The OPC DataHub Simplifies OPC Connections
Javeriana University- Colombia
Nestled among a rich diversity of flora and fauna in the Andes plateau, on the outskirts of Cali, sits the Javeriana University, headquarters of the oldest system of higher education in Colombia. Engineering students at the Javeriana University augment their rigorous academic studies with a strong tradition of hands-on research.
Over the past several years, graduate students in several Research Groups: Automation and Robotics, Cleaner Production, and Thermodynamic Fluids Modeling have developed three different factory process simulators. Small in size and relatively basic in design, this equipment is sophisticated enough to help classes of students gain the understanding and skills they need to pursue careers in a variety of industries. The next stage of this project is to link these simulators to a SCADA system, which will enrich the students’ experience of industrial automation.
Recently, graduate students Andres Mora and Juan Guillermo Botero have been using Rockwell's FactoryTalk View SE Studio to design a SCADA system for the project. The three simulated plants are connected by ethernet to a single Unitronics OPC server, and the plan was to then connect that to the SCADA system's OPC client.
“We had hoped to make a simple OPC server-client connection,” said Andres. “But we ran into an unexpected problem. The Unitronics server doesn't support tag browsing, and as far as we know, the only way the Rockwell software can access the tags is by browsing for them. So, when trying to look for the tags in FactoryTalk View Studio, you cannot access them from the OPC server. We aren't sure why this is so, and there may be a work-around, but we needed a way to make a simple, robust connection.”
To solve the problem, Andres and Juan Guillermo searched the Internet for a tool that can act as an OPC server and OPC client simultaneously, and that has sufficient configuration options to support a connection to their SCADA system. They found the OPC DataHub, and discovered that it could do exactly what they needed.
“With the OPC DataHub, we were able to directly access the tags delivered by the Unitronics OPC server,” said Andres, “and since the OPC DataHub does support tag browsing, FactoryTalk View Studio was then able to browse the tags that OPC DataHub provides. It took a few minutes to configure, and we had our connection up and running.
“This is Stage One of a bigger project,” continued Andres. “We expect it to run for at least another year. During that time undergraduate students will be using the system for lab assignments and other projects. The OPC DataHub just runs in the background, giving us a consistent, reliable connection. It has been very helpful in allowing the project to move forward smoothly and quickly.”
OPC DataHub is a trademark of Cogent Real Time Systems. Software Toolbox is a trademark of Software Toolbox, Inc.