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US4570215A Input/output device for programmable controller 失效
可编程控制器的输入/输出装置

Input/output device for programmable controller
摘要:
An input/output device for a programmable controller provided separately from said device capable of performing the bidirectional transmission such as taking in the input data and sending out the output data only by connecting the main unit of said controller to said input/output device or devices with two systems of signal line consisting of a serial data conductor and a clock signal conductor.
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