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5. 生成電機(jī)的FB
電機(jī)的FB包括以下邏輯功能：
(1) 啟動(dòng)和停止輸入。
(2) 允許設(shè)備操作的一系列互鎖(泵和攪拌電機(jī))?；ユi狀態(tài)存儲(chǔ)在OB1的臨時(shí)局域數(shù)據(jù)(L堆棧)中(“Motor_enable”和“Valve_enable”)，并且當(dāng)電機(jī)的FB被處理時(shí)與啟動(dòng)和停止的輸入進(jìn)行邏輯組合。
(3) 來(lái)自設(shè)備的反饋必須在一個(gè)特定的時(shí)間內(nèi)出現(xiàn)，否則就假定有故障或錯(cuò)誤出現(xiàn)，并使電機(jī)停止。
(4) 時(shí)間點(diǎn)和響應(yīng)時(shí)間或錯(cuò)誤故障循環(huán)持續(xù)時(shí)間都必須被指定。
(5) 如果啟動(dòng)按鈕被按下并且電機(jī)被使能，則設(shè)備自行接通并運(yùn)行直至按下停機(jī)按鈕。
(6) 當(dāng)設(shè)備接通時(shí)，一個(gè)定時(shí)器啟動(dòng)運(yùn)行，如果在定時(shí)器的時(shí)間到達(dá)之前未接到來(lái)自設(shè)備的響應(yīng)信號(hào)，則停機(jī)。
在STEP 7中，每一個(gè)被不同的塊調(diào)用的塊一定要在調(diào)用它的塊之前生成，因此在樣板程序中必須在OBl之前先生成電機(jī)的FB。STL編程語(yǔ)言的FBl程序部分如下：
Network l 啟動(dòng)停止和鎖存
A(
O #Start
O #Motor
)
AN #Stop
= #Motor
Network 2 啟動(dòng)監(jiān)控
A #Motor
L #Response_Time
SD #Timer No
AN #Motor
R #Timer No
L #Timer No
T #Timer bin

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