Momal, F From a UNIX to a PC Based SCADA System In order to facilitate the development of supervisory applications involved in slow process control (such as cryogenic control), the LHC/IAS Group (Equipment Controls Group) opted, a few years ago, for an industrial SCADA package which runs on UNIXÒ platforms. However, to reduce costs and following market trends, it has been decided to move over to a PC-based package. Several processes relating to the testing of the prototypes of the LHC magnets are already controlled in this way. However, it was still necessary to provide all the services previously available to the users, for example, data archiving in central databases, real-time access through the Web, automatic GSM calls, etc. This paper presents the advantages and drawbacks of a PC-based package versus a Unix-based system. It also lists the criteria used in the market survey to arrive at the final selection, as well as, the overall architecture, highlighting the developments needed to integrate the package into the global computing environment. eng 1999

http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=CERN-LHC-99-008; http://cds.cern.ch/record/407316/files/lhc-99-008.pdf; http://cds.cern.ch/record/407316/files/lhc-99-008.ps.gz;

Imported from Invenio. Momal, F Integrating the Latest Technologies into a Java Process Control MMI The LHC/IAS (equipment control) Group is developing supervisory systems by means of industrial SCADA packages. For the past four years, we have provided Web remote access to the data coming from our supervisory and control systems. Combining our findings, an architecture and a strategy have been set-up for a generic Java interface which offers a remote and unique access to all kinds of control data. Using the object-oriented technology, the architecture dissociates the data access layer from the presentation one. Thus, the interface may be used to access different types of data. The data are stored in the interface together with a set of related information (acquisition date, unit, etc.). The graphical interface is based on components which may be stored independently and which can be accessed on demand. Attention has been given to easing the integration of commercial components. To help non-specialists in creating components, a graphical scripting language has been developed. eng 1999

http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=CERN-LHC-99-006; http://cds.cern.ch/record/407315/files/lhc-99-006.pdf; http://cds.cern.ch/record/407315/files/lhc-99-006.ps.gz;

Imported from Invenio.