REKABENTUK MEKATRONIK I

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UNIVERSITI SAINS MALAYSIA Peperiksaan Semester Kedua Sidang Akademik 200812009 April - Mei 2009 EEM 253 - REKABENTUK MEKATRONIK I Masa: 2 jam Sila pastikan bahawa kertas peperiksaan ini mengandungi LAPAN muka surat yang bercetak sebelum anda memulakan peperiksaan ini. Kertas soalan ini mengandungi dua bahagian iaitu Bahagian A dan Bahagian B dan LIMA soalan. Jawab EMPAT soalan. Jawab TIGA soalan dalam Bahagian A dan SEMUA soalan dalam Bahagian B Mulakan iawapan anda untuk setiap soalan pada muka surat yang baru. Agihan markah bagi setiap soalan diberikan di sudut sebelah kanan soalan berkenaan. Jawab semua soalan dalam bahasa Malaysia atau bahasa Inggeris atau kombinasi kedua-duanya....2t-

IEEM 2531 BAHAGIAN A - JAWAB 3 SOALAN SAHAJA PART A - ANSWER 3 QUESTION ONLY 1. (a) Berikan lima kebaikan PLC berbanding dengan menggunakan logik relay. List five advantages that PLCs offer over a reray logic sotution. (b) satu sistem konveyor adalah seperti yang dipaparkan dalam Rajah 1(b) menyusun kotak-kotak supaya setiap saluran = menerima 10 kotak. Operasi sistem tersebut adalah seperti berikut: Gate 1 selalu diturunkan supaya kotak disalurkan ke saluran 1 pada masa mulanya. selepas 10 kotak disalurkan kepada saluran 1, gate 2 diturunkan supaya 10 kotak akan pergi ke saluran 2. Proses tersebut akan berulang semula untuk menghantar kotak-kotak ke saluran 1 semula. satu suis mula digunakan untuk memulakan proses dan satu suis ditutup bagi menghentikan proses pada bila-bila masa. A conveyor system, illustrated in Figure 1(b) sorts boxes so that each chute receives 10 boxes. The operation is as follows: Gate 1 is always drop so that the boxes witl go to chute 1 initiatty. After 10 boxes has gone to chute 1, gate 2 is dropped, then 10 boxes witt go to chute 2. The process will be repeated again fo send the boxesto chute 1 again. A start switch is used to start the process and a stop switch is used to stop the process anytime. -2-...3t-

-3- IEEM 253I Penderia jenis ' Through -beam" Through-beam sensor -v? IL Gate I Rajah 1(b) Figure 1(b) (15 marks) (a) Namakan jenis-jenis penderia photoelektrik dan terangkan perbezaan mereka. Name all different types of photoelectric sensors and state the difference. (5 ryarks) (b) Lukiskan satu gambarajah tangga bagi sistem pengepam yang memerlukan 5 saat masa lengah sebelum memulakan pengepaman. Apabila pam tersebut ditutup, ia memerlukan 15 saat masa lengah sebelum ia boleh dimulakan semula. Apabila satu suis dihentikan, pam tersebut terus beroperasi selama 30 saat selepas suis berhenti ditekan. Draw a ladder diagram for a pumping system where the pump requires a 5-second delay before pumping When the pump is shuf off, it requires a 1S-seconds delay before it can be restarted. When the stop switch is pressed the pump continues to run for 30 seconds after the sfop push button is pressed. (15 marks)...4t-

-4- IEEM 2531 (a) Namakan semua komponen yang terdapat dalam sistem pengawal logik pembolehubah dan terangkan fungsi setiap komponen tersebut. Name all the major component parts of a Pogrammable Logic Controller sysfem and describe the functions of each components. (10 marks) (b) Pilih modul masukan dan keluaran yang sesuai dan bilangan modul yang dipilih bagi sistem PLC dari katalog yang ditunjukkan dalam Jadual 1 sekiranya peranti-peranti lapangan berikut diperlukan: Se/ecf the appropriate input and output module and number of the selected modules for a plc system from a catalog shown in Table 1 if the following field devices are needed: (i) Duabelas masukan 240VAC, duapuluh empat SVDC suis jenis SPST, dan sepuluh masukan 24YDC daripada penderia jenis sumber. Twelve 240 VAC inputs, twenty four SVDC inputs for SPSf switches, and ten 24VDC inputs from sourcing type sensors. (ii) Limabelas injap pneumatik yang memerlukan 28VDC, sepuluh 24VDC isyarat kawalan untuk satu CNC mesin dengan masukan sumber, dan tiga motor 240VC yang mempunyai arus pusuan mula yang kurang daripada 10A. 15 pneumatic valves that requires 28VDC, ten 24VDC control signals for a CNC machine with sourcing inputs and three 240VAC motors with starting surge currents less than 10 amps. (10 marks)...51-

IEEM 253I Voltage Category Jadual 1 lnput dan Output Modul Table 1 lnput and Output module Category Number InpuUOutput t/o points Module Description 200t240v Ac 1746-rM8 Input I 240VAC 200t240v AC 1746 tm16 Input 16 240 VAC 120t240V4C 1746-OAP Output 12 High current 240VAC Output 120t240V4C 1764-c416 Output 12 120t240V AC output (<4amp) 5VDC/TTL 1771-tGD lnput I TTL SVDC/TTL 1771-tG Input 16 TTL 24VDC 1771-tBD lnput 16 Current sinking DC input 24VDC 1746-1Q16 lnput 16 Current sourcing DC input 24VDC 1746-OV 32 Output 16 Curent Sinking DC Output 24V DC 1746-Q816 Output 16 Current Sourcing DC Outout AC/DC relav 1746-OX16 Output 16 Relav output 4. (a) Terangkan fungsi penapis, pengatur dan pelicin dalam satu sistem elektropneumatik. Describe the functions of the filter, regulator and lubricator in an e I e ct rop n e u m at i c sysfem. (b) Lukiskan simbol untuk injap olak-alik dan injap ekzos cepat. Draw the symbol of the shuttle valve and rapid exhaust valve. -5-...61-

-6 IEEM 2531 (c) Lukiskan gambarajah masa Allen Bradley pada pemasa bersimpan-nyah lengah dalam talian yang mempunyai parameter-parameter berikut: bit boleh pemasa, bit pemasa pemasaan dan bit pemasa habis. Keadaan awal diberikan seperti berikut: Draw the timing diagram of Alten-Bradley on on-delay non-retentive timer which has the foltowing parameters: Timer-enable bit, Timer-timing bit, Timer-done bit. The input condition are given as follows: On off Allen -Bradley On-delay Timer Done Bit Enable Bit Timing Bit (d) Terangkan dengan gambarajah yang sesuai bagaimana halaju silinder pneumatik boleh dikawaldalam dua arah. Explain with appropriate diagram how the speed of pneumatic cylinder in both forward and backward direction can be controlled'.7 t-

-7 - [EEM 2531 BAHAGIA'V 8 - JAWAB SEMUA SOALAN PART B - ANSWER ALL QUESTION 5. Silinder 14 menolak produk keluar daripada magazin suap graviti seperti dipaparkan di dalam Rajah 2 dan mengapitkan produk. Selepas ini, silinder 24 bergerak ke hadapan untuk mengecapkan produk dan bergerak balik. Selepas ini, silinder 1A bergerak balik. Silinder 3,A akan menolak produk keluar dan bergerak balik. Cylinder 14 is to push parls out of the gravity feed magazine as shown in Figure 2 and clamp Only then can cylinder 24 stamp the part and retract lhem. once again. Next, clamping cylinder 1A is to unclamp. The pariis to be ejected by cylinder 3A, which then returns to the retracted end position. (a) Lukiskan gambarajah langkah-masa. Draw the step-displ acement diagram. (b) Lukiskan kesemua litar pneumatik. Draw all pneumatic circuit. (c) Lukiskan litar elektrik. Draw the electrical circuit (d) Selesaikan masalah tersebut dengan menggunakan "SFC". So/ve the problem with SFC. (e) Selesaikan masalah tersebut dengan menggunakan gambarajah logik tangga. Solve the problem with the Ladder logic diagram. (40 marks)...81-

-8- IEEM 2531 Rajah 2 Figure 2 ooooooooo