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【单选题】
PLC在自动开关门控制系统。控制要求:当有人靠近自动门时,感应器接通(I0.0=1)执行开门程序(Q0.0控制开门动作,当碰到开门限位开关(I0.1=1)后停止。停2秒后(定时器T37计时)仍没有检测到有人(感应器没有接通),执行关门程序(Q0.1控制关门动作)。当关门限位开关接通(I0.2=1)停止时,回到初始状态。关于顺序功能图中转换条件或动作说法正确的是 。
A.
①是SM0.0
B.
①是SM0.1
C.
①是SM1.0
D.
①是SM4.5
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