programmable logic controller presentation

RADHARAMAN GROUP OF INTITUTION
(Programmable Logic Controller)
Presented By
VINAY PARASHAR
(EC) 4th YEAR
RITS
0132EC111119
Guided by:
Mr. Ranjeet Prajapati
Asst. Professor (RITS)

Contents
What is PLC?
 History of PLC
Major components of PLC
 Programming languages of PLC
Modes of connection
 Images of Actual PLC connections
How to create connection and interface
 Exercises on ladder logic
Advantages
 Disadvantages
Applications
Leading brands of PLC

PLC is a digital computer designed for multiple inputs and
output arrangements, extended temperature ranges,
immunity to electrical noise, and resistance to vibration
and impact. A PLC is an example of a real time system.

PLC was introduced in late 1960’s
First commercial & successful Programmable Logic
Controllers was designed and developed by Modicon as a
relay replacer for General Motors.
Earlier, it was a machine with thousands of electronic parts.
Later ,in late 1970’s,the microprocessor became reality &
greatly enhanced the role of PLC permitting it to evolve form
simply relay to the sophisticated system as it is today.

5
Major Components of a Common PLC
POWER
SUPPLY
PROCESSOR
I M
N O
P D
U U
T L
E
O M
U O
T D
P U
U L
T E
PROGRAMMING
DEVICE
From
SENSORS
Pushbuttons,
contacts,
limit switches,
etc.
To
OUTPUT
Solenoids,
contactors,
alarms
etc.

6
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.
PROCESSOR
Provides intelligence to command and govern the activities of the entire
PLC systems.
PROGRAMMING DEVICE
Used to enter the desired program that will determine the sequence of
operation and control of process equipment or driven machine.

Programming Languages of PLC
Most common languages encountered in PLC
programming are:
1) Ladder Logic
2) Functional Block Diagram
3) Sequential Function Chart
4) Boolean mnemonics

EXACT IMAGE OF SIMULATION PANEL

Exact image of i/o MODULE AND SIMULATION
PANEL

programmable logic controller presentation

1.With the programming cable plugged in, you can check for proper operation by
clicking on the Accessible Nodes icon.

DOWNLOADING THE
PROGRAM TO THE MODULE

Ladder Logic
 The ladder logic is the oldest programming
language for PLC.
 It is well suited to express Combinational
logic.
The main ladder logic symbols represent the
elements :
make contact
break contact
relay coil

Truth Table for EX-1
s.no SWITCH S1
I0.0
SWITCH S2
I0.1
OUTPUT
LAMP
Q4.0
(on/off )
01 OFF OFF OFF
02 OFF ON ON
03 ON OFF ON
04 ON ON ON

S1
(I0.0)
AND Gate
S2
(I0.1)
Output
Q4.0
OFF
OFF
ON
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
s1 s2 lamp
S1
(I0.0)
S2
(I0.1)
Output
Q4.0
OFF
OFF
ON
ON
OFF
ON
OFF
ON
OFF
ON
ON
ON
OR Gate
s1
s2
lamp

EXCERSICE -2 (NOR GATE)
S1
(I0.0)
s1 s2 output
S2
(I0.1)
Output
(Q4.0)
OFF
OFF
ON
ON
OFF
ON
OFF
ON
ON
OFF
OFF
OFF

EXCERSICE-3 (NAND)
lamp
S1
S2
S1
(I0.0)
S2
(I0.1)
Output
Q4.0
OFF
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
ON
OFF

Ladder Logic Program for Start/Stop of Motor :
X1 X2
Y1
Y1

 Reliability.
 Flexibility in programming and reprogramming.
 Cost effective for controlling complex systems.
 Small physical size, shorter project time.
 High speed of operation.
 Ability to communicate with computer systems in the
plant.
 Ease of maintenance /troubleshooting.
 Reduced space.
 Energy saving.

Disadvantages of PLCs
PLC devices are proprietary it means that part or
software of one manufacturer can’t be used in
combination with parts of another manufacturer.
Limited design and cost option
Fixed Circuit Operations.
PLCs manufacturers offer only closed architectures.

Wherever automation is desired the PLCs are best
suited to meet the task.
Few examples of industries where PLCs are used :
1) Robots manufacturing and control
2) Car park control
3) Train control station system
4) Food processing
5) Materials handling
6)Machine tools
7)Conveyer system etc.

24
Leading Brands Of PLC
AMERICAN 1. Allen Bradley
2. Gould Modicon
3. Texas Instruments
4. General Electric
5. Westinghouse
6. Cutter Hammer
7. Square D
EUROPEAN 1. Siemens
2. Klockner & Mouller
3. Festo
4. Telemechanique

Thank You!!!
GUIDED BY:
Mr. RANJEET PRAJAPATI
(ASST. PROFESSOR)
R.I.T.S
Helped by :
Mr. SAURABH KHARE
(course coordinator )
C.R.I.S.P INDIA

programmable logic controller presentation

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programmable logic controller presentation