dangqianzutairuanjianzaigongyekongzhizhongdedaoleriyiguangfandeyingyong。zutairuanjianyijuzishendeguochengshujuku，xialiangezhongyingjianshebei
，bingtongguodongtairenjijiemiankeyijiangcaijichulideshujuzhanxiangeiyonghu，huozhechuandigeiqitayingyongchengxu。qijiegourutusuoshi：

   組zu態tai軟ruan件jian的de出chu現xian
，由you於yu其qi預yu先xian提ti供gong了le各ge種zhong常chang用yong組zu件jian和he相xiang關guan設she備bei驅qu動dong，一yi方fang麵mian將jiang監jian控kong係xi統tong設she計ji的de難nan度du大da為wei降jiang低di

，開kai發fa相xiang關guan係xi統tong的de時shi間jian也ye大da為wei縮suo短duan，另ling一yi方fang麵mian
，由you於yu可ke以yi自zi由you連lian接jie多duo種zhong設she備bei，提ti供gong了le一yi個ge平ping台tai，用yong戶hu可ke以yi依yi據ju需xu要yao設she計ji出chu成cheng本ben最zui優you的de工gong程cheng。

   對於硬件設備，特別是可編程的PLC等硬件，自身具有一定的控製功能
，而可以連接PLC等硬件的組態軟件也可以通過腳本等執行一定的控製功能，那麼控製是交給上位機的組態軟件
，還是下位機的PLC呢？這裏先對兩者做一個簡單的比較：

   下位機控製

   下xia位wei機ji可ke以yi執zhi行xing一yi些xie相xiang關guan的de控kong製zhi動dong作zuo，優you點dian在zai於yu其qi速su度du快kuai
，可ke靠kao性xing高gao
，穩wen定ding。其qi缺que點dian在zai於yu受shou到dao其qi自zi身shen的de限xian製zhi，對dui於yu一yi些xie特te殊shu的de複fu雜za控kong製zhi，以yi及ji和he其qi他ta特te殊shu設she備bei相xiang關guan或huo者zhe涉she及ji到dao關guan係xi數shu據ju庫ku等deng控kong製zhi功gong能neng作zuo無wu法fa執zhi行xing。

   上位機控製

    上shang位wei機ji的de組zu態tai軟ruan件jian同tong樣yang可ke以yi執zhi行xing一yi定ding的de控kong製zhi動dong作zuo，其qi優you點dian在zai於yu腳jiao本ben編bian寫xie更geng容rong易yi，而er且qie可ke以yi方fang便bian可ke執zhi行xing涉she及ji到dao多duo個ge設she備bei以yi及ji關guan係xi數shu據ju庫ku或huo者zhe其qi他ta數shu據ju的de控kong製zhi動dong作zuo，能neng充chong分fen發fa揮hui自zi身shen係xi統tong的de優you勢shi。缺que點dian在zai於yu有you時shi會hui遇yu到dao上shang位wei機ji和he下xia位wei機ji通tong訊xun的de時shi間jian瓶ping頸jing
，而er且qie通tong常chang組zu態tai軟ruan件jian運yun行xing工gong控kong機ji在zai其qi他ta操cao作zuo係xi統tong上shang，其qi穩wen定ding性xing和hePLC等有差距。

   在實際工程中
，應該根據需要來進行相關的控製分布。下麵通過一些典型示例進行說明：

   適合下位機控製場合

    duiyuyixieshishixingyaoqiujiaogao，huozheshangweijihexiaweijitongxunjiaomanhuorongyishoudaoganraodeqingkuangxia，jianyibaguanjiandekongzhifangzaixiaweijizhixing。biruduiyuyixiedianxingdeshuilixiangmu，birushuizhijiance
，qiyunxingjiancexitongdezizhanheyunxingzutairuanjiandezhongxinzhankenengxiangjujiaoyuan，qitongxunkenengcaiyongshuchuandiantai，bohao，GSM
，GPRS等deng方fang式shi。在zai這zhe種zhong情qing況kuang下xia，由you於yu其qi通tong訊xun距ju離li遠yuan

，可ke能neng會hui有you些xie延yan遲chi，所suo以yi控kong製zhi功gong能neng更geng多duo的de放fang在zai了le下xia位wei機ji
，而er上shang位wei機ji主zhu要yao負fu責ze數shu據ju的de采cai集ji，存cun儲chu和he顯xian示shi，也ye可ke包bao含han一yi些xie對dui下xia位wei機ji的de設she置zhi功gong能neng。

   適合上位機控製的場合

    duiyuyixieheguanxishujukuhuozheduozhongshebeixiangguandekongzhigongneng，danchundeyikaoxiaweijijinxingkongzhi，kenengfeichangmafanhuozhenanyishixian，zhezhongqingkuangxiajianyiyoushangweijijinxingkongzhi。biruchezhandedengguangkongzhi
，xuyaohuoquhuochedexingchexinhaoyijiqitashujulaijinxingpanduanshifouliangdeng，erxingchexinhaoyibancunzaishujukuhuozhexuyaocongyindaoxitongzhonghuoqu，zhezhongqingkuangxia，ruguoqikongzhijihuquanbuyoushangweijishixian。

   在zai更geng多duo的de時shi候hou，是shi根gen據ju控kong製zhi功gong能neng自zi身shen的de特te點dian來lai進jin行xing相xiang關guan設she置zhi。下xia位wei機ji和he上shang位wei機ji可ke以yi根gen據ju需xu要yao各ge執zhi行xing相xiang關guan部bu分fen控kong製zhi功gong能neng，實shi時shi性xing要yao求qiu較jiao高gao的de控kong製zhi可ke以yi放fang到dao下xia位wei機ji，複fu雜za的de
，關guan聯lian其qi他ta數shu據ju的de控kong製zhi可ke以yi放fang在zai上shang位wei機ji
，兩liang者zhe在zai一yi起qi構gou成cheng一yi個ge完wan備bei的de控kong製zhi係xi統tong。合he理li的de進jin行xing分fen配pei，不bu僅jin可ke以yi減jian少shao勞lao動dong量liang，而er且qie可ke以yi提ti高gao工gong程cheng的de健jian壯zhuang性xing。