PMC (Programmable Machine Controller)

In the world of Computer Numerical Control (CNC) machining, Fanuc stands as an undisputed giant. For decades, Fanuc controllers have powered manufacturing floors, relying on a critical component known as the —the PLC (Programmable Logic Controller) within the CNC that handles machine-side functions like tool changers, coolant pumps, and safety interlocks. Before the widespread adoption of high-capacity memory cards and Ethernet, PMC programs were stored on EPROMs (Erasable Programmable Read-Only Memory) chips. To read, edit, or back up these programs, engineers needed a specialized utility: the Fanuc PMC EPROM Convert Tool . Fanuc Pmc Eprom Convert Tool

1. They read the donor EPROM with a TL866 programmer.
2. The tool identified it as an SA3 PMC with 8000 steps.
3. They converted it to .LAD and compared the ladder to a hardcopy (scanned from old documentation).
4. After verification, they burned a new EPROM (27C256) and installed it.
5. The machine booted and ran flawlessly.