描述
继电器控制是通过元件之间的硬接线来实现的，因此其控制功能就固定在线路中了，因此功能专一，不灵活；而PLC控制是通过软件编程来解决的，只要程序改变，功能可跟着改变，控制很灵活。又因PLC是通过循环扫描工作的，不存在继电器控制线路中的联锁与互锁电路，控制设计大大简化了。
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