Fanuc Focas Python Extra Quality
Do not repeatedly open and close connections ( cnc_allclibhndl3 / cnc_freelibhndl ) inside a rapid loop. This causes socket exhaustion on the CNC network interface. Open the connection once, execute your polling loops, and close it only when the script terminates.
When troubleshooting, pay attention to these frequent return codes: : Success. -15 (EW_NODLL) : DLL file not found in the path. -16 (EW_SOCKET) : Cannot connect to the specified IP or port. 1 (EW_FUNC) : The requested function is not supported by the CNC. 4. Advanced Resources GitHub Projects : Community-driven wrappers like DGN-Monitor can simplify the setup by providing pre-defined structures. Documentation
The FANUC FOCAS Python library is a wrapper around the FANUC Open CNC API, providing a Pythonic interface to interact with FANUC CNC machines. The library supports various FANUC CNC machine models, including those with the following control systems:
The machine IP must be reachable from your PC. fanuc focas python
You will need the Fwlib32.dll or Fwlib64.dll file provided by FANUC to act as the communication driver. Top Python Libraries for FANUC FOCAS
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
Want a complete ready-to-run example (Windows vs Linux, DLL names, function signatures) or a short Thread/X post? Do not repeatedly open and close connections (
The FOCAS library provides a range of functions for:
| Function Name | Description | Python Usage | | :--- | :--- | :--- | | cnc_allclibhndl3 | Opens connection to CNC. | Essential for startup. | | cnc_statinfo | Reads general status (Running, Alarm, Edit mode). | Monitoring loop. | | cnc_absolute | Reads absolute coordinates. | Tracking part progress. | | cnc_rdparam | Reads parameter values (e.g., Tool Offset, Wear). | Quality control applications. | | cnc_modal | Reads current G-code modal states (G00, G01, etc.). | Analyzing program execution. | | cnc_rdexecprog | Reads the name of the running program. | Production tracking. |
You must obtain the FOCAS DLL files (e.g., Fwlib32.dll , fwlibe1.dll ) directly from FANUC or an authorized distributor. When troubleshooting, pay attention to these frequent return
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Set reasonable timeouts in your code to prevent the script from freezing if the CNC is temporarily busy. Conclusion
: Reads actual position, speed, and load of axes pyfanuc position.
# Setup argument types for the connection function focas.cnc_allclibhndl3.argtypes = [ ctypes.c_char_p, # IP address ctypes.c_ushort, # Port ctypes.c_long, # Timeout ctypes.POINTER(ctypes.c_ushort) # Handle pointer ] focas.cnc_allclibhndl3.restype = ctypes.c_short # Returns EW_OK(0) on success