JPH01307000A - Alarm transfer system - Google Patents

Abstract

PURPOSE:To detect the generation of an alarm and operation of an alarm output circuit and to discriminate the presence/absence of omission of a unit by transferring alarm signals indicating the normal and abnormal states of a device to an alarm collection circuit from the alarm output circuit. CONSTITUTION:When a device is abnormal, a switching section 5 connects a DC generation circuit 7 which an alarm transferring line 8 in accordance with a signal (b) inputted from an alarm output circuit 3 and indicating the abnormality and the DC signal of the circuit 7 becomes an alarm signal (c) and is transferred to an alarm collection circuit 9. Upon detecting the DC alarm signal, the circuit 9 displays that the device is abnormal. When a unit omission is produced due to the omission of a signal monitoring section 1, etc., the alarm transferring line 8 is set to 'OPEN' state and the alarm signal (c) from the signal monitoring section 1 does not reach an alarm section 2. Therefore, the occurrence of the unit omission can be recognized at the alarm collection circuit 9 because the alarm signal (c) is not inputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an alarm transfer system characterized by an alarm output system of an alarm output circuit.

[Conventional technology]

The conventional alarm transmission method monitors the operation of a predetermined device, detects its normality or abnormality, and transmits the alarm information.
In the logic mode, a method was adopted in which the alarm was transferred from the alarm output circuit to a predetermined circuit by switching on or off.

For example, under normal conditions it is in the open (OPEN) state, under abnormal conditions it is in the grounded (GND) state, and under normal conditions it is in the GN
Alarm information was transferred by providing a logic interface or the like in the alarm output circuit that would be in the D state and in the 0PEN state when an abnormality occurred.

[Problem to be solved by the invention]

In the conventional alarm transfer method described above, the
In the case of a logic interface that takes the PEN state and takes the GND state when an error occurs, the 0PEN state between the unit and the transfer destination circuit due to a unit disconnection such as a logic interface is judged as the normal 0PEN state, so the corner・Unable to detect failure due to missing 7 totes.

In addition, in the case of an interface that takes the GND state when normal and takes the 0PEN state when abnormal, it is possible to detect a failure due to a unit being removed, contrary to the above case.
There is a drawback that it is impossible to determine whether or not the alarm output circuit is operating normally.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an alarm transfer system capable of detecting the state of the unit I/O and the presence or absence of operation of the alarm output circuit.

[Means to solve the problem]

The alarm transfer method of the present invention includes an alarm detection circuit that monitors the operation of a predetermined device and detects its normality or abnormality, and a pulse-shaped alarm signal that indicates that the device is normal when the alarm detection circuit detects normality. an alarm output circuit having a pulse generation circuit that generates a pulse and a DC generation circuit that generates a DC-like alarm signal indicating an abnormality in the device when the alarm detection circuit detects an abnormality; and each of the alarm signals from the alarm output circuit. The device is characterized by comprising an alarm collection circuit that inputs the information and determines whether the device is normal or abnormal.

〔Example〕

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

FIG. 1 is a block diagram showing an alarm transfer method according to an embodiment of the present invention.

The alarm transfer method includes a signal monitor unit 1 that monitors the operation of a predetermined device and determines whether the device is normal or abnormal;
The apparatus includes an alarm section 2 that receives alarm information from the signal monitor section 1.

The signal monitor section 1 includes an alarm detection circuit 3 and an alert output circuit 4.

The alarm detection circuit 3 has a function of inputting a monitor signal a from the device and detecting whether the device is normal or abnormal based on this signal a. The alarm detection circuit 3 also has a function of controlling the alarm output circuit 4 by outputting a detection signal corresponding to the detection result to the alarm output circuit 4.

The alarm output circuit 4 is provided with a pulse generation circuit 6 and a DC generation circuit 7 that are connected to the alarm detection circuit 3 via a switching section 5. The switching unit 5 switches the alarm transfer path 8 when the detection signal is a signal indicating that the device is normal.
and the pulse generation circuit 6, and when the signal indicates an abnormality in the device, the alarm transfer path 8 and the DC generation circuit 7 are electrically connected.

The pulse generation circuit 6 generates a pulse signal with a pulse period set in the range of several microseconds to several milliseconds as an alarm signal C.
It is composed of a gate, a capacitor, and a resistor (not shown). The DC generating circuit 7 generates a constant voltage DC signal as an alarm signal C, and is constituted by an integrating circuit.

The alarm unit 2 is provided with an alarm collection circuit 9 connected to an alarm transfer path 8. This alarm collection circuit 9 has a function of collecting the alarm signal C transferred via the alarm transfer path 8 and detecting the type of the alarm signal C.

Next, the operation shown in this embodiment will be explained.

If the unit has not come off due to the signal monitor section 1 falling off, etc., the alarm transfer path 8 is not in the 0PEN state, and the alarm output circuit 4 and alarm collection circuit 9 are connected via the alarm transfer path 8. Therefore, the alarm signal C based on the monitor signal a is reliably transferred from the alarm output circuit 4 to the alarm collection circuit 9. That is, when the monitor signal a is applied to the alarm detection circuit 3, the alarm detection circuit 3 detects whether the apparatus is normal or abnormal based on the signal a. If the device is normal, the alarm detection circuit 3 inputs a detection signal indicating normality to the alarm output circuit 4. This signal causes the alarm switching section 5 to connect the pulse generation section 6 and the alarm transfer path 8, and the pulse signal generated from the pulse generation section 6 is transferred as an alarm signal C to the alarm collection circuit 9 of the alarm section 2. The alarm collection circuit 9 detects this pulsed alarm signal C and indicates that the device is normal. On the other hand, if the device is abnormal, the switching unit 5 connects the DC generation circuit 7 and the alarm transfer path 8 in response to the signal indicating the abnormality inputted from the alarm detection circuit 3, and the DC signal from the DC generation circuit 7 is output. becomes an alarm signal M, and is transferred to the alarm collection circuit 9. The alarm collection circuit 9 detects this DC alarm signal and indicates that the device is abnormal.

If the unit is missing due to the signal monitor section 1 falling off, etc., the alarm transfer path 8 will be in the EN state, and the alarm signal C from the signal monitor section 1 will not reach the alarm section 2. Therefore, the alarm collection circuit 9 can recognize that the Uniso I/miss has occurred since the signal C is not input.

As described above, according to this embodiment, it is possible to determine whether or not a unit is missing depending on whether or not the alarm signal C has reached the alarm collection circuit 9, and whether the alarm signal C is a pulse signal or a DC signal can be determined. It has the effect of determining whether the device is normal or abnormal.

In addition, the pulse generation circuit 6 is a gate and a capacitor.

Since it is composed of resistors and the alarm 1 and collection circuit 9 are composed of simple integrating circuits, these circuits can be easily manufactured at low cost.

In this example, pulse signals and DC signals are used as signals indicating whether the device is normal or abnormal; however, this is not intended to limit the use of signals that can clearly indicate normality or abnormality. The good news is obvious.

〔Effect of the invention〕

As explained above, the alarm transfer method of the present invention is configured to transfer an alarm signal indicating whether the device is normal or abnormal from the alarm output circuit to the alarm collection circuit. This has the effect of being able to detect and determine whether or not a unit is missing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an alarm transfer method according to an embodiment of the present invention. 1...Signal monitor section 2...Alarm section, 3...Alarm detection circuit 4...Alarm output circuit 5...Switching section 6... Pulse generation circuit 7...DC generation circuit 8...Alarm transfer path 9...Alarm collection circuit Agent Patent attorney Yoshiyuki Iwasa

Claims (1)

[Claims] (1) An alarm detection circuit that monitors the operation of a predetermined device to detect whether it is normal or abnormal, and a pulse generation circuit that generates a pulse-like alarm signal indicating that the device is normal when this alarm detection circuit detects normality. and a direct current generation circuit that generates a direct current alarm signal indicating an abnormality in the device when the alarm detection circuit detects an abnormality; An alarm transmission method characterized by comprising an alarm collection circuit that determines whether the device is normal or abnormal.