JPH0795669A - Remote monitoring controller - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims to improve monitoring and controllability by detecting disconnection abnormality of a transmission line and avoiding a state where remote control is impossible. [Configuration] Remote monitoring control in which a slave station is connected to the master station via a transmission path, a polling signal sent from the master station to the transmission path is received, and a response signal from the slave station is returned to the master station via the transmission path. The device detects the polling signal of the master station (6),
Abnormality determining means (23, 24, 25, 26) for determining the presence or absence of disconnection abnormality in the transmission line (8a) based on the detection cycle of the polling signal from the master station, and the abnormality determination result by the abnormality determining means indicates that there is an abnormality. In case of abnormal signal (Y)
A remote monitoring and control device comprising an abnormality notifying means (26) for outputting

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring and control apparatus in which a remotely located master station and slave station are connected via a transmission line, and particularly when a polling signal does not reach the slave station.
The present invention relates to a distant monitoring control device capable of improving monitorability and controllability by executing notification of abnormality and switching of control according to a detection cycle of a polling signal.

[0002]

2. Description of the Related Art Generally, control of a control target (terminal device) provided in a remote place is performed by connecting a control output device for controlling the terminal device to a slave station and
A wide range of remote monitoring and control devices that can select either a remote control mode in which a control signal from the master station in the central monitoring center is given to the control output device or a field control mode in which the control output device is controlled independently from the master station can be selected. It is used.

The distant control mode is normally selected, and the site control mode is selected when an abnormality occurs. FIG. 12 is a block diagram showing the configuration of this type of central monitoring center and distant monitoring control device, and FIG. 13 is a block diagram showing the configuration of a slave station. The central monitoring center 1 includes a central monitoring control device 2, a recording device 3, a data storage device 4, a communication control device 5 and a master station 6, which are connected via a common bus 7. The central supervisory control unit 2 is for monitoring and controlling the entire system, totalizing, optimizing in response to the time, day, and the four seasons, and for performing detailed demand forecasting and low-consumption and high-quality optimal operation including various terminal devices. It manages the master station 6. The recording device 3 records information aggregated through the master station 6, and can be, for example, a typewriter. The data storage device 4 stores and stores the total information. Further, the communication control device 5 is for transmitting the total information to the outside.

Here, the master station 6 has the first and second transmission lines 8
a and 8b, each of which is connected to each slave station 10 in a plurality of remote monitoring systems 9 _{1 to} 9 _n provided at a remote place, and a polling signal for calling data is transmitted via a first transmission line 8 a. It has a function of transmitting to the slave stations 10 and also transmitting a control signal to the slave stations 10 based on a response signal returned from each slave station 10 via the second transmission line 8b.

The slave station 10 includes a first transmission path 8a from the master station 6.
To the transmitting circuit 14 based on the polling signal received by the modem 11, the SP (serial-parallel) converter 12 and the receiving circuit 13.
Also, the process detection signal D of the terminal device 17 is fetched from the control output device 16 through the input scanning circuit 15.

Further, the slave station 10 uses the process detection signal D captured by the input scanning circuit 15 as a response signal for the transmission circuit 1.
4 and the PS conversion unit 18 and the modem 19 to send to the second transmission path 8b and transmit to the master station 6.

Further, the slave station 10 sends the control signal C sent back from the master station 6 to the modem 11, S-, as described above.
It is sent to the control output device 16 through the P conversion unit 12, the receiving circuit 13, and the output circuit 20.

Further, the slave station 10 detects an abnormality, as will be described later, based on the signal received from the master station 6 and sends an abnormality output signal E to the control output device 16. Control output device 16
Normally operates in the remote control mode, detects the process amount from the terminal device 17 and sends the process detection signal D to the slave station 10, and controls the terminal device 17 based on the control signal C received from the slave station 10. To do.

When the control output device 16 receives the abnormal output signal E from the slave station 10, the control output device 16 operates in the field control mode and controls the terminal device 17 based on the process amount detected by the terminal device 17.

The shift to the field control mode is performed when any of the following (1) to (3) is satisfied. (1) Control congestion.

The slave station 10 detects, in the data communication text received from the master station 6, an information error such as a communication procedure error or erroneous transmission continuously for a predetermined time or a predetermined number of times. At this time, the control congestion abnormality is detected and the abnormality output signal E is sent to the control output device 16. When the return of the data communication to the normal state is detected, the transmission of the abnormal output signal E is stopped.

(2) Disconnection of control line. When the slave station 10 detects a decrease in the carrier signal level of the first transmission line 8a continuously for a predetermined time while receiving the signal from the master station 6, the slave station 10 detects a control line disconnection abnormality and outputs an abnormality. The signal E is sent to the control output device 16. When the carrier signal level is detected to return to the normal state, the abnormal output signal E is stopped.

(3) Failure of slave station. For example, when the power supply to the slave station 10 is cut off, the fuses mounted on the circuits are broken, or an abnormality is detected by the WDT, the slave station 10 detects a self-abnormality and sends an abnormal output signal E to the control output device 16. In addition,
When returning to the normal state, the output of the abnormal output signal E is stopped.

[0014]

However, in the above-mentioned remote monitoring control device, the first transmission line 8a such as control congestion or control line disconnection is generated based on the signal received from the master station 6.
Therefore, there is a problem that it is impossible to detect an abnormality that does not receive a signal from the master station 6, that is, a disconnection abnormality of the transmission line 8a.

When the control signal C is not received from the master station 6, the slave station 10 cannot update the control signal C to be sent to the process control device 16, so that the process control device 16 always has the same value as the terminal device 17. Will be controlled.

As a result, for example, this remote monitoring control device is applied to a water supply system, and the output of the terminal device 17 controls the number of discharge pressure pumps to be sent to a reservoir located on a high ground or outputs from the reservoir to each home. When adjusting the opening degree of the valve, the water level in the reservoir may rise, which may lead to an unfavorable state.

Also, when it is applied to another control system, the remote control becomes similarly impossible, which may result in an unfavorable state. The present invention has been made in consideration of the above circumstances, and provides a remote monitoring control device capable of improving monitoring performance and controllability by detecting disconnection abnormality of a transmission line and avoiding a state in which remote control is impossible. The purpose is to do.

[0018]

According to a first aspect of the present invention, a slave station is connected to a master station via a transmission path, and the slave station receives a polling signal sent from the master station to the transmission path. In the remote monitoring and control device that returns a response signal from the station to the master station via the transmission path, detects the polling signal of the master station, and relates to the transmission path based on the detection cycle of the polling signal from the master station. The remote monitoring control device includes an abnormality determining unit that determines whether or not there is a disconnection abnormality, and an abnormality notifying unit that outputs an abnormality notifying signal when there is an abnormality as a result of the determination made by the abnormality determining unit.

In the invention according to claim 2, as the abnormality determining means, an abnormal value is generated only once in the detection cycle in synchronization with the turning on of the power so that it is determined that there is an abnormality when the power is turned on. The remote monitoring control device according to claim 1, further comprising a return control unit.

Further, in the invention according to claim 3, a slave station for controlling a controlled object is connected to the master station via the first and second transmission paths, and the master station connects the first transmission path. In the remote monitoring and control device, the slave station executes control based on a polling signal transmitted via the second station, and returns a response signal to the master station via the second transmission path. And a step-by-step abnormality determination means for determining the presence or absence of a light abnormality or a serious abnormality regarding the first transmission line based on the detection cycle of the polling signal from the master station, and the determination by the step-by-step abnormality determination means. As a result, when there is a slight abnormality, the abnormality notification signal is directed to the master station and the second
If there is a serious abnormality as a result of the judgment made by the light abnormality handling means for sending to the transmission line of the above and the stepwise abnormality judging means, a seriousness abnormality generating means generates a control mode switching signal for executing the control by only the slave station. It is a distant monitoring control device provided with abnormality handling means.

In the invention according to claim 4, the slave station is connected to the master station via the first and second transmission paths, and information signals are sequentially transmitted from the slave station via the second transmission path. To the master station, receives a polling signal transmitted from the master station to the first transmission path, and returns a response signal from the slave station to the master station via the second transmission path. In the monitoring and control device, an abnormality determination unit that detects the polling signal of the master station and determines whether or not there is a disconnection abnormality related to the first transmission line based on the detection period of the polling signal from the master station, and this abnormality determination As a result of the judgment by the means, an abnormality notifying means for transmitting an abnormality notifying signal when there is an abnormality, and a signal for transmitting the abnormality notifying signal sent from the abnormality notifying means to the second transmission path by including it in the information signal Remote monitoring with synthetic means A control device.

The invention according to claim 5 further comprises, as the abnormality notifying means, an abnormality signal generating section for generating the abnormality notifying signal composed of a tone signal or a DMTF signal when the abnormality is present. Is a remote monitoring and control device corresponding to.

[0023]

Therefore, in the invention corresponding to claim 1, the above-mentioned means are taken so that the abnormality determining means detects the polling signal of the master station, and based on the detection cycle of the polling signal from the master station. The presence / absence of disconnection abnormality related to the transmission path is determined, and the abnormality notification means outputs an abnormality notification signal when there is an abnormality as a result of the determination by the abnormality determination means. Can be improved.

Further, the invention according to claim 2 is, as the abnormality determining means, a return control for generating an abnormal value only once in a detection cycle in synchronization with power-on so as to determine that there is an abnormality at power-on. Since the unit is provided, the abnormality can be accurately determined regardless of the initial value of the detection cycle when the power is turned on, and the reliability can be improved, in addition to the operation of the first aspect.

Further, in the invention according to claim 3, the staged abnormality determination means detects the polling signal of the master station, and based on the detection cycle of the polling signal from the master station, the lightness related to the first transmission path is reduced. The presence / absence of an abnormality and a serious abnormality is determined, and the light abnormality handling means sends an abnormality notification signal to the second transmission line toward the master station when there is a light abnormality as a result of the determination by the stepwise abnormality determination means. The severe abnormality handling means generates a control mode switching signal for executing the control only by the slave station when there is a serious abnormality as a result of the judgment by the stepwise abnormality judging means, so that the disconnection abnormality of the transmission line is detected. In addition, by avoiding the state in which remote control is impossible, the monitorability and controllability can be improved.

Further, in the invention according to claim 4, the abnormality determining means detects the polling signal of the master station, and based on the detection cycle of the polling signal from the master station, the presence / absence of a disconnection abnormality in the first transmission line. The abnormality notification means sends an abnormality notification signal when there is an abnormality as a result of the determination by the abnormality determination means, and the signal synthesizing means converts the abnormality notification signal sent from the abnormality notification means into an information signal. Since the data is sent to the second transmission path including the data, it is possible to promptly notify the master station of the abnormality.

Furthermore, the invention according to claim 5 further comprises, as the abnormality notifying means, an abnormality signal generating section for generating an abnormality notifying signal composed of a tone signal or a DMTF signal when there is an abnormality. In addition to the effect of 4, it has excellent noise resistance and can improve the certainty of abnormality notification.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a remote monitoring control device and its peripheral configuration according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of a slave station applied to this distant monitoring control device. The same parts as those in FIG. 12 or 13 are designated by the same reference numerals and detailed description thereof will be omitted, but they are different here. Only the part will be described.

That is, the apparatus of this embodiment has a function of detecting a disconnection abnormality of the first transmission line 8a and notifying the abnormality and switching the control output device 16 to the field control mode. 12 and 13 is provided in a stage subsequent to the receiving circuit in the slave station 21 and monitors the call cycle (detection cycle) of the polling signal to detect a call abnormal output signal (abnormality notification signal). Control output device 1 for Y
6, the polling call cycle monitoring unit (abnormality determination unit, abnormality notification unit, recovery control unit) 22 is provided.

Here, the polling call cycle monitoring unit 22
3, the polling signal detection circuit 23 detects the polling signal received by the reception circuit 13 and sends a reset signal to the counter 24 at each detection.

The counter 24 measures the calling period of the polling signal, is connected to an oscillator 25 which generates a clock signal every one second, and counts the clock signal to indicate a period count value. It has a function of sending the count signal to the determination circuit 26 and resetting the cycle count value every time the reset signal is received from the polling signal detection circuit 23.

The judging circuit 26 compares the cycle count signal received from the counter 24 with a predetermined cycle limit value, and when the comparison result indicates that the cycle count signal exceeds the cycle limit value,
The abnormal call output signal Y is sent to the control output device 16.

The control output device 16 includes the determination circuit 14
When the abnormal call output signal Y is received from the terminal device 17 as described above, the remote control mode is switched to the field control mode.
Has the function of controlling.

The return controller 27 sets the cycle limit value in the counter 24 when the power is turned on. next,
The operation of the distant monitoring control apparatus configured as described above is shown in FIG.
This will be described using the time chart of.

Now, in the slave station 21, the polling signal from the master station 6 is detected by the polling signal detecting circuit 23 of the polling call cycle monitoring section 22 via the modem 11, the SP converting section 12 and the receiving circuit 13. .

The polling signal detection circuit 23 sends a reset signal to the counter 24 upon detection of the polling signal (time t1). Upon receiving this reset signal, the counter 24 resets the cycle count value and starts counting. Further, the counter 24 sends a cycle count signal to the determination circuit 26 in accordance with this counting. The determination circuit 26 compares the cycle count signal with the cycle limit value. Since the cycle limit value is larger than the cycle count value, it is determined to be normal and the comparison operation is continued.

Here, the polling signal detection circuit 23 is
The polling signal is detected again, and the reset signal is sent to the counter 24 (time t2). As described above, the counter 24 resets the cycle count value and newly starts counting, and the determination circuit 26 continues the comparison operation.

At this time, it is assumed that the disconnection abnormality occurs in the first transmission line 8a and the polling signal cannot be received (time t3). The determination circuit 26 detects that the cycle count value exceeds the cycle limit value by the comparison operation (time t4), and sends the ringing abnormality output signal Y to the control output device 16.

When the control output device 16 receives the call abnormal output signal Y, the control output device 16 switches from the remote control mode to the site control mode to control the terminal device 7. In addition, the first transmission line 8a
When the disconnection abnormality of is recovered (time t5), the polling signal detection circuit 23 receives the polling signal from the master station 6 and resets the counter 24 (time t6).

As a result, the determination circuit 26 detects that the cycle count value has become smaller than the cycle limit value, and stops sending the abnormal call output signal Y to the control output device 16.
Since the control output device 16 does not receive the abnormal call output signal Y, it returns from the site control mode to the remote control mode and controls the terminal device 17 based on the control signal C received from the master station 6 through the slave station 21.

In this operation, if the power of the slave station 21 is cut off in connection with the abnormality detection and the power is turned on after the abnormality is resolved, the return controller 27 causes the counter 24 to operate at the time of turning on the power. Set the cycle limit value.

Since the counter 24 updates the cycle count value with at least the cycle limit value as an initial value, the determination circuit 26 determines that the cycle count value has exceeded the cycle limit value, and sends out the ringing abnormality output signal Y.

However, since the abnormality has been resolved, the polling signal detection circuit 23 detects the polling signal after a lapse of a short time, so that the transmission of the calling abnormality output signal Y is stopped and the normal state is restored. .

As described above, according to the first embodiment, the polling signal detection circuit 23 detects the polling signal of the master station 6, and the determination circuit 26 transmits it based on the detection cycle of the polling signal from the master station 6. Since the presence / absence of a disconnection abnormality regarding the line 8a is determined and the abnormal call output signal Y is output when there is an abnormality, it is possible to detect the disconnection abnormality of the transmission line and improve the monitorability.

Further, according to the present embodiment, the recovery control unit 27 is provided for generating an abnormal value only once in the detection cycle in synchronism with the turning on of the power so that it is judged that there is an abnormality when the power is turned on. The abnormality can be accurately determined regardless of the initial value of the detection cycle when the power is turned on, and the reliability can be improved.

Next, a remote supervisory control device according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a block diagram showing the configuration of a slave station applied to this remote monitoring and control apparatus, and FIG. 6 is a block diagram showing the configuration of a polling call cycle monitoring unit of this slave station. The same reference numerals are given to the same portions as those and detailed description thereof will be omitted, and only different portions will be described here.

That is, the apparatus of this embodiment detects a light abnormality and a serious abnormality based on the detection cycle of the polling signal. Specifically, the apparatus shown in FIGS. Instead of the cycle monitoring unit 22, a polling call cycle monitoring unit 29 in which a light abnormality determination circuit 28 is added after the counter 24 is provided.

Here, the light abnormality determination circuit 28 stores a preliminary limit value corresponding to a cycle shorter than the cycle limit value of the apparatus shown in FIG. 1 as a cycle limit value for light abnormality determination. And the cycle count signal received from the counter 24 are compared, and as a result of this comparison, when the cycle count signal indicates that the preliminary limit value has been exceeded (there is a slight abnormality), the ringing abnormality notification signal H is output to the control output device 16 It has a function to send to.

Therefore, as shown in FIG. 7, when the cycle count signal from the counter exceeds the preliminary limit value at time t7, the call abnormality notification signal H is sent from the light abnormality determination circuit 28 to the control output device 16. When the control output device 16 receives the call abnormality notification signal H, it emits a buzzer or a bell and displays an abnormality by a lamp to notify the operator of the abnormality and urge the operator to return to the normal state.

When the normal state is not restored, the cycle count signal is continuously updated by the counter 24, and at time t8, when the cycle count signal exceeds the cycle limit value of the determination circuit 24 described above (there is a serious abnormality), The determination circuit 24 sends a ringing abnormality output signal Y (control mode switching signal) to the control output device 16.

When the control output device 16 receives the call abnormality output signal Y, it switches from the remote control mode to the site control mode to control the terminal device 17. As described above, according to the second embodiment, the polling call cycle monitoring unit 29 detects the polling signal of the master station 6, and based on the detection cycle of the polling signal from the master station 6, the light abnormality and the serious abnormality. If there is a slight abnormality, a call abnormality notification signal H is sent to the control output device 16 to notify the operator of the abnormality, and if there is a serious abnormality, control is performed only by the slave station 21. Since the abnormal call output signal Y is sent to the control output device 16, it is possible to improve the monitorability and controllability by detecting the disconnection abnormality of the transmission path and avoiding the state in which remote control is impossible. You can

Next, a remote monitoring control device according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a block diagram showing the configuration of a slave station applied to this remote monitoring and control apparatus. The same parts as those in FIG. 5 are designated by the same reference numerals and detailed description thereof will be omitted, and only different parts will be described here. .

That is, in the apparatus of this embodiment, the slave station is often unmanned because it is installed in a relatively remote place such as a hill, and the master station is often manned because it has a central supervisory control device. In consideration of the actual situation, in order to increase the certainty of dealing with the abnormality, the function of transmitting the call abnormality notification signal to the master station where the operator is surely added is added to the second embodiment. In the configuration shown in FIG. 6, the transmission circuit 14 is also provided with a call abnormality notification signal H output from the polling call cycle monitoring unit 29 to the control output device 16.

Here, the abnormal call notification signal H is sent from the transmission circuit 4 to the master station 6 via the PS converter 18 and the modem 19.
Sent to. Upon receiving the call abnormality notification signal H, the master station 6 issues a buzzer or bell sound and a lamp abnormality display in the same manner as described above to notify the operator of the abnormality and urge the operator to return to the normal state.

As described above, in the third embodiment, as compared with the second embodiment, the call abnormality notification signal H output from the polling call cycle monitoring unit 29 to the control output device 16 is transmitted via the transmission circuit 14 to the master. Since the function of transmitting to the station 6 is added, in addition to the effect of the second embodiment, since the abnormality is surely notified to the master station where the operator is present, the reliability of the response to the abnormality can be improved. it can.

Next, a remote monitoring control device according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a block diagram showing a schematic configuration of this remote monitoring control device,
The same parts as those in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted, and only different parts will be described here.

That is, the apparatus of this embodiment has a function of reliably transmitting the process detection signal D indicating the process amount to the master station 6, and more specifically, a plurality of slave stations 21 _{1 to} 21 _n are used by the master station 6.
The process detection signal D is sequentially and cyclically transmitted to the master station 6 without receiving the polling signal from the master station 6.

As a result, the process detection signal D can be received by the master station 6 even if there is a failure in the transmission path 8a transmitted from the master station 6 to the slave station 21. Further, when the slave station 21 receives the polling signal, as shown in FIG. 10, the transmission of the process detection signal D is immediately interrupted, and a response signal to this polling signal is transmitted from the head text to the master station 6. That is, since the polling signal is received while the text corresponding to the third text in FIG. 10 is being transmitted, the third text is cut off midway. And 1 at the beginning of the text
Resume sending from the th text.

As a result, the master station 6 can receive the response signal (desired process detection signal D) with the shortest time lag after transmitting the polling signal. Further, when the detection period of the polling signal exceeds the predetermined preliminary limit value, the slave station 21 detects the call abnormality and immediately transmits the call abnormality notification signal H from the first text as described above. The parent station 6 can be notified with the shortest time lag.

As described above, according to the fourth embodiment, even if the slave station 21 does not receive the polling signal from the master station 6, the slave station 21 sequentially and cyclically transmits the process detection signal D to the master station 6. , The transmission path 8 from the master station 6 to the slave station 21
Even if there is a failure in a, the process detection signal D can be received by the master station.

Further, according to the present embodiment, when the slave station 21 detects a call abnormality, the transmission of the process detection signal D is immediately interrupted and the call abnormality notification signal H is transmitted from the first text. The parent station can be notified with a time lag of.

Next, a remote monitoring control device according to a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a block diagram showing the configuration of a slave station applied to this distant monitoring control apparatus. The same parts as those in FIG. 5 are designated by the same reference numerals and detailed description thereof will be omitted, and only different parts will be described here. .

That is, the device of this embodiment is applied to the device shown in FIG. 9 to further improve the certainty of abnormality notification. Specifically, the device shown in FIG. Based on the call abnormality notification signal H output from the monitoring unit 29 to the control output device 16, for example, 500 Hz
Of the tone signal transmitting circuit (abnormal signal creating section) 31 for transmitting the tone signal of No. 1 and the tone signal transmitted from the tone signal transmitting circuit 31 are included in the process detection signal (information signal) D transmitted from the modem 19. And a signal synthesizing circuit 32 for transmitting to the master station 6. The process detection signal D has a frequency about three times that of the tone signal.

As a result, when the ringing abnormality notification signal H is generated, the tone signal generated based on the ringing abnormality notification signal H is included in the process detection signal D and transmitted to the master station 6. A call abnormality can be promptly notified without waiting for the completion of the transmission of D.

Further, as the call abnormality notification signal H, a tone signal, which is more excellent in noise resistance than the information signal, is used as the call abnormality notification signal H, so that the call abnormality can be reliably notified.

As described above, according to the fifth embodiment, the polling call cycle monitoring unit 29 detects the call abnormality and sends out the call abnormality notification signal H, and the tone signal transmission circuit 31 outputs the call abnormality notification signal H. Since it is formed as a tone signal and the signal synthesizing circuit 32 sends the tone signal to the master station 6 by including it in the process detection signal D, it is possible to promptly notify the master station of a ringing abnormality, and with excellent noise resistance. The reliability of the abnormality notification can be improved.

In the fifth embodiment, the case where the tone signal having one frequency is used has been described. However, the present invention is not limited to this, and the present invention can be applied even if a DMTF signal having two or more frequencies is used. The same effect can be obtained by carrying out similarly. In addition, the present invention can be modified in various ways without departing from the scope of the invention.

[0068]

As described above, according to the first aspect of the invention, the abnormality determining means detects the polling signal of the master station, and based on the detection cycle of the polling signal from the master station, the disconnection abnormality relating to the transmission path. If there is an abnormality as a result of the determination made by the abnormality determining means, the abnormality notifying means outputs an abnormality notifying signal, so that a disconnection abnormality of the transmission path can be detected and remote monitoring control can improve the monitorability. A device can be provided.

Further, the invention according to claim 2 is, as the abnormality judging means, a return control for generating an abnormal value only once in a detection cycle in synchronization with the turning on of the power so as to judge that there is an abnormality when the power is turned on. In addition to the function of claim 1, since the unit is provided, it is possible to accurately determine the abnormality regardless of the initial value of the detection cycle when the power is turned on, and thus to provide the remote monitoring control device that can improve reliability. it can.

Further, in the invention according to claim 3, the staged abnormality determination means detects the polling signal of the master station, and based on the detection cycle of the polling signal from the master station, the lightness related to the first transmission path is reduced. The presence / absence of an abnormality and a serious abnormality is determined, and the light abnormality handling means sends an abnormality notification signal to the second transmission line toward the master station when there is a light abnormality as a result of the determination by the stepwise abnormality determination means. The severe abnormality handling means generates a control mode switching signal for executing the control only by the slave station when there is a serious abnormality as a result of the judgment by the stepwise abnormality judging means, so that the disconnection abnormality of the transmission line is detected. In addition, it is possible to provide a distant monitoring control device capable of improving monitoring performance and controllability by avoiding a state where remote control is impossible.

Further, in the invention according to claim 4, the abnormality determining means detects the polling signal of the master station, and based on the detection cycle of the polling signal from the master station, the presence / absence of a disconnection abnormality relating to the first transmission line. The abnormality notification means sends an abnormality notification signal when there is an abnormality as a result of the determination by the abnormality determination means, and the signal synthesizing means converts the abnormality notification signal sent from the abnormality notification means into an information signal. Since the data is sent to the second transmission path including the data, it is possible to provide a remote monitoring control device capable of promptly notifying the master station of an abnormality.

Furthermore, the invention according to claim 5 further comprises, as the abnormality notifying means, an abnormality signal generating section for generating an abnormality notifying signal composed of a tone signal or a DMTF signal when there is an abnormality. In addition to the effect of 4, it is possible to provide a remote monitoring control device that has excellent noise resistance and can improve the certainty of abnormality notification.

[Brief description of drawings]

FIG. 1 is a block diagram showing a remote monitoring control device and its peripheral configuration according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a slave station in the embodiment.

FIG. 3 is a block diagram showing a configuration of a polling call cycle monitoring unit in the embodiment.

FIG. 4 is a time chart for explaining the operation in the embodiment.

FIG. 5 is a block diagram showing a configuration of a slave station applied to a remote monitoring control device according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing the configuration of a polling call cycle monitoring unit in the embodiment.

FIG. 7 is a time chart for explaining the operation in the embodiment.

FIG. 8 is a block diagram showing a configuration of a slave station applied to a remote monitoring control device according to a third embodiment of the present invention.

FIG. 9 is a block diagram showing a schematic configuration of a remote monitoring control device according to a fourth embodiment of the present invention.

FIG. 10 is a time chart for explaining the operation in the embodiment.

FIG. 11 is a block diagram showing a configuration of a slave station applied to a remote monitoring control device according to a fifth embodiment of the present invention.

FIG. 12 is a block diagram showing the configurations of a conventional central monitoring center and distant monitoring control device.

FIG. 13 is a block diagram showing a configuration of a slave station applied to a conventional distant monitoring control apparatus.

[Explanation of symbols]

6 ... Master station, 8a ... First transmission line, 8b ... Second transmission line,
16 ... Process control output device, 21 ... Slave station, 22, 29
... polling call cycle monitoring unit, 23 ... polling signal detection circuit, 24 ... counter, 25 ... oscillator, 26 ... determination circuit, 27 ... recovery control unit, 28 ... light abnormality determination circuit, 31 ...
Tone signal transmitting circuit, 32 ... Signal combining circuit, Y ... Ringing abnormality output signal, H ... Ringing abnormality notification signal.

Claims (5)

[Claims] 1. A master station is connected to a slave station via a transmission path, receives a polling signal sent from the master station to the transmission path, and receives a response signal from the slave station via the transmission path to the master station. In the remote monitoring and control device for returning to the station, the polling signal of the master station is detected, and abnormality determining means for determining the presence or absence of disconnection abnormality regarding the transmission line based on the detection period of the polling signal from the master station, A distant monitoring control device comprising: an abnormality notification unit that outputs an abnormality notification signal when there is an abnormality as a result of the determination by the abnormality determination unit. 2. The abnormality determination means comprises a return control unit for generating an abnormal value only once in the detection cycle in synchronization with the power-on so as to determine that there is an abnormality when the power is turned on. The remote monitoring and control device according to claim 1. 3. A master station is connected to a slave station for controlling a control target via first and second transmission lines, and the master station connects the first station to the first station.
The slave station executes control based on a polling signal sent through the transmission line of the second transmission line, and sends a response signal to the second transmission line.
In the remote monitoring and control device that returns the data to the master station via the transmission path of, the polling signal of the master station is detected, and based on the detection cycle of the polling signal from the master station, If there is a slight abnormality as a result of the judgment by the step-by-step abnormality judging means for judging the presence or absence of abnormality and serious abnormality, an abnormality notification signal is sent to the master station to the second transmission path. A light abnormality handling means for sending out, and a serious abnormality handling means for generating a control mode switching signal for executing the control by only the slave station when there is a serious abnormality as a result of the determination by the stepwise abnormality determining means, A distant monitoring and control device comprising: 4. A slave station is connected to the master station via first and second transmission paths, and information signals are sequentially sent from the slave station to the master station via the second transmission path. From the parent station to the first
In the remote monitoring and control device that receives a polling signal sent to the transmission path of, and returns a response signal from the slave station to the master station via the second transmission path, detects the polling signal of the master station, Abnormality determining means for determining whether or not there is a disconnection abnormality related to the first transmission line based on the detection cycle of the polling signal from the master station; and an abnormality notification signal when there is abnormality as a result of the determination by the abnormality determining means. A remote monitoring control device comprising: an abnormality notifying means for sending out; and a signal synthesizing means for sending the abnormality notifying signal sent out from the abnormality notifying means to the second transmission path by including it in the information signal. . 5. The distant monitoring control according to claim 4, wherein the abnormality notifying means includes an abnormality signal creating section that creates the abnormality notifying signal composed of a tone signal or a DMTF signal when the abnormality is present. apparatus.