Patent Number: 060382775
Section: claims

1. A plant operation apparatus for maintaining plant safety when a single device fails or when a single operating error occurs, the apparatus comprising: a plurality of trains of safety equipment independent in operation and physically separate from each other;  an operation panel, including touch-operated panel switches, for generating an operation signal based on actuation of the touch-operated switches, and for outputting the operation signal, the operation panel including a display;  an operation display screen control device for controlling the display and for selecting a first train of the plurality of trains based on a software selection function according to the operation signal from the operation panel, and for generating a first control signal for selecting the first train;  a selection device comprising a plurality of push buttons respectively corresponding to the plurality of trains, for when a first push button of the plurality of push buttons is activated, generating a second control signal for selecting a train corresponding to the first push button and for resetting remaining push buttons other than the first push button, thereby preventing the output of control signals from the selection device to trains other than the train corresponding to the first push button; and  a train control device receiving the first control signal output from the operation display screen control device and the second control signal output from the selection device, for generating a third control signal for a selected train based on both the first control signal and the second control signal, and for outputting the third control signal to the selected train.  a display device for displaying operation information including train selection states simultaneously to a plurality of operators; and  a computer for controlling display of the operation information on the display device, the display device being simultaneously viewable by a plurality of operators performing train selection to prevent mis-operation by the plurality of operators.  a display device for displaying operation information including train selection states simultaneously to a plurality of operators; and  a computer for controlling display of the operation information on the display device, the display device being simultaneously viewable by a plurality of operators performing train selection to prevent mis-operation by the plurality of operators.  a display device for displaying operation information including train selection states simultaneously to a plurality of operators; and  a computer for controlling display of the operation information on the display device, the display device being simultaneously viewable by a plurality of operators performing train selection to prevent mis-operation by the plurality of operators.  train pilot lamps for indicating train selection state based on train selection information output from the operation display screen control device; and  control train pilot lamps for indicating train selection state based on train selection information output from the selection device, whereby mis-operation in selecting a target train while seeing the train pilot lamp corresponding to the selected train lighted is prevented.  train pilot lamps for indicating train selection state based on train selection information output from the operation display screen control device; and  control train pilot lamps for indicating train selection state based on train selection information output from the selection device, whereby mis-operation in selecting a target train while seeing the train pilot lamp corresponding to the selected train lighted is prevented.  train pilot lamps for indicating train selection state based on train selection information output from the operation display screen control device; and  control train pilot lamps for indicating train selection state based on train selection information output from the selection device, whereby mis-operation in selecting a target train while seeing the train pilot lamp corresponding to the selected train lighted is prevented. 2. The plant operation apparatus as claimed in claim 1, wherein the selection device comprises a plurality of self diagnosis circuits, each of the self diagnosis circuits corresponding to a respective train, the selection device resetting the self diagnosis circuits based on a software logic function corresponding to the push buttons for trains not selected when an operator pushes one of the push buttons to select one train. 3. The plant operation apparatus as claimed in claim 2, wherein the selection device further comprises isolators corresponding to each train. 4. The plant operation apparatus as claimed in claim 1, wherein the push buttons in the selection device are mechanically reset push buttons, and the mechanically reset push buttons corresponding to trains that are not selected are reset mechanically when a train is selected. 5. The plant operation apparatus as claimed in claim 1, wherein the push buttons in the selection device are alternate push buttons, and one alternate push button corresponding to a train to be selected is pushed after alternate push buttons corresponding to other trains that are not selected are reset manually. 6. The plant operation apparatus as claimed in claim 1, wherein the selection device comprises a module switch having a plurality of channels, and the module switch is formed so that only one channel corresponding to one train is selected. 7. The plant operation apparatus as claimed in claim 1, wherein the selection device comprises a mechanical gear switch movable to a plurality of positions so that only one channel corresponding to one train is selected for each of the positions. 8. The plant operation apparatus as claimed in claim 7, wherein the mechanical gear switch incorporated in the selection device maintains a neutral position when no train is selected. 9. The plant operation apparatus as claimed in claim 1, further comprising: 10. The plant operation apparatus as claimed in claim 2, further comprising: 11. The plant operation apparatus as claimed in claim 3, further comprising: 12. The plant operation apparatus as claimed in claim 1, further comprising: 13. The plant operation apparatus as claimed in claim 2, further comprising: 14. The plant operation apparatus as claimed in claim 3, further comprising: 15. The plant operation apparatus as claimed in claim 1, wherein the operation display screen device controls display of a flow diagram of a plant system displayed on the operation panel so that a selection state of a target plant device to be operated in the selected train is displayed near the target plant device on the flow diagram to prevent a mis-operation caused by an operator. 16. The plant operation apparatus as claimed in claim 2, wherein the operation display screen device controls display of a flow diagram of a plant system displayed on the operation panel so that a selection state of a target plant device to be operated in the selected train is displayed near the target plant device on the flow diagram to prevent a mis-operation caused by an operator. 17. The plant operation apparatus as claimed in claim 2, wherein the selection device comprises a logic circuit for preventing generation and output of the selection signal when a mis-operation caused when push buttons corresponding to trains not selected are pushed. 18. The plant operation apparatus as claimed in claim 5, wherein the selection device comprises a logic circuit for preventing generation and output of the selection signal when a mis-operation caused when push buttons corresponding to trains not selected are pushed. 19. The plant operation apparatus as claimed in claim 1, wherein the operation display screen control device includes train identification table used for obtaining information concerning a train to be selected based on target device to be operated and operation contents included in the operation signal transferred from the operation panel, and the operation display screen control device selects a train based on the information in the train identification table. 20. The plant operation apparatus as claimed in claim 1, wherein the train control device includes train identification table used for obtaining information concerning a train to be selected based on a target device to be operated and operation contents included in the control signal transferred from the operation display screen control device, and the train control device selects a train based on the information in the train identification table.