根據控制系統的要求確定所需要的I/O點數時，應再增加 10%～20%的備用量，以便隨時增加控制功能。MOTION CONTROL 777978-VM MOTION CONTROL 777978-VM MOTION CONTROL 777978-VM對于一個控制對象，由于采用的控制方法不同或編程水平不同，I/O點數也應有所不同。表2列出了典型傳動設備及常用電氣元件所需的開關量的I/O點數。

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