西門子軟件 6AV63812BH073AX0
6AV63812BH073AX0
模式說明及舉例
7.1.脈沖輸出模式:
脈沖輸出模式可以使 2 PULSE 模塊在輸出使能后通過一定時間的延遲后輸出一個給定脈沖寬度的脈沖輸出。時序請參見圖 7:
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圖 7 脈沖輸出時序圖
脈沖數(shù)出參數(shù)配置:

圖 8 脈沖數(shù)出參數(shù)配置
在 2 PULSE 模塊參數(shù)界面,選擇運行模式為 pulse output,時基為 1ms,DI 輸入功能為普通輸入,所以在運行的時候輸出將不參考硬件使能的狀態(tài)。啟動延時設(shè)為 1000ms。
通過圖 7 可以看出脈沖輸出模式需要在程序里面給定給兩個主要的數(shù)值:脈沖時間和接通延時時間,其中:
脈沖時間 = 給定數(shù)值 * 參數(shù)設(shè)定的時基
接通延時 = 延時系數(shù) * 0.1 * 參數(shù)設(shè)定的啟動延時
變量表賦值:

圖 9 脈沖數(shù)出賦值變量表
根據(jù)輸入/輸出地址定義,將相應(yīng)的值寫到相應(yīng)的地址中,在本例中數(shù)值為:
脈沖時間 = 2000 * 1ms= 2s
接通延時 = 10 * 0.1 * 1000ms = 1s
這時,當激活軟件使能 DBX52.0 時,觀察 DB2.DBX0.1 會經(jīng)過 1s 的延時后輸出一個 2s 寬的脈沖。
7.2.脈寬調(diào)制(PWM)模式:
在脈寬調(diào)制模式下,該模塊可以輸出一個脈沖序列,用戶可以通過修改輸出值來修改脈沖序列的脈沖寬度,可以通過系數(shù)修改脈沖的周期。時序見圖 10

圖 10 脈寬調(diào)制(PWM)模式時序圖
脈寬調(diào)制(PWM)的參數(shù)配置

圖 11 脈寬調(diào)制(PWM)模式參數(shù)配置
1. 選擇運行模式為脈寬調(diào)制(PWM);
2. 輸出 PWM (脈寬調(diào)制)的輸出模式:本例中使用千分數(shù);
3. 時基為 1ms;
4. DI 為普通輸入,不作為硬件使能;
5. 啟動延時為 1000ms;
6. 最小脈沖寬度 10ms (調(diào)節(jié)脈沖寬度時,最小不能小于此值);
7. 脈沖周期時間為 1000ms;
脈寬調(diào)制(PWM)模式可以在程序里面給定給兩個主要的數(shù)值:脈沖寬度和脈沖周期,其中:
脈沖周期 = 周期系數(shù) * 0.1 * 參數(shù)預(yù)設(shè)的脈沖周期
脈沖寬度 = (給定數(shù)值 / 1000) * 脈沖周期
通過變量表賦值:

圖 12 脈寬調(diào)制(PWM)模式賦值變量表
根據(jù)輸入/輸出地址定義,將相應(yīng)的值寫到相應(yīng)的地址中,在本例中數(shù)值為:
脈沖周期 =10 * 0.1 * 1000ms = 1s
脈沖寬度 = (500 / 1000) * 1s = 0.5s
這時,當激活軟件使能 DBX52.0 時,觀察 DB2.DBX 0.1 將經(jīng)過 1s 的延時后輸出一個占空比為 1:1 的 1Hz 頻率脈沖。要改變脈沖寬度,直接修改 DB2.DBW 50 的給定值即可。
7.3.脈沖串輸出模式:
在脈沖串輸出模式中,該模塊可以輸出一個固定脈沖個數(shù)的脈沖串,用戶可以定義脈沖個數(shù)和修改脈沖周期時間。時序見圖:
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西門子軟件 6AV63812BH073AX0