| 摘要 |
PURPOSE:To monitor a subordinated data station from another monitoring station when a monitoring station has a fault by providing a transmission line between data monitoring stations to transmit a stop signal for control signal transmission to a monitoring station from the other station. CONSTITUTION:A transmission line 10 is provided between data monitoring stations A and B. If the monitor control is impossible to data stations C and D subordinate to the station A owing to a fault of the station A, the station A transmits a request signal for monitor control of data C and D to a monitoring station B via the line 10. The station B receives the request signal and transmits a clock signal to the station A to discontinue transmission of the control signal to both stations C and D. Then the station B performs the data collection and the monitor control to the stations C and D through transmission lines 12 and 13. |
