施耐德140CRA93100C Quantum

140CRA93100C Quantum

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。

2 相异 PLC通常都有两个处理器，通常处理器是由两个不同厂家进行的提供，比如一个摩托罗拉，一个因特尔，同时进行解码和执行。这种差异性提供了失效检测的下列优点：

两个可执行码独自生成，编译的差异性使得在代码生成时，容易检测系统失效。

两个生成码由不同的处理器执行，因此，CPU能够在代码执行时，检测出系统失效和PLC的随机失效。

两个独立的存储器区用于两个处理器，因此，CPU能够检测出RAM的随机失效，而这在每个扫描周期的全部RAM检查时测不出来。

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