| 摘要 |
PURPOSE:To decrease the maintenance time by transmitting a reset signal to a terminal station placed remotely from a central station to reset a holding circuit of an error display lamp. CONSTITUTION:A contact 22 is closed in the inside of a terminal station 3 installed at a field through a transient fault, a relay 21 is operated and this relay gives an alarm displya to the inside of the terminal station 3 and alarm display in the central station 2. Furthermore, when this relay 21 is actuated, a contact 25 for self-retaining is closed, and even when the fault in the terminal station 3 is restored, the alarm display is continued. When a contact of a switch in the inside of the central station 2 is closed, a reset signal is fetched to a terminal station 1 installed to a central control room and it is transmitted to the terminal station 3 installed at the field as data. The transmitted reset signal actuates a relay 20 by a final output contact 19 of a summing point 12. When the relay contact 26 is opened, it is operated in the same way as in a reset switch 23 and the reset is attained. |
