JP3199971B2 - Time program setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention transmits a 24-hour time program such as a water supply amount of a water supply system from a high-order computer to a low-order data reading device, and causes a lower-order device to execute the time program. The present invention relates to a time program setting device, and more particularly to a time program setting device capable of reducing the frequency of occurrence of abnormalities by compressing / expanding a time program and correcting the time.

[0002]

2. Description of the Related Art Generally, in the field of controlling a water supply pump or the like in accordance with a time program in units of 24 hours, such as a water supply system, a computer in which a time program is set and a data reading device for reading the time program are provided. Are widely used.

FIG. 3 is a block diagram showing the configuration of this type of time program setting device. In this time program setting device, the computer 1 has a 24-hour program setting circuit 2 and a read signal transmission circuit 3, and the data reading device 4 has a set value holding circuit 5.

Here, a 24-hour program setting circuit 2
As shown in FIG. 4 (a), 24
When a time program indicating a change in the set value over time is set, the set value corresponding to the current time is sequentially transmitted to the set value holding circuit 5 during 24 hours as a program setting signal from the time program. The program setting signal may be, for example, 4 to 20 mA DC or 1 to 4 mA.
A 5V analog signal is used.

[0005] The read signal transmission circuit 3 is shown in FIG.
As shown in (1), a read signal as a strobe signal is transmitted to the set value holding circuit 5 at a constant period. On the other hand, when receiving the read signal from the read signal generating circuit 3, the set value holding circuit 5 reads the program setting signal transmitted from the 24-hour program setting circuit 2 as shown in FIG. The set value is updated by the set signal, and the updated result is output to a control target (not shown) as a set value signal. The set value holding signal keeps holding the current set value when the read signal is not received.

[0006]

However, in the time program setting device as described above, if the read signal is not transmitted due to the failure of the computer 1 as shown in FIG. There is a problem that the set value becomes abnormal as time elapses due to the holding state.

[0007] In addition, this problem occurs frequently because transmission is performed for 24 hours, and reduces reliability. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and a time program setting that can reduce the frequency of occurrence of abnormalities in transmission processing and improve reliability by compressing and transmitting a time program and expanding and reproducing the time program. It is intended to provide a device.

[0008]

According to a first aspect of the present invention, there is provided an analog signal indicating a change in a set value in a predetermined period.
A computer set time program by, at the time a program setting apparatus that includes a data reading device for outputting the current setting value based on the current time and set time programmed into the computer, the computer, the A compression program creating means for creating a compression program by an analog signal obtained by compressing the time axis of the time program , transmitting the compression program in analog form, a current time in the data reading device and a current time in the computer. Analog signal transmission means for transmitting a correction signal for synchronizing the time with the time;
While the transmission start timing is instructed, the data reading device
The compressed program receiving means is stored in the
Transmission timing notifying means for notifying the timing ,
The data reading device receives the compressed program transmitted in analog form from the compressed program creating means, expands the compressed program and reproduces the original time program, and the time program reproducing means and the correction signal transmitting means. Receiving the time correction signal, and correcting the current time in the data reading device based on the time correction signal; and reproducing the time program based on the current time corrected by the time correction means. A setting value reading means for reading the current setting value from the time program reproduced by the means.

[0009]

[0010]

[Action] Therefore, by the invention corresponding to claim 1 which took measures as described above, a computer, the compression program creating means compresses the time axis of the time program Ana
A compression program based on a log signal is created, the compression program is transmitted in an analog manner, and the correction signal sending means transmits a time correction signal for matching the current time in the data reader with the current time in the computer, and transmits the signal. Ta
The notifying means sends analog data to the compression program
Data transmission start timing.
The compressed program receiving means is stored in the
In the data reading device , the data reading device receives the compressed program analog-transmitted from the compressed program creating unit, the time program reproducing unit expands the compressed program to reproduce the original time program, and the time correcting unit Receiving the time correction signal transmitted from the correction signal transmitting means, correcting the current time in the data reader based on the time correction signal, and setting the value reading means to correct the current time corrected by the time correction means. Since the current set value is read from the time program reproduced by the time program reproducing means based on the time, the frequency of occurrence of abnormalities relating to the transmission process is reduced by compressing and transmitting the time program and expanding and reproducing the time program. And reliability can be improved.

The transmission timing notifying means instructs the compression program creating means to start analog transmission, while notifying the time program reproducing means of the data reader of the reception timing of the compression program.
Thus, the reliability of the transmission operation can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a time program setting device according to one embodiment of the present invention. In the time program setting device, the computer 10 and the data reading device 20 are connected to each other as described above.

The computer 10 has a 24-hour program setting circuit 11, a transmission start signal transmission circuit 12, a time reduction circuit 13, and a time correction circuit 14. On the other hand, the data reading device 20 includes a data reading circuit 21, a time enlarging circuit 22, and a set value detecting circuit 23.

The 24-hour program setting circuit 11 supplies the time program to the time shortening circuit 13 when a time program indicating a change of the set value in units of 24 hours is set by the operation of the operator.

The transmission start signal transmission circuit 12 has a function of giving a transmission start signal for instructing the start timing of analog transmission to the time shortening circuit 13. The time shortening circuit 13 creates a compressed program that can be transmitted in a short time by compressing the time program given from the 24-hour program setting circuit 11, and receives the transmission start signal from the transmission start signal transmission circuit 12. Is transmitted to the data reading circuit 21 in an analog manner. As described above, the compression program setting signal may be, for example, 4 to 20 mA DC or 1 DC.
An analog signal of ~ 5V is used.

The transmission start signal transmission circuit 12 has a function of giving a transmission start signal to the data reading circuit 21 for notifying the reception timing of the compression program setting signal.

The time correction circuit 14 generates a time signal indicating the time. The time correction circuit 14 outputs a time correction signal at a predetermined time based on the time signal generated from the clock circuit 15 to the data reading circuit 21 and the set value. And a time detection circuit 16 to be sent to the detection circuit 23.

When the data reading circuit 21 receives the transmission start signal from the transmission start signal generating circuit 12, the data reading circuit 21
3 has a function of reading a compression program setting signal transmitted in an analog manner from 3 and giving the compression program setting signal to the time enlarging circuit 22. Further, when receiving the time correction signal from the time correction circuit 14, the data reading circuit 21 has a function of correcting the current time based on the time correction signal.

The time expanding circuit 22 includes a data reading circuit 21
When the compression program setting signal is supplied from the CPU, the compression program setting signal is expanded to reproduce the original time program, and a 24-hour program setting signal indicating the time program is supplied to the set value detection circuit 23.

The set value detection circuit 23 includes a time expansion circuit 22
Has a function of detecting a set value corresponding to the current time from a 24-hour program setting signal provided from the control unit, and outputting a detection result as a set value signal to a control target (not shown). Further, when the set value detection circuit 23 receives a time correction signal from the time correction circuit 14, it has a function of correcting the current time based on the time correction signal.

Next, the operation of the time program setting device configured as described above will be described with reference to FIG. Now 2
When a time program in units of 24 hours is set by the operation of the operator, the 4-hour program setting circuit 11 gives the time program to the time reduction circuit 13. Also,
The transmission start signal transmission circuit 12 supplies the transmission start signal to the time reduction circuit 13 and the data reading circuit 21.

The time shortening circuit 13 creates a compression program by compressing the time program, and thereafter, upon receiving a transmission start signal, transmits the compression program setting signal to the data reading circuit 21 by analog transmission.

When receiving the transmission start signal, the data reading circuit 21 reads the analog transmitted compressed program setting signal and supplies the compressed program setting signal to the time enlarging circuit 22.

The time expansion circuit 22 expands the compressed program setting signal to reproduce the original time program, and sends a 24-hour program setting signal indicating the time program to the set value detecting circuit 23.

The set value detecting circuit 23 detects a set value corresponding to the current time from the 24-hour program setting signal, and outputs the detection result to the control object as a set value signal.
The time correction circuit 14 sends a time correction signal to the set value detection circuit 23 about once a day. The set value detection circuit 23 corrects the current time based on the time correction signal.

As described above, according to the present embodiment, in the computer 10, the time shortening circuit 13 creates a compression program by compressing the time program, and transmits a compression program setting signal indicating the compression program by analog transmission. The time correction circuit 14 transmits a time correction signal for matching the current time in the data reading device 20 with the current time in the computer. In the data reading device 20, the data reading circuit 21 Upon receiving the transmitted compressed program setting signal, the time expanding circuit 22 expands the compressed program setting signal, reproduces the original time program, sends out a 24-hour program setting signal indicating this time program, and detects the set value. The circuit 23 receives the time adjustment signal transmitted from the time adjustment circuit 14, and based on the time adjustment signal. Since the current time in the data reading device 20 is corrected and the current setting value is read from the 24-hour program setting signal sent from the time enlarging circuit 22 based on the corrected current time, the time program is read. By compressing and transmitting, and expanding and reproducing,
The frequency of occurrence of abnormalities related to transmission processing can be reduced, and reliability can be improved.

The transmission start signal transmission circuit 12 instructs the time reduction circuit 13 to start analog transmission, and notifies the data reading circuit 21 of the data reading device 20 of the reception timing of the compressed program. Can be improved.

Further, after the time enlarging circuit 22 gives the 24-hour program setting signal to the setting value detecting circuit 23, the current setting value can always be output by using the 24-hour program setting signal. It is possible to avoid the setting value holding state at the time of a computer failure, thereby improving the safety of the plant.

Also, unlike the conventional case, the time program in units of 24 hours is transmitted in a short time, so that the frequency of occurrence of an abnormal state can be reduced. Further, by adopting such short-time transmission, it becomes possible to reduce the load on the host computer and to divert the transmission line to other uses.

Further, since the conventional analog transmission system can be used, existing equipment can be easily adopted and long-distance transmission can be supported. In the above-described embodiment, the case where the time program of the 24-hour unit is used has been described. However, the present invention is not limited to this. However, the present invention can be implemented in the same manner and the same effect can be obtained. In addition, the present invention can be implemented with various modifications without departing from the scope of the invention.

[0031]

As described above, according to the first aspect of the present invention, in the computer, the compression program creating means creates a compression program based on an analog signal obtained by compressing the time axis of the time program. Analog transmission, the correction signal sending means transmits a time correction signal for matching the current time in the data reader and the current time in the computer, the transmission timing notifying means,
Start of analog transmission to compression program creation means
While reading the time program of the data reader.
The data reading apparatus receives the compressed program transmitted in analog form from the compressed program creating means, and the time program reproducing means decompresses the compressed program to convert the original time program to the original time program. Reproducing, the time correction means receives the time correction signal transmitted from the correction signal sending means, corrects the current time in the data reading device based on the time correction signal, and the set value reading means corrects the time correction. The current setting value is read from the time program reproduced by the time program reproducing means on the basis of the current time corrected by the means. It is possible to provide a time program setting device capable of reducing the frequency of occurrence of abnormalities related to and improving reliability.

The transmission timing notifying means instructs the compression program creating means to start analog transmission, while notifying the time program reproducing means of the data reader of the reception timing of the compression program.
In, Ru can improve the reliability of a transmission operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a time program setting device according to an embodiment of the present invention;

FIG. 2 is a block diagram for explaining an operation in the embodiment;

FIG. 3 is a block diagram showing a configuration of a conventional time program setting device;

FIG. 4 is a time chart for explaining the operation of the conventional time program setting device,

FIG. 5 is a time chart for explaining the operation of a conventional time program setting device.

[Explanation of symbols]

10: Computer, 11: 24-hour program setting circuit, 1
2 ... transmission start signal transmission circuit, 13 ... time reduction circuit, 14
... time correction circuit, 15 ... clock circuit, 16 ... time detection circuit, 20 ... data reading device, 21 ... data reading circuit, 2
2 ... time expansion circuit, 23 ... set value detection circuit.

Claims (1)

(57) [Claims] 1. An alarm indicating a change in a set value during a predetermined period.
A time program setting device comprising: a computer in which a time program is set by a analog signal; and a data reading device that outputs a current time and a current setting value based on the time program set in the computer. , The time axis of the time program is compressed into an analog signal
Create a by compression program, a compression program creating means for the compressed program analog transmission, correction signal transmitting transmits the time correction signals for matching the current time at the current time and said computer in said data reader means and, starting Thailand analog transmission to said compression program creating means
While the data reading device is
The reception timing of the compressed program to the
The data reading device receives the compressed program analog-transmitted from the compressed program creating means, expands the compressed program and reproduces the original time program. Means for receiving a time correction signal transmitted from the correction signal sending means, and correcting the current time in the data reading device based on the time correction signal; A time program setting device, comprising: a set value reading means for reading the current set value from a time program reproduced by the time program reproducing means based on a current time.