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Applications : Machine controls, Packaging, Palletizing, Material handling,
similar Sequential task as well as Process control
Advantages of PLC : he! are fast and designed for the rugged industrial
environment"
he! are attractive on Cost#Per#Point $asis"
hese %evices are less Proprietar! & '"g"" (sing )pen $us*nterface"+
hese S!stems are upgraded to add more *ntelligence andCapailities with dedicated P*% and 'thernet Modules"
%isadvantages of PLC : PLC were %esigned for -ela! Logic Ladder and have %ifficult!
with some Smart %evices"
o ma.imize PLC performance and /le.iilit!, a numer of)ptional Modules must e added
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PLC !pes
Nano (Small)
Micro (Medium)
Large
$asic criteria for PLC !pes
Memory Capacity I/O Range
Packaging and Cost per Point
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Central Processing Unit
It is a micro-controller based circuitry. The CPU consists offollowing blocks :
Arithmetic Logic Unit ALU!" Program memory Process image memory Internal memory of CPU! Internal timers and counters #lags
CPU $erforms the task necessary to fulfill the PLC functions.These tasks include %canning" I&' bus traffic control" Programe(ecution" Peri$heral and )(ternal de*ice communication"s$ecial functions or data handling e(ecution and self
diagnostics.
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Output module
These modules act as link between the CPU and the out$utde*ices in the field.
Analog out$ut module : Ty$ical out$ut from these modules is+-, mA" - /
)( : Control /al*e" %$eed" /ibration
1igital out$ut module : Ty$ical out$ut from these modules is ,+/ 1C" 2 / AC" ,3 / AC)(. : %olenoid /al*es" lam$s" Actuators" dam$ers" Pum$ *al*eon off control
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Power Supply
The $ower su$$ly gi*es the *oltage re4uired for electronicsmodule I&' Logic signals" CPU" memory unit and $eri$heral
de*ices! of the PLC from the line su$$ly.
The $ower su$$ly $ro*ides isolation necessary to $rotect thesolid state de*ices from most high *oltage line s$ikes.
As I&' is e($anded" some PLC may re4uire additional $owersu$$lies in order to maintain $ro$er $ower le*els.
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Bus System
It is $ath for the transmission of the signal . 5u system isres$onsible for the signal e(change between $rocessor and I&'
modules
The bus system com$rise of se*eral single line ie wires & tracks
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Sense the Input
Process the Logic
i!e Output
Outputs
Machine
orProcess
Programmable
controller
Inputs
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Programming Terminal
O:0/7
O:0/7
O:1/5
Output Devices
Output Modules
Processor MemorInput Module
Input Devices
!adder Program
O:0/7
O:1/5
I:0/"
I:1/#
O:1/5
I:0/"
I:1/#
I:0/"
I:1/#
Data Input
Image Table
Output
Image Table
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Mid " #$%&s ' iscrete Machine Control
Programming
Terminal
P!$
I/O
$onnection is Point to Point
Programming Language :
- 0elay ladder logic - #le(ibility in altering Control system o$eration
$onnection is Point to Point
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arly " to " Mid #$*& ' iscrete and Process Control
%easonable $omputer
%unning P!$
Programming &o't(are
P!$
I/O
Programming !anguage :
) !adder Program
) PID
) Data &torage
M& ) DO&
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Late 678s to early 668s : 1iscrete and ProcessControl
P$ runningP!$ Programming &o't(are
P!$
I/O
$onnection in net(or*ed allo(ing
Multiple P!$
P!$ became a part o' the
developing enterprise resource
sstem
+indo(s
P!$
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TodayToday::1istributed I&' 9odules1istributed I&' 9odules
1istributed I&' modules
PLC
1istributed I&' scanner
1ata Communication 5us
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Remote
I/O Network
SPLITTERS
FIBER OPTIC LINK
TAPS
RemoteI/O
Today :Today :ot 0edundant %ystemot 0edundant %ystem
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$ontroller $ontroller
$ontroller
$ontroller
+or*station +or*station +or*station +or*station
&(itched ,ub
Today :Today :)thernet Technology in PLCs)thernet Technology in PLCs
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%emote
Plat'orm
+ireless Modem
+ireless Modem
P!$
, M IDispla
P$
Today :Today :;ireless communication;ireless communication
P!$
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Siemens S+ "##&,- ##+,- #.+,
S% " &&- .&&- 0&&
Allen $radle! Micrologi1 #&&&- #&&- #+&&
SLC +/- +/&- +/&.
PLC +/#&- +/+ and +/0&
Modicon Nano Micro
Premium
2uantum
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8 Analog Inputs Analog Output
!p/"own FastCounter
!p Counter
Programm#ng Term#nal PC Conne$t#on
!n#telwa% Port &or $onne$t#ono& up to ' Sla(es
PC)CIA memor% e*pans#on port
PC)CIA $ommun#$at#ons port
TS+,-.
Bu#lt #n 0#spla% &or I/O1#n.ra$k2 AS.#3 an0 "#ag
I/O )o0ules
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CP!
E*ternal Power
Suppl%
I/O )o0ules
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CP!
Power Suppl%I/O )o0ules
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CP!
I/O )o0ules Ba$k plane
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3he open- manu4acturer"independent
programming standard 4or automation is IC 5##.#".6 7ou
can thus choose 8hat con4iguration inter4ace you 8ish to
use 8hen 8riting your application '
Ladder iagram
Instruction List
9unction :lock iagram Se;uential 9unction Chart
Structured 3e1t
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Cost o4 hard8are- so4t8are- Integration ngineering- esign-Installation- Start"up and Commissioning-