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Use of HMI devices and SCADA systems
By
Dr. Palitha Dassanayake
Content Operator Panels SCADA systems
HMI devices
HMI device(operator panel)
ComputerPLC
Communication
Communicating with operator panels
PLC
Operator Panel
Parallel connectionsStraight forwardEach operator panelOutput is connected to PLC input and vice versa
The number of I/O increases
Operator Panel connected in parallel
with a PLC
S1 S2 S3 S4
S1, S2 etc are switches
B1 B2 B3 B4 B5
B1, B2 etc are bulbs or indicators
Simple Example
Entrance block PT1 PT2
Side block
Stopping device
Tile feeding
Motor PR2 PR1Elevator Production line
Auto
Man
T1 T2
IT2
T3
IT3
T4IPR1 IPR2
T5
IT5
T6
IS4
T7
IT7
IPT1 IPT2
Operator Panel
Limitations1. You need additional input in the PLC for each operator switch2. You need additional output in the PLC for each indicator3. Operators has to remember the meaning of each indicator 4. All possible error messages will be limited to bulbs5. It is difficult to arrange for the operator to insert numerical values
Advantageous1. Simple to use and construct as well as maintain2. Less cost3. No additional programming requirement as in serially connected ones4. No requirement to match the PLC with the operator panel
Types of Controllers and Monitors
CPU and I/O modules in builtCPU and Operator panel in built
Types of Operator panels
Graphical User interface
Text displayonly+key board
Monitor +Key board
Touch panels
Siemens COROS Operator Panel(Two Line text display)
Communicating with operator panels
PLC
Operator Panel
Serial connectionNo additional I/O of PLCRequiredOperator panel has its ownSoftware for communication
Text only
GUI interface
Programming an Operator Panel
User friendly software are available. The programmerdoes not need to bother about data communication withthe PLC. It is taken care of by the software
Programmer needs to design the operator panel, textdisplay graphical displays, error messages etc.
Programming Continued
Stamp1 Stamp2
No. of Stamp1= input field No. of Stamp2= input field
Current no. of Stamp1= output field Current no. of Stamp2= output field
MB1
MB2
MB3
MB4
In the PLC program C1
MB1
UP
R
PV
C2
MB2
UP
R
PV
LD C1T MB3
LD C2T MB4
Ability to use more than one Display
Screen 1 Press a function KeyOr arrow key
Screen 2
Example
Sorting Table
Left conveyor
Right conveyor
ms2 ms3 ms4
ms5 ms6 ms7 ms8
Light ms9
Left conveyor sorting table panel
ms10 ms11 ms12
ms13 ms14 ms15 ms16
Light ms17
Right conveyor sorting table panel
ps1
Ps2
Ps4
Ps3
is13
is14
After Sorting Table
ps5
pb1 uv1
ps6
Stackers pxs1
(I 8.4)
(I 9.2)
(I 9.0)
(I 10.2)
(I 10.0)
Stacker 1Stacker 2Stacker 3Stacker 4Stacker 5Pxs2
ps7ps8ps9ps10ps11
is4 is3 is2 is1is5
ps14
ps12
ps13
(I.5.0)(I.5.1)(I.5.2)(I.5.3)(I.5.4)
(I.7.0)(I.7.1)(I.7.2)(I.7.3)(I.7.4)
(I 10.1)
(I.14.7)
(I.14.0)
(I.14.2)
Gripper
pb4 pb5
is10is8is9
is7is6
pb2 pb3
ps15
Is12 Is11
ms1Pusher
(I.14.4)(I.14.6)
(I.13.3)(I 13.4)
(I 13.5)
(I 13.0) (I 13.1) & (I 13.2)
(I 12.3)
(I 12.2) (I 12.2)
(I 12.1) (I 12.0)
(I 12.4)
F5 F6 F7 F8F1 F2 F3 F4
F13 F14 F15 F16F9 F10 F11 F12
Date :2006.07.10
ItalyStackers Condition
Time:_._
Numbers changes with time
Stacker
Stack code
Tile charge
Enable
Stacker Number to be setting : 0
Tile Number to be setting : 0
1 2 3 4 5 6 7 8 9 10 11 12 13 1 1 2 3 1 0 0 0 0 0 0 0 0 20 16 08 14 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0
Function Key 2
F5 F6 F7 F8F1 F2 F3 F4
F13 F14 F15 F16F9 F10 F11 F12
Date :2006.07.10
ItalySorting Line
AlarmsTime:_._
SQ27 SQ28SQ19
SQ44 SQ26
B1SQ1
B2SQ2
B3SQ3
B4SQ4
B5SQ5
B6SQ6
B7SQ7
B8SQ8
B9SQ9
B10SQ10
B11SQ11
B12SQ12
B23 B23B19B20
SQ
SQ23
Function F1
SCADA SystemAcronym for supervisory control and data acquisition, a computer system for gathering and analyzing real time data. SCADA systems are used to monitor and control a plant or equipment in industries such as telecommunications, water and waste control, energy, oil and gas refining and transportation. A SCADA system gathers information, such as where a leak on a pipeline has occurred, transfers the information back to a central site, alerting the home station that the leak has occurred, carrying out necessary analysis and control, such as determining if the leak is critical, and displaying the information in a logical and organized fashion. SCADA systems can be relatively simple, such as one that monitors environmental conditions of a small office building, or incredibly complex, such as a system that monitors all the activity in a nuclear power plant or the activity of a municipal water system. SCADA systems were first used in the 1960s.
SCADA systemSupervisory Control and Data Acquisition System
1. Graphics You can visualize the system from the control room
2. SCADA ServerAlarm detection and scaling function
3. Alarm/EventsReal time processing with alarm and events
4. Multiple Trends
SCADA system contd.Supervisory Control and Data Acquisition System
5. Communication Serial, parallel TPC, IP based network
6. ReportingAlarm detection and scaling function
7. InterfacesSupport for various interfaces, open protocol
8. Time synchronization
More facilities1. Calculation facilities 2. Historical record and trend facilities 3. Connect with external interfaces 4. Connectivity
Price of the software depends on Software pointsFacilities includedEnd user license or development type
SCADA Architectures
First Generation – MonolithicComputing was done in mainframes and network did not existNo connectivity to other systems
Second Generation – DistributedThe processing was distributed across multiple stations thatare connected via LAN and share the information real time.
Third Generation – NetworkedThe current generations that used open system architectures,Open protocols, distributing connectivity across WAN
Complete system
PLCCPU
I/OModules
Sensor informationActuators and Motors
OperatorPanel
LocalControl
Server Centrally controlled
SCADA could be centrally controlled or/and locally controlled
Complete system Contd.
PLCCPU
I/OModules
OperatorPanel
SoftwareFor PLC programming
Software for operatorpanel
SCADA software (Open protocol available)
END
