Design of CAN board circuits based on SJA1000 for vehicle motor drives systems

Author name used in this publication: K. W. E. ChengAuthor name used in this publication: K. DingVersion of RecordPublishe

SPS and LEP controls, status and evolution towards the LHC era

LEP was the first CERN accelerator to be built with a Control System based largely on off-the-shelf technology. Operational experience has confirmed the strategies of the original design. However, to maintain this system, components have to be renewed and in order to meet the increasing user demands the system requires continuous investment. These factors have ensured that the Control System is still based on a modern computer infrastructure and the recent extension to the SPS machine and its Experimental Areas has been achieved without any specific developments of the basic infrastructure. Increasingly, complete industrial systems are replacing old and obsolete equipment of the accelerators and technical services. Strategies are evolving to interface and progressively integrate Industrial Control Systems into the existing infrastructure. We present a status report of the Control System today and describe the current work to upgrade and prepare it for future applications in the LHC era

Power line communication systems for industrial control applications

For almost as long as the electricity distribution industry itself has existed, so also has the idea of utilising the transmission grid, be it over a wide area or on a local basis, for the transmission of 'intelligence'. This might be in the form of voice transmissions, or for the purposes of monitoring or controlling electrical devices attached to the network. This thesis specifically concerns itself with the potential applications of power-line-carrier (PLC) communications technology within the field of industrial plant/equipment control, as it is within this field that the author works. We look at the entire subject area of industrial control, starting from a historical viewpoint, and consider the special needs and requirements that a proposed PLC solution must offer for this application, especially based on the noise conditions likely to be experienced on a `real' power line. A proposal is made for a `Power Bus', intended for use within certain areas of industrial control, and decisions are made based on the projected link response times for such applications. The experimental phase of the research is practical in nature and consists of a raft of tests and evaluations of the performance of power line modem technologies, under controlled and repeatable noise conditions. To complement these results, further tests are carried out under `real world' conditions, within an actual factory environment. Based on the results of all of these tests, the suitability of a PLC solution for this type of industrial control application is considered. The Thesis concludes with a look at recent developments in, as well as the future of, Power Line Communication techniques

Technical Management for Buildings

This paper is a presentation of an 'instrument' for the optimization of the functionality and conservation of tertiary buildings. This technique has several different names: Building Automation Systems (BAS), Central Control and Monitoring System (CCMS) in English, and Gestion Technique du Bâtiment' (GTB) or Gestion Technique Centralisée (GTC) in French. With this technique it is possible to manage all the functions of a building, it is a modern instrument that introduces the concept of 'automation' in the operation of buildings using computerized procedures, earlier reserved for industrial processes. The system is structured with different automation levels with a distributed intelligence, each level characterized by a communication system (Fieldbus for the lowest and Ethernet for the highest level). In order to apply the BAS to CERN buildings it is necessary to evaluate the advantages, the CERN requirements and the integration with the several existing control and automation systems

A Dual-Rate Model Predictive Controller for Fieldbus Based Distributed Control Systems

In modern Distributed Control Systems (DCS), an industrial computer network protocol known as fieldbus is used in chemical, petro-chemical and other process industries for real-time communication between digital controllers, sensors, actuators and other smart devices. In a closed-loop digital control system, data is transferred from sensor to controller and controller to actuator cyclically in a timely but discontinuous fashion at a specific rate known as sampling-rate or macrocycle through fieldbus. According to the current trend of fieldbus technology, in most industrial control systems, the sampling-rate or macrocycle is fixed at the time of system configuration. This fixed sampling-rate makes it impossible to use a multi-rate controller that can automatically switch between multiple sampling-rates at run time to gain some advantages, such as network bandwidth conservation, energy conservation and reduction of mechanical wear in actuators. This thesis is concerned about design and implementation of a dual-rate controller which automatically switches between the two sampling-rates depending on system’s dynamic state. To be more precise, the controller uses faster sampling-rate when the process goes through transient states and slower sampling-rate when the process is at steady-state operation. The controller is based on a Model Predictive Control (MPC) algorithm and a Kalman filter based observer. This thesis starts with theoretical development of the dual-rate controller design. Subsequently, the developed controller is implemented on a Siemens PCS 7 system for controlling a physical process. The investigation has concluded that this control strategy can indeed lead to conservation of network bandwidth, energy savings in field devices and reduction of wear in mechanical actuators in fieldbus based distributed control systems

A conformance test framework for the DeviceNet fieldbus

The DeviceNet fieldbus technology is introduced and discussed. DeviceNet is an open standard fieldbus which uses the proven Controller Area Network technology. As an open standard fieldbus, the device conformance is extremely important to ensure smooth operation. The error management in DeviceNet protocol is highlighted and an error injection technique is devised to test the implementation under test for the correct error-recovery conformance. The designed Error Frame Generator prototype allows the error management and recovery of DeviceNet implementations to be conformance tested. The Error Frame Generator can also be used in other Controller Area Network based protocols. In addition, an automated Conformance Test Engine framework has been defined for realising the conformance testing of DeviceNet implementations. Automated conformance test is used to achieve consistent and reliable test results, apart from the benefits in time and personnel savings. This involves the investigations and feasibility studies in adapting the ISO 9646 conformance test standards for use in DeviceNet fieldbus. The Unique Input/Output sequences method is used for the generation of DeviceNet conformance tests. The Unique Input/Output method does not require a fully specified protocol specification and gives shorter test sequences, since only specific state information is needed. As conformance testing addresses only the protocol verification, it is foreseen that formal method validation of the DeviceNet protocol must be performed at some stage to validate the DeviceNet specification

Automating Home Appliances For Elderly and Impaired People: The B-Live Approach

DETIThis paper describes the B-Live approach for automating home appliances for elderly and impaired people. This system has been developed at Micro I/O for enhancing the quality of life and the independence of its potential users. The target application is the retrofitting of common dwellings. The paper introduces the motivation for the B-Live system and presents a survey on current Smart Home projects and endeavours. The B-Live system is described and details on its software, hardware and communications architecture are provided. A survey of the supported appliances and interfaces is presented as well as a description of the B-live configuration and operation procedures. The suitableness of the B-Live system to improve the autonomy of the envisaged users was informally evaluated by C4, C5 and C6 patients at the CMRRC Rovisco Pais demonstrator. The conclusion is that the system has a short learning curve and can cope with the requirements of its potential users

Remote monitoring of industrial frequency converters

Frequency converters are sometimes mounted at places, in which they have the most processing power of the surrounding devices. Often the remote monitoring of frequency converters has been implemented in an external programmable logic controller PC which is connected to the Internet. Sometimes it is not reasonable to use an extra computer at the location, which means the remote connection should be directly connectible to the frequency converter. This master’s thesis studies the possibility to use SOAP for a remote connection, established from the frequency converter to an external database server. The objective is to create a remote monitoring connection which is easily deployable for the end user. The implementation considers compatibility issues with firewalls, proxy servers and NAT routers.fi=Opinnäytetyö kokotekstinä PDF-muodossa.|en=Thesis fulltext in PDF format.|sv=Lärdomsprov tillgängligt som fulltext i PDF-format