可编程控制器在化工过程控制中的应用-工程技术版.PDF

5 3 () V o.l 5 N o. 3 2005 9 JOURNAL OF NAN JING NORM AL UN IVER SITY ( ENG IN EER ING AND TE CHNOLOGY ) Sep, 2005 可编程控制器在化工过程控制中的应用 史国生, 刘 怀 ( , 2 10042) [] , , . I/O PLC . , , . , : . [] , , , [ ] T P27 3, [] B, [] 1672-1292( 2005) 03-0028-04 Application of Control System to R eaction System in Chem ical Industry Based on PLC SH IG uosheng, L IU Hua i ( S chool o E lectrical and A u tom ation Eng ineering, N anjing N orm al U n iversity, J iangsu N anjing 2 10042, C hina) Abstract: On the basis o analyzing the requirem en t o pro cess control sy stem in chem ica l indu stry, the paper illu s- trates the pr inciple or realizing the pro cess con tro l system w ith adopting P rogramm ab le L og ic Contro ller ( PLC ) , g ives the low chart, and introduces the signa l componen ts and dr iver o e lectrical equipm ents and the addresses o I/ O connectors. It a lso illu strates how to se lect PLC and to w ire electr ica l equ ipm ents, g ives the m ethod and concept or design ing state ladder graph ics o PLC w ith log ica l design m ethod, presents the log ica l expression equations o r every contro l step, and prog ram s ladder graphics or realiz ing process contro l. A s continuou s con tro l and sequence contro l are u sed w ide ly in pro cess control sy stem s, the m ethod or control sy stem in this paper can be applied w ide ly. K ey word s: process contro,l program log ic contro ller, contro l low chart, ladder graphics , ( PLC ) , . . PLC, 1 化工过程控制的原理 , PLC ,