西門子PLC一級總代理：相(xiang)比(bi)較(jiao)西(xi)(xi)門(men)子(zi)PLC S7-200，西(xi)(xi)門(men)子(zi)PLC S7-300針對的是(shi)中小，他的模塊可以(yi)擴展多(duo)達(da)32個模塊，背板總線也在(zai)模塊內集(ji)成，他的網(wang)(wang)絡連接(jie)已比(bi)較(jiao)成熟(shu)和(he)流(liu)行，有MPI（多(duo)點(dian)接(jie)口）、PROIBUS和(he)以(yi)太網(wang)(wang)，使通訊和(he)編程變的簡(jian)單和(he)多(duo)選(xuan)，并可以(yi)借助于HWConfig工具可以(yi)進行組態(tai)和(he)設置參數。

S7-300的(de)(de)模(mo)(mo)塊(kuai)(kuai)(kuai)(kuai)稍微(wei)多(duo)一(yi)(yi)(yi)(yi)點(dian)，除了模(mo)(mo)塊(kuai)(kuai)(kuai)(kuai)（）和200的(de)(de)EM模(mo)(mo)塊(kuai)(kuai)(kuai)(kuai)同類型之外，它還有(you)接口模(mo)(mo)塊(kuai)(kuai)(kuai)(kuai)（IM）——用來進行(xing)多(duo)層(ceng)組(zu)態(tai)，把總(zong)線從一(yi)(yi)(yi)(yi)層(ceng)傳到另一(yi)(yi)(yi)(yi)層(ceng)；占位模(mo)(mo)塊(kuai)(kuai)(kuai)(kuai)（DM）——為(wei)設置參(can)數(shu)的(de)(de)模(mo)(mo)塊(kuai)(kuai)(kuai)(kuai)保留一(yi)(yi)(yi)(yi)個(ge)插槽(cao)或(huo)為(wei)以(yi)后安(an)裝(zhuang)的(de)(de)模(mo)(mo)塊(kuai)(kuai)(kuai)(kuai)接口保留一(yi)(yi)(yi)(yi)個(ge)插槽(cao)；功(gong)能(neng)模(mo)(mo)塊(kuai)(kuai)(kuai)(kuai)（M）——執行(xing)功(gong)能(neng)，如計(ji)數(shu)、定位、閉環控制相(xiang)當(dang)對(dui)CPU功(gong)能(neng)的(de)(de)一(yi)(yi)(yi)(yi)個(ge)擴(kuo)展或(huo)補充；通信(xin)處理器（CP）——提供點(dian)對(dui)點(dian)連接、PROIBUS和以(yi)太網。

西門子PLC一級總代理--CPU設計

選(xuan)擇(ze)器(qi)有：MRES=模塊復位功(gong)能(neng)；SOP=停止，程序不執行；RUN=程序執行，編程器(qi)只讀操作；RUN-P=程序執行，編程器(qi)可讀可寫操作。

狀態指示器(qi)：S，BA=電池故障；DC5V=內部5V DC電壓指示；RCE=表示至少有一(yi)個輸入或(huo)輸出比(bi)強制；RUN=當(dang)CPU啟(qi)動(dong)時閃(shan)爍，在運行下常(chang)亮(liang)；SOP=在停止下常(chang)亮(liang)，有存(cun)儲器(qi)復(fu)位請求(qiu)時慢(man)速(su)閃(shan)爍，正在執行復(fu)位時閃(shan)爍。

MPI接(jie)(jie)(jie)口用來連接(jie)(jie)(jie)到(dao)編程設(she)備(bei)或其(qi)他(ta)(ta)設(she)備(bei)，DP接(jie)(jie)(jie)口用來直接(jie)(jie)(jie)連接(jie)(jie)(jie)到(dao)分布式I/O。西門子PLC S7-400，同西門子PLC S7-300的區別(bie)主要是規(gui)模和能上*強大，啟(qi)(qi)動類型有(you)冷啟(qi)(qi)動（CRS）和熱啟(qi)(qi)動（WRS）之(zhi)分，其(qi)他(ta)(ta)基本(ben)一樣。他(ta)(ta)還有(you)一個外部的電(dian)(dian)池電(dian)(dian)源(yuan)接(jie)(jie)(jie)口，當在(zai)線更換電(dian)(dian)池是可以向RAM提供后(hou)備(bei)電(dian)(dian)源(yuan)。

變成設備

變成(cheng)設備主(zhu)要有(you)PG720 PG740 PG760——可(ke)以(yi)(yi)(yi)理解(jie)成(cheng)裝有(you)編(bian)程(cheng)的手提電(dian)腦；也可(ke)以(yi)(yi)(yi)用直接(jie)安(an)裝有(you)SEP7(SIEMENS的編(bian)程(cheng))的PC來(lai)完成(cheng)。而實現通訊（要編(bian)程(cheng)*要和(he)PLC的CPU通訊上(shang)）的要求主(zhu)要在(zai)(zai)于接(jie)口：1、可(ke)以(yi)(yi)(yi)在(zai)(zai)PC上(shang)裝CP5611卡——上(shang)面有(you)MPI口，可(ke)以(yi)(yi)(yi)用電(dian)纜(lan)直接(jie)連接(jie)。2、加個PC適配器，把MPI口轉換成(cheng)RS-232口后(hou)接(jie)到PC上(shang)。3、PLC加CP343卡，使它具有(you)以(yi)(yi)(yi)太(tai)網口。

以(yi)上就是西門子PLC編程入門的基礎知識。

三(san)個西門子(zi)PLC編程實(shi)例解(jie)析

看(kan)視頻(pin)看(kan)得懂，看(kan)書也(ye)看(kan)得懂，但是看(kan)后(hou)這(zhe)些指令(ling)如何(he)應用還(huan)是不會(hui)，這(zhe)是我苦惱的(de)事情(qing)這(zhe)是很多人在(zai)PLC培訓(xun)提到(dao)(dao)的(de)問題。 小編在(zai)這(zhe)里提供幾(ji)個實例，引(yin)導大家進入實際應用。 1.電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)機(ji)星(xing)(xing)(xing)-三(san)(san)(san)角(jiao)(jiao)起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)（手動(dong)(dong)(dong)(dong)(dong)）控制 為(wei)了起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)流，電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)機(ji)起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)時很多時候采(cai)(cai)用降(jiang)壓(ya)起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)，其中三(san)(san)(san)相(xiang)異(yi)步電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)機(ji)采(cai)(cai)用自身繞組接(jie)線特點(dian)，可以(yi)采(cai)(cai)用繞組星(xing)(xing)(xing)形(xing)聯(lian)結(jie)起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)，起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)完成后(hou)再切(qie)(qie)(qie)換(huan)成三(san)(san)(san)角(jiao)(jiao)形(xing)聯(lian)結(jie)進入運行(xing)(xing)狀(zhuang)態。 停止時，主(zhu)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.6=0，星(xing)(xing)(xing)形(xing)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.7=0，三(san)(san)(san)角(jiao)(jiao)形(xing)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)1.0=0。 起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)時，主(zhu)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.6=1，星(xing)(xing)(xing)形(xing)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.7=1，三(san)(san)(san)角(jiao)(jiao)形(xing)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)1.0=0。 運行(xing)(xing)時，主(zhu)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.6=1，星(xing)(xing)(xing)形(xing)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.7=0，三(san)(san)(san)角(jiao)(jiao)形(xing)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)1.0=1。 起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)操(cao)作，按(an)動(dong)(dong)(dong)(dong)(dong)起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)按(an)鈕(niu)I0.5=1；切(qie)(qie)(qie)換(huan)操(cao)作，按(an)動(dong)(dong)(dong)(dong)(dong)切(qie)(qie)(qie)換(huan)按(an)鈕(niu)I0.6=1；停止操(cao)作，按(an)動(dong)(dong)(dong)(dong)(dong)停止按(an)鈕(niu)I0.7=1。 控制程序(xu)(xu)1 程序(xu)(xu)中出現(xian)(xian)有符號，需(xu)要在(zai)符號表(biao)定義，默認設置就會(hui)在(zai)程序(xu)(xu)界(jie)面出現(xian)(xian)。 當電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)機(ji)在(zai)停止狀(zhuang)態時，按(an)動(dong)(dong)(dong)(dong)(dong)起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)按(an)鈕(niu)I0.5=1，電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)機(ji)隨即(ji)星(xing)(xing)(xing)形(xing)起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)，主(zhu)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.6=1和星(xing)(xing)(xing)形(xing)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.7=1。主(zhu)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.6常(chang)開(kai)觸點(dian)維(wei)持著(zhu)主(zhu)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)導通。 當星(xing)(xing)(xing)形(xing)起(qi)(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)完成后(hou)，切(qie)(qie)(qie)換(huan)到(dao)(dao)運行(xing)(xing)狀(zhuang)態時，按(an)動(dong)(dong)(dong)(dong)(dong)切(qie)(qie)(qie)換(huan)按(an)鈕(niu)I0.6=1，這(zhe)時會(hui)切(qie)(qie)(qie)換(huan)到(dao)(dao)三(san)(san)(san)角(jiao)(jiao)形(xing)運行(xing)(xing)狀(zhuang)態，主(zhu)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)0.6=1和三(san)(san)(san)角(jiao)(jiao)形(xing)繼(ji)(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)...