单稳态触发延时功能的使用方法（代码）
第一种：IF in THEN TP1(IN:= in, PT:=t#5ms , Q=> , ET=> );END_IFton1(IN:= TP1.Q, PT:= T#20s, Q=> , ET=> );IF NOT in AND ton1.PT = ton1.ET THEN TP1(IN:=FALSE);END_IF第二种：TP1(IN:= in OR TP1.Q, PT:=t#20s , Q=> , ET=> );第三种：TP1(IN:= in, PT:=t#20s , Q=> , ET=> );附梯形图：
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