MTConnect for CNC Manufacturers: What It Is and Why It Matters

April 21, 2026 | 0 comments

TL;DR — Quick Answer

MTConnect explained in plain English for CNC shop owners. Learn what data it unlocks, how it compares to FANUC FOCAS, and how to check if your machines support it.

Read on for the full breakdown, comparison tables, and specific recommendations.

Your CNC machines already know everything about what they are doing — feeds, speeds, spindle load, alarm codes, program names, cycle completion. The controller is generating this data all the time. The problem is that this data disappears if it is not recorded; making it invisible to everyone except the operator standing in front of the machine. The controller is designed to create machine movement, which generates data along the way; it is not designed to keep a history of this data..

MTConnect is the key that unlocks it.

If you have heard the term used at trade shows or seen it listed on a machine spec sheet and wondered what it actually means for your shop, this guide breaks it down: clearly explaining what MTConnect is, what it does, and why it matters for CNC manufacturers.

What Is MTConnect?

MTConnect is an open, royalty-free communication standard designed specifically for manufacturing equipment. Developed by the MTConnect Institute (a nonprofit consortium of machine tool builders, software developers, and end users), it provides a common language that lets CNC machines, robots, and other equipment share data with software systems.

Think of it like USB for manufacturing data. Before USB, connecting hardware to a computer was complicated because every manufacturer used their own unique plugs, cables, communications protocols, ports, etc. Printers used parallel ports, keyboards used DIN connectors, and none of them talked to each other. USB created a universal standard, and suddenly everything could plug into everything.

MTConnect does the same thing for CNC equipment. Instead of every machine builder using a proprietary data format that only works with their own software, MTConnect defines a standard way to publish machine data so that any compatible software can read it.

The key characteristics:

Open standard: No licensing fees. Any machine builder or software developer can implement it.
Read-only by design: MTConnect streams data from the machine. It does not control the machine, which means it cannot change or interrupt machine operations. This is also important from a security perspective for an internet connected device.
XML/HTTP based: Data is served over standard web protocols, making it accessible to a wide range of software applications without custom integration work.
Semantic data model: MTConnect does not just pass raw numbers. It defines what those numbers mean: a temperature reading is labeled as a spindle temperature, a position value is labeled as an axis position, an event is labeled as a door open or a program start.

MTConnect vs. FANUC FOCAS vs. OPC-UA

MTConnect is not the only way to get data out of a CNC machine. Two other protocols come up frequently: FANUC FOCAS and OPC-UA. Here is how they compare.

FANUC FOCAS (FOCAS2)

FOCAS stands for FANUC Open CNC API Specification. It is FANUC’s proprietary protocol for accessing data from FANUC-controlled machines. If your shop uses FANUC controllers (which a large percentage of CNC machines worldwide do), FOCAS gives you access to controller-level data including axis loads, alarm history, macro variables, and program execution status.

The difference between MTConnect and FOCAS is that FOCAS is FANUC-specific. FOCUS calls generally allow surfacing a much deeper level of information than MT Connect typically supplies. FOCUS works extremely well on FANUC controllers but does not help you connect to machines that do not use FANUC, such as Siemens, Heidenhain, and Mitsubishi controls. If your shop runs different brands of equipment, you need both FOCAS (for your FANUC machines) and MTConnect or another protocol (for everything else).

OPC-UA

OPC-UA (Open Platform Communications Unified Architecture) is a broader industrial communication standard used across manufacturing, process control, and a building’s operational infrastructure. It has more capabilities than MTConnect with read-write functionality, but as a result it is more complex and comes with security risks (e.g., it can control machines, send commands, change parameters and must be carefully secured against external threats since they can write to the machine). This also means it has a higher implementation cost in the form of engineering time.

For CNC machine monitoring specifically, OPC-UA is less commonly implemented at the controller level than MTConnect. It tends to connect high-level business systems (e.g., MES, ERP, and SCADA) rather than direct monitoring of individual machines..

The Practical Takeaway

For most CNC shops, the decision is not “which one protocol do we pick.” It is “which protocol does each of our machines support?” A shop with FANUC-controlled machines uses FOCAS. Shops that have machines such as Mazak or Okuma use MTConnect. A mixed shop needs software that speaks both.

What Data Can You Actually Extract?

MTConnect and FOCAS offer access to a wide range of machine data. Here are the types of answers and information they provide:

Real-time machine status

Is the machine running a program, sitting idle, or in an alarm state?
How long has it been in each state?

Program information

What program is currently running?
What program just finished?
How long did the last cycle take versus the expected cycle time?

Spindle data

Current spindle speed (rpm)
Spindle load percentage
Spindle runtime hours (critical for preventative maintenance scheduling)

Axis and feed data

Current feed rate and overrides
Axis positions and loads
Feed override percentage (are operators dialing it down?)

Alarm and event data

Active alarm codes and descriptions
Alarm history with timestamps
Door open/close events, emergency stops, mode changes

Consumable tracking

Tool-in-use identification
Tool life counters (on capable controllers)
Coolant levels and flow rates

The raw information from a single CNC machine can generate thousands of data points per minute. However, raw data streams are fleeting and have little value on their own. For the data to be useful requires software that translates the information into an accessible format and provides historical, actionable insights.

Why Aren’t Most CNC Shops Using It?

If MTConnect has been around since 2008 and the data is this valuable to CNC shops, why has widespread adoption been slow?

The answer is not hardware related. Most modern CNC controllers either ship with MTConnect built in or can be retrofitted with an adapter at modest cost.

The answer is that no one has clearly explained the value. And entry points to get started monitoring your shop used to be a lot higher.

The MTConnect standard itself is documented in engineering language written for software developers and protocol implementers. Trade show demos tend to focus on the technology — data streams, XML schemas, adapter configurations — rather than the business outcome.

Shop owners and plant managers do not need to understand XML. They need to understand that their machines are already generating the data required to answer questions such as:

Which machine has the most idle time between shifts?
How does actual cycle time compare to quoted cycle time?
How often are operators overriding feed rates, and on which jobs?
What was happening on Machine 3 at 2:47 AM when the alarm triggered?

These are business questions, not technology questions. MTConnect is simply the pipeline for the data. Osync^® was built to read that raw data and reveal the answers to those questions in the form of user-friendly dashboards, productivity metrics, and event timelines that make sense to a plant manager, not just a software developer.

How to Check If Your Machines Are MTConnect-Compatible

If you are wondering whether your existing machines can connect, here is a practical checklist:

Step 1: Check the controller generation. Many CNC controllers manufactured after 2010 either include MTConnect support natively or can be upgraded. FANUC 30i/31i/32i, Mazak MAZATROL SmoothX, Okuma OSP-P300, and Siemens SINUMERIK 840D are all examples of controllers with connectivity options. PC-based controls, however, usually do not support standards such as MTConnect natively.

Step 2: Ask your machine builder or distributor. This is the simplest path. Contact the machine manufacturer and ask: “Does this controller support MTConnect? What adapter or license is required?” Many builders offer connectivity packages as standard or optional equipment.

Step 3: Check for an Ethernet port on the controller. If your machine has a network connection on the controller (not just for DNC file transfer), it likely has the hardware foundation for MTConnect or FANUC FOCAS connectivity. Software configuration or an adapter may still be needed, but the physical infrastructure is in place.

Step 4: Consider retrofit adapters. For older machines without native protocol support, physical adapters, such as Osense™, can add basic connectivity by reading machine power, I/O signals, or vibration data. The data depth is not as rich as a native controller connection, but even basic status monitoring (running, idle, off) provides value.

From Raw Data to Actionable OEE Metrics

Turn that raw data into metrics you can act on.

The standard OEE (Overall Equipment Effectiveness) framework breaks machine performance into three components:

Availability: What percentage of scheduled production time is the machine actually running?
Performance: When the machine is running, is it running at the expected speed?
Quality: Of the parts produced, what percentage were first-time-right?

MTConnect and FOCAS data relates directly to the Availability and Performance components. The machine knows when it is cutting, when it is idle, and what speed it is running. Quality data typically requires additional input (inspection results, scrap counts), but two-thirds of the OEE equation can be populated automatically from the controller data stream.

For more information about OEE, see: https://www.osync.ai/blog/what-is-oee-complete-guide/

Osync’s Universal Approach

Osync solves the multi-protocol reality of a modern shop. Rather than supporting only one connectivity standard, Osync integrates with:

Any MTConnect-compatible machine — routers, machining centers, lathes, and other equipment from any manufacturer that supports the standard
Any FANUC Focus (FOCAS) controlled machine — deep controller-level access to the full FANUC dataset
All C.R. Onsrud machinery — native integration with controller logic that goes beyond standard protocol data
All additional three-phase powered equipment — tracks simple on, off, running states to give productivity metrics of legacy machines, vacuum pumps, edge banders, saws, dust collectors, etc.

This universal connectivity means you do not need to choose a monitoring platform based on what machines you own today. A shop running FANUC-controlled C.R. Onsrud routers alongside MTConnect-compatible machining centers from another builder can see the entire floor on a single dashboard.

Translating the raw data from CNC platforms, Osync provides the root cause analysis, maintenance scheduling, and OEE tracking — all in one platform. It offers valuable features such as the Preventative Maintenance Manager and Machine Replay which preserves a second-by-second controller log for every event. Additionally, it provides a real-time single view into all your shop equipment.

Learn more about Osync’s connectivity and pricing at osync.ai/pricing/

Frequently Asked Questions

What is MTConnect?

MTConnect is an open, royalty-free communication standard for CNC machines. It allows machines from different manufacturers to stream data in a common format — enabling monitoring, analytics, and integration with software systems.

Does my CNC machine support MTConnect?

Most modern CNC machines with FANUC, Siemens, or Haas controllers support MTConnect either natively or through an adapter. Older machines may require an MTConnect adapter bridge. Most PC-based controllers, however, will not support MTConnect or other standard protocols natively.

Is MTConnect free?

Generally machinery builders charge a fee for the MT Connect Adapter — which is the piece of software that monitors what the machine is doing and outputs the datastream for a monitoring software to read. Monitoring software usually requires a subscription fee to process, store, and present data, transforming the information into actionable business insights. Without this, you would have a live stream of raw data that disappears instantly.