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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?；緮?shù)據(jù)類型在第4章中已有過介紹，本節(jié)專門說明復(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 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。通過下標(biāo)訪問數(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。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，每一維的首尾之間用雙點(diǎn)隔開。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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