| 摘要 |
PURPOSE:To send and receive easily and also at a low cost the up-and-down on-line information to and from a control object, by constituting the titled processor of plural computers, and an information input/output device for sending and receiving the on-line information to and from the control object, and a shared memory device for sending and receiving directly the information which is held in common among the computers, to and from the information input/output device. CONSTITUTION:An information input/output device 3 writes up-on-line information from a control object, in the area concerned on a shared memory device 1 in order that information can be sent and received directly to and from a storage device. In such a case, the shared memory device 1 interlocks a fact that computers 2a-2n executes an access to the same area as the previous area, and protects the information concerned. Accordingly, when the up-on-line information is required, the computers 2a-2n can obtain easily the same up-on-line information by only reading out the area concerned on the shared memory device 1. Also, as for down-on-line information to the control object, by only writing the area concerned of the shared memory device 1 by each computer 2a-2n, the information input/output device 3 reads out the information on the shared memory device 1 and sends out the information to the control object.
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