MTConnect Moves Ahead
MTConnect is a machine tool communication standard being developed by AMT—The Association For Manufacturing Technology ( www.amtonline.org ). It’s reaching a critical point in its progress. It will soon need some “early adopters” who will embrace the concept, apply it to their products, champion the cause to other
MTConnect is a machine tool communication standard being developed by AMT—The Association For Manufacturing Technology (www.amtonline.org). It’s reaching a critical point in its progress. It will soon need some “early adopters” who will embrace the concept, apply it to their products, champion the cause to other vendors and promote its benefits to end users. This news is from Paul Warndorf, AMT’s VP of technology, who visited the offices of MODERN MACHINE SHOP recently.
MTConnect is designed to establish specifications for formatting and transmitting data generated by a CNC unit on a machine tool or by other types of automated factory equipment. The concept is simple. Control builders who want to make data such as part counts, cycle times, logs of spindle conditions and so on available to external applications can facilitate this connection by complying with the MTConnect standard. This means tagging and formatting the data according to the rules of the standard. Likewise, software developers with applications that could use this data can adapt their programs to accept it in the MTConnect format. The tags allow the data generated by the control to be located, identified and processed by the developers’ software. Developers are free to analyze and present the data in any form that they believe shops will find useful.
The benefit to end users such as shop owners and plant managers is “plug and play” compatibility. Let’s say a plant has 10 different types of control units on the machine tools out in its shop. To keep track of their performance, managers there want to install a machine monitoring system. For now, the supplier of this system may have to prepare 10 different software interfaces in order to get the machines connected with the new system. The various control unit builders may have to get involved, too, if modifications inside the CNCs are needed.
MTConnect seeks to solve this problem. If both the machine tool and the software application follow MTConnect, as the concept goes, then they are ready to be connected. The control builder has to create only one interface to get data out to any compliant software application, and the software developer has to create only one interface to extract data from any compliant machine tool. Whose make of CNC or brand of software it is shouldn’t matter. This is called “interoperability” in computer circles.
According to Warndorf, the MTConnect development team has settled on XML for these common interfaces. XML is the format used to move numerical data across the Internet, so MTConnect will ensure compatibility with Web-based networking. The next step is to establish what types of data will be covered initially by the standard and to agree on “words” for tagging the different types. Additional “words” can be added later, thus allowing the standard to grow and develop as needed (it’s “extensible,” as they say.) Once the initial set of words is established, control builders and software developers can start on their interfaces.
Warndorf says the plan is to have demos of the standard in action at IMTS 2008. He’d like to see some big-names among the machine tool companies, control builders and software developers give a high priority to implementing the standard, now that it is this far along. That would give this initiative the momentum it needs to stay on target for the IMTS demos and ultimately to attract widespread adoption of the MTConnect specifications. Overcoming today’s obstacles to communicating readily with machine tools is seen as an important step to streamlining production and making U.S. manufacturing more globally competitive.For a white paper from AMT on MTConnect, go to http://www.amtonline.org/document_display.cfm?document_id=56744
A panel discussion at the recent Top Shops Conference focused on various points of view regarding the value of connecting machine tools to a network for monitoring performance and recording results. Because machine monitoring helps a shop make better decisions about manufacturing processes, it is a good example of data-driven manufacturing in action.
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While OPC UA and MTConnect are both http-based protocols, there are differences between them, and each is best used in differing scenarios.