系列90-30/20/Micro PLC通常以標準程序掃描方式操作。其它操作模式包括VO中斷方式下停止、V0使能方式下停止和恒定掃描方式。該章所描述的每一種掃描方式都是由外部過程和應(yīng)用配置的設(shè)定來控制的。在每次掃描開始時,PLC都要確定這次操作模式的決定。

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