The economical and strategical advantages of migrating from discrete logic devices to complex programmablelogic devices (CPLD), are discussed. CPLDs offer a clear, cost effective alternative to 7400-based logic syste...
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The economical and strategical advantages of migrating from discrete logic devices to complex programmablelogic devices (CPLD), are discussed. CPLDs offer a clear, cost effective alternative to 7400-based logic systems. CPLDs pack more functionality into ever-shrinking die, offering compeling benefits of low cost on-the-spot reprogammability, short lead times, higher performance and unmatched flexibility. They provide a scalable technology that gives a superior solution for a wide range of high-volume applications.
Recently, the prevention and control of industrial pollution has attracted extensive attention. Many studies based on emission data have achieved great success, but there are relatively few studies on the emission dat...
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Recently, the prevention and control of industrial pollution has attracted extensive attention. Many studies based on emission data have achieved great success, but there are relatively few studies on the emission data acquisition. To this end, we propose a data acquisition and processing system (DAPS) for online monitoring of industrial pollutants. The system receives real-time emission data through the RS485, automatically generates periodic data, and saves it in the SQL Server database. Real-time Ethernet (RTE) is used to transmit control signals between the system and programmable logic controllers (PLCs). Emission data is transmitted to local industrial control systems and remote monitoring centers (RMCs) via a wireless network. We tested the acquisition function and communication function of the system through experiments and evaluated the overall performance of the system by observing the memory and CPU usage. The system is characterized by simple implementation and versatility and can be applied to continuous monitoring of various industrial pollutants.
This paper gives an approach to implementing an analytical thermal model with floating point operation into programmablelogic with limited bit width and step time. First, a third order thermal model for IGBT and diod...
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This paper gives an approach to implementing an analytical thermal model with floating point operation into programmablelogic with limited bit width and step time. First, a third order thermal model for IGBT and diode chips is converted to a fixed-point model. The model is then implemented into a PLD (programmablelogic Device). Cost effective VHDL (Very high-speed integrated circuit Hardware Description Language) design is taken into account and less than 5 % error between the theoretical model and the final implementation in an FPGA is shown. As a test case parameters of a module in practical application are used.
This paper describes the design of speed and current controllers of a multi-quadrant separately excited dc drive. Design and performance analysis of the drive is done through mathematical simulation. Genetic algorithm...
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This paper describes the design of speed and current controllers of a multi-quadrant separately excited dc drive. Design and performance analysis of the drive is done through mathematical simulation. Genetic algorithm (GA) is used to coordinate the parameters of PI speed and current controller. An integral performance criterion is used here.
In moving towards highly connected integrated systems, the Industrial Internet of Thing (IIoT) promises a wealth of benefits. Enhanced usage of existing data sources, and integration of additional generation points, p...
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ISBN:
(数字)9781839530890
In moving towards highly connected integrated systems, the Industrial Internet of Thing (IIoT) promises a wealth of benefits. Enhanced usage of existing data sources, and integration of additional generation points, provide system users with greater visibility of industrial processes. This visibility can be used to identify and address inefficiencies. Within the context of discrete manufacturing, examples include reduction of waste materials and energy consumption. However, while one becomes engrossed in the use of big-data analytics, cloud technologies, and seamless adoption through hardware gateways, decade old systems are dropped into a technological melting pot of modern IoT, with little consideration of additional cyber security risks. Numerous works have provided evidence to suggest industrial systems are highly vulnerable to cyber attacks, from both a device and communication protocol perspective, yet efforts to automatically identify vulnerabilities are limited. This presents a significant gap, with vulnerability exploitation harbouring potentially life-threatening impact. Here we address this gap through the development of PIVoT Scan, an industrially-aware vulnerability scanner, capable of assessing a diverse range of devices and communication protocols predominantly situated within the legacy layers of IIoT environments - "The forgotten I". Furthermore, we demonstrate PIVoT Scan's ability to outperform a leading vulnerability scanner, Nessus.
At the heart of any automated setup is a controller. However, the choice among a programmablelogic controller (PLC), process automation controller (PAC) and industrial PC (IPC) hinges on a series of decisions dictate...
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At the heart of any automated setup is a controller. However, the choice among a programmablelogic controller (PLC), process automation controller (PAC) and industrial PC (IPC) hinges on a series of decisions dictated by each individual application. The distinction between PLCs, PACs and industrial IPCs are often not clear-cut. A simple explanation of each follows: A PLC is considered the standard controller that is primarily designed for straightforward, robust control tasks.
This paper touches on the current frontiers reached in the automatic design of diagnostic systems. Based on an analysis of different classes of diagnostic systems (classified according to particular application domain...
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This paper touches on the current frontiers reached in the automatic design of diagnostic systems. Based on an analysis of different classes of diagnostic systems (classified according to particular application domains) the state-of the art is up-dated with new applications. New frontiers in the design of adaptive and autonomous diagnostic systems are theoretically opened.
The continued implementation of system architectures founded on industrial Ethernet is fast providing a universal distributed network solution. Nevertheless, the reality of today's industrial control landscape dem...
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The continued implementation of system architectures founded on industrial Ethernet is fast providing a universal distributed network solution. Nevertheless, the reality of today's industrial control landscape demands a breed of controllers that support multiple fieldbus protocols including Profibus, Modbus and DeviceNet. Towards the future, Ethernet-based control networks represent the next step in industrial communication either as the sole communication network, or integrated with other fieldbus networks. Communication networks based on Ethernet technology offer additional benefits in machine commissioning, process control and status feedback. Due to the ease of installation and availability of connection hardware, Ethernet-based communication networks represent a natural progression in industrial communications.
The input to the NP-hard Point Line Cover problem (PLC) consists of a set P of n points on the plane and a positive integer k, and the question is whether there exists a set of at most k lines which pass through all p...
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ISBN:
(纸本)9781611973389
The input to the NP-hard Point Line Cover problem (PLC) consists of a set P of n points on the plane and a positive integer k, and the question is whether there exists a set of at most k lines which pass through all points in P. By straightforward reduction rules one can efficiently reduce any input to one with at most k~2 points. We show that this easy reduction is already essentially tight under standard assumptions. More precisely, unless the polynomial hierarchy collapses to its third level, for any ε> 0, there is no polynomial-time algorithm that reduces every instance (P, k) of PLC to an equivalent instance with O(k~(2-ε)) points. This answers, in the negative, an open problem posed by Lokshtanov (PhD Thesis, 2009). Our proof uses the notion of a kernel from parameterized complexity, and the machinery for deriving lower bounds on the size of kernels developed by Dell and van Melkebeek (STOC 2010). It has two main ingredients: We first show, by reduction from Vertex Cover, that - unless the polynomial hierarchy collapses - PLC has no kernel of total size O(k~(2-ε)) bits. This does not directly imply the claimed lower bound on the number of points, since the best known polynomial-time encoding of a PLC instance with n points requires ω(n~2) bits. To get around this hurdle we build on work of Goodman, Pollack and Sturmfels (STOC 1989) and devise an oracle communication protocol of cost O(n log n) for PLC; its main building blocks are a bound of O(n~(O(n))) for the order types of n points that are not necessarily in general position and an explicit (albeit slow) algorithm that enumerates a superset of size n~(O(n)) of all possible order types of n points. This protocol, together with the lower bound on the total size (which also holds for such protocols), yields the stated lower bound on the number of points. While a number of essentially tight polynomial lower bounds on total sizes of kernels are known, our result is - to the best of our knowledge - the first to
Machine learning is playing an increasingly significant role in emerging mobile application domains such as AR/VR, ADAS, etc. Accordingly, hardware architects have designed customized hardware for machine learning alg...
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