IC200CBL001 一般講，根據實際的I/O點數，凡落在上述不同范圍者，選用相應的機型，性能價格比必然要高；相反，肯定要差些。
自然，也有特殊情況。如控制點數不是非常之多，不是非用大型機不可，但因大型機的特殊控制單元多，可進行熱備配置，因而采用了大型機。
PLC可分為箱體式及模塊式兩大類。微型機、小型機多為箱體式的，但從發展趨勢看，小型機也逐漸發展成模塊式的了。
IC200CBL001模塊式的PLC是按功能分成若干模塊，如CPU模塊、輸入模塊、輸出模塊、電源模塊等等。大型機的模塊功能更單一一些，因而模塊的種類也相對多些。這也可說是趨勢。目前一些中型機，其模塊的功能也趨于單一，種類也在增鄉。
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