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A lot of equipment which controls in J-PARC accelerator composition machinery using PLC (Programmable Logic Controller) exists. The transmitting method to upper control systems, such as interlock information on accelerator composition apparatus, state changes information, and information on the right of control operation, is not performed by polling. The event notice function is used and it transmits to the upper control system. In the case of polling, information is transmitted to the upper control system to a number "msec" order. In the case where the event notice function is used, an event can be interrupted at the time of event generating, and information can be transmitted to a target to the upper control system at it. By the J-PARC control system, it makes it possible to transmit the information on state change (event) to the upper control system immediately from PLC by using the rudder sequence program which the rudder sequence program for apparatus control detected change of a state, and mounted the event notice by using this event notice function. The J-PARC control system which mounted the event notice function is reported.
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