Safety Detector Wiring for Emergency Stop Loop Integration
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Solution Overview
Problem
Safety detectors with autonomous operation, lacking a safety logic block, face complexity in integrating an emergency stop function due to limited electrical terminals, making it difficult to connect an emergency stop device without compromising existing functionalities.
Innovation Solution
A safety detector design that includes a test module and specific wiring configuration allowing for the integration of an emergency stop device using existing eight terminals, with a control and processing unit managing the emergency stop functionality and start loop monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an emergency stop device is integrated into a safety detector with autonomous operation, then the safety functionality is improved, but the device complexity increases due to limited electrical terminals
Solution Approach 1:
The patent applies multi-functionality by enabling the safety detector to perform both its original safety monitoring function and the additional emergency stop function using the same eight electrical terminals. The control and processing unit manages multiple functions including reading control signals, managing start loops, and handling emergency stop inputs without requiring additional terminals, thus resolving the contradiction between improved safety functionality and device complexity
Solution Approach 2:
The patent merges the emergency stop device with the safety detector by integrating the emergency stop functionality into the existing terminal structure. The first and second control inputs are configured to receive signals from emergency stop devices, and the control and processing unit combines the processing of emergency stop signals with start loop monitoring and safety output management, thereby improving safety functionality while avoiding increased device complexity
2Adaptability or versatility
If additional terminals are added to accommodate an emergency stop device, then the adaptability is improved, but the system size increases
Solution Approach 1:
The patent makes the existing eight terminals universal by configuring them to handle multiple functions: the first control input and first control output manage the start loop, while the second control input and second control output handle emergency stop signals. This multi-functional configuration improves adaptability without increasing system size, as no additional terminals or physical components are required
3Reliability
If a safety logic block is added to manage emergency stop functionality, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the emergency stop management function with the existing control and processing unit, eliminating the need for a separate safety logic block. The control and processing unit is configured to read control signals from emergency stop devices connected to the second control input, process these signals alongside start loop monitoring, and generate appropriate safety outputs. This integration improves reliability for emergency stop management while avoiding the increased device complexity that would result from adding a separate safety logic block
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the association of an emergency stop device with a safety detector, maintaining the system's size and functionality while simplifying the addition of emergency stop functionality without requiring additional terminals or a safety logic block.
Implementation Method 1
The use of radiofrequency technology (RFID) allows the communication between the sensor and the transponder
Data Source
AI summary
A safety detector including a detection module configured for reading a control signal at the input, the detector including two supply terminals, a first control input and a first control output, a first safety output and a second safety output, and a first free terminal and a second free terminal, the detector including:a second control input connected to the first free terminal and a second control output connected to the second free terminal, anda test module configured for notably applying a first test sequence including a disabling of the first control output and a test of a start loop connected between the second control output and the first control input.