毕设外文翻译--单片机基础-单片机(编辑修改稿)

毕设外文翻译--单片机基础-单片机(编辑修改稿)内容摘要：

r o m a n e xte r na l s o ur c e . T hi s l a tte r a r r ange me nt i s us e ful i s e xt e r na l s ync hr o ni za ti o n o f the mi c r o c o mp ute r i s r e q ui r ed . WORDS AND TERMS culmination spilt volatile n. 易变的 mit albeit custom variant piggyback socket n. 插座 B:PLC[1] P LC s ( p r o gr amma b l e l o gi c a l c o ntr o l ler) fa c e e v e r mo r e c o mp l e x c hall e nges these da ys . Wher e o nc e the y q uie tl y re pla ce d rel a ys a nd ga ve a n o cc asio nal r ep or t to a co rp ora te ma i nfra me , the y are now gr o upe d i nto ce lls, gi v e n ne w j o b a nd ne w l a ngua ge s , a nd a r e fo r c e d to c o mp e te a ga i ns t a gr o w i ng a r r a y o f c o ntr o l p r o d uc ts. F o r thi s ye a r 39。 s a nnua l P LC te c hno l o gy up d a te , w e q ue r i e d P LC ma ke r s o n the s e to p i c s a nd mo r e . Programming languages H i ghe r l e v e l P LC p r o gr a mmi ng l a ngua ge s ha v e b e e n a r o und fo r s o me ti me , b ut l a te l y the i r p o p ul a rity h a s mus hr o o mi ng. A s R a ymo nd Le v e i l le, v i c e p r e s id ent amp。 ge ne r a l ma na ge r, S i e me ns E ne r gy amp。 A uto ma ti o n . i nc。 P r o gr a mma b l e c o ntr o ls a r e b e i ng us e d fo r mo r e a nd mo r e s o p hi s ti cate d o p e r a tions , l a ngua ge s o the r tha n l a d d e r l o gi c b e c o me mo r e p r a c tic al, e ffi c i ent, a nd p o w e rful . F o r e xa mp l e , i t39。 s v e r y d i ffi c ult to w r i te a tr i go no me tr i c func ti o n us i ng l a d d e r l o gi c . La ngua ge s ga i ni ng a c c e p ta nc e i nc l ud e B o o l e an, c o ntr o l s ys te m fl o w c har ting, a nd s uc h func ti o n c ha r t l a ngua ge s a s G r a p hc e t a nd i ts v a r i atio n . A nd the r e 39。 s i nc r e a sing i nte r e st i n l a ngua ge s l i ke C a nd B A S IC . PLCs in process control T hus fa r, P LC s ha v e no t b e e n us e d e xte ns i v e ly fo r c o nti nuo us p r o c e ss c o ntrol . Will this c o nti nue ? T he feeli ng tha t I39。 ve go tte n, sa ys K e n Ja nno tta , ma nge r, p r o d uc t p l a nni ng, s e r i es O ne a nd S e r i e s S i x p r o d uc t , a t G E F a nuc N o r th A me r i c a , 39。 i s tha t P LC s w i l l b e us e d i n the p r o c e ss i nd us tr y b ut no t ne c e s s a rily fo r p r o c e ss c o ntr o l. S e v e r al v e nd o r s o b v ious ly b e tti ng tha t the o p p o s ite w i l l ha p p e n ha v e i ntr o d uc e d P LC s o p ti mi ze d fo r p r o c e ss a p p l icatio n . R i c h Rya n, ma nge r, c o mme r c i a l ma r ke ti ng, A l l e n b rad ley P r o gr a mma b l e C o ntr o l s D i v. , c i te s P LC s 39。 s i nc r e a sing us e s uc h i nd us tr i es a s fo o d , c he mi c a l s , a nd p e tr o l eum. Rya n fe e l s the r e a r e tw o typ e s o f a p p l i ca tions i n w hi c h the y39。 r e a p p r o pri ate. o ne , he s a ys , i s w he r e the s i ze o f the p r o c e s s c o ntr o l s ys te m tha t39。 s b e i ng a uto ma te d d o e s n39。 t j us ti fy D C S [ d i s tribute d c o ntr o l s ys te m] . Wi th the s ta r ti ng p r i c e ta gs o f c ho s e p r o d uc ts b e i ng r e l a tiv ely hi gh, a p r o gr a mma b l e c o ntr o l le r ma ke s s e ns e fo r s ma l l , l o w l o o p c o unt a p p l i catio n . T he s e c o nd i s w he r e yo u ha v e to i nte gr a te the l o o p c l o s e ly w i th the s e q ue nti a l l o gi c a l . B a tc h c o ntr o l lers a r e p r i me e xa mp l e , w he r e the s e q ue nc e a nd ma i ntai ni ng the pr oc ess va ria ble are i nter tw i ned so cl osel y tha t the be ne fi ts o f ha v i ng a p r o gr a mma b l e c o ntr o l le r to d o the s e q ue nti a l l o gi c a l o utw e ighs s o me o f the d i s a d va nta ge s o f no t ha v i ng a d i s tr ibute d c o ntr o l s ys te m. B i l l B a r ko v itz, p r e s id ent o f Tr i c o ne x, p r e d icts tha t a l l futur e c o ntr o l le rs tha t c o me o ut i n the p r o c e ss c o ntr o l s ys te m b us i ne s s w i l l e mb ra ce a lo t o f mor e P LC tec hnol o gy a nd a lo t mo re P LC func ti o nali ty tha n the y e v e r d i d b e fo r e . Communications and MAP C o mmuni c a ti o ns a r e v i ta l to a n i nd i v i d ual a uto ma ti o n c e l l a nd to b e a uto ma te d fa c to r y a s a w ho l e . We 39。 v e he a r d a l o t a b o ut MA P i n the l a s t fe w ye a r s , a nd a l o t o f c o mp a ni e s ha v e j ump e d o n the b a nd w a go n. [2 ]Many, ho w e v e r, w e r e d i s a p po inte d w he n a ful l y d e fi ne d a nd c o mp l e te d MA P s p e c i fica tion d i d n39。 t a p p e a r i mme d i a te ly . S a ys La r r y K o ma r e k: R i ght no w , MA P i s s ti l l a mo v i ng ta r ge t fo r the ma nufa c tur e r s , a s p e c ifi cati on tha t i s no t fi na l . P r e s entl y, fo r e xa mp l e . p e o p l e a r e i ntr o d uc i ng p r o d uc ts to me e t the MA P 2 . 1 s ta nd a rd . Ye t2 . 1 b as ed p r o d uc ts w i ll b e o b s o l ete w he n the ne w s ta nd a r d fo r MA P 3 . 0 i s i ntr o d uc e d . B e c a us e o f thi s , ma ny P LC v e nd o r s a r e ho l d i ng o ff o n ful l MA P i mp l e me nta ti o ns . O mr o n, fo r e xa mp l e , ha s a n o ngo i ng MA P c o mp a ti bility p r o gr a m。 [ 3 ]b ut F r a nk N e w b ur n, v i c e p r e s id ent o f O mr o n39。 s Ind us tr i a l D iv isio n ,re po r ts tha t bec a us e o f the la c k o f a fir m d e fi ni tio n , O mro n39。 s P LCs d o n39。 t ye t ta l k to MA P.。