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功能表圖（Sepuential Function Chart）程序設(shè)計語言
功能表圖程序設(shè)計語言是用功能表圖來描述程序的一種程序設(shè)計語言。它是近年來發(fā)展起來的一種程序設(shè)計語言。采用功能表圖的描述，控制系統(tǒng)被分為若干個子系統(tǒng)，從功能入手，使系統(tǒng)的操作具有明確的含義，便于設(shè)計人員和操作人員設(shè)計思想的溝通，便于程序的分工設(shè)計和檢查調(diào)試。
功能表圖程序設(shè)計語言的特點是：
?。ǎ保┮怨δ転橹骶€，條理清楚，便于對程序操作的理解和溝通；
?。ǎ玻Υ笮偷某绦?，可分工設(shè)計，采用較為靈活的程序結(jié)構(gòu)，可節(jié)省程序設(shè)計時間和調(diào)試時間；
?。ǎ常┏Ｓ糜谙到y(tǒng)的規(guī)模校大，程序關(guān)系較復(fù)雜的場合；
?。ǎ矗┲挥性诨顒硬降拿詈筒僮鞅粓?zhí)行，對活動步后的轉(zhuǎn)換進(jìn)行掃描，因此，整個程序的掃描時間較其他程序編制的程序掃描時間要大大縮短。
功能表圖來源于佩特利（Petri）網(wǎng)，由于它具有圖形表達(dá)方式，能較簡單和清楚地描述并發(fā)系統(tǒng)和復(fù)雜系統(tǒng)的所有現(xiàn)象，并能對系統(tǒng)中存有的象死鎖、不等反?，F(xiàn)象進(jìn)行分析和建模，在模型的基礎(chǔ)上能直接編程，所以，得到了文泛的應(yīng)用。近幾年推出的可編程控制器和小型集散控制系統(tǒng)中也已提供了采用功能表圖描述語言進(jìn)行編程的軟件。關(guān)于佩特利（Petri）網(wǎng)的一些基本概念，我在以后有機(jī)會時再介紹給各位，以有助于對功能表圖的進(jìn)一步理解。
模入模塊通道起始地址
2.0 In CH_LEN INT
要讀入的通道數(shù)
4.0 In DB_No INT
存儲數(shù)據(jù)塊號
6.0 In DBW_Addr INT
存儲在數(shù)據(jù)塊中的字地址
Network 1
L #DB_No
T LW0
OPN DB[LW 0] 打開存儲數(shù)據(jù)塊
L #PIW_Addr
SLD 3 形成模入模塊地址指針
T LD4 在臨時本地數(shù)據(jù)雙字LD 4中存儲模入模塊地址指針
L #DBW_Addr
SLD 3 形成數(shù)據(jù)塊存儲地址指針
T LD8 在臨時本地數(shù)據(jù)雙字LD 8中存入數(shù)據(jù)塊存儲地址指針
L #CH_LEN 以要讀入的通道數(shù)為循環(huán)次數(shù)，裝入累加器1
2．讀模擬輸入量程序
一些S7-300的應(yīng)用系統(tǒng)中，使用8通道模擬量模塊采集信號，當(dāng)模塊數(shù)量較多時，讀模擬輸入量就很繁瑣。下面給出一個通用程序FC100，利用它可以方便地把模擬量讀回并順序存入數(shù)據(jù)塊，因為模入模塊的起始地址、通道數(shù)、存儲數(shù)據(jù)塊號及數(shù)據(jù)在數(shù)據(jù)塊中的存儲起始位置均是可變的，所以可在調(diào)用FC100時靈活確定。
Address Decl. Symbol Data Type Initial Value Comment
0.0 In PIW_Addr INT
模入模塊通道起始地址
2.0 In CH_LEN INT
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