Plant Control Terminal Address Duplication Detection
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Solution Overview
Problem
In plant control systems, human errors during maintenance and address duplication lead to communication interference and malfunctions, as existing solutions do not adequately prevent the completion of opening procedures with incorrect address settings, potentially affecting healthy control devices.
Innovation Solution
A communication method where a higher-level device sequentially transmits call signals to communication terminal devices, and these devices compare their addresses to prevent duplicate address settings, locking communication if a duplication is detected, thereby preventing the completion of the opening procedure and avoiding communication interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an opening check procedure is performed to prevent address duplication, then reliability is improved, but the time required for communication startup increases
Solution Approach 1:
The patent applies preliminary action by having terminal devices perform self-diagnosis and address duplication detection before formal communication starts. The terminal devices check for address conflicts during the opening procedure itself, rather than requiring a separate extended check phase, thus preventing future communication errors while minimizing startup time delay.
Solution Approach 2:
The terminal devices autonomously perform address duplication detection and self-diagnosis without requiring continuous monitoring or intervention from the higher-level device. Each terminal device independently checks its own address against received communication frames, enabling the system to maintain reliability through decentralized self-verification while reducing overall system overhead.
2Productivity
If the opening procedure is simplified for immediate recovery, then productivity is improved, but the risk of human error causing malfunctions increases
Solution Approach 1:
The patent implements feedback mechanisms where terminal devices monitor incoming communication frames for address mismatches and detect duplications. When a terminal device receives a communication frame with an address that doesn't match its own or detects another device using the same address, it generates error signals and locks its communication function, providing immediate feedback that prevents malformed communication from affecting the system.
Solution Approach 2:
The terminal devices perform preliminary anti-action by proactively detecting address duplications and locking their communication functions before erroneous communication can propagate through the system. This preventive locking occurs as soon as a duplication is detected during the simplified opening procedure, counteracting potential errors before they can cause malfunctions in healthy control devices.
3Measurement precision
If address duplication detection is implemented at the terminal device level, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by implementing address duplication detection functionality within the existing terminal device communication processing unit. The same communication frame reception and processing circuitry that handles normal communication also performs address verification, eliminating the need for separate dedicated detection hardware and minimizing the increase in device complexity while achieving precise address verification.
Data Source
AI summary
A plant control system and communication method are capable of immediately dealing with wrong address settings created due to a human error during the execution of an opening procedure. In the plant control system, a higher-level device and a plurality of communication terminal devices are connected to each other through a communication path. Prior to the start of communication, a communication opening process of sequentially transmitting a call signal from the higher-level device to the terminal devices and acknowledging response signals therefrom is executed, which is followed by sequentially transmitting a call signal from the higher-level device to the terminal devices and receiving response signals from the terminal devices. The communication terminal devices compare addresses of the response signals returned from the other terminal devices to the higher-level device against an address set for local terminal devices. If a duplicate address exists, communication from the local terminal device is locked.