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。
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