| 摘要 |
PURPOSE:To prevent a system from being stopped completely even if a failure takes place in one of buses at a transmission/reception board side by constituting the entire system of two sytems, and forming a bus of a control board side and a bus of a transmission/reception board side to be separated. CONSTITUTION:One of control boards CONT1 and 2 is selected by the operation of an operating panel OP. In using the control board CONT 1 as an active system, changeover devices SW-1A, SW-2A, SW-1B and SW-2B are respectively connected, disconnected, connected and disconnected by a signal on signal lines l1 and l2, and transmission/reception boards TR1-TRn make communication with the control board CONT1 via buses BUS-A and BUS-B. In this case, if one of the buses BUS-A and BUS-B is failed, a failed bus is disconnected and the communication is continued. |
