2.4 Download - Melsec Medoc

Example A — Read an FX PLC program with MEDOC (high-level)

Example B — Convert MEDOC files to modern tool

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.

Common user needs:

MEDOC 2.4 remains a vital tool for keeping decades-old production lines running. While obsolete for new designs, its minimal hardware requirements and reliability in DOS emulators make it a gem for retro industrial control.

Pro tip: Always back up the PLC program before modifying it with MEDOC. A wrong keystroke in DOS can overwrite memory without confirmation dialogs.

MELSEC MEDOC 2.4 is a legacy, DOS-based programming environment developed for Mitsubishi Electric’s MELSEC FX and A Series PLCs. Released in the early 1990s, it served as the industry standard before being superseded by Windows-native tools like GX Developer and GX Works. Availability and Download

Official Status: MEDOC is discontinued and no longer officially distributed by Mitsubishi Electric.

Version 2.4 Specifics: Version 2.4 (and its patch 2.41) was originally a proprietary variant by Beijer Electronics, a Mitsubishi distributor in Europe.

Where to Find: Because it was commercially licensed software, it is not legally available for free download on official sites. Users often source it through:

Legacy Archives: Re-distributors like Informer Technologies or industrial forums like PLCTalk. melsec medoc 2.4 download

Mitsubishi Support: Some regional branches may provide legacy support files upon request for existing license holders. Key Features & Supported Hardware

Programming: Supports ladder logic with mnemonic and rung-based editing.

PLC Models: Compatible with older MELSEC controllers including F1/F2, FX, and A1S series.

Maintenance: Includes online monitoring (F8 key), device forcing, and simple diagnostics.

File Structure: Uses .pro for program logic, .sys for I/O configuration, and .okb for system parameters. Installation & Modern Compatibility

Running 16-bit DOS software on modern 64-bit Windows requires emulation or specific configurations:

DOSBox Emulation: Recommended for Windows 10/11 users to handle the DOS environment.

Serial Communication: Standard Windows COM port handling can interfere with MEDOC. A common fix on older Windows (like XP) is adding the switch e3f12 to the command line (e.g., C:\medoc\medoc.exe e3f12).

Start Options: The command MEDOC E3 is often used to activate extended memory management when running on a PC. Migration to Windows Software

If you need to modernize a system, keep these migration rules in mind: Melsec Medoc 2.5 - PLCTalk.net Example A — Read an FX PLC program with MEDOC (high-level)

Finding a legitimate download for MELSEC MEDOC 2.4 is difficult because it is legacy, DOS-based software that has been officially discontinued and replaced by newer suites like Where to Find the Software

Since Mitsubishi Electric no longer officially hosts direct download links for MEDOC 2.4 on its primary portals, you generally have three options: Third-Party Automation Forums : Sites like PLCTalk.net

often have community members who share legacy files and installation guides. Official Support Requests : You can contact your regional Mitsubishi Electric Factory Automation

representative. They sometimes provide legacy software to existing customers who need to maintain older machines (like the FX or A-series PLCs). Software Archives : Some users rely on Software Informer

or similar repositories, though caution is advised to ensure file integrity. Installation & Setup Guide

MELSEC MEDOC 2.4 is a DOS-based program, which creates compatibility issues on modern 64-bit Windows systems. Operating System : Use a dedicated DOS emulator like DOSBox or a virtual machine running Windows XP (32-bit) MS-DOS 6.22 Installation Command Copy the setup files to your drive (e.g., In a DOS environment, navigate to the folder: Run the installation by typing INSTALL A: C:\MEDOC (for diskette installs) or simply run 32-bit Version

: If you have the 32-bit "Plus" version, you can try running directly, but it may require Compatibility Mode (set to Windows 95/98). Essential Resources : You can find a MELSEC MEDOC Start-up Guide Beginner's Manuals on document sharing sites like Scribd. Hardware Compatibility : MEDOC is primarily used for older series PLCs. For newer hardware, use the Mitsubishi Search Portal to find modern engineering software. Are you looking to migrate a legacy program to a newer PLC, or do you specifically need to connect to an older machine

MELSEC MEDOC 2.4 is a legacy PLC programming software primarily used for older Mitsubishi MELSEC FX and A Series controllers. Originally designed for the DOS era, it remains a critical tool for engineers maintaining "vintage" industrial equipment that cannot be easily updated to modern software. Software Availability & Download

Finding a legitimate download for MEDOC 2.4 today can be challenging as it has been officially superseded by GX Developer and GX Works.

Official Sources: Mitsubishi Electric typically directs users to newer software. However, some legacy support files may still be accessible via the Mitsubishi Electric FA Download Center. Example B — Convert MEDOC files to modern

Third-Party Platforms: Sites like Software Informer host older program information, but actual download links are often unavailable or lead to tutorials rather than the full installer. Key Features and Experience

Ladder Logic Editor: Uses a "freeform" ladder editor that some users find helpful for design-heavy projects, while others feel it increases development time compared to modern drag-and-drop systems.

Monitoring & Troubleshooting: Includes essential tools for commissioning and real-time monitoring (F8 key in ladder mode).

Compatibility: It runs in a Windows DOS box, though users frequently encounter issues with serial port communication because Windows interferes with legacy messaging. Review: Pros & Cons Pros Cons Lightweight and efficient for older hardware. No "Save As" command, which is a major workflow irritation.

Critical for systems where the original toolchain must be preserved.

Difficult to set up communication on modern Windows (XP and later). Stable for the FX-range of PLCs.

Steeper learning curve for engineers used to modern GUI-based software. Modern Alternatives

GX Developer Version 8 Operating Manual - Mitsubishi Electric

Create a virtual machine with Windows 98 SE or MS-DOS 6.22.

MEDOC v2.4 is designed specifically for the following hardware families:

Before clicking any download link, it is vital to understand what this software is—and what it is not.

Why Version 2.4? Earlier versions (2.0, 2.1, 2.3) suffered from stability issues with extended memory managers and large ladder diagrams. Version 2.4 introduced improved memory handling, faster upload/download speeds via RS-232, and better support for third-party DOS emulators.