A report on automation and development of programmable logic controllers (PLC) soft solutions were presented. It was shown that soft PLC solution is part of an environment that is stable enough to control most process...
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A report on automation and development of programmable logic controllers (PLC) soft solutions were presented. It was shown that soft PLC solution is part of an environment that is stable enough to control most processes in any industry. It was observed that there were no boundaries of communication to ERP or MIS systems.
Networking technologies for industrial applications have grown in capabilities and number. Fieldbuses were introduced in the late 1980s as digital replacements for analog 4-20 mA relay systems for programmablelogic c...
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Networking technologies for industrial applications have grown in capabilities and number. Fieldbuses were introduced in the late 1980s as digital replacements for analog 4-20 mA relay systems for programmable logic controllers (PLCs), but few could keep up with the faster cycle times of emerging PC-based machine control.
programmablelogic controller (PLC) is a solid-state programmable electrical/electronic interface that can manipulate, execute, and/or monitor, at a very fast rate, the state of a process or communication systems. It ...
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programmablelogic controller (PLC) is a solid-state programmable electrical/electronic interface that can manipulate, execute, and/or monitor, at a very fast rate, the state of a process or communication systems. It operates on the basis of programmable data contained in an integral microprocessor-based system. PLC provides dependable, high-speed control and monitoring demanded by a wide variety of automated applications. It is usually programmed in relay ladder logic and is designed to operate in an industrial environment.
Most leading PLC suppliers now support an IEC standard defining a suite of universal programming languages. Compliance with the IEC 1131-1 is seen to offer potential benefits to both PLC users and suppliers. For users...
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Most leading PLC suppliers now support an IEC standard defining a suite of universal programming languages. Compliance with the IEC 1131-1 is seen to offer potential benefits to both PLC users and suppliers. For users, PLC training becomes much simpler and cheaper. For vendors, the standard will ease up usual problem in constructing programs and, consequently, improves the quality of programming.
NPC Service Inc. (NPC) is an environmental recovery company created to perform the labor-intensive task of site clean-up. The primary remediation technique used by NPC is to hydraulically contain, remove, and destroy ...
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NPC Service Inc. (NPC) is an environmental recovery company created to perform the labor-intensive task of site clean-up. The primary remediation technique used by NPC is to hydraulically contain, remove, and destroy the liquid chemical waste. NPC selected programmable logic controllers (PLCs) to meet the challenge. By using PLCs, NPC successfully removed and destroyed contaminated liquids.
This paper presents a hybrid fuzzy logic controller for speed control of switched reluctance motor (SRM). Classical PID controllers fail to perform satisfactorily under non-linearity, load disturbances, and parameter ...
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This paper presents a hybrid fuzzy logic controller for speed control of switched reluctance motor (SRM). Classical PID controllers fail to perform satisfactorily under non-linearity, load disturbances, and parameter variations. In this paper, the performance of SRM is examined with a hybrid fuzzy controller. Here, the proportional (P) term of the classical PID controller is replaced with an incremental fuzzy logic controller. The paper describes the modelling and simulation of hybrid fuzzy logic controlled SRM drive system. The simulated results of the proposed controller show improved performance of SRM as compared to classical PID control action.
The application of programmable logic controllers (PLCs) in the control of scenery changes in the theater and opera house stages of the Stadttheater Mannheim theater in Mannheim, Germany, is discussed. The theater emp...
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The application of programmable logic controllers (PLCs) in the control of scenery changes in the theater and opera house stages of the Stadttheater Mannheim theater in Mannheim, Germany, is discussed. The theater employs Control Techniques AC and DC drives to control the different hoists and stage equipment. Overall control in the opera house is carried out by a host computer. In the theater, the communications protocol Interbus-S is used for high-speed information between drives.
The invention of integrated circuit TTL displaced the transistor in embedded-system designs. Sometime in 1980s, microprocessors began displacing TTL. However, in the coming years, it is assumed that microprocessors wi...
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The invention of integrated circuit TTL displaced the transistor in embedded-system designs. Sometime in 1980s, microprocessors began displacing TTL. However, in the coming years, it is assumed that microprocessors will be displaced by programmable-logic devices (PLDs) in most embedded-system designs. This transition will most likely have a significant impact on the design and implementation of embedded systems, and designers need to prepare for this change. In order to determine when this transition will occur, the development of the microprocessor is evaluated.
This paper describes an electro-hydraulic servo-actuator using dual-mode controllers in the control loop. The aim is a null stationary error and the shortest possible time response. The mathematical model of the servo...
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This paper describes an electro-hydraulic servo-actuator using dual-mode controllers in the control loop. The aim is a null stationary error and the shortest possible time response. The mathematical model of the servo-actuator is constructed taking into account the functional model of the open-centre servo-valve. This model is used for the numerical simulation of the system functioning. The model uses mass flow ratios in order to obtain a more stable and realistic numerical simulation. The dynamic simulation studies the behavior of the servo-actuator with different controllers in the control loop. The model tests the proportional controller and types of programmable logic controllers. The controllers are implemented in MATLAB/SIMULINK. The controllers are tested by numerical simulation. One may assume the technical superiority of programmable logic controllers.
The article discusses the use of programmablelogic to build custom microcontrollers. The importance of using programmablelogic for microcontrollers is that experimenting with new designs can be done in a matter of m...
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The article discusses the use of programmablelogic to build custom microcontrollers. The importance of using programmablelogic for microcontrollers is that experimenting with new designs can be done in a matter of minutes. The elements required to create viable custom microcontrollers include full featured 32bit risc microprocessors and readily available peripherals as well as options for building custom peripherals, intellectual property and development tools.
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