描述
对于单机装置，PLC系统是理想选择。当工厂配置多个PLC系统时，就会产生相互连接的要求。这一般很难实现，因为通常需要利用通信协议对数据进行映射。集成当然没有问题，但当有变更需求时，那用户的麻烦就来了：一旦某个PLC系统做了变更，就可能会导致两个PLC不能正常通讯，这是因为数据映射受到影响的缘故。对DCS系统而言，则根本不需要映射，配置变更只是一个简单的过程；控制器是系统自带的。
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