描述

雙字尋址（32bit）

雙字尋址由存儲(chǔ)區(qū)標(biāo)識(shí)符、雙字標(biāo)識(shí)符及字節(jié)起始地址組合而成。如VD100，其雙字尋址方式如圖所示。

雙字尋址的格式：［區(qū)域標(biāo)識(shí)］［雙字標(biāo)識(shí)符］.［字節(jié)起始地址］

為使用方便和使數(shù)據(jù)與存儲(chǔ)器單元長(zhǎng)度統(tǒng)一，S7-200系列中，一般存儲(chǔ)單元都具有位尋址、字節(jié)尋址、字尋址及雙子尋址4種尋址方式。尋址時(shí)，不同的尋址方式情況下，選用同一字節(jié)地址作為起始地址時(shí)，其所表示的地址空間是不同的。

在S7-200中，一些存儲(chǔ)數(shù)據(jù)專(zhuān)用的存儲(chǔ)單元不支持位尋址方式，主要有模擬量輸入/輸出、累加器、定時(shí)器和計(jì)數(shù)器的當(dāng)前值存儲(chǔ)器等。而累加器不論采用何種尋址方式，都要占用32位，模擬量單元尋址時(shí)均以偶數(shù)標(biāo)志。此外，定時(shí)器、計(jì)數(shù)器具有當(dāng)前值存儲(chǔ)器及位存儲(chǔ)器，屬于同一個(gè)器件的存儲(chǔ)器采用同一標(biāo)號(hào)尋址。

歐美品牌停產(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應(yīng)用于以下領(lǐng)域：

1,《發(fā)電廠(chǎng)DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠(chǎng)藥液恒流量計(jì)算機(jī)控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線(xiàn),變電站綜合自動(dòng)化控制系列

本特利，英維思，伍德沃德，福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè)，ACSO，力士樂(lè)等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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