| 摘要 |
PROBLEM TO BE SOLVED: To deliver and receive data by reducing the number of communication channels at a low cost and freely externally commanding a controller. SOLUTION: A communication control system comprises the step of time dividing transmitting/receiving data to be transmitted/received between a controller 1, a controller 2 and a monitor 3 at a time in response to a necessary communication frequency between the controller 1, the controller 2 and the monitor 3.
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