Fanucprg.bin ((exclusive))

(using ftplib for FANUC 31i):

| File Extension | Purpose | Human Readable? | | :--- | :--- | :--- | | .BIN | Full SRAM image | No | | .LAD | Ladder logic (PMC) | No (requires FANUC Ladder III) | | .DF / .DAT | Tool data / custom macros | Partial | | .NC / .MIN | Individual part program (G-code) | Yes | | .SV | Servo configuration data | No | Fanucprg.bin

from your CAM library (e.g., Mastercam, Fusion 360, or PowerMill). File Extensions: Output files as . The machine will "import" these into the BIN container. Program Size: Since the BIN file can handle up to (using ftplib for FANUC 31i): | File Extension

from ftplib import FTP ftp = FTP('192.168.1.101') ftp.login('anonymous', '') ftp.cwd('/MDMCARD/') with open('Fanucprg_backup_2025.bin', 'wb') as f: ftp.retrbinary('RETR Fanucprg.bin', f.write) ftp.quit() print("Backup complete.") The machine will "import" these into the BIN container

For large shops with 10+ FANUC machines, manual backups are impractical. Use FTP scripting:

Never attempt to delete Fanucprg.bin from the live system. Doing so while the controller is running will immediately clear all part programs and offsets.