Field Apparatus Operating Log Ferroelectric Memory
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Solution Overview
Problem
The existing field apparatuses in plants and factories have a limited and ineffective alarm history function, making it difficult to accurately recognize and record errors due to restrictions in installation space and cost, particularly in embedded systems where only four previous alarms are saved, and increasing memory capacity is not feasible.
Innovation Solution
A field apparatus that generates an operating log with event type, time, and related information, stored in a log storage region of the ferroelectric memory, allowing for accurate recognition of previous events without significant scale or cost increases, by utilizing free space in the memory for log storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If memory capacity is increased to improve alarm history function, then event recognition accuracy is improved, but apparatus scale and cost increase
Solution Approach 1:
The alarm history function is segmented into two parts: a small on-device buffer for recent alarms and a remote server for comprehensive historical data. The field apparatus only needs to maintain a minimal buffer (4 alarms) while the server handles extensive storage, thus improving event recognition accuracy without increasing on-device memory capacity.
Solution Approach 2:
A remote server acts as an intermediary between the field apparatus and the user. The server receives alarm data from the field apparatus via communication means and provides comprehensive alarm history retrieval functions. This mediator enables enhanced event recognition capabilities while keeping the field apparatus compact and cost-effective.
2Adaptability or versatility
If alarm history buffer is expanded to save more alarms, then error analysis capability is improved, but installation space requirements increase
Solution Approach 1:
The error analysis functionality is segmented between the field apparatus (which maintains a compact buffer for recent alarms) and the remote server (which provides comprehensive historical data access). This segmentation enables robust error analysis capability while keeping the field apparatus installation space minimal.
Solution Approach 2:
The remote server provides universal alarm history storage and retrieval services that can support multiple field apparatuses. By centralizing the extensive storage function on the server, the system achieves versatile error analysis capability across the entire plant without requiring each field apparatus to have large local storage.
3Loss of information
If more alarm history is stored locally, then diagnostic information availability is improved, but device complexity increases
Solution Approach 1:
The complex alarm history management functionality is extracted from the field apparatus and relocated to the remote server. The field apparatus only maintains a simple buffer for recent alarms, while the server handles comprehensive storage, retrieval, and management. This extraction improves diagnostic information availability while keeping the field apparatus simple.
Solution Approach 2:
The remote server serves as an intermediary that handles all complex alarm history management operations. It receives alarm data from the field apparatus, maintains comprehensive historical records, and provides various retrieval and analysis functions. This mediator approach ensures complete diagnostic information availability while avoiding complexity in the field apparatus.
Data Source
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AI summary
This field apparatus is provided with: a first memory for storing a program defining operation of the field apparatus; a second memory which stores parameters used in the field apparatus; a log generation unit for generating an operating log associating first information indicating the type of an event which has occurred within the field apparatus, second information indicating the time at which the event occurred, and third information related to the event; and a control unit which includes the log generation unit and stores the operating log into a log storage area which has been reserved in a free space in either the first or second memory.