsubishi Electric PLCs introduces a novel way of creating logic and instructions. However, it is important to note that this approach is experimental and may require careful validation in real-world scenarios.

Setting Up the Environment 


  1. PLC Hardware Setup

Begin by setting up the Mitsubishi Electric PLC hardware. Connect input and output devices, power supply, and ensure proper wiring according to the system requirements. 


  1. MELSOFT Software Installation

Install the Mitsubishi Electric MELSOFT series software on your computer. This suite includes programming environments such as GX Works3, which is commonly used for Mitsubishi PLC programming. 


  1. ChatGPT Integration

To integrate ChatGPT into the programming process, you’ll need a platform that allows interaction with the language model through an API. OpenAI provides an API that you can use to communicate with ChatGPT programmatically. 


Programming Mitsubishi Electric PLCs with ChatGPT 

  • Define Project Requirements: Clearly define the project requirements and the logic that needs to be implemented. Break down the control system into functional blocks, and identify input and output points on the PLC. 
  • Create a Programming Template: Develop a programming template that includes the necessary sections for ladder logic, function blocks, and input/output assignments. This template will serve as a starting point for the ChatGPT-generated code. 

Ways of Programming Using GPT

  1. Structured Text: Add a prompt with your program parameter to the ChatGPT chat box stating the creation of a Structured Text for a Mitsubishi Electric PLC for the provided inputs/outputs.
structured text program from GPT

2. Instruction List: For this, just replace the word structured text in the first prompt to IL adding your I/O addresses. The following code will be generated.

instruction list generated with chatgpt

3. Ladder Diagram: Just like in instruction list, the prompt should include ladder diagram generation based on the I/O provided. The ladder is drawn as a series of dashes in plaintext. 

ladder diagram for Mitsubishi plc generated with chatgpt

4. Generate code with ChatGPT: This is the final approach to programming a Mitsubishi Electric PLC in which an API key provided by OpenAI can be added in the code to produce the needed results as shown below.

Utilize the ChatGPT API to generate preliminary code snippets. Input prompts should include specific details such as input and output configurations, desired logic operations, and any special conditions. ChatGPT will provide suggestions based on the input.

gpt code generation using API

Refine and Validate Code 

Review and refine the code generated by ChatGPT. Ensure that the logic aligns with the project requirements and industry standards. Validate the code using simulation tools provided by the MELSOFT environment. 


Debugging and Troubleshooting 

Debug the code by simulating different scenarios and checking for any errors or unexpected behaviors. Use the debugging tools within the MELSOFT software to identify and address issues. 



Document the generated code thoroughly. Include comments, annotations, and explanations for each section of the code to facilitate future maintenance and troubleshooting. 


Testing in Real-world Environment 

Once satisfied with the simulated results, download the code to the actual Mitsubishi Electric PLC hardware and test it in the real-world environment. Monitor the system closely and make adjustments as needed. 


ChatGPT in Mitsubishi Electric PLC programming   

The integration of ChatGPT into the Mitsubishi Electric PLC programming process provides a unique and innovative approach to logic development. However, it is essential to exercise caution and thoroughly validate the generated code to ensure its reliability and safety in industrial applications. This experimental method opens up new possibilities for human-machine collaboration in PLC programming, pushing the boundaries of automation technology. As always, stay updated with the latest developments in both PLC programming and natural language processing to leverage the full potential of such cutting-edge approaches. 

Bob Odhiambo

Bob Odhiambo is the Founder and C.E.O. at "Bob Teaches Tech". He is also an author who shares his mechatronics engineering expertise; from control engineering to design of mechatronics systems. He also works as a contributing author in EE Power and Control Automation. LinkedIn Profile:


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