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l  功能：對(duì)內(nèi)部元件x、y、m、s、t、c的信號(hào)進(jìn)行計(jì)數(shù)。

l  結(jié)構(gòu)：線圈、觸點(diǎn)、設(shè)定值寄存器、當(dāng)前值寄存器。

l  地址編號(hào)：字母c＋（十進(jìn)制）地址編號(hào)  （c0～ c255）

l  設(shè)定值： 等于計(jì)數(shù)脈沖的個(gè)數(shù)。用常數(shù)k設(shè)定。

l  16位低速計(jì)數(shù)器

Ø  通用加計(jì)數(shù)器：c0～c99(100點(diǎn))；設(shè)定值區(qū)間為k1～k32767

Ø  停電保持加計(jì)數(shù)器：c100～c199(100點(diǎn))；設(shè)定區(qū)間為k1～k32767

特點(diǎn)：停電保持計(jì)數(shù)器在外界停電后能保持當(dāng)前計(jì)數(shù)值不變，恢復(fù)來(lái)電時(shí)能累計(jì)計(jì)數(shù)。

l  原理：計(jì)數(shù)信號(hào)每接通一次（上升沿到來(lái)），加計(jì)數(shù)器的當(dāng)前值加1，當(dāng)前值達(dá)到設(shè)定值時(shí)，計(jì)數(shù)器觸點(diǎn)動(dòng)作；復(fù)位信號(hào)接通時(shí)計(jì)數(shù)器復(fù)位。

l  計(jì)數(shù)器處于復(fù)位狀態(tài)時(shí)，當(dāng)前值清0，觸點(diǎn)復(fù)位，且不計(jì)數(shù)。

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