描述
IC694ALG220
在用戶程序執(zhí)行階段，可編程邏輯控制器總是按由上而下的順序依次地掃描用戶程序(梯形圖)。在掃描每一條梯形圖時，又總是先掃描梯形圖左邊的由各觸點構(gòu)成的控制線路，并按先左后右、先上后下的順序?qū)τ捎|點構(gòu)成的控制線路進行邏輯運算，然后根據(jù)邏輯運算的結(jié)果，刷新該邏輯線圈在系統(tǒng)RAM存儲區(qū)中對應位的狀態(tài)；或者刷新該輸出線圈在I/O映象區(qū)中對應位的狀態(tài)；或者確定是否要執(zhí)行該梯形圖所規(guī)定的特殊功能指令。
即，在用戶程序執(zhí)行過程中，只有輸入點在I/O映象區(qū)內(nèi)的狀態(tài)和數(shù)據(jù)不會發(fā)生變化，而其他輸出點和軟設備在I/O映象區(qū)或系統(tǒng)RAM存儲區(qū)內(nèi)的狀態(tài)和數(shù)據(jù)都有可能發(fā)生變化，而且排在上面的梯形圖，其程序執(zhí)行結(jié)果會對排在下面的凡是用到這些線圈或數(shù)據(jù)的梯形圖起作用；相反，排在下面的梯形圖，其被刷新的邏輯線圈的狀態(tài)或數(shù)據(jù)只能到下一個掃描周期才能對排在其上面的程序起作用。
在程序執(zhí)行的過程中如果使用立即I/O指令則可以直接存取I/O點。即使用I/O指令的話，輸入過程影像寄存器的值不會被更新，程序直接從I/O模塊取值，輸出過程影像寄存器會被立即更新，這跟立即輸入有些區(qū)別。
產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊
PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
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