Method for determining active/stand-by mode for use in a duplica

Details Method for determining active/stand-by mode for use in a duplica Method for determining active/stand-by mode for use in a duplica

1997-11-24

1999-04-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By presence or absence pulse detection

327141, 327142, G01R 1900

Patent

active

058960481

ABSTRACT:
An active/stand-by determination method for use in a duplicated system, wherein two elements, one given a priority and the other not given a priority, in the duplicated system operate in an active mode and a stand-by mode alternatively by using an X.sub.-- ACTIVE signal, a S.sub.-- ACTIVE signal, a STATUS signal for each element and a SIDE signal, the method comprising the steps of: a) setting both the elements in the stand-by mode upon power-on; b) checking the X.sub.-- ACTIVE signal and the STATUS signal at both the elements; c) entering into the active mode if it is determined at the step b) that both the X.sub.-- ACTIVE signal and the STATUS signal are "high"; d) remaining in the stand-by mode if it is determined at the step b) that at least one of the X.sub.-- ACTIVE signal and the STATUS signal is "low"; e) checking if both the elements are in the active mode; f) checking the SIDE signal if it is determined that both the elements are in the active mode at the step e); and g) moving an element given a priority into the stand-by mode if the SIDE signal is determined to be "low" at the step f).

REFERENCES:
patent: 3751685 (1973-08-01), Jaeger

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