In the race toward the "lights-out" factory and Industry 4.0, data is the new oil. For manufacturers using CNC machine tools, the single greatest bottleneck to digital transformation isn't hardware—it's communication. How do you extract real-time data from a 20-year-old machining center? How do you send a new program to 50 machines simultaneously without a USB stick?
The answer, for the vast majority of the global manufacturing floor, lies in Fanuc FOCAS 2.
If you are a manufacturing engineer, an MES developer, or an IT manager in a machine shop, understanding FOCAS 2 is no longer optional. It is the key to unlocking visibility, predictive maintenance, and autonomous operation.
FOCAS2 (Fanuc Open CNC API Specification, version 2) is Fanuc’s communications protocol and API for accessing and controlling Fanuc CNC controllers over Ethernet. It provides functions for reading/writing variables, file transfer, PLC data access, program management, and machine status/diagnostics — enabling integration, monitoring, and automation tools.
If you want a language-specific example (Python, C#, or C) or a checklist tailored to a specific Fanuc controller model, tell me which language or model and I’ll provide code and command sequences.
(Invoking related search terms.)
FANUC FOCAS2 (FANUC Open CNC API Specifications) is a set of library files (DLLs) designed for developers to create custom Windows applications that communicate directly with FANUC CNCs via Ethernet or High-Speed Sub-Board (HSSB)
Here is a detailed breakdown of a key feature of the FOCAS2 library.
Featured Function: Real-time CNC Program Management & Data Exchange
FOCAS2 provides a robust API for bi-directional communication, allowing external software to read data from and write data to the CNC. A primary feature is its ability to handle CNC programs and machine parameters in real-time. Remote Program Operations:
You can use FOCAS2 to upload, download, search, delete, and verify CNC programs directly from a computer. This allows for automatic program loading based on a production schedule. DNC Operation:
The library supports DNC (Direct Numerical Control) operations, allowing a PC to feed program data to the CNC in real-time. Parameter/Offset Writing:
FOCAS2 allows for writing tool offset data, workpiece reference point offsets, parameters, settings, and custom macro variables. Advanced Data Reading:
Beyond writing, it reads absolute/relative/machine positions, remaining distance to go, actual feedrate, tool life management data, and spindle data. Key Functions for this Feature: cnc_rdzofs : Read work zero offset value. cnc_wrfixofs : Write fixture offset values. cnc_wrmacror2 : Write custom macro variables. cnc_wrpdf_line : Write data to the CNC program. Application Scenario:
A developer can use C# and the FOCAS2 library to create a custom dashboard that monitors tool life ( cnc_rdtofsinfo2 ). When a tool reaches 95% usage, the application can use cnc_wrfixofs to update offsets and cnc_wrpdf_line
to update the active program to a "sister tool" without operator intervention. Core Advantages of FOCAS2 Direct Connectivity: fanuc focas 2
No additional hardware adapters are needed; it works through standard Ethernet on Modern FANUC controls like the 0i-F or 30i series. High Performance:
Designed to support high-speed monitoring and complex automation tasks. Customization:
Enables the development of bespoke Windows® applications tailored to specific machine tool builders or end-user needs. cnc_wrmacror2 | Ncdata | Fanuc Focas Library - inventcom
FANUC FOCAS 2 (Fanuc Open CNC API Specifications 2) is a specialized communication protocol and set of library files designed to bridge the gap between high-performance FANUC CNC controllers and external PC-based applications. As the industry-standard gateway for industrial data collection, FOCAS 2 enables manufacturers to monitor machine status, collect production data, and even control CNC operations in real-time. Core Capabilities and Functions
The FOCAS 2 library is a collection of Dynamic Link Libraries (DLLs) that allow developers to access nearly all internal CNC and PMC (Programmable Machine Control) data.
Machine Monitoring: It provides real-time access to running status, feed rates, spindle speed, motor data, and active alarms.
Axis and Motion Data: Users can read absolute, relative, and machine positions, as well as remaining distance to go.
Program Management: The protocol supports the uploading, downloading, searching, and activation of part programs.
Maintenance and Diagnostics: It can retrieve operation history, alarm history, and servo/spindle diagnostic data for predictive maintenance.
Customized Logic: FOCAS 2 allows for the creation of customized functions, including the ability to modify macro programs directly from a Windows application. The Evolution: FOCAS 1 vs. FOCAS 2
While both protocols serve the same primary goal, they represent different generations of connectivity: FANUC.FOCAS Tutorial Episode 1 What is FOCAS?
Unlocking the Brain of your Machine: A Guide to FANUC FOCAS 2
If you’ve ever wanted to "talk" to your CNC machine—not just read the screen, but actually pull data into a custom app or monitor it remotely—you’ve likely heard of FANUC FOCAS 2
Think of FOCAS (Factory Automation Computer Aided Engineering Support) as a backstage pass to your FANUC CNC controller’s brain. It’s an API (Application Programming Interface) that allows your software to interact with the machine in real-time, bypassing the need for complex hardware or manual data entry. What is FOCAS 2?
FANUC FOCAS is a set of library files (DLLs) that act as a translator. While FOCAS 1 was the standard for older CNC models, In the race toward the "lights-out" factory and Industry 4
is the modern version designed for newer controllers and compatible with recent operating systems like Windows 10 and 11. It enables two main types of communication:
The most common method, allowing you to connect via your shop floor’s standard network. HSSB (High-Speed Serial Bus):
A specialized, ultra-fast fiber-optic connection for high-performance data exchange. Why Use It? Modern manufacturing is all about data. By using the FOCAS2 Library , you can build custom applications to: Monitor Performance: Track part counts, cycle times, and idle status. Manage Programs:
Upload or download G-code and even modify macro programs remotely. Maintenance Alerts:
Pull diagnostic data to catch tool wear or mechanical issues before they cause downtime. Smart Factory Integration:
Connect your machines to IoT platforms for full-shop visibility. How to Get Started
To build an application using FOCAS 2, you typically follow these steps:
Unlocking the Power of FANUC FOCAS 2: A Comprehensive Guide
In the world of industrial automation, FANUC is a name that commands respect and admiration. The Japanese multinational company has been a pioneer in the field of robotics, CNC systems, and automation solutions for decades. One of its most popular and widely used products is FANUC FOCAS 2, a powerful and versatile interface that enables seamless communication between FANUC CNC machines and external devices. In this article, we will delve deep into the world of FANUC FOCAS 2, exploring its features, benefits, and applications in the industry.
What is FANUC FOCAS 2?
FANUC FOCAS 2 (FANUC Open Architecture and Communications) is a software library developed by FANUC to facilitate communication between its CNC machines and external devices such as computers, PLCs, and other machines. FOCAS 2 is an extension of the original FOCAS library, offering enhanced functionality, improved performance, and increased reliability.
The FOCAS 2 library provides a set of APIs (Application Programming Interfaces) that allow developers to create custom applications, enabling the exchange of data between FANUC CNC machines and external devices. This enables users to integrate their FANUC machines with other systems, creating a more streamlined and efficient production environment.
Key Features of FANUC FOCAS 2
FANUC FOCAS 2 offers a range of features that make it an attractive solution for industrial automation applications. Some of the key features include:
Benefits of Using FANUC FOCAS 2
The benefits of using FANUC FOCAS 2 are numerous, and can be summarized as follows:
Applications of FANUC FOCAS 2
FANUC FOCAS 2 has a wide range of applications in the industry, including:
Conclusion
FANUC FOCAS 2 is a powerful and versatile interface that enables seamless communication between FANUC CNC machines and external devices. With its high-speed data transfer, multi-protocol support, and CNC machine access, FOCAS 2 is an ideal solution for industrial automation applications. By providing valuable insights into machine performance and production data, FOCAS 2 enables users to optimize production processes, improve productivity, and reduce costs. Whether you're a manufacturer, machine builder, or system integrator, FANUC FOCAS 2 is definitely worth considering for your next automation project.
Technical Specifications
FAQs
Additional Resources
By providing a comprehensive overview of FANUC FOCAS 2, its features, benefits, and applications, we hope to have provided valuable insights into the world of industrial automation. Whether you're a seasoned automation professional or just starting out, FANUC FOCAS 2 is definitely worth considering for your next automation project.
First, let's decode the acronym. FOCAS stands for Fanuc Open CNC API Specification.
Originally released as FOCAS1 (Library for CNC), the evolution to Fanuc FOCAS 2 represented a seismic shift. FOCAS 2 is the dynamic link library (DLL) and protocol set that allows external computers (PCs, servers, edge devices) to communicate directly with Fanuc CNCs (Series 0i, 15i, 16i, 18i, 21i, 30i, 31i, 32i, and Power Motion i) via standard Ethernet.
Think of FOCAS 2 as the "universal translator" for your machine tools. It bridges the gap between the low-level, real-time CNC memory and high-level languages like C++, C#, Python, or VB.NET.
Instead of using old RS-232 serial cables, an MES system pushes new part programs to CNC memory or a data server via FOCAS 2 file transfer functions (cnc_upload, cnc_download).
| Feature | FOCAS 2 | MTConnect | OPC-UA (on FANUC) | |---------|---------|-----------|--------------------| | Data model | Flat functions | Hierarchical XML/JSON | Object-oriented | | Push capability | No (polling) | No (polling) | Yes (Pub/Sub optional) | | Security | None (use IP allowlist) | Basic (HTTP auth) | Certificate + encryption | | Setup complexity | Low (library + port) | Medium (agent config) | High (certificates + models) | | Real-time position | Yes (≤50ms) | Limited by HTTP overhead | Yes |
FOCAS 2 is a library (DLLs for Windows, shared objects for Linux) that allows external applications to communicate directly with FANUC CNCs over Ethernet (or HSSB). It provides read/write access to CNC data: macro variables, offsets, programs, alarms, status, tool data, and more. Benefits of Using FANUC FOCAS 2 The benefits
| Feature | FOCAS 2 | MTConnect (FANUC) | Manual B‑register reading | |----------------------------------|----------------------------|---------------------------|----------------------------| | Real‑time data rate | Very high (10–100 ms) | Low–medium (500 ms+) | Slow, operator‑dependent | | Write to CNC | Yes (programs, variables) | Typically no | No | | Setup complexity | High (library + network) | Medium (agent config) | Low (but manual) | | Requires CNC option license | Yes (FOCAS enabled) | Sometimes also requires it | No | | Security | None (plaintext) | Basic (HTTP) | N/A |