JPH01305796A - Refrigerator control system - Google Patents

Abstract

PURPOSE:To instantaneously detect the abnormality of a CPU, and to raise an alarm by monitoring always a carrier wave which the CPU to control and monitor plural refrigerators outputs always as a carrier signal. CONSTITUTION:The refrigerators 3a-3c are controlled and monitored by the CPU B through a transmission line 4, and a refrigerator trouble signal is supplied to a monitoring panel 6 through an abnormality alarm output control device 9, etc. On the other hand, the carrier wave which the CPU 8 outputs always to the line 4 is monitored always as the carrier signal by a carrier detection circuit 10, and the abnormality of the CPU 8 is detected instantaneously according to the presence or absence of the carrier signal, and the alarm is generated at the monitoring panel 6.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a refrigerator management system, and more particularly to a refrigerator management system that can instantaneously detect an abnormality in a central control unit that constitutes the central part of the system and output an alarm signal.

[Conventional technology]

FIG. 4 is a block diagram showing a conventional refrigerator management system. In the figure, numeral 1 is a central control device, which constitutes an overall control section of the refrigerator management system. and,
The central control device 1 sends out an operation display signal indicating that the central control device 1 is operating normally at a predetermined constant cycle. The operation display signal generation process can be carried out by providing an operation display signal output function in a part of the main program built in the central controller 1, for example, so that the operation display signal is generated every processing cycle of the main program. It is generated and output. Terminal control devices 28 to 2c individually control and monitor each of the refrigerators 3a to 3c, and are connected to the transmission line 4 to be centrally controlled by the central control device 1. Reference numeral 5 denotes an abnormality output control device that is connected to the transmission line 4 to detect a system abnormality and notify the outside. The abnormal output control device 5 then uses the terminal control devices 2a to 2a to
2C and the refrigerators 3a to 3C, and check the presence or absence of the operation display signal outputted from the central control device 1 using a built-in microprogram shown in FIG. 1 failure has been detected. Reference numeral 6 denotes a monitoring panel connected to the abnormality output control device 5, and an indicator light and a bell 7 for displaying the details of the failure are provided inside the monitoring panel. In the refrigerator management system configured in this way, the central controller l communicates with each terminal controller 2 via the transmission line 4.
By controlling a to 2C, this terminal control device 2a
The operation of each of the refrigerators 3a to 3c under the control of the refrigerators 3a to 3c is generally controlled. Moreover, this central control device 1 controls each terminal by taking in and determining the operating state of each refrigerator 3a to 3C detected by each terminal controlling device 2a to 2C and the operating state of each terminal controlling device 2a to 2C. A failure of the devices 2a to 2C and each of the refrigerators 3a to 3c is detected, and the details of the failure are output as failure information. On the other hand, when the abnormality output control device 5 detects the failure information output from the central control device 1, the abnormality output control device 5 determines the content and energizes the corresponding contact output relay (not shown), thereby controlling the necessary parts of the monitoring panel 6, etc. supply to. In the monitoring panel 6, depending on the signal supplied from the abnormal output control device 5,
An indicator light for displaying the corresponding content is turned on, and a bell 7 is rung to notify the administrator. Further, this abnormal output control device 5 checks the presence or absence of an operation display signal output from the central control device 1 to the transmission line 4 using a built-in microprogram shown in FIG. 1 failure has been detected. In other words, as mentioned above, the input information is
Since it is output at a predetermined constant period only when 1 is operating normally, if this input information cannot be detected for a period longer than the set period, the central It is only necessary to determine that the control device 1 has failed. To this end, in the microprogram shown as a flowchart in FIG. 5, the presence or absence of input information is first determined in step STI, and if the determination result is no, the process moves to step ST2 and an error timer counter is counted. After uploading, the process moves to step ST3. In step ST3, it is determined whether the error timer counter has overflowed, and if the result of the determination is no, the operation of returning to step STI via the transmission check step shown in step ST4 is repeated. Then, when the error timer counter is sequentially counted up and overflows after counting a preset value from the cycle of the system program in the central control device 1, the error timer counter is counted up sequentially, and when the error timer counter overflows, the period exceeds the cycle set in the operation display signal. Since the next input information is not supplied for a period of time, it is determined in step ST3 that the central controller 1 is abnormal, and in step ST5, a central controller abnormal output is generated, and step STI
Return to If the determination in step STI is YES, the process moves to step ST6 to perform a process of resetting the abnormal output of the central controller that continues to occur in step ST5, and in step ST7, a process of clearing the error timer counter is performed. I do. In step ST8, it is determined whether or not input information is to be processed, and if the result of the determination is no, the process returns to step STI via step ST4. Also, step ST8
If the determination result in is YES, step S
The process moves to T9, executes a contact output sending operation corresponding to the content of the detected abnormality, and returns. Therefore, even when an abnormality in the central control device 1 is detected in this way, a display indicating the details of the failure is displayed on the monitoring panel 6, and the administrator is notified of the occurrence of the abnormality by ringing the bell 7. become.

[Problem to be solved by the invention]

Conventional chiller management systems are configured as described above, so that, for example, an abnormality in the central control unit can be detected by determining the presence or absence of a relatively long-cycle operation display signal that is sent every cycle of the main program. It will have to be done. As a result, the detection of an abnormality cannot be determined until one cycle of the operation display signal has elapsed. There was a problem in that a large delay occurred. This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a refrigerator management system that can instantly detect abnormalities in a central control unit and issue an alarm.

[Means to solve the problem]

A refrigerator management system according to the present invention is provided with a carrier detection circuit that causes a central control device to constantly output a carrier wave to a transmission line, and constantly monitors II transmitted waves on the transmission line as a carrier signal. When the carrier wave supplied via the transmission line cannot be detected as a carrier signal, the central control unit determines that there is an abnormality and executes abnormality processing control.

[Effect]

The refrigerator management system of this invention constantly monitors the carrier wave sent from the central control unit onto the transmission line as a carrier signal, so if the central control unit breaks down, the carrier signal is cut off and the central control unit Abnormalities in the device will be detected instantly.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, reference numeral 8 denotes a central control device constituting an integrated part of the refrigerator management system, which controls each of the terminal control devices 2a to 2c connected via the transmission line 4, and also controls each of the terminal control devices 2a to 2c connected via the transmission line 4. 2c detects the status signals of each terminal control device and the status signals of each terminal control device 2a to 2c.
-2c and the details of the failure of the refrigerators 3a-3c are output as failure information. Various signals such as control signals and failure information sent from the central control device 8 to the transmission line 4 are output on a carrier wave that is always sent when the central control device 8 is normal. There is. Reference numeral 9 denotes an abnormality output control device that is connected to the transmission line 4 to detect a system abnormality and notify the outside. The abnormal output control device 9 determines the failure details of each terminal control device 2a to 2C and refrigerators [13a to 3C] from the failure information output from the central control device 8, and outputs it to the monitoring panel 7 and the outside. There is. Here, as shown in FIG. 2, for example, the abnormal output control device 9 includes a transformer 9a that is connected to the transmission line 4 and takes in a carrier wave, and demodulates the output of this transformer 9a so that the output is modulated by the carrier wave. A reception demodulation circuit 9b demodulates and extracts the failure information sent from the central control device 8, and outputs the signal demodulated in the reception demodulation circuit 9b from an output board as an abnormality detection signal A in a parallel configuration. , a serial transmission control circuit 9C with a semiconductor integrated circuit (LSI) configuration that converts a parallel configuration control signal supplied from the outside into a serial transmission signal and outputs the serial transmission signal.
and a transmission circuit 9d that supplies the serial transmission signal output from the series transmission control circuit 9c to the secondary side of the transformer 9a.
It is composed of. 10 is a carrier detection circuit that detects a carrier wave on a transmission line as a carrier, and as shown in FIG. 2, a waveform shaping circuit 10a that shapes the output of the reception demodulation circuit 9b in the abnormal output control device 9
O, R gate circuit 10b, amplifier circuit 10c having hysteresis characteristics, and OR gate circuit 1
0d in series and the output of this waveform shaping circuit 10a, the variable resistor 10e and the resistor 10
A retriggerable one-shot multivibrator circuit 10g generates an output with a time width determined by the value of f, and a light emitting diode 10h is generated by the set output generated from the set output terminal of this one-shot multivibrator circuit log. The inverter 10i that drives the lighting, the buffer amplifier 10j, and the inverter 10
k are connected in series, and the reset signal output from the reset output terminal of the one-shot multi-by-break circuit 10g, that is, the one-shot multi-by-break circuit 10g, is
and a relay drive circuit 10m that excites an abnormality alarm output relay 101 that supplies a central control unit abnormality detection signal to the monitoring panel 6 when the multivibrator circuit Log is reset and its reset output is at the "l Hl" level. . Next, the operation will be explained. The central control device 8 controls the respective terminal control devices 2a to 2C via the transmission line 4, thereby collectively controlling the operation of each of the refrigerators 3a to 3C under the control of the terminal control devices 2a to 2C. The central control device 8 also controls the operating states of the refrigerators 3a to 3c detected by the terminal control devices 2a to 2c and the operating states of the respective terminal control devices 2a to 2c.
A failure of each terminal control device W2a to 2c and each refrigerator 3a to 3c is detected by taking in and making a judgment on a signal indicating the operating state of each of a to 20 itself, and outputs the details of the failure as failure information. In this case, various signals output from the central control device 8 are as follows:
As mentioned above, it will be output together with the carrier wave. Therefore, the transformer 9a that constitutes the abnormal output control device 9 is
The carrier wave sent from 8 to the central control unit via the transmission line 4 is received and demodulated in the reception demodulation circuit 9b, thereby extracting failure information as a signal in a series configuration. The failure information extracted in this way is
By being determined in the series transmission control circuit 9c,
Terminal control device abnormality, refrigerator abnormality, confinement, etc. from the output board
It is supplied as an abnormality detection signal A such as external memory full to necessary locations such as the monitoring board 6 and a recording device (not shown). In the monitoring panel 6, when receiving the abnormality detection signal A for the terminal control devices 2a to 2c and each of the refrigerators a3a to 3C generated from the serial transmission control circuit 9C, the abnormality detection signal A is output.
A display light (not shown) indicating the contents of the message is lit, and a bell 7 is rung to notify the manager or the like. On the other hand, in the carrier detection device 10, a carrier wave that is constantly outputted from the central control device 8 to the transmission line 4 is received by the transformer 9a, and this received signal is input as a carrier signal via the reception demodulation circuit 9b. There is. In this carrier detection device 11, the waveform shaping circuit 10a shapes the waveform of the input carrier signal into a rectangular shape, and uses this shaped carrier signal to create a retriggerable type one-shot multi-byte break circuit. Trigger 10g. Here, since the one-shot multi-bye break circuit 10g has its operating time set to be longer than the period of the carrier signal, it is retriggered and continues in the set state during the period when the carrier signal is supplied. . When the one-shot multi-by-break circuit Log is set, the light emitting diode 10h, which indicates that a carrier signal is being received, is lit by the output of the inverter 10i which inverts the set output. Also, one-shot multi-bye break circuit Log
When is set, its reset output is ′′L 1
1, the output of the relay drive circuit 10m becomes “H”.
", and the abnormal alarm output relay lOl is energized. When the abnormal alarm output relay 10j2 is energized, its contact I
on will be closed, but here, in order to have a fail-safe configuration, a central control unit abnormality detection signal indicating an abnormality in the central control unit 8 is supplied to the monitoring panel 6 by opening the contact 10n. . Therefore, the monitoring panel 6 does not perform any operation when the abnormality alarm output relay ioz is in the operating state, assuming that it is in a normal state. Next, if the central control unit 8 malfunctions for some reason, the carrier waves that have been continuously sent to the transmission line 4 are cut off. When the carrier wave is cut off, the output of the waveform shaping circuit 10a that shapes the carrier wave as a carrier signal is turned off, and the one-shot multi-bye break circuit 1
The trigger for 0g will be stopped. Trigger is stopped and one-shot multi-bye break circuit 10g
When the is in the reset state, its set output becomes "L'", so inverter 1 inverts this set output.
The output of 0i becomes °H", and the light emitting diode 10h extinguishes smoke. Also, the one-shot multi-vibration break circuit 10g enters the reset state, and its reset output becomes °'
[When it is reversed to "1", the output of the relay drive circuit 10m using this reset output as manual power becomes "L I+", and each time the abnormality alarm output relay 10j2 is de-energized,
The contact 10m is opened and supplies a central control unit abnormality detection signal to the monitoring panel 6. When the monitoring panel 6 receives the central control unit abnormality detection signal, it lights up an indicator light (not shown) for displaying the details of the abnormality, and also rings a bell 7 to notify the supervisory staff, etc. Therefore, in the circuit configured in this way, the carrier detection circuit 4 constantly monitors the carrier signal that is constantly output to the transmission line when the central controller 8 is in a normal state. It becomes possible to determine the failure of the central control device 8. In the above embodiment, a case has been described in which the abnormality detection signal A and the central control unit abnormality detection signal are supplied to the monitoring panel 6 having a bell 6 etc. to notify the administrator, but the present invention is not limited to this. For example, as shown in FIG. 3, a transmitter 11 is provided to send the central control unit abnormality detection signal generated from the carrier detection circuit 4 to a distant telephone device via a communication system such as a telephone line. It may be transferred to 12. However, in this case, since it is necessary to convert the central controller abnormality detection signal into an audio signal and transfer it, it is assumed that the transmitter 11 is provided with an audio synthesis circuit or a cipher tone generation circuit. [Effects of the Invention] As described above, according to the present invention, the central control device is configured to output various signals on a carrier wave, and
A carrier detection device that constantly monitors the carrier wave sent from this central control device onto the transmission line as a carrier signal, detects when this carrier signal disappears, determines that there is an abnormality, and performs abnormality processing. Since the system is equipped with a central control unit, it is possible to instantly and directly detect an abnormality in the central control unit.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a refrigerator management system according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific example of the abnormal output control device and carrier detection device shown in FIG. 1, and FIG. FIG. 4 is a block diagram showing another embodiment of the refrigerator management system according to the invention. FIG. 4 is a block diagram showing a conventional refrigerator management system. FIG. 5 is a block diagram showing a conventional refrigerator management system. FIG. It is a flowchart showing a program. 2a to 2c are terminal control devices, 3a to 3c are refrigerators, 4 is a transmission line, 8 is a central control device, 9 is an abnormality alarm output control device, and 10 is a carrier detection circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (Cut Z Ru) Figure 2 Figure 5

Claims (1)

[Claims] A plurality of terminal control devices that control and monitor the refrigerator; a central control device that centrally controls each of the terminal control devices via a transmission line and always outputs a carrier wave to the transmission line during normal operation; An abnormality alarm output control device that determines failure information regarding each refrigerator and terminal control device outputted from a central control device and supplies it to necessary locations; and an abnormality alarm output control device that detects the carrier wave on the transmission line as a carrier signal. A refrigerator management system comprising: a carrier detection circuit that monitors the carrier signal, determines that the central controller is abnormal when the carrier signal cannot be detected, and sends a central controller abnormality detection signal to the outside.