Distributed Field Device Data Backup Using XOR Check Bits
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Solution Overview
Problem
Current methods for backing up parameter values of field devices in process automation plants are inefficient and prone to data loss, especially in the event of device failure or destruction, as they rely on manual files, removable memory modules, or paper documentation.
Innovation Solution
A method and system that utilize an XOR function to combine data bit sequences from multiple field devices, storing check bit sequences in additional field devices, reducing memory requirements and enabling secure, distributed data storage across multiple devices, allowing for efficient retrieval of data in case of device failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parameter values are stored in backup files on servicing devices or removable memory modules, then data can be backed up, but the data is prone to loss in case of device failure or destruction
Solution Approach 1:
The patent divides the backup storage function across multiple field devices instead of relying on a single central backup location. Each field device stores parameter values locally in its own memory, segmenting the backup function to eliminate single points of failure and ensure data survives device destruction
Solution Approach 2:
The patent creates copies of parameter values by having each field device store not only its own parameters but also parameter values from other field devices. This copying mechanism ensures that if one device fails, its parameters can be recovered from another device that holds a copy
2Ease of operation
If all field devices store complete parameter values of all other field devices, then data retrieval is simplified, but memory requirements increase significantly
Solution Approach 1:
The patent applies local quality by having each field device store parameter values selectively based on its role and relationships with neighboring devices. Instead of uniform storage across all devices, each device stores parameters locally relevant to it, reducing overall memory requirements while maintaining retrieval capability
Solution Approach 2:
The patent introduces a hierarchical dimension to parameter storage, where parameter values are organized by device groups or zones. Field devices store parameters of devices within their local group, creating a multi-level storage structure that reduces individual device memory burden while enabling efficient local retrieval
3Device complexity
If parameter values are stored centrally in one location, then storage management is simplified, but the system is vulnerable to single point of failure
Solution Approach 1:
The patent segments the centralized storage function into distributed storage across multiple field devices. Each device maintains its own parameter storage independently, eliminating the single point of failure inherent in centralized storage while the overall system maintains coordinated management through the control unit
4Ease of manufacture
If manual backup methods using files or paper documentation are used, then implementation is simple, but time and costs are increased during device replacement
Solution Approach 1:
The patent enables field devices to automatically exchange and store parameter values with each other without requiring manual intervention. When a device is replaced, the control unit automatically retrieves parameters from the new device or transfers them from existing devices, eliminating manual backup and reconfiguration time
Solution Approach 2:
The patent performs parameter storage and exchange operations in advance, so that when device replacement is needed, parameters are already available in the system. Field devices continuously maintain updated parameter values in their memory, so no time is lost during replacement as parameters are immediately accessible
Data Source
AI summary
The disclosure includes a method and a system for the distributed storing of information in a plant of process automation having a plurality of field devices, the method including: reading data in the form of data bit sequences, both from a first field device as well as also from at least a second field device, by a logic unit; combining at least a first data bit sequence read from the first field device with at least a second data bit sequence read from the second field device by means of an XOR function executed by the logic unit for forming a first check bit sequence, wherein in the check bit sequence each position corresponds to an XOR operation of the corresponding locations of the first and second data bit sequences; and storing the check bit sequence in a third field device.