Remote control of CNC machines using the CyberOPC communication system over public networks

Remote-Tuning – Case Study of PI Controller for the First-Order-Plus-Dead-Time Systems

“…However, this technology is still under approval and there are few commercially launched devices based on this standard. The new OPC UA specifications show the path to open technologies, like XML, as a major trend in industrial systems interactivity over the Internet (Torrisi & Oliveira, 2007).…”

“…Latency of web services -Despite the advantage of high interoperability, since all SOA (Service Oriented Architecture) entities use common languages for service descriptions, messages and records of services, the use of SOA causes problems of latency and memory space related to the use of web services, and according to (Pham and Gehlen, 2005) these features can be critical depending on the application. For industrial applications where asynchronous and synchronous communication is necessary, jitter effects-in terms of delay variation between successive data packets -may occur due to high internal processing (Torrisi & Oliveira, 2007). Figure 2 shows the steps for exchanging data using web services.…”

“…Introducing the OPC cache strongly reduces the time taken to call the OPC client. Tests conducted by (Torrisi & Oliveira, 2007) showed a significant reduction for posting time optimization when compared to the gateway-based web services, such as OPC-XML and OPC-UA SOAP/XML. Steps 2, 3, and 4 represent the interaction between the CyberOPC library and the OPC layer.…”

Development of an OPC Client-Server Framework for Monitoring and Control Systems

“…A few competing protocols such as FOUNDATION fieldbus, PROFIBUS, DeviceNet, ControlNet, and Ethernet/IP can be found in automation systems [34]. Different communication solutions adopted today share a historical problem related to the fact that data from different systems may have different formats and different communication protocols.…”

“…However, current approaches are still far systematic design methods or an ultimate solution due to a late indication of changes in the production environments, a delay of the implementation of changed production plans, and changes in technology [8,38]. In addition, they have only resulted in small-scale capability or specific-applications in the domain of monitoring and control applications as studied by Eppler et al [10], Chilingargyan and Eppler [5], Jia and Li [15], Usami et al [35], Khailgui et al [17], Torrisi and Oliveira [34], Venzke et al [36], Sahin and Bolat [23], Han et al [12], Yang et al [38], Wang et al [37], etc. Three types of the data such as current data, historical data, and alarms and events are not related to others in the address space of the server.…”