PY0A050A
OF70SC100D
JANCD-MIF06
CIMR-V7CU40P74
（3）可编程控制器有监视定时器等自检功能，检查出异常时，输出全部关闭。但当可编程控制器CPU故障时就不能控制输出，因此，对于能使用户造成伤害的危险负载，为确保设备在状态下运行，需设计外电路加以防护。
CPU按照PLC内系统程序赋予的功能指挥PLC控制系统完成各项工作任务。
（2）PLC系统中干扰的主要来源及途径
传统的电器图，一般包括电器原理图、电器布置图及电器安装图。在PLC控制系统中，这一部分图可以统称为“硬件图”。它在传统电器图的基础上增加了PLC部分，因此在电器原理图中应增加PLC的I/O连接图。此外，在PLC控制系统的电器图中还应包括程序图（梯形图），可以称它为“软件图”。向用户提供“软件图”，可便于用户发生发展或工艺进时修改程序，并有利于用户在维修时分析和排除故障。根据具体任务，上述内容可适当调整。
此外，在I/O模块的安装时，根据不同的系统，通常同型号的模块放置在一起。但是，。如果对于输出模块与输入模块形成回路的，则可以将一个回路的参量所涉及的模块放置在一个机架上（或一个CPU所控制的机架上）比较合理。有的在设计的时候不会考虑这一点，你可以调整过来。
原路图可水平布置，也可垂直布置。水平布置时，电源电路垂直画，其他电路水平画，控制电路中的耗能元件（如接触器和断电器的线圈、信号灯、照明灯等）要画在电路的最右方。垂直布置时，电源电路水平画，其他电路垂直画，控制电路中的耗能元件要画在电路的最下方。
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