6SN1118-0DM31-0AA0
6SN1118-0DM31-0AA0
6SN1118-0DM31-0AA0
特殊標(biāo)志繼電器用“SM”表示,特殊標(biāo)志繼電器區(qū)根據(jù)功能和性質(zhì)不同具有位、字節(jié)、字和雙字操作方式。其中SMB0、SMB1為系統(tǒng)狀態(tài)字,只能讀取其中的狀態(tài)數(shù)據(jù),不能改寫,可以位尋址。系統(tǒng)狀態(tài)字中部分常用的標(biāo)志位說明如下:
SM0.0:始終接通;
SM0.1:掃描為1,以后為0,常用來對(duì)程序進(jìn)行初始化;
SM0.2:當(dāng)機(jī)器執(zhí)行數(shù)學(xué)運(yùn)算的結(jié)果為負(fù)時(shí),該位被置1;
SM0.3:開機(jī)后進(jìn)入RUN方式,該位被置1一個(gè)掃描周期;
SM0.4:該位提供一個(gè)周期為1分鐘的時(shí)鐘脈沖,30秒為1,30秒為0;
SM0.5:該位提供一個(gè)周期為1秒鐘的時(shí)鐘脈沖,0.5秒為1,0.5秒為0;
SM0.6:該位為掃描時(shí)鐘脈沖,本次掃描為1,下次掃描為0;
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