FF现场总线是符合IEC61158标准的总线，侧重于过程控制自动化领域。
FF is accorded with the IEC61158 standard, it lays on the automation field of process control.
通用串行总线(usb)是目前PC外设接口的主流总线标准，并迅速在工业自动化仪器仪表中得到应用。
USB (Universal Serial bus) is a mainstream bus standard of PC peripheral interface, which extends its applications to industrial automatic instruments.
最初是为了满足离散制造工业需求而开发的PROFIBUS，目前已经演化成离散制造和流程自动化的现场总线标准。
Originally developed to meet the needs of the discrete manufacturing industry, PROFIBUS has evolved into a fieldbus standard for both discrete manufacturing and process automation.
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