Alarm Trend Summary Display for DCS Operator Flood Management
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Solution Overview
Problem
Current process control alarm systems in factory automation face challenges with alarm floods, where operators receive a high volume of alarms within a short period, making it difficult to recognize and respond to abnormal situations effectively, as existing systems do not adequately support operators in managing these floods.
Innovation Solution
An improved alarm trend summary display system and method that organizes alarms in a top-to-bottom list with right-to-left horizontal arrangement, using icons, gray bands, and tool tips to highlight active alarms, allowing operators to visualize alarm sequences, priorities, and relations, aiding in coping with alarm floods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional alarm summary lists are used to display all alarms, then complete alarm information is provided, but operators cannot effectively process alarm floods due to information overload
Solution Approach 1:
The alarm display is segmented into two distinct views: an alarm summary list showing current active alarms and an alarm trend list showing historical alarm sequences. This segmentation allows operators to view complete alarm information across both displays while focusing attention on specific alarm patterns in the trend view, preventing information overload.
Solution Approach 2:
The alarm trend list adds a temporal dimension to alarm display by showing alarms in chronological sequence from right (most recent) to left (oldest). This transforms the traditional single-dimension alarm list into a two-dimensional view that includes time progression, enabling operators to recognize alarm patterns and sequences that were invisible in traditional displays.
2Reliability
If alarm indicators are arranged to show chronological sequence, then alarm patterns become visible, but display complexity increases
Solution Approach 1:
Different regions of the display serve different functions: the alarm summary list provides current status with simple vertical arrangement, while the alarm trend list provides historical context with horizontal chronological arrangement. Each region has optimized layout characteristics suitable for its specific purpose, reducing overall complexity while improving pattern recognition.
Solution Approach 2:
Instead of listing alarms from oldest to newest (traditional approach), the alarm trend list displays alarms from most recent (right side) to oldest (left side). This inverted chronological arrangement allows operators to immediately see the most current alarm status and work backward through the sequence, improving response time while maintaining pattern visibility.
3Loss of information
If more alarm details are displayed simultaneously, then comprehensive alarm monitoring is achieved, but operator cognitive load increases during alarm floods
Solution Approach 1:
The alarm trend list pre-processes alarm information by automatically arranging alarms in chronological sequence and highlighting active alarms. This preliminary organization of data reduces the cognitive effort required during alarm floods, as operators receive pre-processed, easily interpretable information rather than raw alarm data requiring manual analysis.
Solution Approach 2:
The system uses color coding to indicate alarm status: active alarms are highlighted in yellow in the alarm trend list and correspondingly highlighted in the alarm summary list. This visual differentiation allows operators to quickly identify which alarms require immediate attention without reading detailed information, reducing cognitive load while maintaining comprehensive monitoring.
Data Source
AI summary
An alarm trend summary display system and method can utilize an alarm trend list that works together with an alarm summary list. A set of rows in the alarm trend list can be organized in a top-to-bottom manner. A set of alarm indicators within each row in the alarm trend list can be arranged in a right-to-left horizontal arrangement. The set of alarm indicators can be aligned with most recent alarms appearing on a right side of the alarm trend list. The specific alarm indicators can be selected in the alarm trend list, so that a corresponding item can be highlighted in the alarm summary list, if the alarms are active. Hence, the system and method can allow an operator to see when alarms occur, their sequence, relations and priority, which aid the operators cope with inevitable alarm floods.