An SOE(Sequence Of Event) implementing method of a monitoring/controlling system is provided to transmit SOE data used for recognizing a cause of an accident or analyzing a series of accident patterns in real time. A main controller(1) provides current time information to SOE cards(2) at every certain period to allow the SOE cards to have an accurate time. Whenever the SOE cards receive a time value inputted from the main controller, it re-sets a timer within a CPU and accumulatively calculates a time value by using an internal timer starting from the re-set time point. When an input of detect information is generated by a sensor of a field, the SOE cards recognize it, adds a time value received from the main controller and a time value calculated by itself, and provides the sensor input generation time to the main controller. The main controller can store and use real time data of the SOE cards provided always in real time with priority.
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