JP3348688B2 - Unwanted alarm suppression circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unnecessary alarm suppressing circuit for preventing an unnecessary failure alarm from being generated even when an electronic circuit package is mounted on an operating apparatus body.

[0002]

2. Description of the Related Art In a transmission apparatus and the like, a plurality of electronic circuit packages each including a printed circuit board are mounted on a connector of a transmission apparatus body. Each of these electronic circuit packages is provided with a failure detection circuit that detects a failure occurring in the package and outputs an alarm signal. The electronic circuit package is divided into a subordinate package and a control package, and an alarm signal output from the subordinate package failure detection circuit is collected in the control package via the connector, and the control package has its own failure detection circuit and subordinate package. When any one of the package failure detection circuits outputs an alarm signal, the relay is controlled to output an alarm signal to the outside.

[0003] When a transmission device is maintained or a failure occurs, a related electronic circuit package is removed from the device main body, and necessary inspection, adjustment, or repair is performed. After the inspection and adjustment are performed, the electronic circuit package is returned to the apparatus main body. At this time, the electronic circuit package is usually connected to the connector of the apparatus main body while the power is turned on and operating. Attached to.

However, in the above-mentioned control package and the like, the output voltage of its own power supply does not immediately become the original voltage even if the power supply is supplied to the above-mentioned power supply by being attached to the connector of the apparatus main body, and the output voltage becomes a specified value. It takes a certain amount of time to climb up. During this time, the power supply voltage required for normal operation is not supplied to the relays and the failure detection circuit on the control package. May erroneously send out an alarm signal.

Therefore, conventionally, the control package is divided into, for example, first and second control package packages,
The first control package is configured to output an alarm signal via the second control package, while the second control package is configured to output an alarm signal under the control of the first control package. Was adopted. In this method, if the first control package is first mounted on the main body of the apparatus, and then the second control package is mounted, the first control package may erroneously generate an alarm signal when the first control package is mounted. Is generated, no alarm signal is sent to the outside because the second control package is not mounted. After that, when the second control package is mounted, the first control package is in its original operating state and can correctly control the first control package.
If an alarm signal is generated by mistake in the second control package, it can be prevented from being transmitted.

[0006]

However, in this method, the control package has to be constituted by two printed circuit boards, which causes an increase in the cost and size of the transmission device. The present invention has been made to solve such a problem, and an object of the present invention is to prevent an unnecessary failure alarm from being generated even if an electronic circuit package is mounted on an operating apparatus body without dividing a control package. An object of the present invention is to provide an unnecessary alarm suppression circuit.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of subordinate packages each provided with a first failure detection circuit for detecting a failure and outputting an alarm signal; And a control package detachably mounted on the apparatus main body via a connector, wherein the control package includes first and second terminals, respectively. First equipped
And a second relay, wherein the first relay electrically connects the first and second terminals to each other when an alarm signal is supplied from the first failure detection circuit via the connector, The second relay conducts the first and second terminals to each other when an alarm signal is supplied from the second failure detection circuit, and the second terminals of the first and second relays are connected together. In a device connected to an alarm output terminal of the control package, a circuit provided in the control package to suppress unnecessary alarms generated when the control package is attached to the connector, wherein the first and the second circuits are provided. A third relay including a second terminal, wherein the first terminal is connected to a reference potential point, and the second terminal is connected to the first terminal of the first and second relays; A certain time After There has elapsed, characterized in that a relay control circuit for turning said third of said first and second terminals of the relay to each other.

In the unnecessary alarm suppression circuit according to the present invention, the relay control circuit controls the third relay, and after a certain time has elapsed since the power was supplied, the first and second terminals of the third relay are connected. Mutual conduction. Thereafter, the first terminals of the first and second relays are connected to the reference potential point via the third relay, and when the first and second failure detection circuits output an alarm signal, the first and second relays are output. The first and second terminals of the second relay are turned on, and the alarm output terminal is set to the potential of the reference potential point, and an alarm signal is sent to the outside.

That is, in the unnecessary alarm suppression circuit according to the present invention, even if the control package is mounted on the apparatus main body while the apparatus main body is operating, each part of the control package is supposed to have a predetermined time after mounting. Until the operation state of
The first and second terminals of the first relay and the second relay are not conductive, so that even if the first and second terminals of the first and second relays are erroneously conductive, an alarm signal is output to the outside through the alarm output terminal. It will not be sent. Then, when the unnecessary alarm suppressing circuit of the present invention is used, it is not necessary to divide the control package as in the conventional case, so that the problems of cost increase and size increase of the device can be solved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of an unnecessary alarm suppressing circuit according to the present invention, and FIG. 2 is a schematic block diagram showing a configuration of a transmission device equipped with the unnecessary alarm suppressing circuit. As shown in FIG. 2, the transmission device 2 incorporating the unnecessary alarm suppression circuit of the embodiment includes a plurality of subordinate packages each including a first failure detection circuit for detecting a failure and outputting an alarm signal. And a control package 6 which is provided with a second failure detection circuit for detecting a failure and outputting an alarm signal, and which is detachably attached to the apparatus body via a connector (not shown).

An operation terminal device 8 including a display device and a keyboard, and an alarm device 10 including an alarm lamp and an alarm buzzer are connected to the outside of the transmission device 2.
Sends a warning signal 12 to the operation terminal device 8 and a warning signal 14 to the warning device 10 when a failure occurs.
Is sent. The alarm signal 12 is a TTL level signal, which is always a ground (reference potential point) level voltage, but has a voltage of about 5 V when a failure occurs. On the other hand, the alarm signal 14 is normally at about -48 V, and at the time of occurrence of a failure, is at the ground level. And the operation terminal device 8
When the alarm signal 12 is input, for example, a message notifying that a failure has occurred in the display device is displayed, while the alarm device 10 turns on the alarm lamp and sounds the alarm buzzer when the alarm signal 14 is input.

As shown in FIG. 1, each subordinate package 4
Is equipped with a first failure detection circuit 16 and performs an CRC check on transmission data to detect an abnormality.
A high-level alarm signal 18 is output. This signal is inverted by an inverter 20 to a low level, and supplied to the control package 6 via a connector (not shown). Further, the control package 6 is provided with a second failure detection circuit 22, which outputs a high-level alarm signal 24 when an abnormality is detected by performing a CRC check of the transmission data or the like.

The control package 6 also has first and second relays 30, 32 with first and second terminals 26, 28, respectively. The first relay 30 outputs an alarm signal 1 from the first failure detection circuit 16 through a connector.
When 8 is supplied, the first and second terminals 26 and 28 are made conductive to each other. On the other hand, the second relay 32 outputs the alarm signal 2 from the second failure detection circuit 22 via the inverter 34.
When 4 is supplied, the first and second terminals 26 and 28 are made conductive to each other. And the first and second relays 3
The second terminals 28 of 0 and 32 are both connected to the alarm output terminal 36.

Further, the control package 6 includes first and second terminals 26 and 28, the first terminal 26 is connected to the ground, and the second terminal 28 is connected to the first and second relays 3.
The third relay 3 connected to the first terminals 26 of the
8, after a certain period of time has passed since the power was supplied,
And a relay control circuit 40 for electrically connecting the first and second terminals 26 and 28 of the relay 38 to each other. The unnecessary alarm suppression circuit 3 according to the embodiment includes a third relay 38 and a relay control circuit 40. In FIG. 1, only the first relay 30 is shown as the first relay in order to prevent the drawing from becoming unnecessarily complicated. However, the first relay is actually provided for each of the other three subordinate packages 4. Is provided and connected in parallel to the first relay 30,
Each of the subordinate packages 4 operates in the same manner as the illustrated first relay 30 by an alarm signal from the first failure detection circuit.

The control package 6 operates by being supplied with power from a first power supply (not shown) provided in the main body of the transmission apparatus 2 and operates to supply power to each circuit on the control package 6. It has. The output voltage of the first power supply is about -48 V in the present embodiment, and
The output voltage of No. 2 is about 5V. The alarm output terminal 36
Is connected to the first power supply through a resistor (not shown) outside the control package 6.

The first and second relays 30, 32
Operates with the second power supply 42 as a power supply, and receives the first and second terminals 26, 2 respectively when the alarm signals 18, 24 are given through the inverters 20, 34 as described above.
8 is in a conductive state. To be more specific, in the present embodiment, when the absolute value of the voltage between the first control terminal 48 and the second control terminal 50 exceeds the reference voltage, the first and second control terminals 48 and 50 are turned on. The second terminals 26 and 28 are electrically connected, and the terminals 48 and 50 are electrically connected to each other.
When the voltage between them is equal to or less than the reference value, the first and second terminals 26 and 28 are non-conductive.

The control package 6 also includes fourth and fifth control packages.
Are provided. The first terminal 26 of the fourth relay 52 is connected to the ground, and the second terminal 28 is connected to the alarm output terminal 36, so that when the absolute value of the output voltage of the first power supply falls below a reference value, the first And the second terminal 2
6, 28 are mutually conducted. Also, the fifth relay 54
The first terminal 26 is connected to the ground, the second terminal 28 is connected to the alarm output terminal 36, and the first and second terminals are connected when the absolute value of the output voltage of the second power supply 42 falls below the reference value. 26 and 28 are mutually conducted.

More specifically, the relay control circuit 40 comprises a mono-multivibrator circuit 56 which operates by being supplied with power from the second power supply 42. The mono-multivibrator circuit 56 is provided with a power supply from the second power supply 42. , A low-level signal is output until approximately two seconds elapse, and then a high-level signal is output.
The third relay 38 conducts the first and second terminals 26 and 28 mutually when the output signal of the mono-multivibrator circuit 56 becomes high level.

Next, the control package 6 and the subordinate package 4 including the unnecessary alarm suppressing circuit 3 configured as described above.
The operation of will be described. Here, it is assumed that the control package 6 has been removed from the main body of the transmission apparatus 2 and that the control package 6 is mounted on the main body of the operating transmission apparatus. In addition, the first failure detection circuit 16 of the subordinate package 4
Does not detect a failure, so that the output signal of the first failure detection circuit 16 is at a low level and the output signal of the inverter 20 is at a high level.

When the control package 6 is mounted on the main body of the apparatus, power is supplied to the second power supply 42 from a first power supply (not shown) of -48 V of the main body of the apparatus. To start supplying power. By the way, immediately after the second power supply 42 starts operating, its output voltage is not sufficiently increased, while the output signal of the inverter 20 is at the high level as described above. Therefore, the voltage between the first control terminal 48 and the second control terminal 50 of the first relay 30 exceeds the reference value, and the first and second terminals 26 and 28 of the first relay 30 Is conducted. Therefore, conventionally, the warning signal 14 would be transmitted through the warning output terminal 36 here.

However, in the unnecessary alarm suppression circuit 3, the output signal of the mono-multivibrator circuit 56 is at a low level at this stage, and therefore, the third relay 38
Between the first and second terminals 26 and 28 are non-conductive. Therefore, even if the first and second terminals 26 and 28 of the first relay 30 conduct as described above, the first terminal 26 of the first relay 30 is not connected to the ground, and the alarm signal 14 ( Ground level) is not transmitted through the alarm output terminal 36.

Similarly, even if the second relay 32 is actuated for some reason immediately after mounting the control package and the first and second terminals 26 and 28 are electrically connected, the second
The first terminal 26 of the relay 32 is not connected to the ground because the connection between the first and second terminals 26 and 28 of the third relay 38 is non-conductive, and the alarm signal 14 is output through the alarm output terminal 36. It is not sent.

Thereafter, about two seconds elapse and the second power supply 4
2 and the output signal of the mono-multivibrator circuit 56 becomes high level, the first and second terminals 26 of the third relay 38,
28 conducts with each other and the first and second relays 30, 3
The second first terminal 26 is connected to the ground. Thereafter, when the first and second failure detection circuits 16, 22 output a high-level alarm signal, the first and second relays 30,
The electrical connection between the first and second terminals 26 and 28 of 32 is made, and the alarm signal 14 is sent to the alarm device 10 through the alarm output terminal 36. As a result, the alarm device 10 turns on the alarm lamp and sounds the alarm buzzer to notify the occurrence of a failure.

As described above, in the unnecessary alarm suppressing circuit 3 of the present embodiment, even if the control package 6 is mounted on the apparatus main body while the transmission apparatus main body is operating, a certain time elapses after mounting. Therefore, the first and second terminals 26 and 28 of the third relay 38 are not conducting until the respective parts of the control package 6 return to the original operation state.
Even if the first and second terminals 26 and 28 of the second relays 30 and 32 are turned on, the alarm signal 14 is not transmitted to the outside through the alarm output terminal 36. When the unnecessary alarm suppressing circuit 3 is used, there is no need to divide the control package 6 as in the related art, and only the mono multivibrator circuit 56 and the third relay 38 are provided. The problem of cost increase and size enlargement can be solved.

When the first power supply becomes abnormal and the absolute value of the power supply voltage falls below the reference value, the fourth relay 52 connects the first and second terminals 26 and 28 to each other. Make it conductive. Thereby, the alarm output terminal 36 is connected to the ground through the fourth relay 52, and the alarm output terminal 36
Will output an alarm signal 14. On the other hand, the fifth
When the second power supply 42 becomes abnormal and the absolute value of the power supply voltage falls below the reference value, the relay 54 turns on the first and second terminals 26 and 28 mutually. This allows
The alarm output terminal 36 is connected to the ground through the fifth relay 54, and the alarm signal 14 is transmitted from the alarm output terminal 36. These fourth and fifth relays 5
Normally, when the control package 6 is mounted on the apparatus main body, the first and second relays 52 and 54 do not operate erroneously. 26 is directly connected to the ground without passing through the third relay 38.

The first and second failure detection circuits 1
The output signals of 6 and 22 are supplied to the operation terminal device 8 through a simple logic circuit (not shown) as an alarm signal 12 (FIG. 2). The alarm signal 12 is output when the control package 6 is mounted on the device main body. This is usually not the case, and therefore, in the present embodiment, the first and second relays 30 and 32 are only activated when the control package is mounted to prevent an alarm from being issued.

[0027]

As described above, in the unnecessary alarm suppressing circuit of the present invention, the relay control circuit controls the third relay,
After a certain period of time has passed since the power was supplied, the first and second terminals of the third relay are made conductive to each other. Or later,
The first terminals of the first and second relays are connected to the reference potential point via the third relay, and when the first and second failure detection circuits output an alarm signal, the first and second relays are connected to the first and second relays.
The first and second terminals of the relay become conductive, and the alarm output terminal becomes the potential of the reference potential point, and an alarm signal is sent to the outside.

That is, in the unnecessary alarm suppression circuit of the present invention, even if the control package is mounted on the apparatus main body while the apparatus main body is in operation, each part of the control package is originally operated after a certain period of time after mounting. Until the operation state of
The first and second terminals of the first relay and the second relay are not conductive, so that even if the first and second terminals of the first and second relays are erroneously conductive, an alarm signal is output to the outside through the alarm output terminal. It will not be sent. Then, when the unnecessary alarm suppressing circuit of the present invention is used, it is not necessary to divide the control package as in the conventional case, so that the problems of cost increase and size increase of the device can be solved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an unnecessary alarm suppression circuit according to the present invention.

FIG. 2 is a schematic block diagram illustrating a configuration of a transmission device equipped with an unnecessary alarm suppression circuit.

[Explanation of symbols]

2 ... transmission device, 3 ... unnecessary alarm suppression circuit, 4 ... subordinate package, 6 ... control package, 8 ... operation terminal device, 10 ... alarm device, 12 ... alarm signal, 14 ...
Alarm signal, 16 first failure detection circuit, 18 alarm signal, 20 inverter, 22 second failure detection circuit, 24 alarm signal, 26 first terminal, 28 …
2nd terminal, 30 ... 1st relay, 32 ... 2nd relay, 34 ... inverter, 36 ... alarm output terminal, 3
8 Third relay, 40 Relay control circuit, 42
... second power source, 48 ... first control terminal, 50 ... second
, A fourth relay, 54... A fifth relay, 56... A monomultivibrator circuit.

Claims (6)

(57) [Claims] 1. A first method for detecting a failure and outputting an alarm signal
A plurality of subordinate packages each equipped with a failure detection circuit, and a second failure detection circuit that detects a failure and outputs an alarm signal, and is detachably mounted to a device body via a connector. Wherein the control package has first and second relays respectively having first and second terminals, and the first relay is connected to the first failure detection circuit via the connector. When an alarm signal is supplied, the first and second terminals are electrically connected to each other, and the second relay is connected to the first and second terminals when an alarm signal is supplied from the second failure detection circuit. And the second terminal of the first and second relays are both connected to the alarm output terminal of the control package, wherein the control package is mounted on the connector. A circuit provided in the control package to suppress unnecessary alarms generated when the control package includes a first terminal connected to a reference potential point and a second terminal connected to a reference potential point. A third relay connected to the first terminal of the first and second relays, and after a certain period of time has elapsed after power has been supplied, the first and second relays of the third relay An unnecessary alarm suppression circuit, comprising: a relay control circuit that electrically connects terminals. 2. The control package according to claim 1, further comprising a second power supply that operates by being supplied with power from a first power supply provided in the apparatus main body and supplies power to each circuit on the control package. The unnecessary alarm suppressing circuit according to claim 1, wherein the circuit operates by being supplied with power from the second power supply. 3. The relay control circuit includes a mono-multivibrator circuit that outputs a low-level signal until a predetermined time has elapsed after power is supplied, and then outputs a high-level signal. 2. The unnecessary alarm suppressing circuit according to claim 1, wherein said third relay turns on said first and second terminals mutually when an output signal of said mono-multivibrator circuit becomes high level. 4. An output voltage of the first power supply is about -48V.
3. The unnecessary alarm suppressing circuit according to claim 2, wherein the output voltage of the second power supply is about 5V. 5. The control package comprises a first and a second package.
And a fourth relay having the first terminal connected to a reference potential point and the second terminal connected to the alarm output terminal, wherein the fourth relay is connected to the first power supply. 3. The method according to claim 2, wherein the first and second terminals are electrically connected to each other when an absolute value of the output voltage is lower than a reference value.
Unnecessary alarm suppression circuit described. 6. The control package includes first and second packages.
And a fifth relay having the first terminal connected to a reference potential point and the second terminal connected to the alarm output terminal, the fifth relay being connected to the second power supply. 3. The method according to claim 2, wherein the first and second terminals are electrically connected to each other when an absolute value of the output voltage is lower than a reference value.
Unnecessary alarm suppression circuit described.