摘要 |
PURPOSE:To perform efficiently control which needs to be performed at a high speed and control which need not be performed at a high speed by providing the 1st device which has a function for polling and the 2nd plural devices which have a function or receiving data supplied by its polling, and allowing the 1st device to perform the 1st polling successively to the 2nd devices at predetermined intervals of the 1st time and also the 2nd polling at predetermined intervals of the 2nd time. CONSTITUTION:The device 1 performs the 1st polling to a device 2 to supply data D for the low-speed control to the device 2. Then, the device 1 performs the 2nd polling to the devices 2 to supply data (d) for the high-speed control to the device 2. The device 1 performs the 2nd polling to a device 3 a time T2 after the start point of the 2nd polling to the device 2 to supply the data (d) for the high-speed control to the device 3. Further, the device 1 performs the 1st polling to the device 3 a timer T1(>T2) after the start point of the 1st polling to the device 2 to supply the data for the low-speed control to the device 3. Thus, this system completes the 2nd polling to the respective devices within a period T1 in which the 1st polling is carried out.
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