JP2570994B2 - Alarm signal communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm signal communication device, and more particularly, to a method of communicating an alarm signal transmitted via a cable provided between units.

[0002]

2. Description of the Related Art Conventionally, in this type of alarm signal communication method, as shown in FIG.
Each alarm and ground (GND) signal (cable disconnection information) detected in the unit 4 by each of 0-1 to 40-3
Is transmitted to the unit 5 through the inter-unit connection cable 6.

In the unit 5, an inter-unit connection cable 6
By detecting each alarm and ground signal received from the unit 4 through the alarm detection block 50,
The presence or absence of an alarm is determined.

[0004]

The above-described conventional alarm signal communication method employs a configuration in which an alarm signal detected in a unit and a ground signal for checking for cable disconnection are transmitted in parallel through an inter-unit connection cable. I have.

For this reason, if the number of alarm signals increases or the number of signals other than alarm signals in the inter-unit connection cable increases, a pin neck (insufficient number of cores) of the inter-unit connection cable occurs. There is.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to increase the number of alarm signals or increase the number of signals other than alarm signals in the inter-unit connection cable. It is an object of the present invention to provide an alarm signal communication device which can prevent a pin neck of the present invention.

[0007]

An alarm signal communication device according to the present invention is an alarm signal communication device for communicating an alarm signal via a cable disposed between a first unit and a second unit. One unit is a set of a plurality of alarm detecting means for detecting a plurality of different alarms in its own unit, and a detection state of each of the plurality of alarm detecting means. Identification means for identifying matching, and a detection status of the alarm in accordance with an identification result of the identification means.
A plurality of signal generation means for outputting a pulse signal corresponding to the combination of the state, the output of said plurality of signal generating means each
And means for outputting one Chino to the second unit, the second unit, whether the signal from the signal generating means are and corresponding provided corresponding to said plurality of signal generating means each It comprises a plurality of signal detecting means for detecting, and determining means for determining a combination of the detected state of the alarm based on the detection result of said plurality of signal detecting means, respectively.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, a unit 1 is configured so that three types of alarms are detected by alarm detection blocks 10-1 to 10-3.

Alarm detection blocks 10-1 to 10-3
Detects an alarm in the unit 1 and, if an alarm is detected, sets the signal to the output alarm interpretation block 11 to "H". Also, the alarm detection block 10-1
If no alarm is detected, the signals to the output alarm interpretation block 11 are set to "L".

When the output alarm interpretation block 11 receives a signal from the alarm detection blocks 10-1 to 10-3, that is, a signal indicating the presence or absence of each alarm in the unit 1,
It is identified which of the alarm detection blocks 10-1 to 10-3 is in a state where an alarm is being detected. The output alarm interpretation block 11 outputs a signal corresponding to the identification result to the pulse generation blocks 12-1 to 12-8 corresponding to the signal.

That is, the alarm detection block 10-1
Let A be the alarm detected by the alarm, B be the alarm detected by the alarm detection block 10-2, and C be the alarm detected by the alarm detection block 10-3.
The output alarm interpretation block 11 detects whether there is no alarm, only alarm A is detected, only alarm B is detected, only alarm C is detected, or two alarms A and B are detected. Whether alarm A or C has been detected, or whether alarms B and C have been detected.
Are detected or whether all of the alarms A to C are detected.

The pulse generation blocks 12-1 to 12-8 are provided corresponding to the above detection states, and generate pulse signals of different frequencies.
It is assumed that the frequencies of the pulse signals generated in each of the pulse generation blocks 12-1 to 12-8 are sufficiently separated from each other.

The pulse generation blocks 12-1 to 12-8 generate a pulse signal if the detection state identified by the output alarm interpretation block 11 corresponds to the own circuit, and do not generate a pulse signal otherwise. .

That is, the pulse generation blocks 12-1 to 12-1
2-8, when the detection state corresponding to the own circuit is identified in the output alarm interpretation block 11, the signal to the OR block 13 is set to "H".

Further, the pulse generation blocks 12-1 to 12-12
For -8, if the detection state corresponding to the own circuit is not identified in the output alarm interpretation block 11, the signal to the OR block 13 is set to "L".

The OR block 13 takes the logical sum of the outputs of the pulse generation blocks 12-1 to 12-8, and outputs the operation result through the unit connection cable 3 to the pulse break detection blocks 20-1 to 20-8 of the unit 2. Output to

The pulse disconnection detection block 20 of the unit 2
In 1 to 20-8, the time constants of disconnection detection are set so that disconnection detection of pulse signals generated in the corresponding pulse generation blocks 12-1 to 12-8 can be performed.

Pulse disconnection detection blocks 20-1 to 20-8
Performs disconnection detection of the pulse signal received from the OR block 13 and outputs the detection result to the disconnection detection result interpretation block 21.

In the disconnection detection result interpretation block 21, it is determined that an alarm corresponding to the disconnection detection result received from the pulse disconnection detection blocks 20-1 to 20-8 for which no disconnection is detected is generated in the unit 1. Judge, convert the corresponding alarm into a parallel signal, and
Output to

Here, the pulse break detection blocks 20-1 to 20-1
In the case of a configuration in which a pulse 20-20 detects disconnection of a pulse of a certain frequency or higher, the pulse disconnection detection blocks 20-1 to 20-
In some cases, disconnection detection may not be performed in a plurality of disconnection detection blocks out of eight.

In this case, for example, if the shortest time constant of the disconnection detection block corresponding to the state in which all the alarms A to C are detected is assigned, and the long time constant is sequentially assigned in accordance with the detection state, The disconnection detection result interpretation block 21 determines that the alarm corresponding to the shortest time constant among those for which no disconnection has been detected has occurred in the unit 1.

The alarm detection block 22 detects an alarm in the unit 1 based on the parallel signal from the disconnection detection result interpretation block 21. If one of the alarm detection blocks 10-1 to 10-3 detects the cable disconnection, the alarm information including the necessary cable disconnection information is always transmitted via one signal line. It is possible to do.

As described above, the alarm detection state is output based on the alarm detection results of the alarm detection blocks 10-1 to 10-3 in the unit 1.
1, the logical sum of the outputs from the pulse generation blocks 12-1 to 12-8 for outputting a pulse signal corresponding to the result of the identification is calculated by the logical sum block 13, and the operation result is transmitted via the unit connection cable 3. And outputs it to the unit 2 and, based on the calculation result, the pulse break detection block 20
Pulse generation blocks 12-1 to 12- in -1 to 20-8
8, the disconnection detection result interpretation block 21 determines the presence or absence of an alarm on the basis of the disconnection detection results. The signal can be converted into a single signal line and transferred between the units 1 and 2.

Therefore, even if the number of alarm signals increases or the number of signals other than alarm signals in the inter-unit connection cable 3 increases, the pin neck of the inter-unit connection cable 3 can be prevented.

[0026]

As described above, according to the present invention, in an alarm signal communication device for communicating an alarm signal via a cable provided between a first unit and a second unit, the alarm signal communication device in the first unit is provided. An alarm detection state is identified based on the presence or absence of the alarm detection, a logical operation is performed on outputs of a plurality of signal generating means for outputting a signal corresponding to the identification result, and the operation result is output to the second unit. With
The second unit detects the presence or absence of a signal from the corresponding signal generation means based on the calculation result, and determines the alarm detection state based on the detection result. Even when the number of signals other than the alarm signal in the inter-unit connection cable increases, the pin neck of the inter-unit connection cable can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 1, 2 unit 3 unit connection cable 10-1 to 10-3 alarm detection block 11 output alarm interpretation block 12-1 to 12-8 pulse generation block 13 OR block 20-1 to 20-8 disconnection detection block 21 disconnection Detection result interpretation block 22 Alarm detection block

Claims (3)

(57) [Claims] 1. An alarm signal communication device for communicating an alarm signal via a cable disposed between a first unit and a second unit, wherein the first unit has a plurality of different units in its own unit.
A plurality of alarm detecting means for detecting the alarms of the above, and a set of alarm detection states of each of the plurality of alarm detecting means.
And identifying means for identifying combined, correspond to each combination of the detected state of the alarm in response to the identification result of the identifying means
A plurality of signal generating means for outputting a pulse signal, and one of the outputs of each of the plurality of signal generating means is connected to the second signal generating means.
Means for outputting to the unit, wherein the second unit is provided in correspondence with each of the plurality of signal generating means and detects the presence or absence of a signal from the corresponding signal generating means. means and alarm signal communication apparatus, comprising a determining means for determining a combination of the detected state of the alarm based on the plurality of signal detecting means each detected result. 2. The method according to claim 1, wherein each of the plurality of signal generating units is connected to each other.
Sufficiently away alarm signal communication apparatus according to claim 1, characterized by being configured to generate a pulse signal of a frequency. 3. The apparatus according to claim 2, wherein the identification unit is configured to output one of the identification results in accordance with a combination of the detection states of the alarm, thereby driving one of the plurality of signal generation units. The alarm signal communication device according to claim 1 or 2, wherein