微(Wei)生(Sheng)物(Wu)限(Xian)度(Du)检(Jian)测(Ce)仪(Yi)PLC控(Kong)制(Zhi)系(Xi)统(Tong)
PLC内(Nei)部(Bu)工(Gong)作(Zuo)方(Fang)式(Shi)一(Yi)般(Ban)是(Shi)采(Cai)用(Yong)循(Xun)环(Huan)扫(Sao)描(Miao)工(Gong)作(Zuo)方(Fang)式(Shi)，(?)在(Zai)一(Yi)些(Xie)大(Da)、(?)中(Zhong)型(Xing)的(De)PLC中(Zhong)增(Zeng)加(Jia)了(Liao)中(Zhong)断(Duan)工(Gong)作(Zuo)方(Fang)式(Shi)。(?)当(Dang)用(Yong)户(Hu)将(Jiang)用(Yong)户(Hu)程(Cheng)序(Xu)调(Diao)试(Shi)完(Wan)成(Cheng)后(Hou)，(?)通(Tong)过(Guo)编(Bian)程(Cheng)器(Qi)将(Jiang)其(Qi)程(Cheng)序(Xu)写(Xie)入(Ru)PLC存(Cun)储(Chu)器(Qi)中(Zhong)，(?)同(Tong)时(Shi)将(Jiang)现(Xian)场(Chang)的(De)输(Shu)入(Ru)信(Xin)号(Hao)和(He)被(Bei)控(Kong)制(Zhi)的(De)执(Zhi)行(Xing)元(Yuan)件(Jian)相(Xiang)应(Ying)的(De)连(Lian)接(Jie)在(Zai)输(Shu)入(Ru)模(Mo)块(Kuai)的(De)输(Shu)入(Ru)端(Duan)和(He)输(Shu)出(Chu)模(Mo)块(Kuai)的(De)输(Shu)出(Chu)端(Duan)，(?)接(Jie)着(Zhuo)将(Jiang)PLC工(Gong)作(Zuo)方(Fang)式(Shi)选(Xuan)择(Ze)为(Wei)运(Yun)行(Xing)工(Gong)作(Zuo)方(Fang)式(Shi)，(?)后(Hou)面(Mian)的(De)工(Gong)作(Zuo)就(Jiu)由(You)PLC根(Gen)据(Ju)用(Yong)户(Hu)程(Cheng)序(Xu)去(Qu)完(Wan)成(Cheng)，(?)右(You)图(Tu)是(Shi)PLC执(Zhi)行(Xing)过(Guo)程(Cheng)框(Kuang)图(Tu)。(?)PLC在(Zai)工(Gong)作(Zuo)过(Guo)程(Cheng)中(Zhong)，(?)主(Zhu)要(Yao)完(Wan)成(Cheng)六(Liu)个(Ge)模(Mo)块(Kuai)的(De)处(Chu)理(Li)。(?)
PLC 硬(Ying)件(Jian)构(Gou)成(Cheng)编(Bian)辑(Ji)
电(Dian)源(Yuan)组(Zu)件(Jian)
电(Dian)源(Yuan)组(Zu)件(Jian)用(Yong)于(Yu)提(Ti)供(Gong)PLC运(Yun)行(Xing)所(Suo)需(Xu)的(De)电(Dian)源(Yuan)，(?)可(Ke)将(Jiang)外(Wai)币(Bi)电(Dian)源(Yuan)转(Zhuan)换(Huan)为(Wei)供(Gong)PLC内(Nei)部(Bu)与(Yu)案(An)件(Jian)适(Shi)用(Yong)的(De)电(Dian)源(Yuan)。(?)
2.微(Wei)处(Chu)理(Li)器(Qi)CPU及(Ji)存(Cun)储(Chu)器(Qi)组(Zu)件(Jian)
微(Wei)处(Chu)理(Li)器(Qi)CPU是(Shi)PLC的(De)核(He)心(Xin)器(Qi)件(Jian)，(?)CPU因(Yin)生(Sheng)产(Chan)厂(Chang)商(Shang)各(Ge)有(You)不(Bu)同(Tong)，(?)有(You)采(Cai)用(Yong)市(Shi)场(Chang)销(Xiao)售(Shou)的(De)标(Biao)准(Zhun)芯(Xin)片(Pian)，(?)也(Ye)有(You)采(Cai)用(Yong)可(Ke)编(Bian)程(Cheng)序(Xu)控(Kong)制(Zhi)器(Qi)专(Zhuan)用(Yong)芯(Xin)片(Pian)。(?)
存(Cun)储(Chu)器(Qi)组(Zu)件(Jian)有(You)两(Liang)种(Zhong)：(?)ROM和(He)RAM。(?)
3.输(Shu)入(Ru)及(Ji)输(Shu)出(Chu)组(Zu)件(Jian)
输(Shu)入(Ru)和(He)输(Shu)出(Chu)组(Zu)件(Jian)是(Shi)PLC与(Yu)工(Gong)业(Ye)生(Sheng)产(Chan)现(Xian)场(Chang)交(Jiao)换(Huan)数(Shu)据(Ju)的(De)界(Jie)面(Mian)，(?)与(Yu)普(Pu)通(Tong)计(Ji)算(Suan)机(Ji)不(Bu)同(Tong)，(?)PLC的(De)工(Gong)作(Zuo)环(Huan)境(Jing)比(Bi)较(Jiao)差(Cha)，(?)需(Xu)要(Yao)较(Jiao)强(Qiang)抗(Kang)干(Gan)扰(Rao)能(Neng)力(Li)，(?)输(Shu)入(Ru)和(He)输(Shu)出(Chu)组(Zu)件(Jian)既(Ji)是(Shi)为(Wei)此(Ci)设(She)计(Ji)。(?)