| 摘要 |
PURPOSE:To improve the diagnostic function and the efficiency of the locating work or the like, by demarcating automatically faults in paths and parts when faults concerning channel status words are searched. CONSTITUTION:A channel status word CSW turning-back control data signal transmitted from a central controller 1 to a common bus 4 is taken into a peripheral controller 3 and is recognized and is stored in a storage area B for CSW original data of a buffer memory 3e. Simultaneously, this signal is transferred and written onto a specific area A for storage of CSW of a main storage device 2 and is stored in a storage area C for CSW read data of the buffer memory 3e, and write data in the area B and read data in the area C are compared and discriminated autonomously, and the result is reported to the central controller 1 through a status controlling part 3a. |
