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Data exchange is a critical issue within the engineering chain of production systems. Different engineering disciplines with different engineering tools have to be networked over the complete engineering chain. Thus, lossless and consistent engineering information exchange is a critical issue. AutomationML is one candidate for an exchange data format fulfilling several requirements of the data exchange...
Plug and produce (PnP) aims at reducing system engineering effort. Therefore several PnP aspects have to be solved. This paper gives an overview and classifies process types and PnP aspects. Furthermore it identifies coupled processes as the most challenging ones and provides a new engineering approach for such systems. A new two-step descriptive engineering approach is applied to automatically synthesise...
In this paper an ontology driven approach to the design of control systems, in particular, control applications of IEC 61499 standard is proposed. The source ontology is an ontological description of control object (plant) while the target ontology is an ontological description of a control system implemented using an appropriate programming language. For the ontologies transformation an extension...
The manual partitioning of virtual machines with real-time requirements onto a multi-core platform is expensive, does not guarantee to find an optimal solution, and does not scale with regard to the upcoming higher number of both virtual machines and processor cores. This work proposes an algorithmic solution. As a prerequisite, the partitioning problem is defined in a formal manner by the abstraction...
Quality control of prints is an important industrial application of machine vision. Commercial vision libraries provide different tools (e.g. barcode recognition, template matching) that facilitate the development of complete inspection systems. However, closed source software is usually not compatible with the modification of functions for optimization purposes, hampering the solution of specific...
The advent of many-core processors came with the increase in computational power needed for future applications. However new challenges arrived at the same time, especially for the real-time community. Each core on such a processor is a heat source and uneven usage can lead to hot spots on the processor, affecting its lifetime and reliability. For real-time systems, it is therefore of paramount importance...
Despite the efforts devoted to increase the dependability of highly-reliable distributed fieldbus systems by means of simplex stars and replicated stars/buses, literature lacks of appropriate analyses that quantify the system reliability these topologies yield. In previous work, we proposed models to adequately quantify the system reliability benefits of simplex buses and simplex/replicated stars...
The control technique based on infinite-gain resonators also called Adaptive Feedforward Cancellation (AFC) has been used for some years, mainly in continuous time. In this article, finite-gain resonators in discrete time are analyzed and the advantages for their use in practical applications are discussed, from the perspectives of dynamical behavior and computational implementation. The existing...
Optimizing the resource consumption by the products (machines) and making them environment friendly is the aim of almost all producers today. May it be due to cost of resources, their limited availability, their affect on the environment or consumer awareness. Ample research is being carried out at national and international level for resource optimization. Adding intelligence and learning capability...
This paper proposes a method for real time diagnosis against product quality drifts in an automated manufacturing system. We use Logical Diagnosis model to reduce the search space of suspected equipment in the production flow, which is then formulated as a Bayesian network to compute risk priority for each equipment, using joint and conditional probabilities. The objective is to quickly and accurately...
The existing worst-case response-time analysis for Controller Area Network (CAN) does not support mixed messages that are scheduled with offsets in the systems where the CAN controllers implement abortable transmit buffers. Mixed messages are partly periodic and partly sporadic. These messages are implemented by several higher-level protocols based on CAN that are used in the automotive industry....
Since the inception of the concept of Wireless Sensor Networks (WSNs), their applicability within the context of environmental monitoring systems (EMS) has constantly been explored. Egypt stands to gain much from WSN-based EMS systems if they are properly applied within its considerably large agricultural industry. A system is developed and tested using locally available hardware within the technical,...
This work presents an optimization method applied to robot coordination using temporal synchronization. The coordination process considers the possibility of using multi-robot systems in which each robot executes individually planned tasks in a shared environment. The coordination process generates a curve in a discretized coordination space that contains the sequence of coordinated configurations...
Reliability is a key requirement in many distributed real-time systems deployed in safety and mission critical applications, and temporal redundancy is a widely employed strategy towards guaranteeing it. The temporal redundancy approach is typically based on task re-executions in form of entire tasks, task alternates or, check-pointing blocks, and each of the re-execution strategies have different...
This paper presents the design and implementation of a System-on-Chip (SoC) based on a FPGA (Field-Programmable Gate Array) device to control and configure an ultrasonic beacon array for an extensive ultrasonic Local Positioning System (LPS). The SoC is based on a MicroBlaze microprocessor and some advanced peripherals. Among them, it is possible to remark a LPS controller, in charge of managing the...
Condition-based maintenance (CBM) has been implemented in industry to arrange the maintenance work as efficiently as possible. Case-based reasoning (CBR) can be used to automate part of the CBM decision process. However, in complex situations the final decisions have to be made by domain maintenance experts based on information gathered from several sources. This paper presents an approach for utilizing...
Being distributed in nature, IEC 61499 industrial control applications are subject to partial failures. Building applications that are tolerant of these failures (i.e. a fault-tolerant application) may be achieved through the use of replication. In this paper we present a framework to support replicated IEC 61499 applications, and study how replica determinism may be achieved in this framework.
Fast evolving requirements for the manufacturing sectors, which must now take much more into account problems such as product customization, markets volatility and shortening life cycles, imposes to focus the attention of innovation towards a new generation of automation systems based on the CPS paradigm. The work here presented therefore suggest a new extension of the Cyber-Physical Systems functionalities...
The software architecture AUTOSAR has become a standard in the automotive domain in recent years. It supports the development of reusable standardized software components that can be easily assigned to electronic control units (ECUs) at design time. At the end of the development process the AUTOSAR middleware is configured and compiled into a static configuration. However, future automotive systems...
Consolidation and isolation are key technologies that promoted the undisputed popularity of virtualization in most of the computer industry. This popularity has recently led to a growing interest in real-time virtualization, making this technology enter the real-time system market. However, it has several issues due to the strict timing guarantees contracted. Moreover supporting legacy software stacks...
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