描述
继电器控制逻辑采用硬接线逻辑，利用继电器机械触点的串联或并联，及时间继电器等组合成控制逻辑，其接线多而复杂、体积大、功耗大、故障率高，灵活性和扩展性很差。而PLC采用存储器逻辑，其控制逻辑以程序方式存储在内存中，灵活性和扩展性都很好。
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