MELSEC MEDOC 2.4 is a DOS-based programming and documentation software developed by Mitsubishi Electric. It was designed specifically to configure and program early generations of MELSEC PLCs using Instruction List (IL) and Ladder Logic diagrams. Supported PLC Series
You cannot run MEDOC 2.4 natively on 64-bit Windows. The 16-bit DOS subsystem was removed starting with Windows 11 and 64-bit Windows 10. You have two options:
: Activates extended memory (recommended for Windows environments). : High-resolution mode. 3. Project Creation & Programming New Project
A1N, A2N, A3N, A2A, A3A, A2U, A3U, and early AnS modular PLCs Features and Functionality
Ultimate Guide to MELSEC MEDOC 2.4: Legacy Programming for Mitsubishi PLCs
Documentation for version 2.4 and similar legacy versions can be found on industrial training sites: Melsec Medoc Software | PLCtalk - Interactive Q & A
: This is the safest bet. If you have a registered account, you can sometimes find legacy software in the "Downloads" or "Archive" section of the Mitsubishi Electric Automation website Third-Party Industrial Forums : Sites like PLCTalk.net
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MELSEC MEDOC (with later versions like 2.4 and 2.41) is a DOS-based programming software for Mitsubishi Electric's MELSEC PLCs. The "MELSEC MEDOC Plus" version was a 16-bit Windows program that complied with the IEC 61131 international standard, allowing for structured programming with languages like Ladder Diagram (LD), Instruction List (IL), and Sequential Function Chart (SFC). Its design aimed to break down large, complex programs into smaller, manageable modules to improve productivity and maintainability.
If you are using DOSBox, you must map your PC’s virtual USB COM port to a simulated DOS COM port. Open the dosbox.conf configuration file and edit the serial section: [serial] serial1=directserial realport:COM3 Use code with caution.
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