The Simplex Architecture for Safe On-Line Control System Upgrades
نویسنده
چکیده
In this paper, we describe the Simplex architecture, a real-time software technology which supports the safe, reliable introduction of control system upgrades while the system is running. We present the Simplex architecture from a control application point of view. In particular, we discuss the fault-tolerance feature of the technology, introduce its basic structure in control systems, and investigate the control issues when the technology is employed. Application of the the Simplex architecture is demonstrated for a plasma-enhanced chemical vapor deposition (PECVD) system, a standard process in semiconductor manufacturing. We conclude the paper with a discussion of the potential impact that the Simplex architecture can make on future control applications.
منابع مشابه
Switching Controllers Based on Neural Network: Estimates of Stability Regions and Controller Performance
This paper presents new results on switching control using neural networks. Given a set of candidate controllers, a pair of neural networks is trained to identify the stability region and estimate the closed-loop performance for each controller. The neural network outputs are used in the on-line switching rule to select the controller output to be applied to the system during each control perio...
متن کاملA Distributed Safety-Critical System for Real-Time Train Control
An architecture and methodology for executing a train control application in an ultra-safe manner is presented in this paper. Prior work in advanced train control systems are summarized along with their assumptions and drawbacks. A flexible architecture that allows fault-tolerant and fail-safe operation is presented for a distributed control system. A safety assurance technique which detects er...
متن کاملA Controller Design with ANFIS Architecture Attendant Learning Ability for SSSC-Based Damping Controller Applied in Single Machine Infinite Bus System
Static Synchronous Series Compensator (SSSC) is a series compensating Flexible AC Transmission System (FACTS) controller for maintaining to the power flow control on a transmission line by injecting a voltage in quadrature with the line current and in series mode with the line. In this work, an Adaptive Network-based Fuzzy Inference System controller (ANFISC) has been proposed for controlling o...
متن کاملA Software Architecture for Dependable and Evolvable Industrial Computing Systems
The downtime of a large industrial operation is often prohibitively expensive and a failure of a mission critical system could have disastrous consequences. Lacking an effective approach to mitigate the risks in system upgrades or to introduce third party supplied open system components, many industrial systems and defense systems are forced to keep outdated computing hardware and software. A p...
متن کاملTechnical Report CMU/SEI-95-TR-005 ESC-TR-95-005 A Software Architecture for Dependable and Evolvable Industrial Computing Systems
The downtime of a large industrial operation is often prohibitively expensive and a failure of a mission critical system could have disastrous consequences. Lacking an effective approach to mitigate the risks in system upgrades or to introduce third party supplied open system components, many industrial systems and defense systems are forced to keep outdated computing hardware and software. A p...
متن کامل