For decades, the sight of a FANUC control panel—with its distinct green and yellow buttons and CRT display—has been the industry standard for reliability. Operators trust these machines to hold tolerances of thousandths of an inch. But for the IT department and the data scientist, the "black box" nature of CNC controls has historically been a nightmare.
Enter FOCAS 2 (FANUC Open CNC API Specifications version 2).
While the name sounds like a software patch, FOCAS 2 is actually a comprehensive application programming interface (API) that acts as a universal translator. It allows external software—running on a PC or a cloud server—to reach inside the CNC controller, extract data, and even issue commands. It transforms a standalone machine tool into a connected node on the Industrial Internet of Things (IIoT).
using Fwlib; // Reference to FOCAS DLL// Connect to CNC at 192.168.1.100 short ret = Focas1.cnc_allclibhndl3("192.168.1.100", 8193, 1, out ushort h);
if (ret == 0) // Success ODBSYS sysinfo; ret = Focas1.cnc_rdcncinfo(h, out sysinfo); Console.WriteLine($"Connected to: sysinfo.cnc_type");
// Read Current Status (Running, Stopped, Alarm) ODBST status; ret = Focas1.cnc_rdstatus(h, out status); Console.WriteLine($"Machine State: status.status"); Focas1.cnc_freelibhndl(h); // Close connection
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.
You cannot download FOCAS 2 from a public GitHub. It is proprietary software distributed by Fanuc.
A central server polls 100+ CNCs every 2 seconds for:
Trending servo load and spindle acceleration times over weeks can detect worn bearings or lubrication issues before failure occurs.
The true power of FOCAS 2 lies in its ubiquity. Because FANUC controls dominate a massive portion of the global CNC market, software developers have built an entire ecosystem around this single API.
This has led to the rise of third-party applications that were previously impossible:
FANUC FOCAS 2 (Fanuc Open CNC API Specifications) is a powerful communication protocol and library that bridges the gap between FANUC CNC controllers and external PC applications. It allows developers to "ask" a machine for real-time data or issue commands, making it a cornerstone of modern smart manufacturing and Industrial IoT (IIoT). Core Capabilities
FOCAS 2 provides a set of Dynamic Link Libraries (DLLs) that your applications can call to interact with a CNC.
Real-Time Data Collection: Retrieve machine status (running, idle, alarm), part counts, feedrates, and spindle speeds.
Program Management: Upload or download NC programs, search for specific files, and even remotely activate or start programs.
Tooling & Offsets: Read and write tool life management data, as well as workpiece offsets.
Deep Diagnostics: Access axis positions, servo motor data, and detailed alarm text for predictive maintenance. Connection Methods
The "2" in FOCAS 2 primarily reflects its versatility in modern networking.
Gentelligent processes in biologically inspired manufacturing
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.
FANUC FOCAS 2 (Fanuc Open CNC API Specifications 2) is a specialized communication protocol and a set of library functions that enable high-level data exchange between a host computer (typically a PC) and FANUC CNC controllers. It serves as a bridge for industrial automation, allowing developers to create custom applications for real-time monitoring, data collection, and machine control. Architecture and Connectivity
FOCAS 2 is primarily composed of a set of Dynamic-Link Library (DLL) files that applications use to interact with the CNC. Communication is typically established through two main methods:
Ethernet (TCP/IP): The most common method, utilizing an embedded Ethernet port on the controller for standard network integration.
High-Speed Serial Bus (HSSB): A proprietary hardware-based connection that offers higher speeds and stability than standard Ethernet, often requiring a dedicated interface card. Core Functionality
The library allows for reading and writing a vast range of data, turning raw machine information into actionable insights. Key capabilities include:
Status Monitoring: Accessing real-time machine states such as running, idle, or alarm conditions.
Program Management: Uploading, downloading, and searching for CNC programs, as well as modifying macro programs.
Operational Data: Retrieving positional data (absolute, relative, machine), actual feed rates, and spindle speeds.
Tooling and Maintenance: Reading and writing tool life management data, tool offsets, and workpiece reference points.
Diagnostic Information: Collecting alarm history, operator messages, and waveform diagnosis data for maintenance. FOCAS 1 vs. FOCAS 2
While both libraries share similar functions, they are distinguished by their compatibility with specific CNC hardware and modern operating systems: fanuc focas 2
FOCAS 1: Targeted at legacy controls and older Windows environments (e.g., Windows 95 through XP).
FOCAS 2: Supports newer high-end controllers like the FS30i/31i/32i/35i series and modern 64-bit operating systems including Windows 10 and 11. How to Use Fanuc FOCAS to Collect Machine Data
FANUC FOCAS 2 (Fanuc Open CNC API Specifications) is a powerful application programming interface (API) that allows computer software to communicate directly with FANUC CNC controllers. It acts as a bridge, enabling real-time data collection and remote machine management by exposing the controller's internal data to external Windows-based applications. Core Capabilities of FOCAS 2
FOCAS 2 provides a library of functions for reading and writing machine data, which is essential for Industry 4.0 and IIoT (Industrial Internet of Things) implementations.
Axis and Spindle Data: Read absolute, relative, and machine positions, as well as actual feed rates and spindle loads.
Program Management: Remotely upload, download, search, and verify part programs or manage DNC (Direct Numerical Control) operations.
Maintenance & Diagnostics: Access alarm histories, operation logs, and diagnostic data to predict failures and minimize downtime.
Tool Management: Monitor and modify tool life data, tool offsets, and workpiece reference points.
PMC Interfacing: Read and write to the Programmable Machine Control (PMC) addresses, allowing software to interact with the machine’s ladder logic. Key Differences: FOCAS 1 vs. FOCAS 2
While both libraries serve similar purposes, they represent different generations of connectivity. Primary Connection HSSB (High-Speed Serial Bus) Ethernet (TCP/IP) and HSSB PC Hardware Requires a dedicated PCI/PCIe HSSB card No special hardware; works over standard LAN Network Support Point-to-point (proprietary cable) Fully routable via switches, routers, and VPNs OS Compatibility Legacy (up to Windows 7) Modern (Windows 8, 10, and 11) Controller Series Older 0i, 16i, 18i, 21i Newer 0i-F/MF and 30i/31i/32i families FANUC.FOCAS Tutorial Episode 1 What is FOCAS?
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?
The following story explores the evolution of manufacturing through the lens of FANUC FOCAS2 , the bridge between physical iron and the digital world. The Ghost in the Machine
Old Elias stood at the edge of the shop floor, his hands tucked into the grease-stained pockets of his apron. For forty years, he had "listened" to the machines. He knew the vibration of a dull end mill and the subtle whine of a spindle motor nearing its end. But the floor was changing. Beside his veteran lathes sat a row of sleek, white FANUC 31i-B
centers—machines that didn't just cut metal; they whispered data.
In the corner office, a young engineer named Sarah was staring at a monitor. She wasn't looking at blueprints. She was looking at a live feed of variables: spindle loads, thermal compensation offsets, and tool life counters.
"How do you know it's going to fail before it happens?" Elias asked, leaning against the doorframe. Sarah didn't look up. "It’s the
protocol, Elias. It’s like a digital nervous system. Every millisecond, the CNC sends its 'vitals' over the Ethernet line. I don’t have to hear the machine scream; I can see it getting a headache." The Protocol of Precision Sarah explained that while the older machines used for basic communication, these new units utilized FANUC FOCAS2 , which supported the entire modern FANUC 0i-F and 30i/31i series
via high-speed Ethernet. This wasn't just about remote monitoring; it was about total shop floor integration. For decades, the sight of a FANUC control
Through the FOCAS library, Sarah had written a small application that could: Extract Real-Time Data : Pulling exact axis coordinates and feed rates. Manage Programs : Uploading complex subprograms (M98) directly to the CNC memory without a thumb drive. Predictive Maintenance : Monitoring parameter #1420 to ensure rapid traverse rates stayed within safe limits. The Midnight Crisis
Two weeks later, at 2:00 AM, Sarah’s phone buzzed. An automated alert from the shop floor: Machine 04 – Abnormal Spindle Load Detected.
She logged in from her laptop. Through the FOCAS2 bridge, she saw that the machine was attempting to run a heavy roughing cycle, but the G43 tool length offset
seemed to be fluctuating—a sign of a loose tool holder. She hit the remote "Feed Hold."
The next morning, Elias found the machine paused. He checked the tool holder; it was exactly as the data suggested—a hairline fracture in the pull stud. If it had run for another ten minutes, the spindle would have been totaled. The New Legacy
Elias looked at the quiet machine, then back at Sarah. He realized that the "soul" of the machine wasn't just in the gears anymore. It was in the invisible packets of data moving through the PMC and CNC
"I guess the machine has two voices now," Elias said with a grin. "One I can hear, and one you can read." Sarah smiled, clicking a button to push a revised zero-return procedure
to the entire fleet. "And as long as they’re both talking, Elias, we’ll never miss a beat." of FOCAS2 functions or a guide on setting up an Ethernet connection for a FANUC controller?
Headline: Unlocking the Black Box: Why FANUC FOCAS 2 is the Unsung Hero of Modern Manufacturing
If you work with CNC machines, you know FANUC. But do you know FOCAS 2?
For years, shops treated CNCs as isolated islands—machines that cut metal but kept their data locked inside. Then came FOCAS 2 (FANUC Open CNC API Specifications version 2), and it changed the game.
What is it? Simply put, FOCAS 2 is the library that allows external software to communicate with FANUC controls (Series 0i, 16i, 18i, 30i, and 31i). It is the bridge between the proprietary world of G-code and the open world of modern software development.
Why does it matter today? In the era of Industry 4.0 and Smart Manufacturing, FOCAS 2 is the backbone of connectivity. Without it, you can’t have:
✅ Real-time Monitoring: Pulling spindle speed, feed rate, and load meter data directly to a dashboard. ✅ Machine Downtime Analysis: Automatically logging when a machine is idle vs. cutting. ✅ Digital Twins: feeding live data to simulation software to predict collisions or optimize cycles. ✅ Remote Diagnostics: Reading alarm codes from the office instead of standing at the console.
The Developer’s Perspective For the automation engineers and C#/.NET developers out there: FOCAS 2 provides a DLL (FWLIB32.DLL) and a set of C-based headers that allow you to call functions directly over Ethernet. Whether you are building a simple OEE tracker in Python or a full-scale SCADA system, FOCAS 2 is the key that unlocks the data door.
The Bottom Line If your machines are running FANUC controls but they aren't talking to your network, you are sitting on a goldmine of unused data.
Don't let your CNC be a black box. It’s time to start asking your machines what they know.
#Manufacturing #CNC #Fanuc #FOCAS2 #Industry40 #Automation #IIoT #SmartFactory
FANUC FOCAS 2 (Fanuc Open CNC API) is a specialized application programming interface (API) that allows computer software to communicate directly with FANUC CNC controllers over Ethernet or HSSB (High-Speed Serial Bus). It is the industry standard for retrieving real-time data from machine tools for monitoring, diagnostics, and automation. Key Capabilities
Data Extraction: Read/write CNC parameters, PMC signals, tool offsets, and alarm history.
Real-time Monitoring: Track machine status (Run, Hold, Alarm) and cycle times for OEE (Overall Equipment Effectiveness) calculations.
Program Management: Transfer part programs between a PC and the CNC memory.
Integration: Connects machines to third-party software like Kepware KEPServerEX or Litmus Edge for SCADA and MES applications. Core System Requirements
To use FOCAS 2, you typically need the following components installed on your host PC:
Step-by-Step: Connecting a Fanuc CNC Router via FOCAS Protocol In the race toward the "lights-out" factory and Industry 4
Using cnc_rdspindleload(), a monitoring system tracks the spindle load on a roughing operation. Over 100 parts, the baseline load is 45%. When the load rises to 62% (indicating a worn insert), the software flags the machine for maintenance before the tool breaks and scraps the part.