GE IIC600PM510A 

隨著PLC在順序控制上的廣泛使用，也成為在制造業(yè)的通用裝置。但你知道在PLC中傳送和比較指令有什么作用呢？若你也對此不了解，就隨儀器儀表世界網(wǎng)小編從下文找到答案吧。

1、 用以獲得程序的初始工作數(shù)據(jù)

一個控制程序總是需要初始數(shù)據(jù)。這些數(shù)據(jù)可以從輸入端口上連接的外部器件獲得，需要使用傳送指令讀取這些器件上的數(shù)據(jù)并送到內(nèi)部單元；初始數(shù)據(jù)也可以用程序設(shè)置，即向內(nèi)部單元傳送立即數(shù)；另外，某些運(yùn)算數(shù)據(jù)存儲在機(jī)內(nèi)的某個地方，等程序開始運(yùn)行時通過初始化程序送到工作單元。

2、機(jī)內(nèi)數(shù)據(jù)的存取管理

在數(shù)據(jù)運(yùn)算過程中，機(jī)內(nèi)的數(shù)據(jù)傳送是不可缺少的。運(yùn)算可能要涉及不同的工作單元，數(shù)據(jù)需在他們之間傳送；運(yùn)算可能會產(chǎn)生一些中間數(shù)據(jù)，這需要傳送到適當(dāng)?shù)牡胤綍簳r存放；有時機(jī)內(nèi)的數(shù)據(jù)需要備份保存，這要找地方把這些數(shù)據(jù)存儲妥當(dāng)。總之，對一個涉及數(shù)據(jù)運(yùn)算的程序，數(shù)據(jù)管理是很重要的。

此外，二進(jìn)制和 BCD 碼的轉(zhuǎn)換在數(shù)據(jù)管理中也是很重要的。

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