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本文根据微机控制系统应用于生产过程，其环境恶劣，来自于外部干扰多的特点，提出了应用光电耦合器件实现开关量输入／输出，前向通道，后向通道等的隔离方法，并作了较详尽地讨论和说明。经在多项科研成果中应用，均取得了满意的效果。
According to the characteristics of microcomputer control system applied to the production process and its environment is harsh and comes from many external disturbances, this paper puts forward the isolation method that using the photoelectric coupling device to realize the switch input / output, forward channel, backward channel and so on Discuss and explain in more detail. After a number of scientific research applications, have achieved satisfactory results.