109-C09FDE1C-1-4G現(xiàn)貨
主營:品牌的PLC 、DCS 系統(tǒng)備件 模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)⑥銷售ABB Robots. FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、Panasonic Robots、MOTOMAN Robots
⑦estinghouse(西屋): OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場輸入/輸出模塊)順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉換、輸入/輸出信號處理、數(shù)據(jù)通信及處理等。
Invensys Triconex: 冗余容錯控制系統(tǒng)、基于三重模件冗余(TMR)結構的現(xiàn)代化的容錯控制器⑨Siemens(西門子):Siemens MOORE, Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅動模塊等。
⑾Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列
) 臨時變量
臨時變量僅在邏輯塊運行時有效,邏輯塊結束時存儲臨時變量的內存被操作系統(tǒng)另行 分配。S7將臨時變量定義在L堆棧中,L堆棧是為存儲邏輯塊的臨時變量而專設的。當塊程序運行時,在L堆棧中建立該塊的臨時變量,一旦塊執(zhí)行結束,堆棧重新分配,因而信息丟失。
邏輯塊局部數(shù)據(jù)的數(shù)據(jù)類型
在變量聲明表中,要明確局部數(shù)據(jù)的數(shù)據(jù)類型,這樣操作系統(tǒng)才能給變量分配確定的 存儲空間。局部數(shù)據(jù)可以是基本數(shù)據(jù)類型或復式數(shù)據(jù)類型,也可以是專門用于參數(shù)傳遞 的所謂的“參數(shù)類型”。參數(shù)類型包括定時器、計數(shù)器、塊的地址或指針等,見表5.2。表5.2 參數(shù)類型變量
參數(shù)類型 大 小 說 明
定時器(Timer) 2 B 在功能塊中定義一個定時器形參,調用時賦予定時器實參
計數(shù)器(Counter) 2 B 在功能塊中定義一個計數(shù)器形參,調用時賦予計數(shù)器實參
塊:
Block_FB
Block_FC
Block_DB
Block_SDB 2 B 在功能塊中定義一個功能塊或數(shù)據(jù)塊形參變量,調用時給功能塊類或數(shù)據(jù)塊類形參賦予實際的功能塊或數(shù)據(jù)塊編號,如
FC 101、DB 42
指針(Pointer) 6 B 在功能塊中定義一個形參,該形參說明的是內存的地址指針。例如,調用時可給形參賦予實參P#M50.0,以訪問內存M50.0
ANY 10 B 當實參的數(shù)據(jù)類型未知時,可以使用該類型
1) 定時器或計數(shù)器參數(shù)類型
在功能塊中定義一個定時器或計數(shù)器類型的形參,功能塊就能使用一個定時器或計數(shù)器,而不需明確具體的定時器或計數(shù)器,等到調用該功能塊時再確定定時器或計數(shù)器號。這使用戶程序能靈活性地分配和使用定時器或計數(shù)器。當給定時器或計數(shù)器參數(shù)類型形參分配實參時,在“T”或“C”后跟一個有效整數(shù),如T 100。
2) 塊參數(shù)類型
當定義一個作為輸入輸出的塊時,參數(shù)聲明決定了塊的類型(FB、FC、DB等)。當為塊參數(shù)類型形參分配實參時,可以使用物理地址,如FC 101,也可使用符號地址,如“valve
3) 指針參數(shù)類型
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