注意:如果CPU已經(jīng)在運(yùn)行模式時(shí)，使輸出失效的命令不會(huì)立即被執(zhí)行，到下一個(gè)周期收到同樣命令時(shí)才執(zhí)行。這樣，想要執(zhí)行SVC_REQ#43命令之前要使輸出失效至少一個(gè)掃描周期。當(dāng)首要單元的輸出被使能時(shí)，SVC_ _REQ#43不能在首要單元中被執(zhí)行。如果有此類(lèi)語(yǔ)句，這個(gè)功能塊將被拒絕執(zhí)行。因?yàn)镻LC在執(zhí)行此操作時(shí)會(huì)發(fā)生不同步的現(xiàn)象，所以會(huì)在執(zhí)行SVC_ REQ#43命令時(shí)產(chǎn)生-一個(gè)錯(cuò)誤日志。

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