Case Study Evaluation of Colorgraphics for Process Control

The complexity of modern, large-scale control systems has given rise to new requirements for monitoring and control of those systems, and capabilities of colorgraphics computer-generated display systems are being applied to provide the user/system/computer interface. An evaluation of the advanced control/display system at the 10 MWe Solar Pilot Plant was conducted to determine the effectiveness of the colorgraphics system and its impact on plant performance and operator workload. A two-phase methodology was applied to evaluate workstation design; colorgraphics display structure, content, format, and readability; control input devices; dialogue structure; display access/utilization; and alarm handling. Data collection procedures included checklist ratings, analysis of documentation, structured interviews, observation of operations, analysis of process reports, and walk-through talk-through simulation. Results indicate the overall suitability of the colorgraphics control/display system in meeting the operating requirements, and suggest discrepancy/need areas where performance improvements can be realized. Resolution of issues in three areas seems crucial to maximizing the potential of the colorgraphics interface: monitoring the process efficiently, retrieving needed information, and handling abnormal events.