Scada Functionality for Control Operations of Indus-2

The user interface layer and machine applications for Indus-2 [1] control system runs on commercial Supervisory Control And Data Acquisition (SCADA) and virtual instrumentation packages, to cater with the diversified requirements of different systems involved. On the basis of evaluations performed at CERN [2], it was decided to make use of PVSS-2 (Process Visualization and Supervising System) [3]. This package is based on the concepts of object oriented design, flexible data points, notification, authorization, redundancy, scalability with the use of various managers as per requirements, this package provides the functionality to develop graphical user interfaces (GUI), interface to hardware, data logging, Alarm/event handling, data exchange features etc. We are also using LabView3⁄4 for slow processes like Low Conductivity Water (LCW) plant controls and have provided SCADA like features in it e.g. Alarm/Event handling, Data logging and plotting, configurable control actions, and layering concept to provide zooming. This paper describes the use of commercial SCADA package for the control systems, status of developments and problems faced. INTRODUCTION Indus-2, a 2.5 GeV Synchrotron Radiation Source (SRS) under commissioning at CAT is having three-layer control system architecture [1]. Layer-1 is User Interface Layer (UI) has PC workstations for GUI. Layer-2 is Supervisory Control Layer (SC) has VME stations for supervisory control and Layer-3 is Equipment controller Layer (EC) has VME stations that house various I/O boards. Communication between SC and EC Layers uses Profi field-bus protocol [4]. Each SC station is assigned to one subsystem like power-supply, vacuum, LCW etc. SCs receive commands over TCP/IP from the operator consoles at layer-1. SCADA based application program will run at the layer-1 to supervise all the system activities. PVSS-II [3] is to be used for different subsystems like Magnet Power Supply (MPS), Vacuum, Radio Frequency (RF), beam diagnostics (BDS) Radiation Safety System (RSS) and Timing Control System (TCS). The total numbers of I/O points in the system are 10,000 approximately with a refresh rate of 1 per second at present. It is planned to increase the refresh rate to 4 per second. Connectivity of PVSS to the SC layer is with Application Programming Interface (API) manager, which gets and sets data at periodic interval and applies smoothing and filtering. Commercial database is used for history database and connectivity between PVSS and SQL Server is under development. API manager and Driver manager concepts of PVSS are used extensively to interface different types of instruments, equipments and application software to PVSS over industrial standards like OLE for Process Control (OPC), Modbus and Profi bus. LABVIEW is used in LCW plant control which is having ~1200 I/O points with a refresh rate of 1 sec. This package implements closed loop feedback system to control parameters of the plant, startup condition check and device interlocking and interdependency. Personal computer (PC) failure redundancy is provided in this package with a timeout. When the first system fails control is automatically transferred to the second machine after the timeout. This package is totally modular, configurable and is based on different services which can be run independently send inter service communication is achieved through Global files. *[email protected] 10th ICALEPCS Int. Conf. on Accelerator & Large Expt. Physics Control Systems. Geneva, 10 14 Oct 2005, PO1.098-8 (2005)