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随着自动化技术和计算机技术的不断发展,工控机也就更广泛的得到应用.现场总线技术的引入,减少了现场布线,增强了工控机与现场设备的信息交往.“,”Following the development of the automation technology and the computer technology , the industrial control computer will be more wide－ range applied. Fieldbus technology are introduced,and the field wire will be decreased.The change will be increase for the information between the industrial control computer with field device.