Valve Safety Module with Separated Safety and Operation Communication
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Solution Overview
Problem
Existing safety modules face interference between safety control and operation control communications due to their use of the same internal bus line, which can compromise the integrity of safety control operations.
Innovation Solution
A safety module with separate circuits for safety control and operation control communications, including a safety control processing circuit, operation control processing circuit, and a communication module that relays both types of communications, ensuring that operation control does not adversely affect safety control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same internal bus line is used for both safety control communication and operation control communication, then the device complexity is reduced, but the reliability of safety control communication deteriorates due to interference from operation control communication
Solution Approach 1:
The communication system is segmented into two independent parts: a safety control communication line dedicated solely to safety control signals, and an operation control communication line for operation control signals. This segmentation eliminates interference between the two communication types while maintaining manageable system complexity through clear functional separation.
Solution Approach 2:
A communication module acts as an intermediary device that relays both safety control communication and operation control communication between the control device and the safety module. This intermediary structure enables physical separation of communication pathways while maintaining coordinated control functionality.
2Reliability
If separate circuits are used for safety control communication and operation control communication, then the reliability of safety control is improved, but the device complexity increases
Solution Approach 1:
The communication module performs multiple functions: it relays safety control communication, relays operation control communication, and coordinates between the two communication types. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while maintaining separate communication pathways.
3Ease of operation
If operation control communication shares the same bus line as safety control communication, then the ease of operation is improved, but the safety control communication is restricted and its reliability deteriorates
Solution Approach 1:
The communication system is segmented into two independent parts: a safety control communication line dedicated solely to safety control signals, and an operation control communication line for operation control signals. This segmentation eliminates interference between the two communication types while maintaining manageable system complexity through clear functional separation.
Data Source
AI summary
A safety module which is able to communicate with a control device that performs a control on a valve module, is equipped with a safety control processing circuit that carries out a safety control communication with the control device, a connection terminal and a safety control wiring used in the safety control communication, an operation control processing circuit that performs an operation control communication with the control device, and outputs an operation control signal, an input terminal to which the operation control communication is input, an operation control wiring used in the operation control communication, and an output terminal which is able to output the operation control signal to the valve module.