JPH01311699A - Alarm display circuit - Google Patents

Abstract

PURPOSE:To economically miniaturize the driving constitution of a displaying element by providing a flicker oscillating circuit to make the change detecting signal of a change detecting circuit into a starting signal, a latch circuit to latch a change detecting signal and a gate circuit to add the output signal of the latch circuit and a flicker signal. CONSTITUTION:A flicker iscillating circuit 7 is started by the change detecting signal from a change detecting circuit 6, the change detecting signal is latched to a latch circuit 8, the flicker signal from the flicker oscillating circuit 7 and the output signal of the latch circuit 8 are added to a gate circuit 9 and the output signal is added to driving circuits 4 and 5 corresponding to two-lamp type alarm displaying elements 4 and 5. The output signal corresponding to the alarm signal from the change detecting circuit 6 is added to the driving circuits 4 and 5, and at the time of displaying a one-lamp type alarm, the output signal of the latch circuit 8 is added to a driving circuit 4 by a setting switch 10. Thus, by the smaller number of relays than the conventional example, the flicker displaying and the continuous lighting-up displaying can be controlled and the constitution can be economically miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an alarm display circuit that can be used in common for a single-light alarm display and a two-light alarm display.

In alarm display circuits in remote monitoring and control equipment, etc.
Either a single-lamp alarm display using only red color or a two-lamp alarm display using red and green colors are used. In the case of the former one-lamp alarm display, the light flashes when the alarm signal rises, and when you confirm that the light is dimming and stops blinking, it becomes continuous lighting, and then dims again when the alarm signal falls. After confirming this and stopping the blinking, the light will turn off. In the case of the latter two-lamp alarm display, the green light turns off and the red light flashes on and off when alarm No. 13 rises. Once you confirm that the light is dimming and stop blinking, the red light will remain lit continuously. Also, when the alarm signal falls, the red light will dim again, and when this is confirmed and the blinking is stopped, the red light will go out and the green light will continue to light up.

There is a need for an alarm display circuit that can be used in common with such a one-light alarm display and a two-light alarm display and that is economical.

[Conventional technology]

Figure 4 is a circuit diagram of the conventional example, 41.42 is D-free,
45 is a flip-flop at J- (hereinafter J-K is omitted), 43 is an exclusive OR circuit, 44 is a flicker oscillation circuit, 46 to 48 are buffer amplifiers, 49
~51 is a transistor, 52 is a short bin for setting a single-lamp alarm display and a two-lamp alarm display, 53.54 is a red (R), green ((1,) lamp, MP, FP, FL are Relay, mp, fpl, fp2. fj2 is the relay contact,
+Vcc is the power supply voltage of the relay, and +■ is the power supply voltage of the lamp.

(2) In the case of a light-type alarm display, only the red lamp 53 is mounted, and the short bin 52 is in a short-circuited state.

In addition, in the case of a two-lamp alarm display, the red lamp 53 and the green lamp 5
4 and the short bin 52 is left open. Furthermore, when the user is seated, relays MP, FP, and FL are in the restored state and their contacts are in the illustrated state. Therefore, in the case of a single-light alarm display, the red lamp 53 is off, and in the case of a two-light alarm display, the red lamp 53 is off and the green lamp 54 is on. Furthermore, protection diodes are connected in parallel with each of the relays MP, FP, and FL.

Alarm signal SV, latch signal AP from devices not shown
, a clock signal CLK and a stop signal FLS are applied. The latch signal AP is formed based on the clock signal CLK, and the stop signal FLS is input manually by a maintenance person or after a certain period of time after a change in the alarm signal SV.

FIG. 5 is an explanatory diagram of the operation of the conventional example, in which (a) shows the alarm signal SV, (b), (C1, (di is the relay MP, FP,
The operating state of the FL, (e) shows the lighting of the red lamp 53 in the case of a one-light type alarm display, and (f) and (g) show the lighting of the red lamp 53 and green lamp 54 in the case of a two-light type alarm display. show. The following description will be made with reference to these.

When the alarm signal S becomes "1" at time t1, the alarm signal SV is latched in the flip-flop 41 by the latch signal AP generated in synchronization with the clock signal CLK, and the Q terminal output signal of the flip-flop 41 becomes "1". 1". Therefore, transistor 49 is turned on and relay MP is (
Since it is in the operating state as shown in bl, the contact mp is switched from the state shown.

Also, since the Q terminal output signal of the flip-flop 42 is "0" at that time, the output signal of the exclusive OR circuit 43 becomes "1", which means that a change in the alarm signal SV has been detected. This output signal becomes a start signal, and the flicker oscillation circuit 44 outputs a flicker signal. Thereby,
Transistor 51 turns on and off repeatedly, relay FL
The operation and recovery will be repeated as shown in (d). Also, after the Q terminal output signal of the flip-flop 41 becomes "1", the clock signal CLK causes the Q terminal output signal of the flip-flops 42 and 45 to become "1", turning on the transistor 50, and relay FP ( It enters the operating state as shown in C1.

Therefore, relays MP and FP are in the operating state, and relay FL repeats operation and recovery according to the flicker signal, so contact m
p is switched to the red lamp 53 side, contact fp+ is turned off,
Contact rpz turns on, and contact f! (The red lamp 53 blinks and the green lamp 54 is not installed as shown in (e) in the case of a light-type alarm display), and in the case of a two-light alarm display, the short bin 52 is open, the green lamp 54 goes out as shown in (g), and the red lamp 53 blinks as shown in (f).

When the stop signal FLS is input at time t2 due to the blinking of the red lamp 53, the operation of the flicker oscillation circuit 44 is stopped and the flip-flop 45 is reset. Therefore, relays FP and FL are restored as shown in (cl, (d)), and only relay MP is in the operating state.Tea, (f
), the red lamp 53 lights up continuously.

At time t3, the alarm signal SV is “
When it falls from "1" to "O", it is latched by the flip-flop 41 at the timing of the latch signal AP, and the Q terminal output signal of the flip-flop knob 41 becomes "0".
Since the relay MP is restored as shown in (b), and the Q terminal output signal of the flip-flop 42 is "1" at that point, the output signal of the exclusive OR circuit 43 becomes "1", and the alarm signal SV A change in will be detected. Then, the flicker oscillation circuit 44 is activated by the signal and outputs a flicker signal, so that the relay FL repeats operation and recovery as shown in (dl).
5, the Q terminal output signal becomes "1" at the timing of the clock signal CLK, so the flip-flop FP operates as shown in (C).

Therefore, in the case of a single-light alarm display, the red lamp 53 flashes as shown in (el), and in the case of a two-light alarm display, (f
), as shown in (g), the red lamp 53 goes out and the green lamp 54 blinks.

When the stop signal FLS is input at time t4, the operation of the flicker oscillation circuit 44 is stopped and the flip-flop 4
5 is reset, so relays FP and FL are restored,
Since the contacts mp, fpl, rpz, and fβ are in the state shown in the figure, the red lamp 53 is turned off in the case of a single-lamp alarm display, and the red lamp 53 is turned off in the case of a two-lamp alarm display, and the green lamp 54 is turned off. Light.

[Problem to be solved by the invention]

As mentioned above, the conventional alarm display circuit can switch between a one-light alarm display and a two-light alarm display by shorting or opening the shorting pin 52, but the red lamp 53 and the green lamp In order to drive display elements such as 54, three relays MP, FP, and FL are required, which has the disadvantage of increasing the size.

The present invention aims to economically downsize the drive structure of a display element.

[Means to solve the problem]

The alarm display circuit of the present invention will be described with reference to FIG. Type alarm display element 2. 3. A change detection circuit 6 that applies a lighting signal to either one of the drive circuits 4 and 5 including a (RlG) compatible relay, etc. in response to an alarm signal, and a change detection circuit 6 that uses the change detection signal of this change detection circuit 6 as a start signal to generate a flicker. a flicker oscillation circuit 7 that outputs a signal and stops outputting the flicker signal in response to a stop signal; a second latch circuit 8 that latches the change detection signal of the change detection circuit 6; and an output signal of the second latch circuit 8. and the flicker signal of the output of the flicker oscillation circuit 7, and the gate circuit 9 which adds the flicker signal of the output of the flicker oscillation circuit 7, and the output signal of the second latch circuit 8. It is equipped with a setting switch 10 which is applied as a lighting signal to the corresponding drive circuit 4.

[Effect]

The change detection circuit 6 uses a change detection signal that detects a change in the rise and fall of the alarm signal as a start signal for the flicker oscillation circuit 7 and outputs a flicker signal. When latched, a flicker signal is output from the gate circuit 9. If only the one-lamp alarm display element 2 is installed, the setting switch 10 is turned on and the output signal of the latch circuit 8 is applied to the drive circuit 4 as a lighting signal. Also, 2-lamp alarm display element 2,
3 is installed, the setting switch 10 is turned off.

In addition, in response to the alarm signal from the change detection circuit 6, the drive circuit 4
．． Add a lighting signal to 5. For example, when the alarm signal becomes "1", a lighting signal is applied to the drive circuit 4, and when it becomes "0", a lighting signal is applied to the drive circuit 5. Then, when a flicker signal is applied via the gate circuit 9 while the lighting signal is being applied, the display elements 2 and 3 flash and display.
) When the operation of the flicker oscillation circuit 7 is stopped by the -/b signal, continuous lighting occurs in response to the lighting signal.

Therefore, when the alarm signal becomes "1", the flicker oscillation circuit 7 is activated by the change detection signal and outputs a flicker signal, and the change detection signal is latched by the second latch circuit 8, so that the gate circuit 9 A flicker signal is applied to the drive circuit 4.5 via the change detection circuit 6, and a lighting signal is applied to the drive circuit 4 from the change detection circuit 6. Thereby, the display element 2 blinks. When the stop signal is input, the flicker oscillation circuit 7 stops operating, so the display element 2 lights up continuously.

Also, when the alarm signal becomes "0", the flicker oscillation circuit 7 is activated by the change detection signal and outputs a flicker signal, and the change detection signal is latched by the latch circuit 8, so the flicker signal is generated via the gate circuit 9. is applied to the drive circuit 4.5, and a lighting signal is applied from the change detection circuit 6 to the drive circuit 5.

At this time, in the case of a one-lamp alarm display, the setting switch 10 is turned on, so the output signal of the latch circuit 8 is applied as a lighting signal to the drive circuit 4, and the display element 2 is turned on and off again. In the case of a two-lamp alarm display, the setting switch 10 is turned off and a lighting signal is applied to the drive circuit 5, so that the display element 3 blinks and lights up. Then, when the operation of the flicker oscillation circuit 7 is stopped by the stop signal, 1
In the case of a light type alarm display, the display element 2 is turned off, and in the case of a two-light type alarm display, the display element 2 is turned off and the display element 3 is lit continuously.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a circuit diagram of an embodiment of the present invention, 11.12 is a D flip-flop, 15 is a J- flip-flop (
In the following, rDJ and [J-Kl are omitted), 13 is an exclusive OR circuit, 14 is a flicker oscillation circuit, 16 is an AND circuit, 17 is a setting switch, 18 is a resistor, 19 is an OR circuit, 20.27 is a try State gate circuit, 21.2
2 is a resistor, 23.30 is a transistor, 24.31 is a relay, 25.32 is a diode, 28.29 is a resistor, 2
6.33 is the contact of relay 24.31, 34.35 is red (
R) and green (G) lamps, +V is the lamp power supply voltage, +
VCC is the relay power supply voltage, FLS is the stop signal,
SV is alarm signal, AP is latch signal, CLK is black,
signal.

A first latch circuit 1 is configured by a flip-flop 11, a change detection circuit 6 is configured by a flip-flop 12 and an exclusive OR circuit 13, and a flip-flop 15 constitutes a change detection circuit 6.
The second latch circuit 8 is configured by the AND circuit 16
The gate circuit 9 is configured by the resistors 18 . OR circuit 1
9. Tri-state gate circuit 20. Resistance 21, 22
．． Transistor 23. Relay 24. diode 25
The drive circuit 4 is configured by the tri-state gate circuit 27. Resistance 28.29. l-transistor 30, relay 31. The diode 32 constitutes a drive circuit 5'.

■In the case of a light type alarm display, only the red lamp 34 is mounted and the setting switch 17 is turned on, and in the case of a two-light type alarm display, the red lamp 34 and the green lamp 35 are mounted and the setting switch 17 is turned off. shall be. This setting switch 17 is connected between the flip-flop 15 and one input terminal of the OR circuit 19, and when turned on, the Q terminal output signal of the flip-flop 15 is input to the OR circuit 19, and turned off. As a result, "O" is input to the OR circuit 19 via the resistor 18.

Also, the latching of the alarm signal SV by the flip-flop 11,
A flicker oscillation circuit 1 detects a change in the alarm signal SV by a flip-flop 12 and an exclusive OR circuit 13, outputs a flicker signal using the change detection signal as a start signal, and stops outputting the flicker signal by a stop signal FLS.
The operation No. 4 is the same as the conventional example.

In this embodiment, when the Q terminal output signal of the flip-flop 15 is "1", if a flicker signal is output from the flicker oscillation circuit 14, the flicker signal is output to the tri-state gate via the AND circuit 16. Circuit 20.2
7 as the gate signal of flip-flop 12.
The Q terminal output signal or the d terminal output signal becomes the lighting signal, but the lighting signal is turned on and off by the gate signal,
It is applied to the base of transistor 23.30 via resistor 21.28.

When the transistor 23 turns on, the relay 24 operates L.
2. When the contact 26 is turned on, the red lamp 34 is turned on, and the transistor 30 is turned on, the relay 31 is operated, the contact 33 is turned on, and the green lamp 35 is turned on.

FIG. 3 is an explanatory diagram of the operation, (al is an alarm signal, mountain),
(C) is the Q terminal output signal of flip-flop 12 and 0
Terminal output signal, fdl is Q terminal output signal of flip-flop 15, (e) is red lamp 3 in case of single-lamp alarm display
4, (fl, (g)) shows the operation of the red lamp 34 and green lamp 35 in the case of a two-lamp alarm display.

At time t1, the alarm signal SV applied to the data terminal of the flip-flop 11 becomes 1'' as shown in (a), and the alarm signal SV is latched by the rise of the latch signal AP applied to the clock terminal C, and the The output signal is “
1". At this time, the Q terminal output signal of the flip-flop 12 remains "1" until the next clock signal CLK is applied.
O”, the output signal of the exclusive OR circuit 13 is “1”.
”.In other words, it becomes a change detection signal of the alarm signal SV,
This is applied as a start signal to the flicker oscillation circuit 14, and a flicker signal is output.

In addition, in the flip-flop 12 to which the clock signal CLK is applied to the clock terminal C, the Q terminal output signal becomes "1" as shown in (b) due to the latch output signal, and the d terminal output signal becomes "0" as shown in (C1). ”.Furthermore, the change detection signal is latched in the flip-flop 15, and its Q terminal output signal becomes “L” as shown by fdl.

Therefore, the flicker signal is applied as a gate signal to the tristate gate circuit 20.27 via the AND circuit 16, and the Q terminal output signal of the flip-flop 12 is applied to the tristate gate circuit 20 via the OR circuit 19. , the output signal changes in response to the flicker signal, the transistor 23 turns on and off in response to the flicker signal, and the relay 24 repeats operation and recovery.
The contact point 26 is repeatedly turned on and off, and in the case of a single-lamp alarm display, the red lamp 34 blinks as shown in tel. In the case of a two-lamp alarm display, the green lamp 35 is turned off as shown in (g), and the red lamp 34 is blinked as shown in (f).

When the maintenance person confirms the occurrence of the alarm by the flashing of the red lamp 34 and inputs the stop signal FLS at time t2 using an input means such as a switch (not shown), the flicker oscillation circuit 14 stops operating, and the flip-flop 15 is reset. Therefore, “1” of the flip-flop 12
"The transistor 23 continues to be on due to the Q terminal output signal, and the relay 24 continues to operate, so the red lamp 34 is either (el (1 light alarm display) or (f) (2 light alarm display). It lights up continuously as shown in .

Also, at time t3, the alarm signal SV becomes 0'' as shown in tel.
Then, the Q terminal output signal of the flip-flop 11 becomes "0" at the timing of the latch signal AP, and the output signal of the exclusive OR circuit 13 becomes "1", so the flicker oscillation circuit 14 is activated and generates the flicker signal. Output. In addition, due to the next clock signal CLK, the Q terminal output signal of the flip-flop 12 becomes "0" as shown in (b), the d terminal output signal becomes "1" (as shown in C1), and the Q terminal of the flip-flop 15 becomes "0" as shown in (b). The output signal is “1” as shown in (d)
becomes.

Therefore, the flicker signal is added as a gate signal to the tri-state gate circuit 20.27 via the AND circuit 16, and in the case of a one-lamp alarm display, since the setting switch 17 is on, the Q terminal output of the flip-flop 12 Even if the signal is "O", the Q terminal output signal of the flip-flop 15 is input to the tristate gate circuit 20 as a lighting signal, so the transistor 23 turns on and off according to the flicker signal, and the relay 24 repeats operation and recovery. Then, the red lamp 34 blinks as shown in (e).

In addition, in the case of a two-lamp alarm display, the setting switch 17 is off and the d terminal output signal of the flip-flop 2 is "1", so the transistor 30 turns on and off according to the flip-flop signal, and the relay 31 operates and restores. Repeating this, the green lamp 35 blinks as shown in (g). Also, since the Q terminal output signal of the flip-flop 12 is "O", the transistor 23 is turned off and the red lamp 34 is turned off as shown in (f).

The maintenance personnel confirmed that the alarm signal S■ disappeared due to the red lamp 34 transitioning from continuous lighting to blinking, or the red lamp 34 going out and the green lamp 35 blinking, and the illustration was omitted. When the stop signal FLS is input from the input means, the operation of the flicker oscillation circuit 14 is stopped and the flip-flop 15 is reset. Therefore, in the case of a single-lamp alarm display, the transistor 23 is turned off and the relay 2 is turned off.
4 is restored, the red lamp 34 goes out as shown in (el) and returns to the initial state.

In the case of a two-lamp alarm display, the transistor 30 is turned on continuously and the relay 31 is operated continuously, so the green lamp 35 is lit continuously as shown in (g), and the red lamp 34 is turned on continuously.
remains off as shown in (f). Therefore, it will return to the initial state.

The embodiment described above has red lamp 34 by means of relay 24.31.
2-lamp alarm display with green lamp 35 and red lamp 3
However, the present invention is not limited to this, and various additions and changes can be made. It is also possible to directly drive a display element such as a lamp or a light emitting diode using the display device 30 . Further, the AND circuit 16 may be a gate circuit having another configuration depending on the logic level of the output signal of the flip-flop 15 forming the second latch circuit. It is also possible to use the tristate gate circuits 20 and 27 as gate circuits with other configurations.

〔Effect of the invention〕

As explained above, the present invention detects a change in the alarm signal SV and starts the flicker oscillation circuit 7 by a change detection signal from the change detection circuit 6 that outputs the state of the alarm signal SV, and is latched by the second latch circuit 8, and the flicker signal from the flicker oscillation circuit 7,
The output signal of the second latch circuit 8 is applied to the gate circuit 9, the output signal is applied to the drive circuits 4 and 5 corresponding to the two-lamp alarm display element 2.3, and the alarm signal from the change detection circuit 6 is applied. The configuration is such that an output signal corresponding to the SV is added to the drive circuits 4 and 5, and an output signal of the second latch circuit 8 is added to the drive circuit 4 in the case of a single-lamp alarm display using the setting switch 10. If 4.5 is configured with a relay,
Since only two relays are required, blinking display and continuous lighting display can be controlled with a smaller number of relays than in the conventional example. Therefore, there is an advantage that miniaturization can be achieved economically. Further, the drive circuit 4.5 is connected to the display element 2.3.
Since the display element 2.3 is provided correspondingly, when the display element 2.3 is constituted by a light emitting diode or the like, it becomes possible to directly drive the display element 2.3 by the transistor 23.30 or the like without using a relay or the like.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a circuit diagram of an embodiment of the present invention, FIG. 3 is a diagram explaining the operation of an embodiment of the present invention, and FIG.
The figure is a circuit diagram of a conventional example, and FIG. 5 is an explanatory diagram of the operation of the conventional example. 1 is a first latch circuit, 2.3 is a display element, 4.5 is a drive circuit, 6 is a change detection circuit, 7 is a flicker oscillation circuit, 8
9 is a second latch circuit, 9 is a gate circuit, and 10 is a setting switch. Patent applicant Fujitsu Denso Ltd.

Claims (1)

[Claims] A first latch circuit (1) for latching an alarm signal; detecting a change in the output signal of the first latch circuit (1);
In addition, a drive circuit (4) compatible with two-lamp alarm display elements (2, 3)
, 5), a change detection circuit (
6), a flicker oscillation circuit (7) that outputs a flicker signal using the change detection signal of the change detection circuit (6) as a start signal, and stops outputting the flicker signal in response to a stop signal; and the change detection circuit (6). ); a gate circuit (9) that adds the output signal of the second latch circuit (8) and the output signal of the flicker oscillation circuit (7); , When only the one-lamp alarm display element (2) is installed, the output signal of the second latch circuit (8) is sent as a lighting signal to the drive circuit (4) corresponding to the one-lamp alarm display element (2). An alarm display circuit characterized in that it is equipped with a setting switch (10).