JPH0116237Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm circuit having multiple alarm sources.

The alarm circuit generates an alarm output in response to an alarm generated by the alarm source, but in addition to this alarm output function, it also has a function to cancel the issued alarm and put it in a canceled state, and a function to wait for an alarm when the alarm source is restored normally. A function to restore the state is required. In a large system with a plurality of alarm sources, the design of an alarm circuit is not easy because a complicated situation arises in which the alarm sources generate alarms frequently or some of them return to normal.

A conventional alarm circuit will be explained with reference to FIGS. 1 and 2.

Hereinafter, the relay contact circuit that generates an alarm output will be referred to as an alarm output section, and the relay winding circuit that drives the relay contacts will be referred to as an alarm relay section. The circuit shown in FIG. 1 uses set/reset relays RL1-1 to RL1 to n as relays. This set
The S and R windings of reset relays RL1-1 to RL1 to n are independent differentiating circuits C ₁ R ₁ to _{C o}
The alarm sources _{a1 to} ao and a common reset signal source b are connected to each alarm source _a1 to _ao and a common reset signal source b via differentiating circuits _{R o} and _c1r1 to coro. For example, when an alarm occurs in alarm source _a1 , the signal passes through _c1 and enters the set winding S of relay RL1-1, where it is set. and the corresponding contacts
rl1-1 is closed and an alarm is issued from alarm output section _A1 . To cancel the alarm, operate the non-lock switch SW of reset signal source b, and set the reset signal to _c1.
It enters the reset winding R of the relay RL1-1 through the RL1-1, and its contact RL1-1 is opened.
In this circuit, the alarm output section enters a state of waiting for an alarm when the alarm is released. (b) Therefore, if the alarm issuance of alarm source a ₁ is canceled, an alarm will be issued if another alarm source a _o generates an alarm after that, and (b) also alarm source a ₁ will issue an alarm.
When normal recovery occurs, the charge in the capacitor _C1 is discharged by the resistor _R1 , so the alarm relay unit recovers, and both the alarm relay unit and the alarm output unit enter the alarm waiting state, and the alarm source is activated again. Even if a ₁ occurs, it will operate normally. (C) However, the disadvantage is that even if the alarm source is restored to normal before the alarm is generated and the alarm is released by the non-lock switch SW, the alarm output continues to be issued.
To stop this, it is necessary to separately operate the non-lock switch SW.

Next, the circuit shown in FIG. 2 does not use a set/reset relay, but uses two relays in the alarm relay part, and has contacts for each relay connected in series in the alarm output part. When an alarm is generated by the alarm source _a1 , the corresponding relay RL1-1 is operated, thereby closing the contacts rl1-1a and b. rl1-16 and rl2
-16 are both closed, so alarm output part A ₁
An alarm will be issued. To cancel the issuance of this alarm, operate the non-lock switch SW to operate the cancellation relays RL2-1 to RL2-n and open the contact rl2-1b of the alarm output section. To release the alarm, the alarm relay sections RL1-1a and RL2-1a are closed while the alarm from the alarm source _A1 is occurring, so the relay RL2-1 continues to operate, and the alarm output section It is continued by opening rl2-1b. (b) While the issuance of the above-mentioned alarm is being canceled, other alarm sources
Even when an alarm is generated from _ao , the contacts rl1- _nb of the alarm output section corresponding to the late alarm _ao close and issue an alarm. This is because the contact rl ₂ -1a of the alarm relay section is open, the relay RL2-n does not operate, and the contact rl ₂ -n _b of the alarm output section remains closed. (B)
In addition, if alarm source a ₁ is restored normally while the alarm generated from alarm source a ₁ is being canceled, relay RL1-
1 does not operate, contacts rl1-1a and rl1-1b are both opened, and both the alarm output section and the alarm relay section are in a state of waiting for an alarm, so even if an alarm is generated from the alarm source _a1 again, they will operate normally. (c) Furthermore, if an alarm is generated in alarm source _ao and the alarm source is restored to normal before the alarm issuance is canceled by the non-lock switch SW, relays RL1-n are automatically restored; The contacts rl1- _na and _rl1-1 - _nb open, the alarm issuance is automatically canceled, and the state returns to the alarm waiting state.

The circuit in Figure 2 is an alarm circuit that eliminates the drawbacks of the circuit in Figure 1, but if the number of alarm sources is n, the number of relays used in the alarm circuit is 2n, and the relay contacts Since there are as many as 4n pieces, there is a drawback that circuit implementation becomes complicated.

The purpose of this invention is to simplify the circuit implementation, and to ensure that (a) if an alarm is generated from another alarm source while the advance warning is being canceled, (b) the alarm is restored normally while the warning is being cancelled. (c) To provide an alarm circuit that allows appropriate responses to be taken when the alarm source is restored to normal before the alarm is released.

The alarm circuit according to the present invention includes an alarm relay section and an alarm output section for each of a plurality of alarm sources each having a first and second output terminal that outputs an alarm occurrence and a normal state as an output signal. The relay section has a set winding connected to the first output terminal of each alarm source via a differential circuit, and the other end of a diode connected to the second output terminal of each alarm source and a common reset source. It is characterized in that it is comprised of a set/reset relay having a reset winding connected through a differential circuit, and that the alarm output section is comprised of contacts that are opened and closed by the set/reset relay.

The present invention will be explained in detail below with reference to the drawings.

FIG. 3 is a circuit diagram showing an embodiment of the present invention. Alarm sources a ₁ to a _o have two output terminals 1 and 2, output terminal 1 outputs an alarm generation, and output terminal 2 outputs a normal state as an output signal. Setting of each alarm relay section
The set windings S of the reset relays RL1-1 to RL1-n are connected to the output terminals 1 of _the respective alarm sources _a1 to ao via _{differentiating circuits C1R1 to CoRo .} On the other hand, the set winding R is connected to the output terminal 2 and the reset source b.
are connected to diodes RC1 to RC _o connected to each other via differentiating circuits c ₁ r ₁ to _{c o} r _o . Each alarm output section consists of contacts rl _1-1 to _{rl 1-o that} are opened and closed by a set/reset relay.

The operation of this alarm circuit is such that, for example, when an alarm is generated from alarm source _a1 , a signal passes through _c1 and enters the set winding S of set/reset relay RL1-1 and is set. Corresponding contact rl _1-1 closes, alarm output part
A warning is issued from _A1 . To cancel the warning,
Operate the non-lock switch SW of reset signal source b, and the reset signal passes through diode RC1 and differential circuit _c1 to set/reset relay RL1-1.
The reset winding R is entered and contact rl _1-1 is opened. In this circuit, (a) advance alarm, e.g. alarm source a ₁
If an alarm is generated from another alarm source a _o while the alarm is being released, the alarm will be emitted from the corresponding alarm output unit A _o . (b) For example, when an alarm is generated for alarm source a ₁ and the alarm source a ₁ is restored to normal while the alarm is being released, the capacitor c ₁ of the differentiating circuit is discharged by the resistor R ₁ and the alarm source a ₁ is activated again. When an alarm is generated, the alarm is also output from the alarm output section _A1 . (c) Further, for example, when an alarm is generated from alarm source a ₁ , the alarm output section
If an alarm is generated from A ₁ and the alarm source is restored to normal before the alarm is released, the signal from output terminal 2 of the alarm source will be transferred to the capacitor of the differentiator circuit.
Enters the reset winding R through c ₁ and contacts rl1-1
to return to the alarm standby state. Unlike the circuit shown in Figure 1, there is no need to go to the trouble of operating the non-lock switch SW.

As explained above, the alarm circuit according to the present invention, when an alarm is generated from another alarm source while the advanced alarm is being released, issues the alarm from the corresponding alarm output section, and Even if the alarm source is restored normally but an alarm occurs again, the alarm is issued again, and if the alarm source is restored normally before the oscillation of the alarm is canceled, the alarm waiting state is automatically returned. Moreover, the number of set/reset relays and contacts used in this circuit is only one for each alarm source, so the circuit implementation is simple.

[Brief explanation of the drawing]

1 and 2 are circuit diagrams showing a conventional example, and FIG. 3 is a circuit diagram showing an embodiment of the present invention. a ₁ , ~a _o ... Alarm source, A ₁ ~ _{A o} ... Alarm output section,
B ₁ ~ B _o ... Alarm relay section, RL1-1 ~ RL1-
n...Set/reset relay, rl _1-1 ~ _{rl 1-o} ...
...Set/reset relay contact, C ₁ R ₁ ~ C _o R _o ,
r ₁ r ₁ ~ c _o r _o …… Differential circuit capacitor, resistor,
RC ₁ to RC _o ...Diode, b...Reset signal source, SW...Non-lock switch.

Claims (1)

[Scope of utility model registration request] In an alarm circuit comprising an alarm relay section and an alarm output section, each of which corresponds to a plurality of alarm sources each having a first and second output terminal that outputs an alarm occurrence and a normal state as an output signal, the alarm relay section comprises: A set winding is connected to the first output terminal of each alarm source via a differentiating circuit, and a differentiating circuit is connected to the other end of the diode, which is connected to the second output terminal of each alarm source and the common reset source. 1. An alarm circuit comprising a set/reset relay having a reset winding connected through the set/reset relay, and wherein the alarm output section comprises a contact opened/closed by the set/reset relay.