Operator Station Control for Lag-Free Plant Visualization
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Solution Overview
Problem
Current control systems for technical plants using web browsers experience time lags and inconsistencies in visualization information due to the 'drag & drop' functionality, leading to graphic 'pumping' issues and divergence between the Model and View in the MVC scheme, affecting operability.
Innovation Solution
Implementing a control system where the operator station server transmits visualization information to the client, which generates revised graphical presentations and checksums, ensuring immediate response and consistency by directly adjusting the data model and graphical presentation, without violating the MVC scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operator station server transmits revised visualization information to the operator station client after processing commands, then the data model consistency is maintained, but time lags occur and graphic pumping issues arise
Solution Approach 1:
The control unit generates and transmits revised visualization information to the display unit before the operator station server completes processing and returns the information. This preliminary action allows the graphical presentation to be updated immediately, eliminating the time lag and graphic pumping effect, while the server subsequently updates the data model to maintain consistency.
2Reliability
If the web browser waits for revised visualization information from the operator station server before displaying updates, then data model consistency is ensured, but operability and user-friendliness deteriorate
Solution Approach 1:
The control unit performs preliminary generation and transmission of revised visualization information to the display unit, enabling immediate graphical updates without waiting for the server's response. This improves operability and user-friendliness while the subsequent server update ensures data model consistency is maintained.
3Ease of operation
If the graphical presentation is updated immediately without waiting for server confirmation, then operability improves, but inconsistency between the graphical presentation and data model may occur
Solution Approach 1:
The control unit generates and transmits revised visualization information to the display unit in advance, before the operator station server completes its processing. This preliminary update improves operability by eliminating visual delays, while the server subsequently updates the data model to ensure consistency between the graphical presentation and the underlying data.
Data Source
AI summary
A control system for a technical plant includes an operator station server and one operator station client, wherein a data model is implemented on the operator station server and the operator station client has display and control units, where the operator station server transmits visualization information representing the data model to the display unit that generates a graphical presentation of the received visualization information for an operator of the control system, receives commands relating to the data model from the operator and forwards them to the control unit, and where the control unit receives the commands, generates revised visualization information and transmits this information directly to the display unit to adjust the graphical presentation of the display unit, generates adjustment commands from the received commands and transmits them directly to the data model on the operator station server to adjust the data model in response to the operator commands.