1. Computer Sciences & Engineering Department
SCADA
Supervisory Control And Data Acquisition
Ramtin Raji Kermani
Fall 2005
Computer Sciences & Engineering Department
Shiraz University

2. SCADA Road Map: What is a Control System? What is SCADA ?
Supervisory Control And Data Acquisition
Road Map:
What is a Control System?
What is SCADA ?
Where and why SCADA is used?
SCADA architecture
Components of SCADA
Security issues
Modern features

3. SCADA First of all, Lets see what is a Control System ?
Supervisory Control And Data Acquisition
First of all, Lets see what is a Control System ?
A control system, is a system that holds responsible in top of another system (being controlled system) for setting and stabling the system in a predefined state.
Nowadays control systems are mostly microprocessor based. (Microcontrollers, PLCs, PC-Based Control systems).
Sensor
Process being controlled
Actuator
Controller System

4. SCADA
Supervisory Control And Data Acquisition
Example of a monitoring and control system is a system which monitors temperature and switches heaters on and off.

5. SCADA
Supervisory Control And Data Acquisition
What is SCADA?
SCADA is “Supervisory Control And Data Acquisition”.
Real-time industrial process control systems used to centrally
monitor and control remote or local industrial equipment such as
motors, valves, pumps, relays, sensors, etc.
SCADA is Combination of telemetry and Data Acquisition.
SCADA is not just a hardware, neither a software. It’s a concept,
it’s a system as a combination of special hardware, software and
protocols.
SCADA is used to control chemical plant processes, oil and gas
pipelines, electrical generation and transmission equipment,
manufacturing facilities, water purification and
distribution infrastructure, etc.

6. SCADA Why SCADA is needed ?
Supervisory Control And Data Acquisition
Why SCADA is needed ?
The Ability to Remotely collect different plants on different places.
The Ability to control process from a distance.
The Ability to create logs and reports about system’s current and past state.
The Ability to send necessary information to Engineers and operators in
real-time using Instant Messaging and SMS.

7. SCADA Where SCADA is used ? Electrical generation/distribution,
Supervisory Control And Data Acquisition
Where SCADA is used ?
Electrical generation/distribution,
Natural gas distribution
Fuel Oil storage & flow
Water storage & flow
Lighting
Heating, cooling, ventilation
Fire alarms & suppression
Elevators & escalators
Gates & doors, alarms
Video security cameras
Traffic signals
Process Line Control

8. SCADA SCADA is not a new stuff !
Supervisory Control And Data Acquisition
SCADA is not a new stuff !
It has been used since the early days of control systems to
remotely Control and Monitor current and past state of being
controlled system (our plant, factory, etc.)

9. SCADA Early Power System Control (in 1919) Control room (mimic wall)
Supervisory Control And Data Acquisition
Early Power System Control (in 1919)
Control room
(mimic wall)
1970’s
formerly, all instruments were directly wired to the control room

10. SCADA Late 1990’s Control Centers
Supervisory Control And Data Acquisition
Late 1990’s Control Centers

11. SCADA A little Confused ?!?! Lets SEE what it is !
Supervisory Control And Data Acquisition
A little Confused ?!?!
Lets SEE what it is !

12. SCADA Remote Terminal Unit (RTU) RTU RTU
Supervisory Control And Data Acquisition
Central Monitoring Unit
Communications
Network
Sensor
Programmable Logic Controller
Fiber, Radio, Modem,
Microwave, Telephone,
Wireless, Powerline Carrier
Remote
Terminal
Unit (RTU)
RTU
RTU

13. SCADA SCADA Hardware Field level instrumentation and control devices
Supervisory Control And Data Acquisition
SCADA Hardware
Field level instrumentation and control devices
Sensing field variables, controlling the process and ….
Remote Terminal Units (RTUs)
Send control and monitoring data to MTU. (could be a PLC)
Master Terminal Unit or MTU (Also called The Master Station)
gathering information from RTUs, Monitoring and processing,
sending necessary control actions to RTUs.
Communication System

14. SCADA Going a little more in details …
Supervisory Control And Data Acquisition
Going a little more in details …

15. Central Monitoring Station
SCADA
Supervisory Control And Data Acquisition
Communication
Network
Instrumentation
Remote Station
Central Monitoring Station
LAN, WAN, INTERNET
Corporate Architecture

16. SCADA What are the concerns ? Physical Plant Computer Networking
Supervisory Control And Data Acquisition
What are the concerns ?
Physical Plant
Computer Networking
Focus
Safety
100% Availability
Electro-mechanical
No updating, Aged equipment
The Language
RTUs, PLCs, IEDs
DNP, Modbus
Low Bandwidth
Analog & Digital
The Vendors
Allen Bradley(AB)/Rockwell, Honeywell, Siemens, Johnson Controls
Security
99.5% Availability
Electronic
Continuous Updating, New
Routers, Switches, Servers
IP, Ethernet
High Bandwidth
All Digital
IBM, Microsoft, CISCO, Dell

17. SCADA Protocols used in SCADA Systems:
Supervisory Control And Data Acquisition
Protocols used in SCADA Systems:
Mostly Open Protocol are used in SCADA systems.
The most popular protocols are as follows:
DNP (Distributed Network Protocol)
Modbus
DeviceNet

18. SCADA SCADA Functionality: - Data acquisition and display
Supervisory Control And Data Acquisition
SCADA Functionality:
- Data acquisition and display
store binary & analog data into process data base
- Alarm & Events
record important changes and operator actions
- History data base
keep a record of the process values
- Measured processing
calculate derived values (limit supervision, trending)
- Logging & reporting
- Human Machine Interface (HMI):
graphical object state presentation, lists, reports
- Operator Command handling
binary commands, set points
recipes, batches, scripts (command procedures)

19. SCADA Remote Monitoring including:
Supervisory Control And Data Acquisition
Remote Monitoring including:
Alarms and events
Current state
Trends and history

20. SCADA What is an alarm, an event ?
Supervisory Control And Data Acquisition
What is an alarm, an event ?
A&E consider changes occurring in the plant (process) or in the control system
(operator actions, configuration changes,…) that merit to be recorded.
Recorded changes can be of three kinds:
- informative: no action required (e.g. "production terminated at 11:09")
- warning: plant could stop or be damaged if no corrective action is taken "soon" (e.g. “fuel low")
- blocking: the controller took action to protect the plant and further operation is prevented until the reason is cleared (e.g. “Temperature too high")
An event is a change related to: operator actions ("grid synchronisation performed at 14:35"),
configuration changes ("new software loaded in controller 21"), and system errors ("no life sign from controller B3")

21. SCADA Implementing alarms by variables
Supervisory Control And Data Acquisition
Implementing alarms by variables
An alarm is often encoded as a simple 16-bit word sent by an object (thru PLC) in the plant.
Each bit has a different meaning, the error condition is reset when the word is 0.
[120] low oil pressure
121] low water level
[122] trajectory error
[123] synchronisation error
[123] tool error
[131] robot %R1% not ready …
word

22. SCADA New Trends in SCADA Web-Based SCADA systems
Supervisory Control And Data Acquisition
New Trends in SCADA
Web-Based SCADA systems
Connecting SCADA system to Internet
Gives more functionality to our system
Security issues should be covered
Using Instant Messaging to report systems status (implemented)
Giving more functionality
Using a reliable instant messaging service
Using Short Message Service to report critical situations (implemented)
A kind of instant messaging, using Mobile Telecommunication network
Using SMS Server, connecting a cell to PC, setting up a web server and
using WAP

23. SCADA Instant Messaging for SCADA
Supervisory Control And Data Acquisition
Instant Messaging for SCADA
Facilitate the remote monitor and control by utilizing the secure IM
Instant Messaging (IM) is a type of communications service over the Internet that enables individuals to exchange text messages and track availability of a list of users in real-time.
By taking advantage of the near real time feature of IM and richness of the IM presence, we bring forward a secure IM based remote monitor and control system.
LDAP-based device and system management
Lightweight Directory Access Protocol (LDAP) [6] specifically targeted at management applications and browser applications that provide read/write interactive access to directories.

24. IM Architecture for SCADA
Supervisory Control And Data Acquisition
IM Architecture for SCADA

25. A simple IM based remote monitor/control interface
SCADA
Supervisory Control And Data Acquisition
A simple IM based remote monitor/control interface

26. SCADA SCADA on mobile phone
Supervisory Control And Data Acquisition
SCADA on mobile phone
The system allows you to use your mobile phone to monitor and control your process from any location. More versatile than a pager system.
You can get detailed alarm messages about any event that occurs in your business.
The application has been written in J2ME
The refresh time is about 2 s
Java application in mobile phone transfers data to/from WWW server.

27. SCADA
Supervisory Control And Data Acquisition

28. SCADA
Supervisory Control And Data Acquisition

29. SCADA Last words on SCADA
Supervisory Control And Data Acquisition
Last words on SCADA
With new trends and technologies of Computer and Electrical
Engineering, there are lots of functionalities available, that we can add to our SCADA system.
You saw that SCADA covers different fields of Computer Engineering like Computer networking, Control, Programming, Embedded Systems, Operating Systems, Real-time Systems and ….
SCADA is a very fast growing technology which is widely used in plants and factories and makes good job opportunities for you in the industry, in computer engineering field..

30. SCADA References: www.google.com www.wikipedia.com www.whatis.com
Supervisory Control And Data Acquisition
References:
Modern SCADA protocols, Elsevier, newness publication
DESY SCADA Experience, EPICS Workshop - Oak Ridge
Engineering The Architecture Of Distributed Control Systems, Eric Runnerstrom
MPR Associates
Joint Program Office for Special Technology Countermeasures, National Defense Industrial Association
15-17 July 2003

31. Ramtin Raji Kermani, Fall 2005
SCADA
Supervisory Control And Data Acquisition
Questions ?
Comments?
Thanks for coming …
Ramtin Raji Kermani, Fall 2005