Rexroth 1622-794-10現(xiàn)貨
公司理念:做思想巨人,做行動的鐵人,奉行把個人的發(fā)展與公司的發(fā)展做到有機(jī)的結(jié)合的共同價值觀。我們發(fā)揮公司多年積累的優(yōu)勢與有利條件,以效益為中心,以改革促發(fā)展,以創(chuàng)新求進(jìn)步,加快發(fā)展步伐,逐步實(shí)現(xiàn)“創(chuàng)造大眾的信心與價值,造福于大眾富裕與安寧”的公司長期發(fā)展愿景。
福州聚福興自動化有限公司
(4) 當(dāng)排料閥打開時,進(jìn)料泵的啟動必須被鎖定。
(5) 在啟動進(jìn)料泵后1 s內(nèi)必須打開入口閥和進(jìn)料閥。
(6) 在進(jìn)料泵停止后(來自流量傳感器的信號)閥門必須立即被關(guān)閉以防止配料從泵中泄露。
(7) 進(jìn)料泵的啟動與一個時間監(jiān)控功能相結(jié)合,換句話說,在泵啟動后的7 s之內(nèi),流量傳感器會報告溢出。
(8) 當(dāng)進(jìn)料泵運(yùn)行時,如果流量傳感器沒有流量信號,進(jìn)料泵必須盡可能快地斷開。
(9) 必須對進(jìn)料泵啟動的次數(shù)進(jìn)行計數(shù)(維護(hù)間隔)。
2) 混合罐區(qū)域
(1) 當(dāng)罐的液面?zhèn)鞲衅髦甘?ldquo;液面低于低限”或排料閥打開時,攪拌電機(jī)的啟動必須被鎖定。
(2) 攪拌電機(jī)在達(dá)到額定速度時要發(fā)出一個響應(yīng)信號。如果在電機(jī)啟動后10 s內(nèi)還未接收到該信號,則電機(jī)必須被斷開。
(3) 必須對攪拌電機(jī)的啟動次數(shù)進(jìn)行計數(shù)(維護(hù)間隔)。
(4) 在混合罐中必須安裝三個傳感器。① 罐裝滿:一個常閉觸點(diǎn)。當(dāng)達(dá)到罐的高液面時,該觸點(diǎn)斷開。② 罐中液面高于低限:一個常開觸點(diǎn)。如果達(dá)到低限,該觸點(diǎn)關(guān)閉。③ 罐非空:一個常開觸點(diǎn),如果罐不空,該觸點(diǎn)閉合。
3) 排料區(qū)域
(1) 罐內(nèi)產(chǎn)品的排出由一個螺線管閥門控制。
(2) 這個螺線管閥門由操作員控制,但是遲在“罐空”信號產(chǎn)生時,該閥必須被關(guān)閉。
(3) 當(dāng)攪拌電機(jī)在工作或罐空時打開排料閥必須被鎖定。
3. 定義邏輯塊
通過程序塊可以將用戶程序分布到不同的塊中并建立塊調(diào)用的分層結(jié)構(gòu)來組織程序。本例中用戶程序主要由組織塊OB1、功能塊FB1、功能FC1及三個數(shù)據(jù)塊DB1~DB3組成。圖5.12所示為結(jié)構(gòu)化編程的塊的分層調(diào)用結(jié)構(gòu)。
(1) OB1:與CPU操作系統(tǒng)的接口,包含主要程序。在OBl中調(diào)用塊FBl和FCl并傳送控制過程所需的特定參數(shù)。
(2) FB1:用于配料A的進(jìn)料泵、配料B的進(jìn)料泵和攪拌電機(jī)的控制。由于要求一致(接通、斷開、計數(shù)應(yīng)用程序等),可以通過同一個功能塊實(shí)現(xiàn)。
(3) 背景DB1~DB3:用于控制配料A、配料B的進(jìn)料泵和攪拌電機(jī)的實(shí)參及靜態(tài)數(shù)據(jù)各不相同,因此分別存儲在與FBl相關(guān)的三個背景DB中。
(4) FC1:用于閥的控制。配料A和B的入口閥和進(jìn)料閥以及排料閥共同使用本邏輯塊。
指定符號名
如果在用戶程序中使用了符號,則必須用STEP 7在符號表中對這些符號進(jìn)行定義。表5.6所示為所用的程序組件的符號名及地址。
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