| Paper | Title | Page |
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| S08NC01 | ARCNET as a Field Bus in the Fermilab Linac Control System | 291 |
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Funding: Work supported by the U.S. Department of Energy under contract No. DE-AC02-76CHO3000 Data acquisition hardware in accelerator control systems is connected by a field bus to networked computers that supply data to consoles. Industry attempts to standardize on a low level field bus have not succeeded in providing a single well supported bus. This paper describes a data acquisition chassis that connects to VMEbus computers using ARCNET, a full featured token-passing local area network, as the field bus. The performance of this technique as implemented in the control system for the Fermilab Linac is given. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC01 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC02 | Multi-Processor Network Implementations in Multibus II and VME | 295 |
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ACNET (Fermilab Accelerator Controls Network), a proprietary network protocol, is implemented in a multi-processor configuration for both Multibus II and VME. The implementations are contrasted by the bus protocol and software design goals. The Multibus II implementation provides for multiple processors running a duplicate set of tasks on each processor. For a network connected task, messages are distributed by a network round-routed for each task by user-callable commands. The VME implementation provides for multiple processors running one task across all processors. The process can either be fixed to a particular processor or dynamically allocated to an available processor depending on the scheduling algorithm of the multi-processing operating system.
Operated by Universities Research Association for the Department of Energy. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC02 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC03 | A Distributed Design for Monitoring Logging and Replaying Device Readings at LAMPF | 299 |
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Funding: Work supported by the U.S. Department of Energy As control of the Los Alamos Meson Physics linear accelerator and Proton Storage Ring moves to a more distributed system, it has been necessary to redesign the software which monitors, logs, and replays device readings throughout the facility. The new design allows devices to be monitored and their readings logged locally on a network of computers. Control of the monitoring and logging process is available throughout the network from user interfaces which communicate via remote procedure calls with server processes running on each node which monitors and records device readings. Similarly, the logged data can be replayed from anywhere on the network. Two major requirements influencing the final design were the need to reduce the load on the CPU of the control machines, and the need for much faster replay of the logged device readings. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC03 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC04 | Synchronous Message-Based Communication for Distributed Heterogeneous Systems | 302 |
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| The use of a synchronous, message-based real-time operating system (Unison) as the basis of transparent interprocess and inter-processor communication over VMEbus is described. The implementation of a synchronous, message-based protocol for network communication between heterogeneous systems is discussed. In particular, the design and implementation of a message-based session layer over a virtual circuit transport layer protocol using UDP /IP is described. Inter-process communication is achieved via a message-based semantic which is portable by virtue of its ease of implementation in other operating system environments. Protocol performance for network communication among heterogeneous architectures is presented, including VMS, Unix, Mach and Unison. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC04 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC05 | The Transmission of Accelerator Timing Information around CERN | 306 |
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| Prior to the construction of the Large Electron Positron (LEP) collider, machine timing information was transmitted around CERN’s accelerators using a labyrinth of dedicated copper wires. However, at an early stage in the design of the LEP control system, it was decided to use an integrated communication system based on Time Division Multiplex (TDM) techniques. Therefore it was considered appropriate to use this facility to transmit timing information over long distances. This note describes the overall system, with emphasis placed on the connectivity requirements for the CCITTG.703 series of recommendations. In addition the methods used for error detection and correction, and also for redundancy, are described. The cost implications of using such a TDM based system are also analyzed. Finally the performance and reliability obtained by using this approach are discussed. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC05 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC06 | Time and Load Measuring in the SPS/LEP Control System | 310 |
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| This paper describes the experiences with the SPS/LEP Control System during its first operational days from the communication point of view. The results show difference between hardware possibility of the local communication based on the modem technology and the possibility to use it by PC machines. There is also several figures describing the activity on the communication lines. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC06 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC07 | The ELETTRA Field Highway System | 313 |
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| ELETTRA is a third generation Synchrotron Light Source under construction in Trieste (Italy); it consists of a full energy linac injector and a storage ring with beam energies between 1.5 and 2 GeV. The ELETTRA control system has a distributed architecture, hierarchically divided into three layers of computers; two network levels provide communication between the adjacent computer layers. The field highway adopted for the connection of the middle-layer local process computers with the bottom-layer equipment interface units is the MIL-1553B multidrop highway. This paper describes the hardware configuration and the main communication services developed on the MIL-15538 field highway for accelerator control. As an additional feature, typical LAN utilities have been added on top of the basic MIL-15538 communication software allowing remote login and file transfer; these tools are currently used for software development in our laboratory. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC07 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC08 | Network Communication Libraries for the Next Control System of the KEK e⁻/e⁺ Linac | 318 |
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| The network communication libraries for the next control system of the KEK Linac have been developed. They are based on TCP/IP sockets, and show high availability among the different operating systems: UNIX, VAX/VMS, and MS-DOS. They also show high source portability of application programs among the different computer systems provided by various vendors. The performance and problems are presented in detail. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC08 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC09 | A Program Development Tool for KEK VME-MAP Control System | 322 |
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| The control system for KEK 12 GeV Proton Synchrotron has been replaced with a distributed VME-bus based microcomputer system and a MAP local area network. In order to simplify programming for network application tasks, a set of a preprocessor for a PASCAL compiler and a network communication server has been developed. Application programs for accelerator control system have blocks with similar codes; sending, waiting for, receiving, analyzing messages, etc. The preprocessor called "OBJP" incorporates such common codes into the source code written by an application programmer. In case of a simple program, the size of the source code is reduced by one tenth of a full coding. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC09 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC10 | Network Performance for Graphical Control Systems | 326 |
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| Vsystem is a toolbox for building graphically-based control systems. The real-time database component, Vaccess, includes all the networking support necessary to build multi-computer control systems. Vaccess has two modes of database access, synchronous and asynchronous. Vdraw is another component of Vsystem that allows developers and users to develop control screens and windows by drawing rather than programming. Based on Xwindows, Vsystem provides the possibility of running Vdraw either on the workstation with the graphics or on the computer with the database. We have made some measurements on the cpu loading, elapsed time and the network loading to give some guidance in system configuration performance. It will be seen that asynchronous network access gives large performance increases and that the network database change notification protocol can be either more or less efficient than the X-window network protocol, depending on the graphical representation of the data. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC10 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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| S08NC11 | A New Approach in Development of Data Flow Control and Investigation System for Computer Networks | 329 |
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| Seven years ago we started the development of a new control system for an experimental electron accelerator in our institute. This paper describes a new approach in development of data flow control and investigation system for computer networks. This approach was developed and applied in the Moscow Radiotechnical Institute for control and investigations of Institute computer network. It allowed us to solve our network current problems successfully. Description of our approach is represented below along with the most interesting results of our work. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-ICALEPCS1991-S08NC11 | |
| About • | Received ※ 11 November 1991 — Accepted ※ 20 November 1991 — Issued ※ 04 December 1992 | |
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