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7. 生成OB1
OB1決定用戶(hù)程序的結(jié)構(gòu)，也包含要傳送給各個(gè)功能的參數(shù)。例如：
(1) 為進(jìn)料泵和攪拌電機(jī)而編制的STL段中為電機(jī)FB提供啟動(dòng)( “Start”)、停止(“Stop”)，響應(yīng)(“Response”)以及復(fù)位維護(hù)顯示(“Reset_Maint”)的輸入?yún)?shù)。PLC的每一個(gè)循環(huán)周期都會(huì)處理這個(gè)電機(jī)的FB。
(2) 如果電機(jī)的FB被處理，則輸入Timer_No和Response_Time指示所使用的定時(shí)器功能以及要測(cè)量的時(shí)間。
(3) 因?yàn)殚y門(mén)的FC和電機(jī)的FB是在OB1中調(diào)用的，所以它們?cè)诿總€(gè)程序循環(huán)都會(huì)被可編程序控制器處理。程序?yàn)樘幚磉M(jìn)料泵和攪拌電機(jī)的控制任務(wù)，使用電機(jī)的FB時(shí)分別配備了不同的背景DB。
Network 1 進(jìn)料泵A的互鎖
A “EMER_ STOP_off”
A “Tank_ below_max”
AN “Drain”
＝ #Enable_Motor
Network 2 為配料A調(diào)用電機(jī)的FB
A “Feed_pump_A_Start”
A #Enable_Motor
＝ #Start_Fulfilled
A(
O “Feed_Pump_A_Stop”
ON #Enable_Motor
)
＝ #Stop_Fulfilled
CALL “Motor_block”， “DB_feed_pump_A”
Start ：=Start Fulfilled
Stop ：=Stop_Fulfilled
Response ：=“Flow_ A”
Reset_ Maint ：＝“Reset_maint”
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