PLC的通讯包含主机与长途I/O接口之间的通讯、多台PLC之间的通讯、PLC与其它智能操控设备之间的通讯。PLC与其它智能操控设备一同,能够构成“集中办理、涣散操控”的分布式操控体系。有必要指出,并不是一切的PLC都有上述悉数功用,有些小型PLC只要上述的有些功用,可是报价较低。
如图5-10所示为定时时间为1h的梯形图及时序图,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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