CAT 1305-BA01A-HA2    CAT 1305-BA01A-HA2 
樓主觀察到的現(xiàn)象不奇怪，S7-300/400的定時器自動選擇時間基準，從仿真和上圖中定時器的當前值可以看出，預(yù)設(shè)值為6s和60s的定時器的時間基準分別為10ms和100ms。定時器的定時是有誤差的，僅僅因為時間基準不同，也會使兩個定時器的積累誤差不同。
S7-200的10ms和100ms的定時器的運行機制*不同，100ms的定時器與指令的執(zhí)行有關(guān)，10ms定時器是在每個掃描周期開始時處理時間當前值的。S7-300/400也有可能這樣處理。
樓主采用的定時器電路在前后兩段定時的切換時需要一個掃描周期。這也會影響到兩個定時器的時間同步。
對于一般的應(yīng)用，這種誤差無關(guān)緊要。要求準確的定時可采用循環(huán)中斷組織塊。
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廈門岳航計算機工程有限公司
：黃華新           ：2339016238
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：2339016238           
地址；廈門思明區(qū)湖濱東路湖光大廈18樓A單元
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