PLC的梯形图与传统的电气原理图非常相似，信号的输入/输出形式及控制功能基本上也是相同的；

它们的不同之处主要表现在：

控制逻辑——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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