The distributed control system (1) stores a plurality of control devices (11, 12, 20) and data output from each control device (11, 12, 20) shared by the control devices (11, 12, 20). A process IO master device (31) including an output data memory (50) having a storage area and an output authority table (60), and a sensor / actuator (200 to 210) connected to the process IO master device (31). The output authority table (60) is provided with a plurality of connected process IO modules (100 to 110), and which output data of which control device (11, 12, 20) is to be adopted for each address corresponding to the actuator. Grant the authority to make decisions.
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