Documentation for version 2.4 and similar legacy versions can be found on industrial training sites: Melsec Medoc Software | PLCtalk - Interactive Q & A
MELSEC MEDOC 2.4 is a legacy DOS-based programming software for Mitsubishi Electric MELSEC A and F series PLCs
| Software Suite | Primary Component | Target PLC Series | Key Features | |:---|:---|:---|:---| | | GX Works3 | MELSEC iQ-R, iQ-F, L series | Integrated suite for PLC, motion (MT Works2), GOT (GT Works3); Graphical system configuration; Structured text, ladder, SFC; Navigator for central system management | | MELSOFT GX Works2 | GX Works2 | MELSEC Q, L, FX series | Professional ladder, SFC, structured text; Supports legacy FX series; Extensive debugging | | MELSOFT GX Developer | GX Developer | MELSEC Q, QnA, A, FX series | Older Windows-based software; Common for transition from MEDOC; Allows importing MEDOC print files |
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Finding a reliable download for a piece of software released decades ago can be challenging. Because Mitsubishi Electric has officially transitioned support to newer platforms, the software is generally classified as legacy or "abandonware." 1. Official Mitsubishi Electric Support Channels
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MELSEC MEDOC (sometimes “MEDOC Plus”) is older Mitsubishi Electric PLC programming software used to communicate with and program MELSEC family PLCs (commonly A-series/A1, FX and some earlier FX variants). Version numbers commonly cited in forums and reseller listings include DOS-era 2.40 (often written 2.4 or 2.40) and a Windows FX-specific package (FX 1.x / FX-PCS/WIN). MEDOC 2.40 is typically a DOS application or early Windows-era utility distributed historically on CD with Mitsubishi PLCs or sold by authorized resellers. Documentation for version 2
A free, open-source DOS emulator that recreates the environment needed to run the 16-bit executable.
: Contacting a local Mitsubishi Electric Automation distributor is the most reliable way to obtain a licensed copy or a modern equivalent that supports your specific legacy PLC. Technical Considerations for Installation
Operates in a DOS environment, relying on keyboard shortcuts rather than mouse clicks. Can’t copy the link right now
Once you have MEDOC installed and running, here is a basic overview of the workflow:
You’ll see the classic blue menu-driven interface.
Missing .dat , .exe , or configuration files can cause the software to crash during PLC compilation, risking logic corruption.