Pretty Plant Picture
Figure 3: A simulated operator checks out a simulated display screen in a simulated plant in EYEsim.
Photo: Invensys Operations Management
Of course, one of the most powerful expressions of simulation are displays that go beyond copying flowcharts of processes to duplicating whole facilities on screen. However, pretty pictures aside, a useful simulator must first reproduce real-life processes and situations in great enough detail, with sophisticated enough mathematics, and with sufficient resulting dynamism to be useful to operators on the plant floor.
For example, Invensys Operations Management (www.invensys.com) recently introduced its EYEsim immersive, game-style simulator that merges first-principle simulation with augmented reality to help users see and safely interact with control room, field devices, processes and entire plants. Invensys says that control-room operators, field operators and maintenance technicians can use EYEsim to train in tandem and interactively solve problems under trained supervision (Figure 3). EYEsim is driven by Invensys' DYNSIM high-fidelity process simulator, FSIM Plus software, I/A Series control system emulation and other compatible programs.
"The increasing complexity of plants, combined with a changing workforce, demands next-generation tools that can safely and interactively train new operators and engineers without putting them, the community or the environment at risk," added Tobias Scheele, Invensys' advanced applications vice president. "This system provides a stable, realistic environment for learning routine operations and maintenance, as well as practicing rarely performed volatile tasks such as plant shutdowns. In addition, using computer models of real equipment allows endless experimentation without ever taking the equipment off-line, which also mitigates production risks."
Not Ready for Real-Time—Yet
Despite all the gains and assistance they can give to processes, simulations aren't being used to control operations or field devices directly. "Simulations use starting values to make their calculations, but we haven't reached the point where they're using real-time transmitter data," adds E-Technologies' Gerken.
Though still in the monitoring realm, one of the only substantive links between simulation and the real world is the OPC servers, which can access both real-time operations and simulators. "If you need to prove that the controls in a DCS will react properly in a given scenario, then you can have a substitute simulation engine go through OPC to the controls, look at OPC-based data, and see that the devices are responding appropriated based on what they've been told," says Kevin Wright, system consultant to ABB's Process Automation division (www.abb.com). "This is sort of like partial-stroke valve testing for software. Likewise, there have been a lot of efforts to automate and save on traditional manual testing of safety-instrumented systems, but the Catch-22 is still how to validate the validator? Eventually, it will likely be done in pieces by running an automated test procedure, recording results and then monitoring the final elements."
Jim Montague is Control's executive editor.