Using OPC UA and MQTT to access CNC controller data

05/05/20

Industrial Ethernet Book

Use of a gateway along with OPC UA and MQTT, can provide access to S7 controller machine tool data. This allows important spindle and axis data, such as torque and power consumption, to be read out, processed and become available for condition monitoring, predictive maintenance, and data logging or analysis tasks.

Use of the uaGate 840D gateway allows access to the complete set of SINUMERIK 840D data and alarms.

TO FULLY IMPLEMENT INDUSTRIE 4.0 applications in the future, the internal data of CNC controllers needs to be available in a digitalized way. Since many machine tools, however, already have been developed years ago, these controllers often do not provide any open and standardized interface for data integration. But now, new gateway technology opens the door to external access to SIMATIC S7 controllers, as well as NC and drive data of the SINUMERIK 840D solution line.

The SINUMERIK 840D CNC controller from Siemens has been available on the market for about 25 years and is used in many machine tools for implementing milling, turning, grinding, nibbling and punching technologies. However, when checking the requirements for a future use, it turns out that only the data from the integrated SIMATIC S7 controller can be re-used outside the machine tool, while the NC and drive data is not accessible by external applications. Thus, the CNC controller prevents the integration in an overall application by not providing open and standardized communication capabilities.

Access to controller data

Access to the data in the SINUMERIK 840D sl CNC controller via the standards OPC UA and MQTT.

The uaGate 840D gateway from Softing is dealing with this challenge and, for the first time, provides access to the complete machine tool data. This allows important spindle and axis data, such as torque and power consumption, to be read out and processed using the OPC UA and MQTT communication technologies.

Together with the associated alarms, this data for instance becomes available for condition monitoring, predictive maintenance, data logging or analysis tasks. In addition, this gateway allows to generally integrate the SINUMERIK 840D sl CNC controller into Industrie 4.0 applications. This solution works with newer and older SINUMERIK 840D Solution Line versions using the NCU Type 7x0.3 and a software version newer than V4.3.

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