Safety Controller Display for On-Site Input Device Diagnostics
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Solution Overview
Problem
Current safety controllers in industrial settings have limited capabilities for on-site, simplified monitoring and display of information from safety input devices, making it difficult to quickly identify and address issues during emergency stops, which can lead to delays in resetting machinery safely.
Innovation Solution
A safety controller system that includes a connection unit to acquire safety input signals and state information from devices, an execution engine to generate output signals, and a display unit to show the state of safety input devices, allowing for the visualization of various pieces of information, including light reception levels, door states, and error conditions, directly on the controller or remotely through a web interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a PC is connected to the safety sensor to check settings and information, then detailed parameter checking is possible, but the interface is complex and requires multiple devices, increasing the risk of unintentional program rewriting and delaying on-site verification
Solution Approach 1:
The patent combines the safety controller and display device into a single integrated unit. The safety controller includes a display device that directly shows safety input signals and state information without requiring external PCs or interfaces. This merging eliminates the complexity of connecting multiple devices while maintaining full parameter checking capability.
Solution Approach 2:
The safety controller is designed to perform multiple functions: it processes safety input signals, generates safety output signals according to safety programs, and displays both signal states and detailed device information. This multi-functionality replaces the need for separate checking devices while simplifying the overall system interface.
2Device complexity
If only safety ON/OFF signals are monitored, then the safety controller interface remains simple, but detailed state information such as light reception levels and device conditions cannot be displayed, delaying troubleshooting
Solution Approach 1:
The display device is divided into multiple display areas that separately show different types of information: safety input signal states, safety output signal states, and detailed state information from safety input devices. This segmentation allows comprehensive information display while maintaining a clear, organized interface structure.
Solution Approach 2:
The patent adds a new dimension of information display by showing not only binary ON/OFF states but also continuous state information such as light reception levels, device temperatures, and operational parameters. This transforms the interface from simple binary indication to multi-dimensional state visualization.
3Loss of information
If external PCs are used for safety device checking, then detailed information can be accessed, but on-site verification is delayed and the risk of unintentional program modification increases
Solution Approach 1:
The safety controller performs self-verification by displaying its own safety input signals and state information directly on its built-in display device. This eliminates the need for external PCs and enables operators to quickly check device status and troubleshoot issues on-site without leaving the equipment location.
Solution Approach 2:
The display device acts as an intermediary between the safety controller's internal state and the operator. It directly presents safety input signals, output signals, and device state information in a readable format, eliminating the need for external communication interfaces and reducing troubleshooting time.
Data Source
AI summary
The present invention provides a mechanism for causing a safety controller to suitably display various pieces of information from a safety input device. A safety controller acquires a compatible port that connects at least one safety input device, and a safety input signal from the at least one safety input device connected via the compatible port and state information on the safety input device. Further, the safety controller 3 includes the MCU 23 that generates, in accordance with the safety program, a safety output signal based on the safety input signal acquired, and the display device 5a that displays, based on the state information acquired, a state of the safety input device from which the state information is acquired.