Supervisory Control Screen for Fast Shutdown Cause Diagnosis
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Solution Overview
Problem
Existing control systems face challenges in quickly identifying the cause of unintended system shutdowns, as the support device is often not connected to the control device during facility operations, leading to increased time and effort in diagnosing issues.
Innovation Solution
A control system configuration that allows for the generation and display of supervisory control screens on a display device without connecting the support device to the controller, using input-output correspondence information to identify the cause of system shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the support device is connected to the controller for diagnosing system shutdowns, then accurate cause identification is possible, but the time required for diagnosis increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the display device with the ability to display supervisory control screens showing input-output signal relationships before a shutdown occurs. This allows operators to quickly view the state of input signals and output signals without needing to connect the support device, thereby reducing diagnosis time while maintaining accurate cause identification through the pre-established display capability
2Productivity
If the support device is not connected to the controller during facility operations, then system operation is uninterrupted, but the ability to quickly diagnose shutdowns is reduced
Solution Approach 1:
The patent applies self-service by enabling the display device to independently display supervisory control screens with input-output signal information without requiring connection to the support device. The display device itself possesses the capability to show the necessary diagnostic information, eliminating the need for external support device connection and allowing operators to perform self-diagnosis quickly while maintaining facility operation continuity
3Ease of operation
If detailed input-output correspondence information is displayed on the supervisory control screen, then cause identification becomes easier, but the device complexity increases
Solution Approach 1:
The patent applies the taking out principle by extracting and displaying only the essential input-output correspondence information needed for shutdown diagnosis on the supervisory control screen. Rather than displaying all possible system parameters, the system selectively presents the specific input signal states and output signal relationships that are most relevant for identifying shutdown causes, thereby improving ease of operation without significantly increasing device complexity
Data Source
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AI summary
The control system includes a support device used for developing a user program to be executed on a controller, and a display device that provides a supervisory control screen by referring to information held by the controller. The support device includes a generation means that extracts a relationship between an output signal and one or more input signals defined by the user program and generates input-output correspondence information, and a transmission means that transmits the input-output correspondence information or screen data reflecting the input-output correspondence information to the display device. The display device provides, on the basis of the input-output correspondence information or the screen data reflecting the input-output correspondence information, the supervisory control screen showing the current value of a selected output signal and the current value of one or more input signals associated with the output signal by referring to the values of input and output signals held by the controller.