| 摘要 |
PROBLEM TO BE SOLVED: To conduct the time synchronization of a clock built in each of units 1-5 independently of an environment (transmission route, transmission speed, transmission system and complicatedness of processing) under which each unit is located in the monitor controller. SOLUTION: Each of units 1-5 needing clock information is provided with an FM receiver 11 receiving an FM radio wave including a time signal sent from a transmission source 10 at each correct time. Specific processing that might cause a delay in time synchronization processing such as long processing of an interrupt inhibit processing routine and access processing to a process file is inhibited till the time synchronization processing is finished in a prescribed time before the transmission of the time signal. Upon the receipt of the time signal from the transmission source 10, the time synchronization processing is executed based on the time signal. |
