S7-300C 集成高速計(jì)數(shù)器功能, 以314C 為例, 集成4 路60kHz的高速計(jì)數(shù)器。計(jì)數(shù)可分為：

1、連續(xù)計(jì)數(shù)--計(jì)到上跳到下限從新開始。

2、計(jì)數(shù)--計(jì)到上跳到下限等待新的觸發(fā)。

3、周期計(jì)數(shù)--從裝載值開始計(jì)數(shù), 到可設(shè)置上跳到裝載值從新計(jì)數(shù)。

操作

4.2 控制參數(shù)的設(shè)置

1、主計(jì)數(shù)方向可分上/下計(jì)數(shù)

2、門功能--只有在門打開時(shí)計(jì)數(shù)值才有效

1) 取消計(jì)數(shù)--門再次打開時(shí)計(jì)數(shù)值清零

2) 停止計(jì)數(shù)--門再次打開時(shí)計(jì)數(shù)從上次計(jì)數(shù)值開始計(jì)數(shù)

3、開始/停止值--周期計(jì)數(shù)時(shí)上限值

4、比較值--用于產(chǎn)生中斷

5、滯后值— 可防止臨界時(shí)產(chǎn)生的擾動(dòng)

操作參數(shù)

4.3 輸入/輸出的設(shè)置

1、輸入--1) 脈沖, 2) 硬件門, 3) 計(jì)數(shù)方向, 硬件門可使計(jì)數(shù)值更加

2、輸出--1) 設(shè)置比較器用于觸發(fā)快速輸出 2) 可設(shè)置輸出點(diǎn)脈沖時(shí)間

輸入輸出設(shè)置

4.4 中斷設(shè)置

產(chǎn)生中斷調(diào)用OB40(在basic parameters 選擇中斷或診斷+中斷)。

基本參數(shù)選擇中斷

中斷可選擇：

1、硬件門開中斷 2、硬件門關(guān)中斷 3、接近比較值中斷4、超上限中斷 5、超下限中斷

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