| 摘要 |
PURPOSE:To preclude such an unstable phenomenon that switching enters a seesaw state by providing a switch with a manual switch for stand-by system specification and specifying one computer as a stand-by system previously. CONSTITUTION:When a computer 1 is specified as the stand-by system with the stand-by system specification switch of the switch 7 and a computer 2 detects trouble of the computer 1, an H-level trouble detection signal is supplied to an FF 50 through an AND gate 48 which is opened through a switch 42 and also to an alarm device 56 through an OR circuit 52 at the same time. Then, an output signal changeover switch 54 is switched through a relay 53 with the output of the FF 50 and the computer 2 is switched to the computer 1 in the stand-by state. In this state, the wrong trouble detection output of the computer 2 is nullified substantially by closing an AND gate 49 by the switch 42, etc., to preclude the unstable phenomenon wherein the computer switching enters the seesaw state. |
