GE发那科A16B-2201-0103

A16B-2201-0103

A16B-2201-0103

作为家族的重要环节，PLC已经越来越多的被人们所认知，但是在使用的过程中，仍然有很多使用者困惑，为什么一套和以往使用类似的PLC被冠以PLC，PLC和普通PLC到底有哪几方面的区别，在此和大家进行分享。   众所周知，设计的理念我们要记住三个词：冗余、相异、自检测。而只有实现了以上三个理念设计的产品，我们才能认为它是产品，而普通的PLC产品是不具备的设计。那接下来我们就看看PLC是如何通过设计实现这三个理念的。

1 冗余 普通PLC内部CPU数量有一个或者多个，但程序通常是进行一个处理，多个CPU的功能是把程序中的逻辑运算、算数运算、通讯功能等分担实现，也就是协作处理。 PLC内部CPU数量至少两个或者多个，两个CPU的功能是：分别对同一个程序各执行一次，然后把记过放在一起比较，如果结果一致，就会进行输出，如果不一致，则选择的结果输出（通常意义上的不输出或者停机）

因此只有具备冗余设计的CPU才能称之为PLC。除此之外，PLC中的CPU的检测具有时钟检测、监视时钟、序列检查、存储器检查。   时钟测量:在处理器电路中，有两个不同的振荡器交叉检查它们的行为，每个处理器使用一个时钟检查另外一个是否运行。如果在一个确定的周期里，检测到对方没有运行，CPU就会进入状态。固件每秒钟会检查两个振荡器的精度。 监视时钟：一个硬件和一个固件的监视时钟检查PLC的活动和执行用户逻辑的执行时间。这和常规的PLC系统是相同的。 序列检查：序列检查监视CPU操作系统不同部分的执行。 存储器检查：所有静态存储器区，包括Flash存储器和RAM，使用循环冗余码（CRC）进行检测，并且双码执行。动态存储器区由双码执行保护，周期性进行检测。在冷启动时，这些检测重新进行初始化。 从上面的分析可以看出，PLC的诊断和检测比常规的PLC的检测要多很多，所以相对来说，硬件和软件的设计更复杂。当然，检测和诊断的范围也更广范，更细致。

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