SUUT··

UNIVERSITI MALAYSIA PERLIS

Peperi~ Semester Kedua Sidang Akademik 201312014

21 Mac 2014

DNT 253 Programmable Logic Controller [Pengawal Logik Boleh Atur Cara]

Masa : 3 jam

PleOlle make SWJ> tbB,t this queStion paper has mIRTEEN (13) printed pages including this front page .before ypu ~tarfthe examinatio'l, . [Sila pastikim kiirlas soalan infmengandungi TlGA BELAS (13) muko surat yang bereetak lermasuk muka hadapan s.belurn antia memulakan peperiksaan ini.}

This question paper has SIX (7) questions. Answer ALL questions from PART A and ONE(I) question from PART B and ONE(l) question from PART C Each question contributes 20 marks. (Kerltfs saa/an. ;n; mengilndungi TUJUH (7) soalan. Jawab SEMUA soalan daripada BAHAGIAN A dim.sArU(IJ soa/an daripada BAHAGIAN B dan SATU(I) soalan daripada BAHAGIAN C . Markah bagi tiap-tiap soQJan adalah 20 markak]

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PART A -' Answer ALL questions . [BAHAGIAN A - Jawab SEMUA soalan.}

Question Al [Soa/anAl]

(DNT 2S3) -2 -

(a) Define Programable Logic Controller (PLC) and give THREE (3) types of available PLC in market. ' [Nyatakan definasi Pengawal LogikBoleh Atur Cara (PLC) dan berikan TlGA (3) jenis PLC di

'poscuan]

(b) Sketch an.IlPpropriate diagram to show a PLC system. , {Lakarkan rajahyang bersesuaian bagi menunjukkan sebuah sistem PLC}

(c) Sketch the corresponding switches symbols. [Lakarkan simbol suis yang berkenaan}

'(i) ,Level switch [suisaras]

(ii) Pressure Switch [suis tekanan]

(5 Marks / Markah)

(5 Marks / Markah)

(2 Marks / Markah)

(2 Marks / Markah)

(d) D;aw :a ladder diagram for self latching circuit and describe the program sequence. The ladder diagram should have input and output. Additional internal relay maybe needtxi. ' [Lukiskan, gambarajah tangga untuk litar ingatan dan terangkan .usunan aturcara. Gambarajah tangga seharusnya mempunyai masukan dan keluaran. Geganti dalaman mungkin diperlukan]

(6 Marks / Markah)

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QuestionAl [SOOlan A2 J .

(DNT 253) -3-

(a) List THREE (3) types of input device that can be used in PLC system. [Senarailwn TIGA (3) jenis alai masukan yang boleh digunalwn dalam sistem PLe]

(3 Marks / Marlwh)

(b) Slmplify the' ~mbmation logic gate circuit in Figure 1 and draw it ladder diagram. [Permudahlavi /ilar kombinasi get /ojik dalam Gamborqjoh 1 dan /ukislwn gamborqjoh langga.]

D ~\ E I C ......,--~~i~· -I

F----l

Figure 1 [Gambarajoh 1]

(6 Marks / Marlwh)

A

(c) Convert t1ie following decimal number to Hexadecimal Number. Show all the calculation. [Tulw,1wn nombo, persepu/uh kepada nombor pe,enambe/asan. Tunjuklwn semua pengi,aan.]

i. 18 ii. 260

iii. 350 (6 Marks / Marlwh)

•• .4/-

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-4-

(d) Develop a ladder diagram based on Table 1 and describe the system. /Bangunkan gambafajah tangga berdararkan Jaduall dan /erangkan sistem tersebut.]

(DNT2S3)

(5 Marks / Markah)

Address

0000

0001

0002

0004

0005

'f-D

"D

Table 1 [Jadual J]

lmtntction

AND NOT

OUT

Operand

0000

TlMOOO #200 I

TIM 000

0005

01001

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QuestionA3 {SoaJanAJJ

(DNT253) -5-

(a) List THREE (3) types output device that can be used in PLC system. ,{Senaraikan TIGA. (J) jenis alat keluaran yang boleh digunakan dalam sistem PLC.J

(3 Marks / Markah)

(b) Simplify and sketch the combination logic gate circuit for Boolean equation, Y,;, (AMCD), Draw a ladder diagram and write its pneumonic code. __ {Permudah dan laJ:arkan litar kambinasi get lojik bagi persamaan Boolean. Y = (AB+CD), lukiskan ganibm-~ah 'tangga dan tuliskan 1wd mnemoniknya.]

(6 Marks / Markah)

(c) The break-make pushbutton is used for interlocking control. Sketch the symbol and deScribe its function.

{Putus-buat butang tekan digunakan bagi kawalan kunci perontara. Lukiskan simbolnya dan terangkanfongsinya .J

(4 Marks / Markah)

(d) A. program has to be loaded into PLC system in machine code. What is meant by machine cOde? IPrlJgrtim yang dimasukkan ke sistem PLC adalah dalam bentuk 1wd mesin. Apa yang dimaksudkan clengan 1wd mesin? J

(e) Develop the ladder diagram based on Table 2. {B(Jngunkangambarajllh tangga berdasarlam JaduaJ 2.J

Address

0000

0001

0002

0003

0004

OOOS

ODDS

0008

Table 2 {Jadual2J

Instruction

LDNOT

t4ND

W

ORLD

~D NOT

OR

4NDLD

our

(2 Marks / Markah)

(5 Marks / Markah)

Operand

0000

0001

0003

OOOS

0007

01000 -

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PART B - Answer ONE(l) question only. [BAHAGIAN B - Jawab SATU(I) saalan sahaja]

. QueSfi!)D Bi [Saalan BII .

(DNT253) - 6-

(a) Convert the ladder diagram in Figure 2 to Boolean equation and sketch logic gate circuit. [Tukarkan gambarqjah tangga dolam Gambarqjah 2 upado persamaan baolean dan lakar lilar gel logik}

(4 Marks 1 Markah)

· A B D D

B ~:r I-----iC) Y

A c D

f

Figure 2 {Gambarqjah 2}

(b) Skecth a motor driver circuit using TWO(2) normally open relay to control I motor . The system have TWO(2) switchs for motor direction either clockwise or counter clockwise. Motor is run by 12 V DC and relay is triggered by 6 V DC. (Lakarkan.lilar pemacu motar menggunakan DUA(2) geganti sesentuh biasa lertutup untuA: mengawal 1 ;"0101'. SiS/em iiu· mempunyai DUA(2) sui. untuk mengawal arah pergerakkan molor samada ikul jam alwlawanjam. Motordigerakkan oleh 12 V DC dan geganti dipiev oleh 6 V DC.}

. (6 Marks 1 Markah)

••• 71

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-7-

( c) . Desigll a 'control circuit for a piliging machine, based on the given I/O assigllments in Figure 3. A sensor is used to detect and count the number of products being carried on an assembly line. When it counts 5 products, the circuit energizes a solenoid. The solenoid is energized for a period of 10 seconds and is then shut off, causing it to retract. .

[RekabeTdukkin sebuah litar kawalan bagi mesin pembungkusan. berdasarkan umpukan UO da/am (lambarajah 3. Penderia digunakan un/uk mengesan dan membilang wantiti produk yang dibawa oleh ra/ian pemasangan. Apabila ia mengira J produJc, litar akon men/enaga sebuah solenoid. Solenoid diteflligakiln. selama 10 soat dan kemudian dipirau untuk penarikbailkan.J

·110 AssigtlDlents

B 'I]JUI DevIces 0000 Sensor

Output Devices ·. /000 C011VeYOr /001 Solenoid

(10 Marks / Markoh)

~~ I~" 1000001 11 I I I I II

Figure 3 [Gambarajah 3J

D

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Questio~ Bl . [Soa/an B2J . .

(DNT 153) -8-

(a) List FIVE (5) steps in a systematic approach of control system design using a PLC. [Senaraikon UMA (5) /angkoh dalam pendekoJan bersistemolik bagi merelrabentuk .istem lrawaJan menggunalran PLC.]

(5 Marks / Marlrah)

.. (b) Draw ~iming diagram base on the ladder diagram based in Figure 4. [LUkJskongambarajah tangga berdosarlran Gambarajah 4.J

00000 COWl' .... ' -----, IDDut I

CP

000II2 em 001

r----lll R .... I R I 10 counts

c:NTIlOI 0 !..-.tIl V

Figure 4 {Gambarajah 4J

(5 Marks / Markoh)

... 9/-

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- 9-

(c) Desigr;l a control'circuit for running light system for an array of 5 Bulb. The running light .should has START and STOP button. The correspoding 110 assignment as in Figure S. The ·· bulb will tum OFF when the system in standby mode. Upon start button is pressed, the bulb will ON and OFF one by one in sequence of lOs. It will repeat the sequence until stop button is pressed. [R2k.abentuklran litar knwalan untuk slstem lampu pelayaran untuk tatasusunan 5 Lampu. Sistem lampu pelayaran seharusnya mempunyai suls MULA dan HENrI. VO adalah berdasarkan Gambarajah 5. Semua lampu terpadam dalam keadaan bersedia. Selepas suis mula ditekan lampu qkan menyala dan terpadam satu ckmi satu rialam jujukan lOs. Janya akan berulang sehingga sui. berhentiditekan .] .

[0-0 r:::::-l ~

Start

1'lpUt O{J()(}

0001 :

D(IItiC45 Start Stop

IIulb J IkIlb4

Slap

0Uipul 01000 01001 01002 01003 01004

FigureS [Gambarajah 5]

(10 Marks I Markah)

DtMus Bulb 1 Bulb 2 BuIb3 BuIb4 I BulbS I

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PART C - Answer ONE(l) question only. [BAHAOIAN C -Jawab SATU(J) soalan sahaja}

Question Cl [Soa/an Cl]

(DNT 253) - 10 -

(a) SiInpJify and convert the boolean equation in Figure 6 to a ladder diagram. {Permudah dan tukarkan Ii/ar digitallogik di dalam Gambarqjah 6 kepada gambarajah tangga}.

(5 Marks I Markah)

IA= B ·(C·(D+E+C)+ P·C) Figure 6

(Gambarajah 6]

(b) Design a garage control system as in Figure 7 which consider below rule: • . .The ultrasonic input employed to detect the presence of an approaching

vehicle to door. • A separate photo sensor detects the passing of vehicle via interruption of light

beam. • In response of these signals, the control circuit controls the output that drives

the motor of the door for opening and closing as in Figure 7.

[Rekabentuk .;Stem kawa/an garaj .eperli dolam Gambarajah 7 berdasarkan peraturan dibawah: • Penderta ultrasoniJc yang digunaican akan mengesan kehadiran kenderaan yang

menghampiri pintu.

. Pendetia Cahaya yang dipasang berasingan a/can mengesan kenderaon yang

. melin/asi dengan apJikasi ganguan pada cahaya yang dipancarican.

• Dengan aplikasi kedua-dua penderia litor kawa/an a/can mengawal motor bagi

tujuan buka dan tutup seperti da/am Gambarajah 7.]

(15 Marks I Markah)

•.. 11/-

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JD:.i!t 00.001 00002 00003

- 11 -

. -. ." --

. , Defktli .. . 011 . Cltrawnic switch , 01000 .PhOtoe1o:1ric switch 01001 Door upper limit switch Door tower limit switch

Figure 7 [Gambarajah 7J

(DNT2S3)

mIlA

~kfS .. M«or to raise door Motor to lower door

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Questioo 'C2

[Soalan e2J

-12 -

(ll) Draw a · ladder diagram based on the given timing diagram in Figure 8. [LuJci~kangainbarqjah tangga berdasarkan gambarajah masa yang diberikan dalam Gambarajah 8.J

. (5 Marks / Markah)

Signal (input signal)

Tl

ON/OFF delaY outPut ---'--~ Tl: ON-delay time 1'2: OFF..Jclay

FigureS [Gambarajah 8]

(b) DesignofPaekaging Line Control as in Figure 9 with below rule: .. • When Start Pushbutton (0001) is pressed, the box conveyor (1001) moves.

• Upon detection of box present by Proximity sensor (0002), the Box conveyor (1001) stops and the·Product conveyor (1002) starts after 10 second.

• Photoelectric sensor (0003), will count for 10 products. • When it finish counting .Product conveyor (1002) stops, and box conveyor

(1001) starts again after 10 second. • Counter will be reset and operation repeats until Stop Pushbutton (0004) is

pressed. [Reka frawalan pe.mbunglcusan sepe.rti di dalam Gambarajah 9 bersama peraturan dibawah

o Apahila Sui. "Slar/(OODI) " di lelron. Penyampai unruk Kalak (1001) akan bergerak o Apahila Penderia (00D2) menge.an kehadiran kalak, Penyampai (1001) akan berhenti.

Penyampai produk akan bergerak se/epas 10 saat. o Penderia "Photoelectric "(0003) akan mengira produk sehingga 10. o Apabi/a fa tamat kiraan, Penyampai produk (l002) berhenti, dan talisawat kalak (lOOl akan

bergeraksemuID dalam masa 10 saar. o . Peng/ra akan diresel dan operasi akan berulang sehingga suis henti (0004) ditekan)

(IS Marks / Markah)

... 13/-

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