摘要 |
The object of this invention is to provide a cooperation control system to make the system maintenance easier, and allow easier modification of the system. To achieve such object, a plurality of control devices according to this invention are divided into a plurality of sub-groups each of which cooperates with each other. The group object controls the sub-group. The plurality of control devices within the sub-group communicate with the group object and they are controlled by the group object.
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