JPS60200661A - Resetting circuit of system alarm display - Google Patents

Abstract

PURPOSE:To bell off without stopping a bell regular time by resetting alarm display after detecting alarm when unmanned maintenance, and enabling to make alarm display when the alarm is detected again. CONSTITUTION:When a person in charge of maintenance is absent, such as in the night time, a key K is depressed to close the contact. A timer TIM is a circuit that generate output pulse, for instance, every one second, and transmits bell off signals to an alarm controlling circuit CONT through an OR gate G at an interval of one second by depressing the key K. Consequently, the alarm controlling circuit CONT stops an alarm bell BELL and a lighting lamp in an alarm display lamp DIS keeps the state of this time. The timer TIM generates output pulses every second and transmits a resetting signal. Accordingly, even when abnormalities take place twice in succession, this can be displayed when the interval of occurrence is longer than a second.

Description

Detailed Description of the Invention (a) 1. Technical Field of the Invention The present invention relates to a system alarm notification method, and in particular to a system alarm notification method that exhibits an effective function when night maintenance personnel are absent in a replacement system, etc. It is related to.

(b) Background of the Technology In an exchange system, each exchange has a built-in system monitoring device for monitoring the operating status of the exchange.

(C) Prior Art and Problems When a system monitoring device used in a switchboard encounters an abnormality in the switchboard to which it belongs, it displays the abnormality item and sounds an alarm bell to notify maintenance personnel. The maintenance staff learns of the occurrence of an abnormality through this alarm, looks at the displayed items, learns where the abnormality is, presses the bell-off button, and then takes countermeasures.

In the conventional system alarm display, once an alarm is detected, the bell-off operation causes the alarm to remain in place until the alarm is recognized, making it difficult to display it even if the next alarm occurs. Therefore, there is no way to know if the problem has occurred in the meantime, and there is a risk that countermeasures will be delayed and the abnormal situation will become even more serious.

Also, if there is no maintenance personnel at night, there is no maintenance personnel to stop the alarm bell, so the alarm bell will go off without ringing, which will put a huge load on the alarm bell. To prevent this, the bell off key should be placed on the alarm bell side. However, in this case, the bell would be constantly stopped, and there was a drawback that an alarm could occur due to an operational error or the like.

(d) Object of the invention The object of the invention is to eliminate the above-mentioned drawbacks of the prior art;
System alarm display that resets the alarm display after alarm detection even during unattended maintenance when no night maintenance personnel are present, allows the alarm display to be displayed even when an alarm is detected again, and allows the bell to be turned off without stopping the bell during normal operation. The purpose of the present invention is to provide a reliable circuit.

(e) 0 Structure of the Invention According to the present invention, the above-mentioned object is to provide a monitoring alarm display system for a switchboard, etc., which includes a timer circuit that periodically outputs pulses, a reset key, and means for calculating a logical sum. , a system alarm display reset/double circuit that uses the periodic output pulse of the timer circuit as a reset signal for alarm confirmation via the logical ORing means when the reset key is operating; This is achieved by providing

That is, according to the present invention, a periodic pulse signal for a hard clock is used in the system monitoring device, and when an alarm is detected, the display of the alarm is automatically reset by the 1 second pulse signal that follows the alarm signal. The alarm can be issued again when the next alarm is detected, and the alarm will no longer go off, which is very convenient when maintenance personnel are absent.

(f) 9 Embodiment of the Invention The figure is a schematic diagram showing an embodiment of a system alarm display reset circuit according to the present invention.

In the figure, ALM is an alarm detection circuit, C0NT is an alarm control circuit, TIM is a timer circuit, 5CAN is a bell-off key scanning circuit, K1 to Kn are help-off keys, K is an automatic reset key, DIS is an alarm indicator lamp, and BELL is an alarm bell. , G is an or gate.

The present invention will be described in detail below with reference to the drawings. When an abnormality occurrence signal is input from the exchange to the alarm detection circuit ALM, the alarm detection circuit ALM transmits this to the alarm control circuit C0NT, and the alarm control circuit C0NT lights up the lamp corresponding to the extension abnormality item on the alarm display lamp DIS. The alarm bell BELL did not ring.

A maintenance worker learns of the occurrence of an abnormal condition from the alarm bell BELL, sees the lit lamp among the alarm display lamps DIS, knows the abnormal item, and presses the corresponding bell off key among ~Kn.

The bell-off key scanning circuit 5CAN detects this and informs the alarm control circuit C0NT, and the alarm control circuit C0NT stops the alarm bell BELL and turns on the alarm display lamp I)I.
The lit lamp in s maintains its state.

The method described above is the same as the conventional method, but according to the present invention, when maintenance personnel are absent, such as at night, the electric key K is pressed to close its contacts. The timer TIM is a circuit that periodically generates an output pulse, for example, every 13 seconds, and when the electric key K is pressed, it transmits a bell-off signal to the alarm control circuit C0NT via the OR gate G at 1 second intervals. As a result, the alarm control circuit C0NT stops the alarm bell BELL, and the lit lamp in the alarm display lamp DIs maintains its current state.

Since the timer TIM generates an output pulse and sends a reset signal every second, even if an abnormality occurs twice in succession, this can be displayed if the interval between occurrences is longer than one second.

Effects of the fg1 invention As explained in detail above, according to the present invention, even when maintenance personnel are absent, the alarm can be reset at maximum 1 second after the occurrence of the alarm, and the second and subsequent alarms can be displayed in the latest state. Since the bell does not stop automatically, it has the great effect of preventing potential alarms due to operational errors, etc.

[Brief explanation of the drawing]

The figure is a schematic diagram illustrating one embodiment of a system alarm indicating circuit according to the present invention. In the figure, ALM is an alarm detection circuit, CO'NT is an alarm control circuit, TIM is a timer circuit, 5CAN is a bell-off key scanning circuit, K1 to Kn are help-off keys, 1K is an automatic reset key, DIS is an alarm display lamp, and BE
LL is an alarm bell, and G is an or gate.

Claims (1)

[Claims] A monitoring alarm display system for a switchboard, etc. is equipped with a timer circuit that periodically outputs pulses, a reset key, and means for calculating a logical sum, and when the reset key is operating, the logical sum is calculated. A reset signal for system alarm display, characterized in that the periodic output pulse of the timer circuit is used as a reset signal for alarm confirmation via means for taking.