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alarms, operator actions, informational messages, reporting and tracking/auditing messages. • OPC Historical Data (OPC HDA) - Provides access to data already stored, from a simple serial data logging system to a complex SCADA system, historical archives can be retrieved in a uniform manner [20]. As presented in [1], a typical SCADA application using the OPC protocol is shown Figure 2-9, the purpose of OPC is to define a common interface that is developed once and then reused by the different layers of the SCADA application. The OPC server provides an interface for software packages to access data from process devices such as PLC, DCS and RTU etc. Then Figure 2-8 shows a SCADA application using different protocols between software modules. This is a classical SCADA interconnection of different software modules where a custom interface or driver for an individual software module is developed for interfacing with other software modules. Figure 2-8: A general SCADA software application with a lot of different protocols between software modules [1] 30
Figure 2-9: SCADA Application using OPC as protocol for interconnection [1] 2.8 Four-tank process The four-tank process model consists of four interconnected cylindrical tanks, two pumps, two valves and two level sensors which are connected to the lower tanks. The four cylindrical tanks are mounted vertically on a frame in a two by two symmetric pattern as shown in Figure 2-10. Each tank has a 20 cm height and 6 cm inner diameter; two level sensors are mounted at the bottom of each of the lower tanks. The system is designed as a portable unit where the surface 1 can be attached to the reservoir to form a brief case structure. As shown in Figure 2-11, the piping of the system is such that the output of Pump02 feeds Tank 1 and Tank 4 via Valve 1 (three-way valve). Similarly, output of Pump01 feeds Tank 2 and Tank 3 via Valve 2 (three-way valve). The leakages from Tank 4 and Tank 3 flow into Tank 2 and Tank 1 respectively. The levels of Tank 1 and tank 2 are measured by the level sensors mounted at the bottom of each tank but the levels of Tank 4 and Tank 3 are not measured. 1 This surface is formed by the combination of the four tanks and the frame on which they are mounted. 31
Page 1 and 2: Project report 2010 Candidates: Tit
Page 3 and 4: Table of contents ABSTRACT: .......
Page 5 and 6: B1: System Sequence Diagrams (SSD).
Page 7 and 8: Nomenclature This section gives a l
Page 9 and 10: Overview of tables and figures Figu
Page 11 and 12: Figure B. 14: Sequence diagram of t
Page 13 and 14: 1 INTRODUCTION SCADA systems are wi
Page 15 and 16: OPC Foundation defines the standard
Page 17 and 18: 2.1.2.2 Human Machine Interface The
Page 19 and 20: 2. Communications infrastructure: T
Page 21 and 22: system architecture (not vendor dep
Page 23 and 24: As far as new technologies are conc
Page 25 and 26: Figure 2-4: The main functions of a
Page 27 and 28: In order to define the button behav
Page 29: service hosted in an application or
Page 33 and 34: Tank 3 Tank 4 Three - way valve-2 T
Page 35 and 36: Figure 2-13: NI USB-6008 DAQ device
Page 37 and 38: Area of the drain in tank i 0.16, 0
Page 39 and 40: Figure 2-16: Example of SCADA syste
Page 41 and 42: Figure 2-17: Diagram of real time d
Page 43 and 44: 3 ANALYSIS OF SOFTWARE This section
Page 45 and 46: Control Application SCADA server Sy
Page 47 and 48: 4 SYSTEM DESIGN 4.1 Design of Softw
Page 49 and 50: 4.2.4 Configuration page The config
Page 51 and 52: Figure 4-7: Design of the control a
Page 53 and 54: 4.2.8 Configure report page When th
Page 55 and 56: access level only permits the opera
Page 57 and 58: Figure 4-13: Database model adopted
Page 59 and 60: Figure 5-2: The configuration backu
Page 61 and 62: Figure 5-4: The control application
Page 63 and 64: } To write to multiple channels, th
Page 65 and 66: The code that t2 triggers (Tick2) c
Page 67 and 68: Figure 5-6: Controller configuratio
Page 69 and 70: } Configuration = e.Result.ToArray(
Page 71 and 72: The UserLevel variable is provided
Page 73 and 74: Figure 5-12: Setpoint configuration
Page 75 and 76: 5.4.1 Unit Test The unit tests were
Page 77 and 78: correct tables in the database. Tes
Page 79 and 80: 6 DEPLOYMENT This section gives an
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There are two different ways of upd
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• Introducing students to the pro
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[27] http://databases.about.com/cs/
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APPENDICES Appendix A: Task Descrip
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System : Timer : Sensors 1 : CheckW
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System : Admin 1 : Login() 2 : Conf
Page 95 and 96:
B2: Fully Dressed Use Case Document
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Table B. 4: FDUCD of SQL Use case S
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B3: Sequence Diagram PowerUp initia
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Power up : Control Algorithm Read S
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Power Up Alarm system SQL Operator
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PowerUp : Reporting : SQL : Printer
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B5: Object Diagram Configuration Fi
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CREATE TABLE [TagTask] ( [TagId] [i
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SELECT dbo.Controller.ControllerId,
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UPDATE Task SET Task = @WriteTask2
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CREATE VIEW MonitorTags(Valve1,Valv
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