| 摘要 |
PURPOSE:To calculate precisely the number of pulses in each unit time even if a part of input devices is failed or retrial due to a transmission error is executed by providing each input device with a clock circuit and an instantaneous pulse number operator respectively. CONSTITUTION:In respective input devices 41-4n, the instantaneous pulse number operators 51-5n calculate the number of pulses in each unit time by using clock values from the clock circuits 41-4n built in the input devices respectively. At the poling from an operation processor to the input devices 11-1n, each input device sends the counted value of its integration counter 3 to the device through a communication line 11 and also sends the operated result of its operator 5 to the device 12 through a communication line 13. Since the number of pulses in each unit time which are obtained by the input devices 11-1n is inputted to the device respectively, the correct number of pulses in each unit time can be obtained by the dvice 12 even if a part of the input devices is failed or retrial due to a transission error is executed. |
