描述
辅助继电器M1用于定时启停控制，采用两个0.1s定时器T14和T15串级使用。当T14开始定时后，经1800s延时，T14的常开触点闭合，使T15再开始定时，又经1800s的延时，T15的常开触点闭合，Y4线圈接通。从X14接通，到Y4输出，其延时时间为1800s+1800s=3600s=1h。
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