描述
并联输出通断状态完全相同的负载，可以并联后共用PLC的一个输出点（要考虑PLC输出点的负载驱动能力）。例如PLC控制的交通信灯，对应方向（东与西对应、南与北对应）的灯通断规律完全相同，将对应的灯并联后可以节省一半的输出点。
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