故障參考地址系列90-30/90-20/MicroPLC中的故障參考地址只有一類:故障累積(summary)參考地址。將故障累加參考地址登記,以表明何種故障已發(fā)生。故障地址將一直維持導(dǎo)通,直到PLC被清屏或直到應(yīng)用程序清屏。下面是一個(gè)故障位先置后清的例子。在該例中,當(dāng)掃描超限狀態(tài)發(fā)生時(shí),線圈Light-01(燈-01)接通,燈和OV-SWP觸點(diǎn)將維持通,直到%10359觸點(diǎn)閉合為止。

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