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The software primarily targets older Mitsubishi hardware, including: F1, F2, FX, FX0, FX0N, FX2N MELSEC A Series: A1, A2, A3, A2C, A1S, A2S MELSEC K Series: Legacy micro-controllers Why Do Engineers Still Need MEDOC 2.4?
Including the AnS (Small) and Large A-series modular PLCs (e.g., A1S, A2N, A3N).
October 26, 2023 Subject: Software Evaluation and Acquisition Overview Software: MELSEC MEDOC (Mitsubishi Electric MELSEC Documentation) Version: 2.4x (Final DOS-based iteration)
: Since modern laptops lack 9-pin serial ports, you will need a USB-to-RS232 adapter. Ensure it uses a high-quality chipset (such as FTDI or Prolific ) to prevent communication dropouts.
Technical Report: MELSEC MEDOC 2.4 Availability and Support Executive Summary melsec medoc 2.4 download
The fundamental programming cable required for FX and A-series PLCs. It converts RS-232 or USB signals into the RS-422 differential signals required by the PLC’s programming port.
Modern laptops lack the native 9-pin RS-232 serial ports required by legacy automation. You will need a high-quality USB-to-RS232 serial adapter. Opt for adapters utilizing the FTDI chipset , as cheaper chipsets often drop packets during critical PLC transfers. Programming Cables:
Because MEDOC is a DOS application, it cannot run directly on 64-bit Windows. However, it can run on 32-bit Windows or within specific environments. 1. The Virtual Machine Method (Recommended)
: 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 Ensure it uses a high-quality chipset (such as
: Supports mnemonic and rung-based ladder logic programming.
Mitsubishi Electric's Melsec Medoc 2.4 remains a critical software utility for industrial automation engineers managing legacy Programmable Logic Controllers (PLCs). Released during the DOS era, this software is the primary tool for maintaining, programming, and troubleshooting older Mitsubishi PLC systems.
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It provides a raw look at how PLC logic was structured before the "bloat" of modern graphical interfaces. Compatibility and Installation Challenges Modern laptops lack the native 9-pin RS-232 serial
: It has been replaced by GX Developer and GX Works2/3 , which offer full Windows compatibility and advanced diagnostic tools.
DOSBox is an emulator that allows you to run DOS applications. Download and install DOSBox.
The official programming cable is the cable. This cable converts the PC's RS-232 signal to the RS-422 signal required by the PLC's programming port. The SC-09 has been discontinued for some time, but you may still find used or third-party equivalents. The table below outlines your connectivity options:
Despite being decades old, engineers and maintenance technicians still seek out this software for several reasons:
25 Jun 2025
