延时断开定时器 OFDT 是当断电时计时，得电时清 0。时间单元为 0.1 秒, 0.01 秒, 0.001 秒。计时单元个数范围 0 ～ +32,767 。 此定时器断电时保持，上电 时不会自动初始化。 Enable Preset Value OFDT 1.00s PV (Q) Address-3 words CV Current Value 当断开延时定时器先得电时，它将向右通流并且当前值被置为 0，
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