SCADA

Supervisory Control and Data Acquisition

Contents

Module (0) Getting Started

Module (1) Tags and Tag Logging

Module (2) Graphic Designer

Module (3) Message Display and Archiving

Module (4) Trends and Archiving System.

Module (5) Global Scripting (C-Script)

Module (6) Graduation Project

Objectives

Module (0) Getting Started

1. Definition of SCADA.

2. Benefits of SCADA.

3. Components of SCADA System.

4. Typical Configuration of SCADA System.

Module (1) Tags and Tag Logging

1. Creating Project.

2. Installing Communication Driver.

3. Configuring Tags.

4. Tag Simulation

5. Coupling with a PLC.

6. Cross Reference.

Module (2) Graphic Designer

1. Getting Introduced to Graphic Designer.

2. Creating Screens.

3. Graphic Libraries and Objects.

4. Interface Configuration.

5. Project Running, Auto-start and Exit.

Module (3) Message Display and Archiving

1. The Advantage of Messaging System.

2. Configure Messages.

3. Define Message Classes and Types.

4. WinCC Alarm Control.

5. Message Archiving.

6. Acknowledgment Concept.

Module (4) Trends and Archiving System.

1. Measuring Analog Signal.

2. Trend Display.

3. Archiving System.

4. Tag Logging.

5. Trend Analysis.

Module (5) Global Scripting (C-Script)

1. Global Scripting Introduction

2. Project Functions.

3. Internal Functions.

4. Examples: Motor Switching ON/OFF, Scaling Function,

Playing Alarm Sound,

Module (0) Getting Started

1. Definition of SCADA.

2. Benefits of SCADA.

3. Components of SCADA System.

4. Typical Configuration of SCADA System.

Definition of SCADA

SCADA is an abbreviation of

“Supervisory Control & Data Acquisition”

SCADA refers to the combination of Telemetry and Data

Acquisition.

Its Functions

1. Collecting Information 2. Transferring it back to the

central site

3. Carrying out necessary

analysis and control

4. Displaying this data on a

number of operator screens

What is meant by Telemetry?

It is a technique used in transmitting and receiving information or

data over a medium.

The Information can be

Measurements such as Voltage Speed or Flow.

Control Actions such as Open % for a valve or ON/OFF Signals.

The Medium Can be,

Cable, Telephone or radio

Information can be from One Location or Multiple Locations.

What is meant by Data Acquisition?

DA refers to the method used to access and control

information or data from the equipment being controlled and

monitored.

The Data accessed are then forwarded onto a telemetry

system ready for being transferred to the different sites.

Data accessed can be analog and digital information gathered

by sensors,

Flow-meter, Encoders or Current transformers

It also can be Control Actions for,

Actuators, Relays, Valves, Motors, etc.

Benefits of SCADA

Allows an operator at a master facility to monitor and control processes that are distributed among various remote sites.

Eliminating the need for service personnel to visit each site for inspection.

Data collection/logging or make adjustments.

Real-time monitoring, system modifications, troubleshooting, increased equipment life, automatic report generating.

Other benefits SCADA Systems provide:

1.Reduces operational costs

2.Provides immediate knowledge of system performance

3.Improves system efficiency and performance

4.Increases equipment life

5.Reduces number of man-hours (labor costs) required for troubleshooting or service

6.Facilitates compliance with regulatory agencies through automated report generating

Components of SCADA System

1. Master Terminal Unit (MTU)

2. Remote Terminal Unit (MTU)

3. Communication Network

4. SCADA Software

Master Terminal Unit (MTU)

- MTU is the master or heart of a SCADA system and is

located at the operator’s central control facility.

- Data from remote field devices (pumps, valves, alarms,

etc.) is sent to the MTU to be processed, stored and/or sent

to other systems.

For example,

The MTU may send the data to the operator’s display

console, store the information, and then send an operator’s

initiate command to a field pump’s RTU.

Remote Terminal Unit (RTU)

- RTU is a controller located at the remote site.

- It gathers data from field devices (pumps, valves, alarms,

etc.) in memory until the MTU initiates a send command.

Communication Network

- There must be uninterrupted, bidirectional communication

between the MTU and the RTU for a SCADA or Data

Acquisition system to function properly.

SCADA Software

- It provides a Human Machine Interface (HMI) allowing the

operator to visualize all the functions as the system is

operating.

- It can be used to change set points, view critical condition

alerts and warnings, and analyze, archive or present data

trends.

- Most of these software packages use standard data

manipulation/presentation tools for reporting and archiving

data and integrate well with Microsoft Excel, Access and

Word.

Configuration of SCADA System

Point to Point Configuration.

One Station Talks directly to another station

Point to Multipoint Configuration.

Master Station talks and acquire data from all other remote

station.

Peer to Peer Configuration.

All Station are connected to each other and data can be

transferred between any two of them directly w/o having an

MTU.