北京机场饮食服务公司采购管理制度手册

北京机场饮食服务公司采购管理制度手册内容摘要：

it ing cont ent contr ol is a l about . Now in sever al ways in t he cont ext of industr ial aut om at ion can of t en be seen in t hr ee ways: ( 1) Pr ogr amm able Logical Cont r oler ( r efer red t o as I PC)。 ( 2) Dist r ibut ed Cont r ol System ( DCS f or shor t) , and ( 3) t he Pr ogr amm able Logical Cont r oler ( PLC f or shor t) . 2. PLC and t he I PC and DCS cont r ast cont r ast 1, each of t he t hr ee t echnol gies of or igins and developm ent r equir em ent s f or f ast dat a pr ocessing m akes it invent ed t he puter. The m en br ought in t er m s of har dwar e t her e, using a high level of st andar dizat ion, can use m ore patibil it y t ools, is a r ich sof t ware r esour ces, especially t he need f or im m ediacy in oper at ional syst em s. So t he put er can ef f ect ively cont rol is used t o cont r ol and m eet it s speed, on t he vir t ual m odel, r eal t im e and in put ational r equir em ent s. Dist ribut ed syst em st art ed wit h a cont r ol syst em f or indust rial aut om atic inst r um ent used t o cont rol, wher eas now it is successf uly developed int o indust r ial cont r ol c om put er used as a cent r al colect ion and dist r ibut ion syst em and t r ansit ion of dist r ibut ed cont rol syst em in analogue handling, loop cont rol, has begun t o r ef lect he use of a huge advant age. Though dist r ibuted system has gr eat advantages in loop r egulat ion, but only as a m eans of continuous pr ocess contr ol. Opt im izat ion of PLC is t he cor r esponding r elay needs was bor n, it s m ain use in t he wor k or der cont rol, ear ly pr im ar y is r eplaced r elay t his hulking syst em, f ocused on t he swit ch contr oling t he r unning or der of f unct ions. M arked by t he micr oprocessor in t he ear ly 1970 of t he 20t h cent ury em erged, m icro electr onics t echnology has developed r apidly, people soon m icr oelect ronics pr ocessing t echnology wil be used in t he Pr ogr am mable Logical Cont r oler ( t hat is 修 改 记 录 页数 修改后版本 修改日期 修改说明 备注 M anipulat or is now used as a indust r ial r obot s in use, t he cont r ol bj ect ives of t en appear oft en in indust r ial aut omation. I ndust rial aut om ation t echnology has gr adualy m at ur ed, as mat ure a t echnol gy line has been r apid developm ent in indust r ial aut om ation as a separ at e subject. Manipulat or applicat ion began t o f ilt er int o welding, logist ics, mechanical pr ocessing, and ot her indust ries. Especially at high or ver y low t em per at ures, f ul of poisonous gases, high r adiat ion case, robot in sim ilar cir cumst ances showed gr eat use also br ings gr eat convenience t o t he st aff . Pr ecisely because of t his r obot t o get people39。 s at tent ion began to be a high degr ee of development . Labor at es, wor king condit ions, labor int ensive aspect s of pr om ot ing development . Bot h at home and abr oad t o develop t he PLC ( pr ogr amm able logic cont r oler ) is in var ious special cir cumst ances and under special condit ions set f or m echanical devices. Now t ur ned on t he development of t he m icr oelect ronics aut omatic cont rol t echnology and t he r apid developm ent of t he t r ains, t he success of PLC har dware sof twar e and simulat ion cont rol win big and successf ul developm ent , now cont inues t o develop as a f act or y aut om ation st andar ds. Because r obots ar e good developm ent of t he t echnol gy m akes a good opt im ization of pr oduct ive capit al, and r obot shows t his unique advantages, such as: has good pat ibilt y, wide availabilt y, har dwar e is plet e, and pr ogramm ing t hat can be m ast er ed in a shor t t ime, so in t he context of indust r ial PLC applicat ions becam e ubiquit ous. M anipulat or in m any developed count ry agr icult ur e and indust ry has been applied, such as t he use of m echanical har vest ing lar ge areas of far mland, r epeat ed oper ations on t he high speed line t hat uses a r obot ic ar m, and so on. Today, t he high level of aut omat ion bined wit h r est rict ions on t he manipulat or developm ent level is slight ly lower t han t he int er nat ional. The design is mainly ar m welding machine by PLC Aut omat ion contr ol. This of design let designer s on in school by lear n of has a m ust of consolidat ion, under stand has some usualy didn39。 t oppor t unit ies awar eness in wor ld r ange wit hin som e leading level of knowledge has has m ust awar eness, hope designer s can in yihou of design in t he can success of using in t his design in t he pr oceeds of exper ience 1. 2 m anipulat or in bot h at home and abr oad of r esear ch pr of ile aut omat ion m echanical ar m r esear ch began Yu 20t h cent ury m edium ter m, aft er year s wit h wit h put er and aut omat ion t echnology of developm ent, M akes mechanical ar m on t he Gr and st age of indust r ial aut omation and shine, gr adually becam e an indust rial evaluat ion st andar ds, and it s im por tance can be seen. Now or iginal r obot ic ar m spent m ost of m ass pr oduction and use on t he pr oduction line, which is pr ogr am med r obotic ar m. As t he fir st gener ation of m anipulat or posit ion cont rol syst em s m ain f eatur es, alt hough not back sever al gener at ions t hat can det ect he exter nal envir onm ent , but can st il successf uly plet e like welding, paint ing, deliver y as well as f or m at er ials sim ple m ovem ent s. Second gener at ion m echanical ar m s ar e equipped wit h sensor s and m anipulat or s have t he envir onm ent t her e is a cer t ain am ount of sense, when t he m echanical ar m is t o use t he pr ogr am as a basis. Dif f er ence is t hat t he r obot begand m anipulat or cont rol m ode and pr ogr amm able co。