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。
在选型的时候，因为各种PLC都有大型、中型、小型的分别，这些分别主要是由
CPU模块的性能不同造成的。在实际上，并非一定大型的功能就是合适的。除了价格方面
的考量之外，主要是，如果控制点数不多，小型的CPU模块完全可以胜任，则小型的CPU反
而比大型的CPU模块工作还要可靠一些。因为，小型的CPU所涉及的资源少，而大型CPU的资
源多，在程序执行中，为处理那些程序不需用到的资源时，也要分配时间去处理，这样不仅
造成资源的浪费，可能在程序处理上不及小型CPU可以更单纯和稳定地工作。
在设计交底的过程中要指出的是，对于设计中的任何变更，你只能提建议，而不是
擅自做修改。因为，你的职责是按照设计施工，而不是设计，因此，对于任何你发现的不合
理的东西，你可以提出意见，但必须要等到设计变更确认书下到你手里后，你才能按照变更
后的设计工作，尽管这个变更可能是你的意见。还有，即使最初的设计也是你做的，你在
变更后，也要通知客户，并取得客户的书面同意。
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