EJ501: PLC & AUTOMATION

Transcription

1 SECTION A: 20 MARKS BAHAGIAN A: 20 MARKAH INSTRUCTION: This section consists of TEN (10) structured questions. Answer ALL questions. ARAHAN : Bahagian ini mengandungi SEPULUH (10) soalan berstruktur. Jawab SEMUA soalan. QUESTION 1 Compare the applications of Fixed Automation System and Flexible Automation System usage in industry. SOALAN 1 Bezakan di antara aplikasi sistem automasi tetap dengan sistem automasi fleksibel dalam industri. QUESTION 2 List FOUR(4) advantages of Electromechanical Relay. SOALAN 2 Senaraikan EMPAT( 4) kelebihan bagi geganti elektromekanika. QUESTION 3 Give the typical physical phenomena that are detected by the logical sensor listed below. Inductive proximity Capacitive proximity Optical presence Mechanical contact 2 SULIT

2 SOALAN 3 Berikan fenomena tipikal fizikal yang dikesan oleh penderia logikal yang disenaraikan dibawah. Penghampir Induktif Penghampir Kapasitif Pengesan optik Sesentuh mekanikal QUESTION 4 Give FOUR (4) functions for PLC SOALAN 4 Berikan EMPAT (4) fungsi PLC QUESTION 5 List down FOUR(4) Programming Languages for PLC CLO2 C4 SOALAN 5 Senaraikan EMPAT ( 4 ) jenis pengaturcaraan bagi PLC QUESTION 6 With the aid of a ladder diagram and a mnemonic code, explain the difference for the instructions LD and LD NOT SOALAN 6 Dengan bantuan gambarajah tangga dan kod mnemonik, terangkan perbezaan bagi arahan LD dan LD NOT. 3 SULIT

3 CLO2 C4 QUESTION 7 Draw the ladder diagram for the operation below. When an input push button is being pressed 5 times, then the output will turn ON. When the output is turn ON, TIM 001 will activate and after 3 seconds the output will turn OFF. The input is used as the reset button. SOALAN 7 Lukis gambarajah tangga bagi operasi di bawah. Apabila suis tekan masukkan ditekan 5 kali, keluaran akan ON. Apabila keluaran ON, TIM 001 akan aktif dan selepas 3 saat keluaran akan OFF. Gunakan masukkan sebagai butang reset. CLO2 QUESTION 8 SET and RESET instructions will change the status of bit operations only when the implementation is ON. Draw a ladder diagram using the SET and RESET instructions by refering to figure 8a. SOALAN 8 Arahan SET dan RESET akan menukar status operasi bit hanya apabila pelaksanaan adalah ON. Lukiskan gambarajah tangga menggunakan arahan SET dan RESET dengan rujuk rajah 8a. Figure 8a/ Rajah 8a 4 SULIT

4 QUESTION 9 In order to minimize the damage of PLC installation several steps are taken to ensure proper wiring is made. List FOUR (4) steps as guidance to produce a proper wiring SOALAN 9 Dalam usaha mengurangkan kerosakan pemasangan PLC terdapat beberapa langkah diambil bagi memastikan pendawaian yang dibuat adalah betul. Senaraikan EMPAT (4) langkah sebagai panduan dalam menghasilkan pendawaian yang baik C4 QUESTION 10 Identify TWO( 2) main criteria that would cause PLC failure. SOALAN 10 Kenalpasti DUA(2) kriteria penting yang akan menyebabkan PLC gagal berfungsi. [4 markah ] 5 SULIT

5 SECTION B: 60 MARKS INSTRUCTION: This section consists of THREE (3) essay questions. Answer ALL questions. ARAHAN : Bahagian ini mengandungi TIGA (3) soalan esei. Jawab SEMUA soalan. QUESTION 1 SOALAN 1 a) Identify the types of the following relays: Kenalpasti jenis geganti berikut: i. NO NC COMM coil ii. NO NO COMM COMM iii. Coil NO COM NC NO COM NC Coil (b) Describe the functions of the following actuators: Terangkan fungsi penggerak-penggerak berikut: i. Solenoid Solenoid ii. Valve Injap [3 marks] [3 markah] 6 SULIT

6 CLO 2 (c) Based on Figure 1, sensor A will detect the cap which is made of plastic, while sensor B will detect the level of the perfume in the vials. Recognize the type of sensor that can be used for sensor A, sensor B and output device C. Berdasarkan Rajah 1, penderia akan mengesan penutup botol, A yang diperbuat daripada plastik, manakala penderia B akan mengesan paras minyak wangi dalam botol kecil. Kenalpasti jenis penderia yang boleh digunakan di tempat penderia A, penderia B dan peranti keluaran, C. A C C B Figure 1/ Rajah 1 [3 marks] [3 markah] C1 (d) In switch wiring, Sinking (NPN) and Sourcing (PNP) are terms that define the control of direct current flow in a load. With aid of diagram Dalam pendawaian suis, Salir (NPN) Keluaran dan Punca (PNP) Keluaran adalah syarat yang menentukan kawalan aliran arus terus dalam beban. Dengan bantuan gambarajah yang bersesuaian,. i) Draw Sinking (NPN) Output and Sourcing (PNP) Output circuit connection. Lukiskan litar sambungan bagi litar Salir (NPN) Keluaran dan Litar Punca (PNP) Keluaran. [6 marks] [6 markah] 7 SULIT

7 ii) Compare the control of direct current flow in a load in Sinking (NPN) Output and Sourcing (PNP) Output circuit connection. Bandingkan kawalan arus terus dalam beban bagi litar sambungan Salir (NPN) Keluaran dan Litar Punca (PNP) Keluaran. QUESTION 2 a) The first PLC was created in 1968 by a group of engineers in General Motor(GM) Company to replace a complicated relay control system. They also set that this control system specification must have certain criteria. State FIVE (5) of the criteria. PLC dicipta pada tahun 1968 oleh sekumpulan jurutera dari General Motor (GM) bagi mengantikan sistem kawalan geganti yang rumit. Mereka menetapkan bahawa spesifikasi system kawalan ini mesti mempunyai kriteria tertentu. Nyatakan LIMA (5) kriteria ini [5 marks] CLO2 b) Draw the connection for the component in the table below with the PLC in Figure 2a Lukiskan penyambungan PLC bagi peranti yang terdapat pada jadual dibawah Rajah 2a [5 marks] QUANTITY COMPONENT 1 nos motor 24 vdc 1 nos push button N/O 1 nos push button N/C 8 SULIT

8 MODUL KELUARAN MODUL MASUKAN Figure 2a/ Rajah 2a c) Draw the ladder diagram and write the mnemonic code of TIMER Lukiskan rajah tangga dan tulis kod mnemonic bagi PEMASA [5 marks] d) Convert the ladder diagram below to a mnemonic code. [5 marks] Tukarkan rajah tangga di bawah kepada kod mneumonik 9 SULIT

9 QUESTION 3 SOALAN 3 (a) Figure B3 below shows a quiz programme that is using First-in Priority Circuit concept. Read and understand the sequential operation and the system layout given. Then answer the following questions. Rajah B3 di bawah menunjukkan program kuiz menggunakan konsep kawalan jujukan yang mudah. Baca dan fahami jujukan operasi yang diberikan. Kemudian jawab soalan-soalan yang diberi. Figure B3 / Rajah B3 Control Purpose: There are 3 groups participating in the quiz program: primary school student, secondary school students, and professors. If they want to get the chance of answering the question from the host, they must press the answer button (X0, X1, X2, X3, and X4) on their table first. Other groups pressing will be invalid if other group gets the chance successfully. There are 2 answer button for the primary school students group and professor group, which are X0 and X1 and X3 and X4 respectively. The secondary school group has only 1 answer button which is X2. In order to give preferential treatment to primary school students group, Y0 lamp will be ON if one of X0 or X1 is pressed. However, in order to limit the professor group, Y2 lamp will be ON when X3 and X4 are pressed at the same time. For the secondary school student group, Y1 lamp will be ON when X2 is pressed. If the host presses reset button X5, Y0, Y1 and Y2 will be OFF. 10 SULIT

10 Konsep kawalan; Terdapat 3 kumpulan peserta dalam satu program kuiz. Iaitu pelajar sekolah rendah,pelajar sekolah menengah dan professor. Jika peserta ingin mendapatkan peluang untuk menjawab soalan daripada hos, mereka perlu menekan butang jawapan ( X0,X1,X2,X3 dan X4) di atas meja mereka. Kumpulan lain akan hilang peluang menjawab sekiranya ada kumpulan telah menekan butang paling awal. 2 butang jawapan disediakan X0 dan X1 untuk peserta sekolah rendah manakala X3 dan X4 untuk kumpulan professor. Peserta sekolah menengah hanya diberi peluang menekan butang jawapan X2 Untuk memberikan keutamaan kepoada peserta sekolah rendah, lampu Y0 akan berfungsi (ON) apabila X0 dan X1 ditekan. Untuk menghadkan kumpulan professor, lampu Y2 akan beroperasi (ON) apabila X3 dan X4 ditekan serentak. Bagi peserta sekolah menengah, lampu Y1 akan beroperasi (ON) apabila X2 ditekan. Jika hos menekan butan RESET X5,lampu Y0,Y1 dan Y2 akan OFF CLO2 (i) List and assign the operation bit for the input and output devices used. Senaraikan dan tentukan bit operasi bagi peranti-peranti masukan dan keluaran yang digunakan. [5 marks] (ii) Draw the ladder diagram of the system. Lukiskan gambarajah tangga sistem. [10 marks] [10 markah] (b) List FIVE (5) preventive maintenance works that should be done to the system that is using PLC. Senaraikan LIMA (5) kerja penyelenggaraan pencegahan yang perlu dilakukan dalam sistem menggunakan PLC. [5 marks] SOALAN TAMAT 11 SULIT