Communicating with legacy Mitsubishi hardware requires specific pinouts and hardware translation interfaces. Standard serial ports must be strictly mapped through the emulation software. Target PLC Family Required Cable Architecture Interface Module Required F2-20GF1 Interface Unit MELSEC FX Series RS-232 to RS-422 Cable SC-09 Interface Box MELSEC A Series AC30R4 (RS-232) or AC30R2 (RS-422) Built-in Core CPU Port
: Connecting to an old PLC (like the F1 or FX series) usually requires an SC09 programming cable and often a USB-to-RS232 serial adapter .
Ultimately, MELSEC MEDOC 2.4 stands as a testament to industrial durability. While it may look prehistoric next to today’s software, its utility ensures it will remain a hot commodity for as long as vintage Mitsubishi PLCs continue to power factory floors. To help you get your legacy PLC project running, tell me:
Because Mitsubishi has officially moved on to GX Works3, they no longer actively sell or "host" MEDOC on their main commercial pages. To find a working link, you generally have to look in three places: 1. Mitsubishi Electric Regional Websites
(MELSEC Electronic Data On Computer) itself is a very real and significant piece of industrial history. Below is a full review of the legitimate legacy software. MELSEC MEDOC 2.4 / 2.5: Legacy Software Review melsec medoc 24 download hot
Industrial machinery is built to last. It is not uncommon to walk into a textile mill, packaging plant, or automotive facility and find a Mitsubishi FX0 or F2 PLC that has been running continuously for 30 years. If a machine breaks down or requires a minor logic modification, a technician cannot use modern software to communicate with these ancient controllers. MEDOC 2.4 is often the only tool capable of opening and editing these original programs. 2. Low Resource Overhead
If you are working on a specific recovery project, let me know:
Whether you're looking for a fresh download or trying to get this DOS-based relic to run on a modern PC, this guide covers everything you need to know. What is MELSEC MEDOC 2.4?
The tool is uniquely engineered to communicate with legacy Mitsubishi architectures that modern environments do not support. Beijer Electronics / Mitsubishi Electric Interface Style Text-mode console / Keyboard-driven navigation Primary Target Hardware Mitsubishi F, F1/F2, A, A0J2, and early FX series PLCs Communication Protocols Serial point-to-point (RS-232 / RS-422) Supported PLC Hardware Ultimately, MELSEC MEDOC 2
Modern versions of Windows (Windows 10 and Windows 11) run on 64-bit architectures. These operating systems dropped native support for 16-bit DOS applications entirely. Clicking a raw MEDOC executable on a modern PC will simply result in an error message. 2. Missing Physical Serial Ports (COM Ports)
What (e.g., FX0, FX2N, A1S) you are connecting to Which operating system your programming PC uses What programming cable you have available
MELSEC MEDOC is the original DOS-based programming environment developed by Mitsubishi Electric for their early PLC (Programmable Logic Controller) ranges. Industrial Monitor Direct 1. Software Overview Operating System:
: Supports older FX, Q, and L series and maintains compatibility with legacy GX Developer assets. To find a working link, you generally have
The screen flickered. The red box turned amber.
MELSEC MEDOC (often referred to as MEDOC) was the industry standard for Mitsubishi PLC programming before the transition to Windows-based environments like GX Developer or GX Works. It is a robust, keyboard-driven interface that allows for ladder logic programming, monitoring, and diagnostics.
This is the most common method. By using the DOSBox emulator, you can map your PC's COM port to the emulator's interface, allowing the software to "talk" to your PLC via a serial cable (like the SC-09).