The Experts below are selected from a list of 90 Experts worldwide ranked by ideXlab platform

Wolfgang Schröder-preikschat - One of the best experts on this subject based on the ideXlab platform.

  • EDMCC - A Distributed Implementation of Shared Virtual Memory with Strong and Weak Coherence
    Lecture Notes in Computer Science, 1
    Co-Authors: Wolfgang K Giloi, C Hastedt, Friedrich Schon, Wolfgang Schröder-preikschat
    Abstract:

    A virtual shared memory architecture (VSMA) is a distributed memory architecture that looks to the application software as if it were a shared memory system. The major problem with such a system is to maintain the coherence of the distributed data entities. Shared virtual memory means that the shared data entities are pages of local virtual memories with demand paging. Memory coherence may be strong or weak. Strong coherence is a scheme where all the shared data entities look from the outside as if they were stored in one coherent memory. This simplifies programming of a distributed memory system at the cost of a high message traffic in the system, needed to maintain the strong coherence. The efficiency of the system can be increased by adding a weak coherence scheme that allows for multiple writes by different threads of control into the same page. The price of the weak coherence scheme is the need for explicit program synchronizations, needed to reestablish at the end the strong coherence of the result. For the computer architect, the challenging question is how to implement a VSMA most efficiently and, specifically, by what architectural means to support the implementation. In the paper a new solution to this question is presented based upon an innovative distributed memory architecture in which Communication is conducted by a dedicated Communication Processor in each node rather than by the node CPU. This will make the exchange of short, fixed-size messages, e.g., invalidation notices, very efficient. Therefore, it becomes more appropriate to minimize the overall administrative overhead, even at the cost of more message traffic. On that rationale, a novel, capability-based mechanism for both strong and weak coherence of shared virtual memory is presented. The weak coherence scheme is built on top of the strong coherence, utilizing its mechanisms. The proposed implementation is totally distributed and based on a strict need to know philosophy. Consequently, the elaborate pointer lists and their handling at runtime typical for other solutions is not needed.

Ramazan Bayindir - One of the best experts on this subject based on the ideXlab platform.

  • design and implementation of an internet based effective controlling and monitoring system with wireless fieldbus Communications technologies for process automation an experimental study
    Isa Transactions, 2012
    Co-Authors: Yucel Cetinceviz, Ramazan Bayindir
    Abstract:

    Abstract The network requirements of control systems in industrial applications increase day by day. The Internet based control system and various fieldbus systems have been designed in order to meet these requirements. This paper describes an Internet based control system with wireless fieldbus Communication designed for distributed processes. The system was implemented as an experimental setup in a laboratory. In industrial facilities, the process control layer and the distance connection of the distributed control devices in the lowest levels of the industrial production environment are provided with fieldbus networks. In this paper, the Internet based control system that will be able to meet the system requirements with a new-generation Communication structure, which is called wired/wireless hybrid system, has been designed on field level and carried out to cover all sectors of distributed automation, from process control, to distributed input/output (I/O). The system has been accomplished by hardware structure with a programmable logic controller (PLC), a Communication Processor (CP) module, two industrial wireless modules and a distributed I/O module, Motor Protection Package (MPP) and software structure with WinCC flexible program used for the screen of Scada (Supervisory Control And Data Acquisition), SIMATIC MANAGER package program (“STEP7”) used for the hardware and network configuration and also for downloading control program to PLC.

  • a water pumping control system with a programmable logic controller plc and industrial wireless modules for industrial plants an experimental setup
    Isa Transactions, 2011
    Co-Authors: Ramazan Bayindir, Yucel Cetinceviz
    Abstract:

    This paper describes a water pumping control system that is designed for production plants and implemented in an experimental setup in a laboratory. These plants contain harsh environments in which chemicals, vibrations or moving parts exist that could potentially damage the cabling or wires that are part of the control system. Furthermore, the data has to be transferred over paths that are accessible to the public. The control systems that it uses are a programmable logic controller (PLC) and industrial wireless local area network (IWLAN) technologies. It is implemented by a PLC, an Communication Processor (CP), two IWLAN modules, and a distributed input/output (I/O) module, as well as the water pump and sensors. Our system Communication is based on an Industrial Ethernet and uses the standard Transport Control Protocol/Internet Protocol for parameterisation, configuration and diagnostics. The main function of the PLC is to send a digital signal to the water pump to turn it on or off, based on the tank level, using a pressure transmitter and inputs from limit switches that indicate the level of the water in the tank. This paper aims to provide a convenient solution in process plants where cabling is not possible. It also has lower installation and maintenance cost, provides reliable operation, and robust and flexible construction, suitable for industrial applications.

Yucel Cetinceviz - One of the best experts on this subject based on the ideXlab platform.

  • design and implementation of an internet based effective controlling and monitoring system with wireless fieldbus Communications technologies for process automation an experimental study
    Isa Transactions, 2012
    Co-Authors: Yucel Cetinceviz, Ramazan Bayindir
    Abstract:

    Abstract The network requirements of control systems in industrial applications increase day by day. The Internet based control system and various fieldbus systems have been designed in order to meet these requirements. This paper describes an Internet based control system with wireless fieldbus Communication designed for distributed processes. The system was implemented as an experimental setup in a laboratory. In industrial facilities, the process control layer and the distance connection of the distributed control devices in the lowest levels of the industrial production environment are provided with fieldbus networks. In this paper, the Internet based control system that will be able to meet the system requirements with a new-generation Communication structure, which is called wired/wireless hybrid system, has been designed on field level and carried out to cover all sectors of distributed automation, from process control, to distributed input/output (I/O). The system has been accomplished by hardware structure with a programmable logic controller (PLC), a Communication Processor (CP) module, two industrial wireless modules and a distributed I/O module, Motor Protection Package (MPP) and software structure with WinCC flexible program used for the screen of Scada (Supervisory Control And Data Acquisition), SIMATIC MANAGER package program (“STEP7”) used for the hardware and network configuration and also for downloading control program to PLC.

  • a water pumping control system with a programmable logic controller plc and industrial wireless modules for industrial plants an experimental setup
    Isa Transactions, 2011
    Co-Authors: Ramazan Bayindir, Yucel Cetinceviz
    Abstract:

    This paper describes a water pumping control system that is designed for production plants and implemented in an experimental setup in a laboratory. These plants contain harsh environments in which chemicals, vibrations or moving parts exist that could potentially damage the cabling or wires that are part of the control system. Furthermore, the data has to be transferred over paths that are accessible to the public. The control systems that it uses are a programmable logic controller (PLC) and industrial wireless local area network (IWLAN) technologies. It is implemented by a PLC, an Communication Processor (CP), two IWLAN modules, and a distributed input/output (I/O) module, as well as the water pump and sensors. Our system Communication is based on an Industrial Ethernet and uses the standard Transport Control Protocol/Internet Protocol for parameterisation, configuration and diagnostics. The main function of the PLC is to send a digital signal to the water pump to turn it on or off, based on the tank level, using a pressure transmitter and inputs from limit switches that indicate the level of the water in the tank. This paper aims to provide a convenient solution in process plants where cabling is not possible. It also has lower installation and maintenance cost, provides reliable operation, and robust and flexible construction, suitable for industrial applications.

Wolfgang K Giloi - One of the best experts on this subject based on the ideXlab platform.

  • a distributed implementation of shared virtual memory with strong and weak coherence
    EDMCC2 Proceedings of the 2nd Euronean Conference on Distributed Memory Computing, 1991
    Co-Authors: Wolfgang K Giloi, C Hastedt, Friedrich Schon, Wolfgang Schroderpreikschat
    Abstract:

    A virtual shared memory architecture (VSMA) is a distributed memory architecture that looks to the application software as if it were a shared memory system. The major problem with such a system is to maintain the coherence of the distributed data entities. Shared virtual memory means that the shared data entities are pages of local virtual memories with demand paging. Memory coherence may be strong or weak. Strong coherence is a scheme where all the shared data entities look from the outside as if they were stored in one coherent memory. This simplifies programming of a distributed memory system at the cost of a high message traffic in the system, needed to maintain the strong coherence. The efficiency of the system can be increased by adding a weak coherence scheme that allows for multiple writes by different threads of control into the same page. The price of the weak coherence scheme is the need for explicit program synchronizations, needed to reestablish at the end the strong coherence of the result. For the computer architect, the challenging question is how to implement a VSMA most efficiently and, specifically, by what architectural means to support the implementation. In the paper a new solution to this question is presented based upon an innovative distributed memory architecture in which Communication is conducted by a dedicated Communication Processor in each node rather than by the node CPU. This will make the exchange of short, fixed-size messages, e.g., invalidation notices, very efficient. Therefore, it becomes more appropriate to minimize the overall administrative overhead, even at the cost of more message traffic. On that rationale, a novel, capability-based mechanism for both strong and weak coherence of shared virtual memory is presented. The weak coherence scheme is built on top of the strong coherence, utilizing its mechanisms. The proposed implementation is totally distributed and based on a strict need to know philosophy. Consequently, the elaborate pointer lists and their handling at runtime typical for other solutions is not needed.

  • EDMCC - A Distributed Implementation of Shared Virtual Memory with Strong and Weak Coherence
    Lecture Notes in Computer Science, 1
    Co-Authors: Wolfgang K Giloi, C Hastedt, Friedrich Schon, Wolfgang Schröder-preikschat
    Abstract:

    A virtual shared memory architecture (VSMA) is a distributed memory architecture that looks to the application software as if it were a shared memory system. The major problem with such a system is to maintain the coherence of the distributed data entities. Shared virtual memory means that the shared data entities are pages of local virtual memories with demand paging. Memory coherence may be strong or weak. Strong coherence is a scheme where all the shared data entities look from the outside as if they were stored in one coherent memory. This simplifies programming of a distributed memory system at the cost of a high message traffic in the system, needed to maintain the strong coherence. The efficiency of the system can be increased by adding a weak coherence scheme that allows for multiple writes by different threads of control into the same page. The price of the weak coherence scheme is the need for explicit program synchronizations, needed to reestablish at the end the strong coherence of the result. For the computer architect, the challenging question is how to implement a VSMA most efficiently and, specifically, by what architectural means to support the implementation. In the paper a new solution to this question is presented based upon an innovative distributed memory architecture in which Communication is conducted by a dedicated Communication Processor in each node rather than by the node CPU. This will make the exchange of short, fixed-size messages, e.g., invalidation notices, very efficient. Therefore, it becomes more appropriate to minimize the overall administrative overhead, even at the cost of more message traffic. On that rationale, a novel, capability-based mechanism for both strong and weak coherence of shared virtual memory is presented. The weak coherence scheme is built on top of the strong coherence, utilizing its mechanisms. The proposed implementation is totally distributed and based on a strict need to know philosophy. Consequently, the elaborate pointer lists and their handling at runtime typical for other solutions is not needed.

Camilo Quintáns - One of the best experts on this subject based on the ideXlab platform.

  • A reconfigurable Communication Processor compatible with different industrial fieldbuses
    Lecture Notes in Computer Science, 2004
    Co-Authors: Ma Dolores Valdes, Miguel Angel Domínguez, José Moure, Camilo Quintáns
    Abstract:

    Fieldbuses constitute the lower level of Communication networks in a flexible manufacturing system. Nowadays there are a lot of proprietary protocols, thus the interconnection of equipment from different manufacturers has become very problematic. Changing equipment supposes the change of the fieldbus too with the consequent economic losses. This paper proposes the implementation of a Communication Processor based on a reconfigurable device that makes different fieldbuses compatible. In this way, using the appropriate level and impedance matching circuit, the same hardware can be connected to different fieldbuses. In order to verify this proposal a Communication Processor based on an FPGA supporting two very important fieldbus standards in the area of industrial control such as WorldFIP and Profibus, has been developed. Design constraints and performance of the implemented Processor are analyzed in this paper.

  • FPL - A Reconfigurable Communication Processor Compatible with Different Industrial Fieldbuses
    Field Programmable Logic and Application, 2004
    Co-Authors: Ma Dolores Valdes, Miguel Angel Domínguez, M.j. Moure, Camilo Quintáns
    Abstract:

    Fieldbuses constitute the lower level of Communication networks in a flexible manufacturing system. Nowadays there are a lot of proprietary protocols, thus the interconnection of equipment from different manufacturers has become very problematic. Changing equipment supposes the change of the fieldbus too with the consequent economic losses. This paper proposes the implementation of a Communication Processor based on a reconfigurable device that makes different fieldbuses compatible. In this way, using the appropriate level and impedance matching circuit, the same hardware can be connected to different fieldbuses. In order to verify this proposal a Communication Processor based on an FPGA supporting two very important fieldbus standards in the area of industrial control such as WorldFIP and Profibus, has been developed. Design constraints and performance of the implemented Processor are analyzed in this paper.