A-LEVEL Electronics. ELEC4 Programmable Control Systems Mark scheme June Version: 1.0 Final
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1 A-LEVEL Elecronics ELEC4 Programmable Conrol Sysems scheme 243 June 26 Version:. Final
2 schemes are prepared by he Lead Assessmen Wrier and considered, ogeher wih he relevan quesions, by a panel of subjec eachers. This mark scheme includes any amendmens made a he sandardisaion evens which all associaes paricipae in and is he scheme which was used by hem in his examinaion. The sandardisaion process ensures ha he mark scheme covers he sudens responses o quesions and ha every associae undersands and applies i in he same correc way. As preparaion for sandardisaion each associae analyses a number of sudens scrips. Alernaive answers no already covered by he mark scheme are discussed and legislaed for. If, afer he sandardisaion process, associaes encouner unusual answers which have no been raised hey are required o refer hese o he Lead Assessmen Wrier. I mus be sressed ha a mark scheme is a working documen, in many cases furher developed and expanded on he basis of sudens reacions o a paricular paper. Assumpions abou fuure mark schemes on he basis of one year s documen should be avoided; whils he guiding principles of assessmen remain consan, deails will change, depending on he conen of a paricular examinaion paper. Furher copies of his mark scheme are available from aqa.org.uk Copyrigh 26 AQA and is licensors. All righs reserved. AQA reains he copyrigh on all is publicaions. However, regisered schools/colleges for AQA are permied o copy maerial from his bookle for heir own inernal use, wih he following imporan excepion: AQA canno give permission o schools/colleges o phoocopy any maerial ha is acknowledged o a hird pary even for inernal use wihin he cenre.
3 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 Level of response marking insrucions Level of response mark schemes are broken down ino levels, each of which has a descripor. The descripor for he level shows he average performance for he level. There are marks in each level. Before you apply he mark scheme o a suden s answer read hrough he answer and annoae i (as insruced) o show he qualiies ha are being looked for. You can hen apply he mark scheme. Sep Deermine a level Sar a he lowes level of he mark scheme and use i as a ladder o see wheher he answer mees he descripor for ha level. The descripor for he level indicaes he differen qualiies ha migh be seen in he suden s answer for ha level. If i mees he lowes level hen go o he nex one and decide if i mees his level, and so on, unil you have a mach beween he level descripor and he answer. Wih pracice and familiariy you will find ha for beer answers you will be able o quickly skip hrough he lower levels of he mark scheme. When assigning a level you should look a he overall qualiy of he answer and no look o pick holes in small and specific pars of he answer where he suden has no performed quie as well as he res. If he answer covers differen aspecs of differen levels of he mark scheme you should use a bes fi approach for defining he level and hen use he variabiliy of he response o help decide he mark wihin he level, ie if he response is predominanly level 3 wih a small amoun of level 4 maerial i would be placed in level 3 bu be awarded a mark near he op of he level because of he level 4 conen. Sep 2 Deermine a mark Once you have assigned a level you need o decide on he mark. The descripors on how o allocae marks can help wih his. The exemplar maerials used during sandardisaion will help. There will be an answer in he sandardising maerials which will correspond wih each level of he mark scheme. This answer will have been awarded a mark by he Lead Examiner. You can compare he suden s answer wih he example o deermine if i is he same sandard, beer or worse han he example. You can hen use his o allocae a mark for he answer based on he Lead Examiner s mark on he example. You may well need o read back hrough he answer as you apply he mark scheme o clarify poins and assure yourself ha he level and he mark are appropriae. Indicaive conen in he mark scheme is provided as a guide for examiners. I is no inended o be exhausive and you mus credi oher valid poins. Sudens do no have o cover all of he poins menioned in he Indicaive conen o reach he highes level of he mark scheme. An answer which conains nohing of relevance o he quesion mus be awarded no marks. 3 of 5
4 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 Quesion Par Commens/ Descripion Name This keeps all subsysems wihin a microconroller sysem synchronised. clock All arihmeic and logic operaions are carried ou in his subsysem. ALU A bidirecional bus wihin a microprocessor. daa bus A emporary sore for daa afer being sen o an oupu por. daa lach Inerfaces an analogue inpu signal o a microprocessor. ADC Isolaes an inpu por from a microprocessor when i is no being read. Tri-sae buffer A process which moniors he sae of an inpu por. 4 of 5
5 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 polling An area of memory used by a microprocessor as emporary sorage for is inernal processes. sack A process by which an exernal sysem can reques assisance from a microconroller. inerrup The locaion of he conrol program in a microconroller. ROM Quesion Par Commens/ 2 (a) (i) 2 (a) (ii) Digial inpus only respond o wo signal levels, while an analogue sensor provides many differen levels. Schmi provides wo disinc swiching levels, while comparaor only one, Schmi sops he sysem 'huning' 2 2 (b) (i) E.g. Limis he oupu volage o he microconroller, o and 5.V 2 5 of 5
6 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 2 (b) (ii) k and 7.5k in parallel=4.29k, use of volage divider formula, calculaion yielding he answer 3 2 (b) (iii) Use of volage divider formula, calculaion yielding he answer of 3.6V 2 6 of 5
7 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 Quesion Par Commens/ 3 (a) Inclusion of he bye xf, MOVW xf, MOVWR TRISB 3 7 of 5
8 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 3 (b) 2 moor up moor down Quesion Par Commens/ 3 (c) (i) x4 8 of 5
9 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 3 (c) (ii) x8 3 (d) e.g. label:, MOVRW PORTB, AND x2, JPZ label 3 9 of 5
10 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 Quesion Par Commens/ 4 (a) 8kΩ 4 (b) Use of l =.7R 2 C, subsiuion and calculaion o give answer 2 4 (c) - o oupu and + o +2V 4 (d) (i) Ses he value in he memory locaion xa o 4 (d) (ii) Polls PORTA unil here is a pulse 4 (d) (iii) Incremens xa and checks ha here is sill a pulse, repeas his unil he pulse ends and hen reurns 2 4 (e) Only he secion from label3 o label4 conribue o he iming =>7µs, so 28/7 = 4 2 ± of 5
11 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 Quesion Par Commens/ 5 (a) To suppress he large induced volages creaed by he moors as he coils are swiched off 5 (b) Volage across R = = 5.8V, so R = 5.8/.3 = 93Ω, so R = 2-27Ω 2 5 (c) 24.6kΩ, appropriae calculaion - eiher volage divider or raio 2 5 (d) ±5 lux 5 (e) Illuminaion of lef LDR becomes less so righ moor slows, illuminaion of righ LDR increases so lef hand moor speeds up, so robo moves o he righ 2 5 (f) The armaure of convenional moors roae coninuously when curren is applied, whereas he armaure of a sepper moor jus roaes hrough a se angle when curren is applied 2 of 5
12 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 Quesion Par Commens/ 6 (a) (i) Very large differenial volage gain 6 (a) (ii).5v 6 (b) D o Q', Q' o following CK, all reses conneced o V, firs clock labelled as inpu 4 6 (c) A.B'.C 6 (d) E.g. horizonal line across he display, line a he 4h row because 2.V ses he 4h comparaor, coninuous line seen because columns flash faser han he persisence of vision 3 2 of 5
13 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 Quesion Par Commens/ 7 (a) Only one bi changes a a ime, so sensor alignmen is no so criical as wih binary encoders Eiher for each correc circle or minus for each error D 7 (b) 3 7 (c) To include, LED shining ouwards, phoo-receiver poining ouwards in same direcion as LED 2 7 (d) (i) Correc formula, subsiuion, V 3 3 of 5
14 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 7 (d) (ii) E.g. o inver he oupu from op-amp X Quesion Par Commens/ 8 (a) (i) Boh he same, p-channel symbol 2 8 (a) (ii) Prevens he large induced volage when he moor swiches off from damaging he MOSFETs 8 (b) Firs wo, moor heavily damped, hird case, moor can roae freely 2 8 (c) X Y P Q A B Moor sae NC NC OFF 5 one for each column 4 of 5
15 MARK SCHEME A-LEVEL ELECTRONICS ELEC4 JUNE 26 NC NC OFF clockwise aniclockwise 5 of 5
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