A conversion tool isn't just a "nice to have"; it is a critical asset for legacy machine support. Here is why:
These are physical devices that read the EPROM and save a .BIN or .HEX file to a USB drive or PC.
Most machine builders ship controls with the PMC stored on EPROMs. Without the source files, you cannot directly edit the ladder. The conversion tool lets you: Fanuc Pmc Eprom Convert Tool
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.
While specific steps vary by Fanuc software version, the typical workflow is: A conversion tool isn't just a "nice to
Step 1: Read the EPROM
Use a hardware EPROM programmer (e.g., Data I/O, Needham’s, or a TL866) to read the physical 27C256, 27C512, or similar chip. Save the file as machine.BIN.
Step 2: Convert Binary to Mnemonic Open the Fanuc PMC EPROM Convert Tool. Select File → Convert → Binary to Mnemonic. Step 3: Edit the Logic Open the
Step 3: Edit the Logic
Open the .MNQ file in any text editor (Notepad++ works well) or import it into Fanuc FAPT Ladder. Add your desired changes. Warning: A single misplaced contact can crash the machine. Validate carefully.
Step 4: Convert Back to Binary Run the tool again: Mnemonic to Binary.
Step 5: Program & Test
Use your EPROM programmer to burn new_machine.BIN onto a new EPROM (never overwrite the original without keeping a backup). Install the new EPROM and test the machine in a controlled environment.
Most legacy machines have no backup of the PMC ladder. If the EPROM fails, the machine becomes a paperweight. Converting the EPROM to a digital file allows for cloud storage and instant recovery.