在PLC中有一個(gè)概念叫數(shù)據(jù)存儲(chǔ)區(qū),在數(shù)據(jù)存儲(chǔ)區(qū)域中劃分為I輸入、Q輸出、M內(nèi)部?jī)?nèi)存位、SM特殊內(nèi)存位、V變量?jī)?nèi)存,每一種區(qū)域都可以用數(shù)據(jù)類型表示其長(zhǎng)短.
比如VB100,表示V變量一個(gè)B（字節(jié)）大小,字節(jié)地址是100,一個(gè)字節(jié)是8位,VB100這個(gè)字節(jié)中包括了VB100.0、VB100.1、VB100.2、VB100.3、VB100.4、VB100.5、VB100.6、VB100.7共8位.
再舉個(gè)例子：QW0,Q表示輸出的存儲(chǔ)區(qū),W表示一個(gè)字的長(zhǎng)度,地址是0,一個(gè)字包括兩個(gè)字節(jié),共16位,那么QW0包括QB0和QB1兩個(gè)字節(jié),QB0是高8位,QB1是低8位.
2.你所說(shuō)的外設(shè)端子應(yīng)該是指PLC的輸入和輸出端子,I就是輸入?yún)^(qū)域的標(biāo)示符,Q就是輸出區(qū)域的標(biāo)示符,比如你看到的輸入端子上標(biāo)有I0.0,I0.1,0.2,0.3等,
表示的是位大小的輸入,在程序中可以用I0.0等這樣的位去控制程序,也可以用IB0（0.0-0.7共8位）去控制程序,就根據(jù)你的程序需要了
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CIS0.1 QASS TECHNOLOGIES MONITOR
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