Fanuc Pmc Eprom Convert Tool — !new!
The tool provides a simple, two-function approach that mirrors the two directions of the data conversion process. It typically consists of two executable files: and FNC2.EXE .
Select the appropriate EPROM type and series, which corresponds to the physical chip removed from the Fanuc board (e.g., 27C256, 27C512). Load the File: Load the raw binary file created in step 1.
Older systems often split PMC data across multiple physical EPROMs (e.g., Odd and Even bytes, or High and Low memory banks). The tool automatically splits a unified PC file into separate files for burning, or merges multiple chip dumps back into a single file.
Many older machines have lost their hard-copy schematics. A conversion tool allows you to reconstruct the ladder logic from the machine itself. Supported Fanuc Systems and EPROMs
Start a new project matching the exact CNC control model and PMC type (e.g., PMC-M, PMC-N, PMCQ). Fanuc Pmc Eprom Convert Tool
In industrial automation, maintaining legacy CNC machinery is a constant challenge. Fanuc CNC controls from the 1980s, 1990s, and early 2000s—such as the Fanuc 0, 15, 16, 18, and 21 series—rely on Programmable Machine Control (PMC) ladders stored on physical EPROM chips. When these legacy machines require logic updates, or when parts fail, engineers must convert, read, and rewrite these old chip formats into modern digital equivalents.
: Eliminates the need to manually trace wires or "read" the ladder on the tiny CRT screens of old machines.
Before inserting an EPROM into a reader, ensure you have a backup of the read file.
| Feature | Why It Matters | | :--- | :--- | | | Supports SA1, SA2, SA3, SB3, SB4, SC, SD, SE, etc. | | EPROM Dump Verification | CRC-16 or checksum validation to catch read errors. | | Bidirectional Conversion | EPROM → Ladder AND Ladder → EPROM binary. | | Export to Legacy Floppy/RS-232 | For older controls that cannot use USB. | | Symbol & Comment Preservation | Many old EPROMs had no symbols, but some tools can add them post-conversion. | | Batch Processing | Critical for machine builders converting dozens of EPROMs. | The tool provides a simple, two-function approach that
What is the you are extracting from?
To modify a ladder on an old PMC (e.g., PMC-L or PMC-M), you previously needed a FANUC Handy File or a PROM writer. Convert tools allow you to disassemble the EPROM image into a standard KLC or LAD file for editing on a PC.
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For EPROMs soldered to the board (common in FANUC Series 0 Mate), an ISP tool clips onto the chip without desoldering. Load the File: Load the raw binary file created in step 1
Older controls use functional blocks (SUB codes) that are deprecated or handled differently in newer controls. You must manually update these specific rungs using the LADDER-III error log as your guide. Summary of Best Practices
Before trusting the conversion, verify the checksum:
: Splitting or joining data files for specific control series (e.g., Fanuc 0, 15, and 16/18). Step-by-Step: How to Use the Tool Using the tool generally follows this workflow: