ABSTRACT
ICALEPCS 2001

Abstracts



WEDT001 (Talk)

Presenter: Donald Dohan (Argonne National Laboratory)
email: dohan@aps.anl.gov
Review Status: Proceedings Ready - 03/21/02
FullText: pdf
Transparencies: pdf
Eprint: physics/0111084

Decision Support Facility for the APS Control System*

D. A. Dohan

The Advanced Photon Source is now in its fifth year of routine beam production. The EPICS-based control system has entered the point in its life cycle where new control algorithms must be implemented under increasingly stringent operational and reliability requirements. The sheer volume of the control system (~250,000 records, ~135 VME-based input/output controllers (IOCs) and ~7,000,000 lines of EPICS ASCII configuration code), presents a daunting challenge for code maintenance. The present work describes a relational database that provides an integrated view of the interacting components of the entire APS control system, including the IOC low-level logic, the physical wiring documentation, and high-level client applications. The database is extracted ('booted') from the same operational CVS repository as that used to load the active IOCs. It provides site-wide decision support facilities to inspect and trace control flow and to identify client (e.g., user interface) programs involved at any selected point in the front-end logic. The relational database forms a basis for generalized documentation of global control logic and its connection with both the physical I/O and with external high-level applications.
{*} Work supported by US Department of Energy of Basic Energy Sciences under Contract No. W-31-109-ENG-38.
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ICALEPCS 2001

Last updated: September 13, 2002

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