Dalesio, L. R.

Paper	Title	Page
MOPA03	Redundancy for EPICS IOCs	26
	L. R. Dalesio SLAC, Menlo Park, California G. Liu, B. Schoeneburg, M. R. Clausen DESY, Hamburg
	High availability is driving the reliability demands for today’s control systems. Commercial control systems are tackling these requirements by redundant implementations of major components. Design and implementation of redundant Input Output Controllers (IOCs) for EPICS will open new control regimes also for the EPICS collaboration. The origin of this development is the new XFEL project at DESY. The demands on the availability for the machine uptime are extremely high (99.8%) and can only be achieved if all the utility supplies are permanently available 24/7. This paper will describe the implementation of redundant EPICS IOCs at DESY that shall replace the existing redundant commercial systems for cryogenic controls. Special technical solutions are necessary to synchronize continuous control process databases (e.g., PID). Synchronization of sequence programs demands similar technical solutions. All of these update mechanisms must be supervised by a redundancy monitor task (RMT) that implements a hard-coded expert system that has to fulfill the essential failover criteria: A failover may only occur if the new state is providing more reliable operations than the current state.
	Slides
TPPB41	NSLS II Control System Overview	253
	L. R. Dalesio SLAC, Menlo Park, California
	The NSLS II is a new light source to be built at Brookhaven National Laboratory. The control system tools will be started this year. Technical areas of interest to improve productivity, maintainability, and performance, include Relational Database tools to support all aspects of the project, online Bbam modelling, intelligent distributed device controllers, and engineering and operation tools. We will discuss our goals and projects to make progress in these areas.
FOPA02	EPICS – Future Plans	728
	L. R. Dalesio SLAC, Menlo Park, California J. O. Hill LANL, Los Alamos, New Mexico K.-U. Kasemir ORNL, Oak Ridge, Tennessee T. Korhonen PSI, Villigen M. R. Kraimer ANL, Argonne, Illinois M. R. Clausen DESY, Hamburg
	Over the last two decades EPICS has evolved from a basic set of control applications created for the Ground Test Accelerator to a rich and reliable control system framework installed in more than 120 locations worldwide. The continuous development of EPICS is supported by the worldwide collaboration and coordinated by a set of major laboratories. This procedure ensures continuous quality checking and thus leads to stable production versions. The clear separation of the robust core software on the Input Output Controllers (IOCs) from the channel access protocol and the applications running on workstations and servers allows nearly independent software developments on all three levels. This paper will describe the new developments on the IOC side, which will increase the robustness by adding redundancy or will improve the management and the functionality. This includes the vision of a new Java-based IOC. The support for new data types will bring more flexibility to the channel access protocol. New developments on the application side are clearly indicating that Java and Eclipse (e.g., Control System Studio – CSS, XAL and others) will form the basis for many future applications.
	Slides