PLC,SCADA AND AUTOMATION Automation

advertisement
PLC,SCADA AND AUTOMATION
Automation
the act of implementing the control of equipment with
advanced technology; usually involving electronic
Hardware. "automation replaces human
workers by machines"
•Increasing Productivity
• Increasing Quality
• Reducing Cost
• Increasing Safety in working conditions
Automation History
Manual
Control
Pneumatic
Control
Electronic
Control using
Logic Gates
Programmable Logic
Controller
Programmable Logic Controller
PLC is an electronics device which interface between
input and output module using software logics such as on-off
, timing , counting , logical operations etc .
The PLC (i.e. Programmable Logic Controller) is a device
that was invented to replace the necessary sequential relay
circuits for machine control.
Examples:-
1. Allen Bradley
2. Siemens
Advantages of PLCs
Reduced space
 Energy saving
 Ease of maintenance
 Economical
 Greater life & reliability
 Shorter project time
 Easier storage, archiving and documentation

10
Major Components of a Common PLC
POWER
SUPPLY
From
SENSORS
I M
N O
P D
U U
T L
E
PROCESSOR
Pushbuttons,
contacts,
limit switches,
etc.
PROGRAMMING
DEVICE
O
U
T
P
U
T
M
O
D
U
L
E
To
OUTPUT
Solenoids,
contactors,
alarms
etc.
Major Components of a Common PLC
POWER SUPPLY
Provides the voltage needed to run the primary PLC
components
I/O MODULES
Provides signal conversion and isolation between
the internal logic- level signals inside the PLC and
the field’s high level signal.
Central Processing Unit
Made of a microprocessor & a memory system
 Reads the input, executes logic, performs
calculations & controls the outputs
accordingly

10
OUTPUTS
INPUTS
MOTOR
CONTACTOR
LAMP
PUSHBUTTONS
PLC
Ladder Logic
• Represents how electrical current flows
through the devices to complete an
electrical circuit
• Each electrical circuit in the diagram is
considered a rung having two components
L1
Rung
PB1 Stop
PB2
Start
M1
Power
Bus
Auxiliary
Holding Contact
L2
Motor
M1
Power
Bus
12
Normally Open
(NO)
Normally Closed
(NC)
NO is true when the input or output status bit controlling the contact is 1.
NC is true when the input or output status bit controlling the contact is 0.
Coils
When a coil is energized it causes a corresponding
output to turn on by changing the state of the status
bit controlling the output to 1.
14
AND OPERATION
A
B
C
Rung
both inputs A and B must be true (1) in order for the output
C to be true (1).
15
OR OPERATION
A
C
Rung
B
In the rung above, it can be seen that either input A or B
is be true (1), or both are true, then the output C is true (1).
NOT OPERATION
A
C
Rung
In the rung above, it can be seen that if input A is be true (1),
then the output C is true (0) or when A is (0), output C is 1.
AB PLC – Addressing I/O
FILE
LETTER
:
I
I
O
O
:
:
:
:
.
1
1
2
2
BIT
NO
WORD
NO
SLOT
NO
.
.
.
.
/
0
1
0
0
/
/
/
/
0 (0 to 15)
0
,,
0
,,
0
,,
15
Addressing BINARY (Flag)
File
Letter
B3
B3
.
.
.
B3
File
Number
:
:
:
:
Word
Number
0
1
.
.
.
15
/
/
/
.
.
.
/
BIT
Number
0 (0 to 15)
0
,,
15
16
Types Of Timers
three types of timer is available :
1. TON
2. TOF
3. RTO
22
Types Of Counters
• two types of counter is available:
1.CTU
2.CTD
23
Compare Blocks
• Equal(EQU)
• Not Equal(NEQ)
• Greater
Than(GEQ)
• Less Than(LEQ)
22
LADDER LOGIC EXAMPLE
SEQUENTIALLY OPERATING THREE
MOTORS WITH DELAY BY USING
TIMER
COADING OF
PROGRAM
Program using COUNTER
An Introduction to SCADA
Fundamentals and
Implementation
• Supervisory Control And
Data Acquisition
WHAT IS SCADA?
• SCADA stands for supervisory control and
data acquisition. As the name indicates it is
not a full control system, but rather focuses
on the supervisory level
• A SCADA program normally runs on a PC
and communicates with external
instrumentation and control devices.
• It’s an optional device used in automation
for continuous monitoring.
27
Common System Components
Sensors and
control relays
Remote
Telemetry Units
SCADA
SCADA Master
Units
Communication
Network
28
Traditional Control
SCADA ? SCADA ?
Supervisory
Control
And
Graphics and Batch processing
Data
Acquisition
Archiving, Logging,
Access Control, Alarms
Distributed database
Data Server
Data Server
PLC’s
Field Bus
Control Programs
9 - 12 Oct. 2000
PCaPAC'2000 - DESY
30
Features
Dynamic Process Graphics
Real Time & Historical Trends
Alarms
Recipe Management
Security
Device Connectivity
Scripts
31
THANK YOU
Download