E1401b

描述

E1401b

可编程序控制系统在硬件和软件上的预置，有运行检测的关键监视条件

可编程序控制系统配置了彩色图形工作站/屏幕监视，但从价格及反映现场状态的时间来看，屏幕监视尚不方便。关键的故障，或者在关键的机械设备附近，可配置一些指示灯，它们可以用数字量输出做成，用来监视程序的正常运行，或用来调试程序，在指示灯旁配以功能标牌，可帮助操作人员确认可编程序控制系统的正常运行和及时反映故障。

设计大中型可编程序控制系统时不要耗尽它的硬件和软件资源

对于设计的新系统，硬件上至少要保留15%左右的冗余，在软件编制时，同样要估计用户软件对计算机资源的需要与用量。尤其对中间继电器，计数器/定时器的使用，要留有余地。因为在调试和运行后，软件总会被修改、补充，甚至重新编制。已编制的软件让人无法修改和完善，在工程上是不实际的。

合理地配置可编程序控制器系统的冗余

可编程序控制系统可能做出多种方式的冗余，中央处理器的双机热备、冷备冗余是常见的方式。另外，双系统冗余，即中央处理器和全部的输入、输出、组网通信完全冗余，其价格和实用性虽然在许多工程项目中难以被人接受，但在有毒、有害的化工生产环境这种冗余很有必要。在设计系统中，要使配置冗余方式较为经济而又实用，力求使故障缩小在本设备身上。不要因某一设备发生故障，引起工艺流程中相关设备运行或状态受到冲击。

以上阐述的几个方面，是在可编程序控制系统总体方案设计时，要格外重视的问题，只有在设计系统时，考虑周到，系统投入运行之后，设计人员才能少些遗憾。

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