JPH11232144A - Monitor and control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitor and control system which can easily realize a sounding function of an alarm buzzer and an output function of an alarm contact. SOLUTION: When a buzzer control command of a serial signal is transmitted to a receiver 11 of an alarm buzzer circuit 1 from a general serial interface 20 of a personal computer 2, a timing signal generation circuit 13 generates a reception clock from the serial signal and a clock from a clock oscillation circuit 14. A reception data judging circuit 12 receives the serial signal by the reception clock to judge the serial command. A buzzer circuit 15 sounds the alarm buzzer through a speaker 17 according the judgment result, and a contact output circuit 16 turns on the output of an alarm contact 18 according to the judgment result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supervisory control system, and more particularly, to a supervisory control system for notifying the occurrence of a failure in a monitored equipment.

[0002]

2. Description of the Related Art Conventionally, in a monitoring and control system using a personal computer as a center device, a dedicated alarm monitoring device is installed on a monitoring transmission line separately from the personal computer as the center device to monitor equipment to be monitored. An alarm buzzer for notifying the occurrence of a failure is controlled, or a dedicated alarm buzzer is installed in an expansion slot of a personal computer as a center device.

In the center device of the monitoring and control system, it is necessary to sound an alarm buzzer and output an alarm contact. However, when a personal computer is used for the center device, the volume of the speaker built in the personal computer is insufficient. Does not have a contact output function as standard.

[0004]

In the conventional monitoring and control system described above, when a personal computer is used as a center device, the volume of a buzzer built in the personal computer is low, and it is necessary to reliably transmit an alarm to the surroundings. It cannot be used as an alarm buzzer for control systems. In general, a monitoring and control system requires a contact output for notifying the occurrence of an alarm to the outside, but a buzzer built in a personal computer is not provided with a contact output function.

In the above monitoring and control system, a complicated circuit is required to collect the buzzer control information from the monitoring transmission line. Therefore, a dedicated alarm monitoring device is installed on the monitoring transmission line. In the case of the method of controlling the alarm buzzer, the circuit configuration of the alarm buzzer becomes complicated.

Further, since the dedicated alarm buzzer installed in the expansion slot is a device dedicated to a certain personal computer, it may not be possible to use the personal computer when the manufacturer of the personal computer is different. It cannot be used when there is no space or when there is no room, that is, there is no versatility as a monitoring control system.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a monitoring control system capable of easily realizing a function of sounding an alarm buzzer and outputting an alarm contact.

[0008]

A supervisory control system according to the present invention is a supervisory control system using a personal computer as a center device, wherein the serial signal is connected to a serial interface of the personal computer and received through the serial interface. An alarm buzzer circuit that sounds an alarm buzzer and outputs an alarm contact in response to the buzzer control command.

That is, the monitoring and control system of the present invention comprises:
The buzzer for alarm and the output of the alarm contact are performed by the buzzer control command of the serial signal received from the serial interface of the personal computer.

More specifically, a means for receiving a serial signal from a personal computer, a timing signal generating means for generating a received clock, a determining means for determining a command content of received data, and a sounding of an alarm buzzer A buzzer sounding means for performing the operation and an alarm contact output means for outputting an alarm contact are provided.

The buzzer control command of the serial signal received from the serial interface of the personal computer is judged by the judging means, and the buzzer sounding means and the alarm contact output means sound the alarm buzzer and output the alarm contact. Thereby, it is possible to easily realize the function of sounding the alarm buzzer and outputting the alarm contact.

[0012]

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 a monitoring control system according to one embodiment of the present invention. In the monitoring control system according to one embodiment of the present invention, an alarm buzzer circuit 1 is connected to a general-purpose serial interface 20 of a personal computer 2.

The alarm buzzer circuit 1 includes a receiver 11, a reception data determination circuit 12, and a timing signal generation circuit 13.
, A clock oscillation circuit 14, a buzzer circuit 15, a contact output circuit 16, a speaker 17 for a buzzer, and a contact 18 for an alarm output. In this case, it is desirable that the buzzer speaker 17 and the alarm output contact 18 be included in the alarm buzzer circuit 1.

Next, the operation of the monitoring and control system according to one embodiment of the present invention will be described in detail with reference to FIG.

The receiver 11 of the alarm buzzer circuit 1 has a general-purpose serial interface 2 of the personal computer 2.
From 0, a serial signal buzzer control command is transmitted. The timing signal generation circuit 13 generates a reception clock from the serial signal received from the receiver 11 and the clock received from the clock oscillation circuit 14, and supplies the reception clock to the reception data determination circuit 12.

The received data determination circuit 12 receives the serial signal from the receiver 11 with the received clock received from the timing signal generation circuit 13, determines the command content of the serial signal, and outputs the determination result to the buzzer circuit 15 and the contact. The signals are transmitted to the output circuit 16 respectively.

The buzzer circuit 15 includes a reception data determination circuit 12
The speaker 17 sounds according to the result of the determination. The contact output circuit 16 turns on the alarm contact 18 according to the determination result of the received data determination circuit 12.

FIG. 2 is a block diagram showing a detailed configuration of the reception data determination circuit 12 and the timing signal generation circuit 13 of FIG. In the figure, a received data determination circuit 12 includes a shift register 12a, a comparator 12b, and a latch 12c, and a timing signal generation circuit 13 includes a start bit detection circuit 13a, a reception clock generation circuit 13b, and a latch clock generation circuit 13c. It is composed of

A start bit detection circuit 13a of the timing signal generation circuit 13 detects a start bit of data received from the receiver 11, and outputs a start clock signal to the reception clock generation circuit 13b.
Generates a reception clock based on the timing signal from the start bit detection circuit 13a.

The latch clock generation circuit 13c generates a latch clock for buzzer signal latch from the timing signal from the start bit detection circuit 13a and the reception clock from the reception clock generation circuit 13b.

The shift register 12a of the reception data judgment circuit 12 takes in the reception data from the receiver 11 with the reception clock from the reception clock generation circuit 13b and converts it into parallel data D0 to D7.

The comparator 12b is a shift register 12
The parallel data D0 to D7 from a are compared with preset command data, and a matching buzzer sound signal or stop signal is output. The latch 12c latches a buzzer sound signal or a stop signal from the comparator 12b with a latch clock from the latch clock generation circuit 13c, and outputs a buzzer signal (heavy alarm, heavy alarm, middle alarm, light alarm).
Is output.

FIG. 3 is a time chart showing the operation of one embodiment of the present invention. The operation of the embodiment of the present invention will be described with reference to FIGS. Here, in one embodiment of the present invention, it is assumed that the buzzer circuit 15 outputs different tone colors for each of four alarm levels of a light alarm, a medium alarm, a heavy alarm, and a heavy alarm.

The communication system for the data received from the personal computer 2 is asynchronous. Further, the command length of the buzzer control is 1 byte, and R0 to R7 of the received data in FIG.
S0 to S7 indicate buzzer OFF commands, respectively.

The operation when a light alarm buzzer ON command and a buzzer OFF command are received from the personal computer 2 will be described below.

(A) Received data (R) from the receiver 11
0 to R7) are supplied to the start bit detection circuit 13a, the timing of the detected start bit is transmitted to the reception clock generation circuit 13b, and a (B) reception clock synchronized with the reception data is generated.

The latch clock generation circuit 13c generates an (E) latch clock for buzzer signal latch by counting the number of reception clocks after detecting the start bit.

The shift register 12a sequentially shifts (A) received data input from a serial input by (B) a received clock to obtain (C) a shift register parallel output.

The parallel output D0 of the shift register 12a
If D7 is R0 to R7, the comparator 12b determines that the alarm is a light alarm, and (D) the comparator output "= light"
Turn the signal ON.

Since the latch 12c latches the (D) comparator output with the (E) latch clock, the (F) light alarm of the latch output is turned on at the timing of (a) and transmitted to the buzzer circuit 15 and the contact output circuit 16. Speaker 17
, The light alarm buzzer sounds and the light alarm contact output is turned ON.

If the subsequent (A) received data is S0 to S7, the parallel output D0 of the shift register 12a
When D7 becomes S0 to S7, the comparator 12b determines that the buzzer is stopped, and (D) turns on the "= stop" signal of the comparator output. The latch 12c latches "= stop" of the (D) comparator output with the (E) latch clock, and turns off the (F) latch output light alarm at the timing of (b). This stops the sounding of the light alarm buzzer in the speaker 17 and turns off the light alarm contact output.

As described above, when sounding the alarm buzzer, the personal computer 2 sends an ON command (1 byte) of the corresponding alarm level, and when the alarm buzzer is stopped, the personal computer 2 also sends the ON command. By transmitting the buzzer stop command (1 byte), the alarm buzzer can be controlled.

As described above, since a simple command specialized for buzzer control is received instead of an advanced transmission line such as a monitoring transmission line, the alarm buzzer sounds and the alarm contact is output with a simple circuit configuration. Can be realized.

Further, since the alarm buzzer circuit 1 is simply connected to the general-purpose serial interface 20 generally provided in the personal computer 2, the versatility that the center device (personal computer) of the monitoring control system to be connected can be selected is obtained. Can be.

[0035]

As described above, according to the present invention, in a monitoring and control system using a personal computer as a center device, an alarm buzzer is controlled according to a buzzer control command of a serial signal received through a serial interface of the personal computer. By outputting the sound and the output of the alarm contact, there is an effect that the sound of the alarm buzzer and the output function of the alarm contact can be easily realized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a monitoring control system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a detailed configuration of a reception data determination circuit and a timing signal generation circuit of FIG. 1;

FIG. 3 is a time chart showing the operation of one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 alarm buzzer circuit 2 personal computer 11 receiver 12 received data judgment circuit 12 a shift register 12 b comparator 12 c latch 13 timing signal generation circuit 13 a start bit detection circuit 13 b reception clock generation circuit 13 c latch clock generation circuit 14 clock oscillation circuit 15 buzzer circuit 16 contacts Output circuit 17 Speaker for buzzer 18 Contact for alarm output

Claims (3)

[Claims] 1. A monitoring and control system using a personal computer as a center device, wherein an alarm buzzer sounds in response to a buzzer control command of a serial signal connected to a serial interface of the personal computer and received through the serial interface. And a warning buzzer circuit for outputting a warning contact. 2. The alarm buzzer circuit includes a receiving unit that receives a serial signal from the personal computer, a timing signal generating unit that generates a receiving clock for the serial signal, and the receiving clock from the timing signal generating unit. Determination means for determining the content of the buzzer control command based on the buzzer control command, buzzer sounding means for controlling the sounding of the alarm buzzer according to the determination result of the determination means, and the alarm according to the determination result of the determination means 2. The monitoring control system according to claim 1, further comprising alarm contact output means for controlling the output of the contact. 3. The timing signal generating unit includes: a start bit detecting unit configured to detect a start bit of the serial signal; and a reception unit configured to generate the reception clock based on the start bit detection timing of the start bit detecting unit. A clock generation unit, and a latch that generates a latch clock for holding a determination result of the determination unit based on the detection timing of the start bit by the start bit detection unit and the reception clock generated by the reception clock generation unit. A clock generator; a converter configured to convert the serial signal into parallel data based on the reception clock generated by the receiver clock generator; and the parallel data converted by the converter. And the command data set in advance, and 3. A comparison unit according to claim 2, further comprising: a comparison unit that outputs the determination result based on the latch clock generated by the latch clock generation unit, and a latch unit that holds the determination result output from the comparison unit based on the latch clock. Monitoring and control system.