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四是制造業(yè)、消費(fèi)品相關(guān)制造業(yè)增長(zhǎng)動(dòng)能釋放,在供給側(cè)結(jié)構(gòu)性改革不斷發(fā)力的帶動(dòng)下,汽車制造業(yè)、專用設(shè)備制造業(yè)、電氣機(jī)械器材制造業(yè)、制造業(yè)、食品及酒飲料精制茶制造業(yè)、紡織服裝服飾業(yè)等行業(yè)PMI均位于53.0%以上的景氣區(qū)間,明顯高于制造業(yè)總體水平。 海通宏觀姜超認(rèn)為,10月制造業(yè)PMI出現(xiàn)下滑,其中前期迭創(chuàng)新高的購(gòu)進(jìn)價(jià)格也再度回落。從中觀高頻行業(yè)數(shù)據(jù)看,終端需求仍較低迷,工業(yè)生產(chǎn)明顯走弱,均指向4季度經(jīng)濟(jì)開(kāi)局偏弱;同時(shí),隨著地產(chǎn)銷售轉(zhuǎn)負(fù)、庫(kù)存周期已至尾聲、幣出口,短期經(jīng)濟(jì)仍趨下行,而總需求的回落也意味著通脹預(yù)期難以回升。 早在醞釀和建設(shè)之初,這個(gè)技術(shù)中心就備受關(guān)注,它到底有何實(shí)力?封面新聞?dòng)浾攥F(xiàn)場(chǎng)了解到,這個(gè)創(chuàng)新技術(shù)中心將以成都為基礎(chǔ),專注于西部乃至范圍內(nèi)工業(yè)4.0專業(yè)人才,博世力士樂(lè)在工業(yè)4.0領(lǐng)域的技術(shù)及成功則是實(shí)力保障。 據(jù)悉,博世力士樂(lè)及博世集團(tuán)在智能制造領(lǐng)域的技術(shù)專長(zhǎng)及項(xiàng)目,都將作為授課的教本,為學(xué)員提供涵蓋、生產(chǎn)、供應(yīng)鏈、工業(yè)4.0主題方案等4大類20多小類的智能制造專業(yè)培訓(xùn)。
STEP 7數(shù)據(jù)塊中的數(shù)據(jù)結(jié)構(gòu)形式比較豐富,數(shù)據(jù)塊中的數(shù)據(jù)既可以是基本數(shù)據(jù)類型,又可以是復(fù)式數(shù)據(jù)類型。所謂復(fù)式數(shù)據(jù)類型,是指位數(shù)超過(guò)32位的數(shù)據(jù)或由其它數(shù)據(jù)類型構(gòu)成的數(shù)據(jù)組。基本數(shù)據(jù)類型在第4章中已有過(guò)介紹,本節(jié)專門說(shuō)明復(fù)式數(shù)據(jù)類型。STEP 7允許4種復(fù)式數(shù)據(jù)類型,如表5.5所示。
名 稱 類 型 說(shuō) 明
日期-時(shí)間 DATE_AND_TIME 長(zhǎng)度為8 B(64位)。按BCD碼格式順序存儲(chǔ)以下信息:年(字節(jié)0)、月(字節(jié)1)、日(字節(jié)2)、小時(shí)(字節(jié)3)、分(字節(jié)4)、秒(字節(jié)5)、毫秒(字節(jié)6和7的高半字節(jié))、星期(字節(jié)7的低半字節(jié))
字符串 STRING 字符串是一組ascii 碼,一個(gè)串內(nèi)可定義多254個(gè)字符,占用256 B內(nèi)存。串中每個(gè)字符占用1 B,內(nèi)存中頭兩個(gè)字節(jié)存儲(chǔ)串的長(zhǎng)度信息。個(gè)字節(jié)存放此串的定義長(zhǎng)度(默認(rèn)值為254個(gè)字符),第二個(gè)字節(jié)存放字符串實(shí)際長(zhǎng)度。例如,String[7]定義長(zhǎng)度為7的字符串,占用內(nèi)存9 B(2+7)。若不定義長(zhǎng)度,則默認(rèn)為254個(gè)字符
數(shù)組 ARRAY 由一種數(shù)據(jù)類型組成的數(shù)據(jù)集合,數(shù)據(jù)類型可以是基本數(shù)據(jù)類型或復(fù)式數(shù)據(jù)類型。通過(guò)下標(biāo)訪問(wèn)數(shù)組中的數(shù)據(jù)??啥x到6維數(shù)組
構(gòu)造 STRUCT 由多種數(shù)據(jù)類型組成的數(shù)據(jù)集合
另一種復(fù)式數(shù)據(jù)類型稱為“用戶數(shù)據(jù)類型(UDT)”,它是利用STEP 7“程序編輯器”產(chǎn)生的,可命名構(gòu)造。將大量數(shù)據(jù)組織到UDT中,在生成數(shù)據(jù)塊或在變量聲明表中聲明變量時(shí)將變得更加方便。用戶還可為UDT聲明符號(hào)名。
日期-時(shí)間數(shù)據(jù)類型的名稱、位數(shù)及格式是由操作系統(tǒng)定義的,用戶不可改變,并且該類型在S7-300中必須用標(biāo)準(zhǔn)功能塊SFC才能訪問(wèn)。其它復(fù)式數(shù)據(jù)類型則由用戶在邏輯塊變量聲明表或數(shù)據(jù)塊中定義。
1. 數(shù)組
一個(gè)數(shù)組將同種數(shù)據(jù)類型組合成整體,但不能建立數(shù)組的數(shù)組。圖5.4表示一個(gè)二維 整數(shù)數(shù)組。數(shù)組的符號(hào)名是“Op_temps”,用符號(hào)名加下標(biāo)可訪問(wèn)數(shù)組中的數(shù)據(jù)。以圖5.4為例,個(gè)整數(shù)是Op_temps[1,1],第三個(gè)為Op_temps[l,3],第四個(gè)為Op_temps[2,1],第六個(gè)為Op_temps[2,3]。
1) 建立數(shù)組
在數(shù)據(jù)塊或變量聲明表中可定義數(shù)組。在聲明數(shù)組時(shí),首先給數(shù)組命名,接著使用關(guān)鍵字(ARRAY),然后在方括號(hào)中給出數(shù)組的大小及維數(shù)??梢远x多達(dá)6維的數(shù)組,并用下標(biāo)來(lái)標(biāo)識(shí)數(shù)組的大小。在方括號(hào)中放下標(biāo),各維之間用逗號(hào)隔開(kāi),每一維的首尾之間用雙點(diǎn)隔開(kāi)。一個(gè)下標(biāo)可以為任何一個(gè)整數(shù)值(范圍:-32 768~+32 767),并包括負(fù)數(shù)。如用ARRAY[1‥3, 1‥2, 1‥3, -2‥3, 30‥32, 1‥4]來(lái)定義變量Op_temps為6維數(shù)組。該數(shù)組的個(gè)整數(shù)為Op_temps[1, 1, 1, -2, 30, 1];后一個(gè)為Op_temps[3, 2, 3, 3, 32, 4]。圖5.5顯示了建立名字為Heat_2×3的二維數(shù)組(與圖5.4中的數(shù)組相似)。
2) 賦初始值
在建立數(shù)組時(shí),STEP 7允許以兩種方法給數(shù)組的元素賦初始值。對(duì)圖5.5中的數(shù)組,可以為6個(gè)元素賦初始值:17,23,-45,556,3342,0;
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