On-chip clock networks are remarkable in their impact on the performance and power of synchronous circuits, in their susceptibility to adverse effects of semiconductor technology scaling, as well as in their strong po...
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ISBN:
(纸本)9783981080162
On-chip clock networks are remarkable in their impact on the performance and power of synchronous circuits, in their susceptibility to adverse effects of semiconductor technology scaling, as well as in their strong potential for improvement through better CAD algorithms and tools. Our work offers new algorithms and a methodology for SPICE-accurate optimization of clock networks, coordinated to satisfy slew constraints and achieve best trade-offs between skew, insertion delay, power, as well as tolerance to variations. Our implementation, called Contango, is evaluated on 45nm benchmarks from IBM Research and Texas Instruments with up to 50K sinks.
This paper deals with the evaluation of Discrete Control Systems whose implementation is distributed among programmable logic controllers (PLC) and remote Input/Output devices communicating through a Wireless Network....
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ISBN:
(纸本)9781424481545
This paper deals with the evaluation of Discrete Control Systems whose implementation is distributed among programmable logic controllers (PLC) and remote Input/Output devices communicating through a Wireless Network. Using wireless communication in these applications, called Wireless Networked Discrete Control System (WNDCS), offers many advantages such as a greater mobility and reduced wiring costs, but also several disadvantages such as transmission delay, jitter phenomena or loss of messages due to nondeterministic features of wireless communication. These features may have a negative impact on the behaviour of the control applications, and especially on the temporal performance and dependability requirements that a control system usually has to face. This paper proposes an algorithm for the management of the IEEE 802.11e priorities with regards to control needs in order to increase the performance of the WNDCS. Efficiency of the proposed algorithm is shown using OPNET simulations of a case study.
This paper describes the problems generally faced with PLC based control systems and a general procedure to solve them. Flowcharts for troubleshooting of power supply faults, internal and external problems of PLC has ...
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ISBN:
(纸本)9781424478132
This paper describes the problems generally faced with PLC based control systems and a general procedure to solve them. Flowcharts for troubleshooting of power supply faults, internal and external problems of PLC has been included in the paper. The approach mentioned for troubleshooting is general and can be applied on any type of PLC based control system. A case study is included to validate the developed general procedure for the trouble shooting of PLC based controlled system.
programmable logic controllers (PLCs) represent a typical class of embedded software systems. They are widely used in safety-critical industrial applications, such as railways, automotive applications, etc. The paper ...
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There has been significant development in wireless technology which has enabled us to connect devices with conveniences. This paper makes an effort to utilize one of the wireless technologies ZigBee to programmable lo...
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This paper reports a modeling methodology for generating the programmablelogic Controller (PLC) code and the Plant model. Since the control part is not deeply considered in the early design phase of manufacturing sys...
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ISBN:
(纸本)9781617387029
This paper reports a modeling methodology for generating the programmablelogic Controller (PLC) code and the Plant model. Since the control part is not deeply considered in the early design phase of manufacturing system, it often takes much time to create or to modify when the method of process is changed. The test run to verify the control logic is fulfilled in the constructed line, and it sometimes takes severe damages on facilities or human resources. Therefore the PLC simulation is getting more important recently. For the PLC Simulation, the counterpart model (Plant Model) to the PLC is necessary to model the virtual devices. Regarding the forward engineering principle, this paper proposes modeling approach which enables to create PLC code and Plant model for PLC simulation. With the careful investigation about the PLC code and the Plant model, the paper shows three important factors for manufacturing system design, such as hierarchical device structure, possible states for each device, and the process sequence in each station unit.
This paper presents a novel implementation of a constrained predictive control (MPC) algorithm. The MPC algorithm is based on Laguerre predictions and multi-parametric solutions guaranteeing larger feasibility sets, l...
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ISBN:
(纸本)9781846000386
This paper presents a novel implementation of a constrained predictive control (MPC) algorithm. The MPC algorithm is based on Laguerre predictions and multi-parametric solutions guaranteeing larger feasibility sets, low computational burden and memory storage. Specifically the paper discusses programming of MPC in an industrial Programable logic Controller (PLC) software. A laboratory experiment test was carried out to demonstrate the code on real hardware. The result of this work serve as an encouragement to further investigate the potential for developing efficient algorithms within off the shelf industrial standard hardware.
The motion control and the programmablelogic controller (PLC) are essential sub-modules in the industry automation systems. The integration of motion control teaching components into a course has been successful for ...
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Data transfer rate is the amount of data that can be transferred at a time. Network Control System (NCS) based communication system Industrial Ethernet (IE) is becoming very popular for automation system. The Fast Eth...
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This paper proposes a system for the monitoring and data acquisition of information that are associated with the energy consumed by an equipment or facility. The acquired data are stored in a relational database and c...
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