Fanuc Focas Python May 2026

1. The 32-bit vs 64-bit Trap If you get OSError: [WinError 193] %1 is not a valid Win32 application, you are running 64-bit Python against a 32-bit DLL. You must reinstall Python 32-bit (x86).

2. The "Handle" Mystery The handle h is a short (integer). If you get -8 or -16 errors, check: fanuc focas python

3. Library Version Mismatch Older Fanuc controllers (18i, 16i) use focas1.dll. Newer ones (30i) use focas2.dll. The Python wrapper must match the DLL functions (e.g., cnc_allclibhndl3 vs cnc_allclibhndl). Network: The CNC must have an Ethernet option

Before writing code, you need the FOCAS libraries. fwlib.cnc_allclibhndl3.argtypes = [ ctypes.c_char_p

  • Network: The CNC must have an Ethernet option enabled, and your PC must be on the same subnet as the machine.

    • fwlib.cnc_allclibhndl3.argtypes = [ ctypes.c_char_p, # IP address ctypes.c_ushort, # Port ctypes.c_long, # Timeout ctypes.POINTER(cnc_handle) ] fwlib.cnc_allclibhndl3.restype = ctypes.c_short