Program creation support device and computer program product

A program creation support device for supporting creation of a control program used in a programmable logic controller, the program creation support device comprising one or more memories configured to store executable units, and one or more processors, operatively coupled to the one or more memories, configured to execute the executable units, the executable units comprising:

• an information reception unit configured to receive, in natural language, first information regarding an input and output device connected to the programmable logic controller, second information regarding at least one of a command or a program module for controlling the input and output device, and third information indicating a control content realized in combination with the command or the program module;
• a prompt generation unit configured to generate a prompt in natural language for generating a text code corresponding to a ladder diagram based on the first information, the second information, and the third information received by the information reception unit;
• a large language model (LLM) interface configured to transmit the prompt generated by the prompt generation unit to an LLM and receive a response statement corresponding to the prompt from the LLM;
• and
• a conversion unit configured to convert a text code included in the response statement received via the LLM interface into a ladder diagram,
• wherein the prompt generation unit adds, to the prompt, fourth information for constraining the text code included in the response statement to be suitable for the conversion into the ladder diagram by the conversion unit.