| 摘要 |
PURPOSE:To simplify the attachment/detachment of loop controllers to and from an on-line system by connecting the loop controllers with a common memory through serial data lines. CONSTITUTION:Loop controllers 10- are connected to an upper controller, a common memory 30, through respective serial transmission lines 20- independently. A data operation processing part 11 and a parallel/serial converting circuit 12 are built in each loop controller 10-. A common memory 30 makes it possible, if necessary, to execute the operation between respective loop controllers 10- through respective operation processing parts 11 in addition to the operation of individual loop controllers 10- or makes it possible to freely use an upper central operation processing part 41 for various operations and an upper transmitting controller 42. |
