import ctypes import os # Define path to the FOCAS DLL dll_path = os.path.join(os.getcwd(), "Fwlib32.dll") # Load the library using ctypes try: focas = ctypes.WinDLL(dll_path) except OSError as e: print(f"Error loading FOCAS DLL: e. Check 32-bit/64-bit compatibility.") exit(1) # Configuration parameters CNC_IP = b"111.22.33.44" # Must be a byte string CNC_PORT = 8193 TIMEOUT = 10 # Seconds # Variable to hold the machine handle handle = ctypes.c_ushort(0) # 1. Connect to the CNC Machine # Function signature: cnc_allclibhndl3(ip, port, timeout, pointer_to_handle) ret = focas.cnc_allclibhndl3(CNC_IP, CNC_PORT, TIMEOUT, ctypes.byref(handle)) if ret == 0: print(f"Successfully connected! Handle ID: handle.value") # 2. Read Machine Status (Example) # Define the structure to hold statinfo data based on FANUC documentation class ODBST(ctypes.Structure): _fields_ = [ ("hdg_gno", ctypes.c_short), ("g_line", ctypes.c_short), ("g_No", ctypes.c_short), ("run", ctypes.c_short), # Status: 0=STOP, 1=HOLD, 2=START, 3=MDI, etc. ("motion", ctypes.c_short), # Motion status ("mstb", ctypes.c_short), # M, S, T, B status ("emergency", ctypes.c_short),# Emergency stop status ("alarm", ctypes.c_short), # Alarm status ("edit", ctypes.c_short) # Edit status ] status_data = ODBST() stat_ret = focas.cnc_statinfo(handle, ctypes.byref(status_data)) if stat_ret == 0: print(f"Machine Run Status: status_data.run") print(f"Emergency Stop Active: status_data.emergency") print(f"Alarm Active: status_data.alarm") else: print(f"Failed to read status info. Error code: stat_ret") # 3. Free the Machine Handle (Disconnect) focas.cnc_freelibhndl(handle) print("Disconnected from CNC.") else: print(f"Connection failed. FOCAS Return Error Code: ret") Use code with caution. Essential FOCAS Error Codes
Integrating Python with (Fanuc Open CNC API Specifications) allows you to automate data collection from CNC machines for monitoring, maintenance, and analytics. Since Fanuc does not provide official Python hooks, integration usually requires using third-party wrappers or custom implementations. Key Libraries and Tools fanuc focas python
import ctypes from ctypes import wintypes import ctypes import os # Define path to
Unlocking Industrial Data: A Comprehensive Guide to Fanuc FOCAS and Python Handle ID: handle
Because the official FANUC FOCAS library is written in C, it cannot be imported directly into Python using standard import statements. Instead, Python developers leverage the ctypes library, a built-in foreign function interface that allows Python to call functions residing in C-compatible DLLs or shared libraries. Prerequisites
: The ctypes or cffi libraries in Python allow you to call functions directly from the FOCAS Fwlib32.dll or Fwlib64.dll .
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 ).