JP2017103505A - Remote monitoring control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote monitoring control device that can transmit many measurement items even by low-speed communication, and restore a current measurement value if a reception side loses the current measurement value.SOLUTION: In a remote monitoring control device, a master station A and a slave station B are connected via a network 40, and the slave station B transmits a plurality of measurement values to the master station A. The remote monitoring control device monitors measurement values at a first constant cycle T, performs deviation time transmission to transmit measurement values of this time from the slave station B to the master station A when difference between the measurement values of this time and measurement values transmitted the last time deviates from a first setting value D for deviation monitoring determined for each measurement item, and further transmits measurement values of all the measurement items from the slave station B to the master station A at a second constant cycle T0.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a remote monitoring control apparatus that monitors and controls equipment located far away.

In the power generation / transformation equipment, the centralized monitoring of each device of the slave station is performed at a remote monitoring control station (master station). In order to reduce the transmission load, the remote monitoring and control device adopts a system that transmits the measured value only when the difference between the current measured value and the previous measured value deviates from the set value, and repeats this at a constant cycle Is disclosed (for example, Patent Document 1).
In addition, a method is disclosed in which a measurement value is constantly transmitted at a constant cycle, a transmission data amount is monitored, and when a certain value is exceeded, the load is reduced by extending the transmission cycle (for example, Patent Document 2).

JP-A 63-266998 (page 2, lower right to page 3, upper left, FIG. 1, FIG. 2) JP-A-9-54738 (paragraphs [0009], [0010], [0021], FIG. 1)

  However, in the invention disclosed in Patent Document 1, since transmission is not performed if the difference between the measurement values is within the set value range, if the master station side loses the current measurement value due to some factor of the network or the master station, it cannot be recovered. There is. Further, in the invention disclosed in Patent Document 2, when transmission from a plurality of slave stations competes and the load on the network increases, only a specific slave station continues to transmit in a short cycle, and other slave stations have a long cycle. There is a problem that it may remain.

  The present invention has been made to solve the above-described problems, and can transmit multi-measurement items even in low-speed communication, and recovers measurement values even when the receiving side loses the current measurement values. An object of the present invention is to provide a remote monitoring and control device that can perform the above operation.

  The remote monitoring control device according to the present invention is a remote monitoring control device in which a master station and a slave station are connected via a network, and a plurality of measurement values are transmitted from the slave station to the master station. When the difference between the current measurement value and the previously transmitted measurement value deviates from the first set value for deviation monitoring provided for each measurement item, the current measurement value is transmitted from the slave station to the master station. The transmission at the time of departure is performed, and the measurement values of all the measurement items are transmitted from the slave station to the master station at the second fixed period.

  According to the remote monitoring and control device of the present invention, the measured value is monitored at the first fixed period, and when the first set value is deviated, the measured value is transmitted from the slave station to the master station. Is transmitted from the slave station to the master station at the second fixed cycle, so that multiple measurement items can be transmitted even at low-speed communication, and the measured value can be recovered even if the receiving side loses the current measured value. Can do.

It is a block diagram which concerns on the remote monitoring control apparatus of Embodiment 1 of this invention. It is operation | movement explanatory drawing which concerns on the remote monitoring control apparatus of Embodiment 1 of this invention. It is operation | movement explanatory drawing which concerns on the remote monitoring control apparatus of Embodiment 1 of this invention. It is operation | movement explanatory drawing which concerns on the remote monitoring control apparatus of Embodiment 2 of this invention. It is a block diagram which concerns on the remote monitoring control apparatus of Embodiment 3 of this invention. It is operation | movement explanatory drawing which concerns on the remote monitoring control apparatus of Embodiment 3 of this invention. It is a block diagram which concerns on the remote monitoring control apparatus of Embodiment 4 of this invention. It is operation | movement explanatory drawing which concerns on the distant monitoring control apparatus of Embodiment 4 of this invention. It is a block diagram which concerns on the distant monitoring control apparatus of Embodiment 5 of this invention.

Embodiment 1 FIG.
In the first embodiment, the measurement value is monitored at the period T, and when the difference between the current measurement value and the measurement value transmitted last time deviates from the set value D provided for each measurement item, The present invention relates to a remote monitoring and control device that performs transmission at the time of departure transmitted from a station to a master station, and further transmits measurement values of all measurement items from the slave station to the master station at a constant period T0.

  Hereinafter, the configuration and operation of the remote monitoring control device 100 according to Embodiment 1 of the present invention will be described based on FIG. 1 which is a block diagram of the remote monitoring control device and FIGS. 2 and 3 which are operation explanatory diagrams.

FIG. 1 shows the configuration of the entire system including a master station A and a slave station B of the remote monitoring control apparatus 100 according to the first embodiment of the present invention.
2 and 3 are operation explanatory diagrams expressed in time series in order to explain processing mainly performed in the slave station B of the remote monitoring control apparatus 100 according to the first embodiment of the present invention.

First, based on FIG. 1, the system configuration | structure of the remote monitoring control apparatus 100 of Embodiment 1 of this invention and the function of each part are demonstrated.
The remote monitoring and control apparatus 100 includes a master station A and a plurality of slave stations B1 to Bn. The master station A and the plurality of slave stations B1 to Bn are connected by a network 40. Note that the slave stations B1 to Bn are appropriately described as slave stations B when it is not necessary to distinguish them.

The master station A includes a master station transmission processing unit 11, a reception history management unit 12, and a master station setting value management unit 13.
The master station transmission processing unit 11 receives the fixed-cycle transmission data and the deviation transmission data to be described after being transmitted from the slave station transmission processing unit 21 of each of the slave stations B1 to Bn, and sends it to the reception history management unit 12 Notice. The reception history management unit 12 stores the periodic transmission data and deviation transmission data received from the master station transmission processing unit 11 and manages them as a history. The master station set value management unit 13 centrally manages the periods T and T0 of each of the slave stations B1 to Bn and the set value D of each measurement item, and transfers them to each of the slave stations B1 to Bn when necessary.
Here, the period T is a period in which the slave station B performs deviation monitoring of measured values. The period T0 is a period in which the measurement values of all measurement items are transmitted from the slave station B to the master station A. Further, the set value D is a management value (deviation monitoring allowable value width) when monitoring the deviation of the measured value.

The slave station B includes a slave station transmission processing unit 21, a measurement value deviation monitoring unit 22, a transmission value management unit 23, a slave station set value management unit 24, and a measurement value input unit 25.
The slave station transmission processing unit 21 transmits the measurement value deviating from the set value D from the measurement value deviation monitoring unit 22 to the master station A in a cycle T. Further, the slave station transmission processing unit 21 transmits all measured values of the slave stations to the master station A at a period T0.
The measured value deviation monitoring unit 22 compares the measured value from the measured value input unit 25 with the previous transmission value and monitors the deviation from the set value D. When deviating, the measured value is notified to the slave station transmission processing unit 21. This process is repeated at period T.
The transmission value management unit 23 stores and manages the measurement values transmitted from the slave station transmission processing unit 21 to the master station A.
The slave station set value management unit 24 manages the slave station cycles T and T0 and the set value D of each measurement item.
The measurement value input unit 25 inputs the physical quantity of each measurement item to be monitored from each measurement device 31 and converts it into measurement value data.

  Normally, in the remote monitoring control apparatus, the status of various devices in the slave station B and failure signals are also transmitted from the slave station B to the master station A. Control signals for controlling various devices of the slave station B are transmitted from the master station A to the slave station B. Since the present invention relates to the deviation monitoring of measured values, the processing of various devices in the slave station B and the processing of fault signals and the processing of control signals for controlling the various devices of the slave station B are omitted.

Next, based on FIG. 2, 3, it is a figure explaining operation | movement of the remote monitoring control apparatus 100 of Embodiment 1 of this invention.
FIG. 2 explains the basic processing method of the measurement value deviation monitoring. In the slave station B, the deviation of the measured value is monitored at the timing of the period T. If the measured value deviates from the set value D, which is the management value centering on the measured value transmitted from the slave station B to the master station A, at the timing of deviation monitoring, the measured value is transferred from the slave station B to the master station B. Transmitting to station A.
For example, since the measurement value at the departure monitoring timing t1 deviates from the set value D on the basis of the measurement value transmitted from the slave station B to the parent station A at the departure monitoring timing t0, the measurement value at the timing t1. Is transmitted from the slave station B to the master station A. At the departure monitoring timing t3, the measurement value at this timing does not deviate from the set value D on the basis of the measurement value transmitted from the slave station B to the master station A at the timing t2. Measurement values are not transmitted to station A.
At the deviation monitoring timing t4, the measurement value at this timing is deviated from the set value D with reference to the measurement value transmitted from the slave station B to the master station A at the timing t2. The data is transmitted from the slave station B to the master station A.
A set value D for deviation monitoring is individually provided for each measurement item. This is because the deviation monitoring set value D is individually provided for each measurement item, thereby enabling appropriate monitoring according to the degree of change of the measurement item.

Next, based on FIG. 3, the specific process of the measured value deviation monitoring of the remote monitoring control apparatus 100 of Embodiment 1 of this invention is demonstrated.
If only the basic processing of the measurement value deviation monitoring described with reference to FIG. 2 is used, if the master station A loses the current measurement value due to some factor of the network 40 or the master station A, there is a possibility that it cannot be recovered.
For example, in FIG. 3, the measured value is transmitted from the slave station B to the master station A at the timing t1 of departure monitoring, but the transmission fails for some reason. In this state, when the measurement value does not change and the master station A loses the current measurement value, the master station A cannot recover the measurement value.
In order to avoid this, in the remote monitoring control apparatus 100 according to the first embodiment of the present invention, all measured values of the slave station B are transmitted from the slave station B to the master station A at a fixed period T0 regardless of whether or not there is a set value deviation. Transmit to. In the example of FIG. 3, all measured values of the slave station B are transmitted from the slave station B to the master station A at the timing tx.

The period T0 is set to a constant period that does not affect the load on the network. In order not to affect the load on the network, the period T0 needs to be set as long as possible in consideration of the number of measurement items monitored by the slave station B and the fluctuation state of each measurement value.
In addition, transmission of all measured values of the slave station B does not have to be transmitted all at once from the slave station B to the master station A, and may be divided depending on the number of measurement items and the fluctuation status of each measured value. Then, it can be transmitted from the slave station B to the master station A.

  In the present invention, the first fixed cycle is the cycle T, and the second fixed cycle is the cycle T0. The first set value is the set value D.

  As described above, the remote monitoring control apparatus according to the first embodiment monitors the measurement value at the period T, and the difference between the current measurement value and the measurement value transmitted last time is a set value provided for each measurement item. When the value deviates from D, the current measurement value is transmitted from the slave station to the master station, and transmission at the time of departure is performed. Further, the measurement values of all measurement items are transmitted from the slave station to the master station at a fixed period T0. Therefore, transmission of multi-measurement items is possible even at low speed communication, and even when the receiving side loses the current measurement value, the measurement value can be recovered. In addition, appropriate monitoring according to the degree of change of measurement items can be performed.

Embodiment 2. FIG.
The remote monitoring control apparatus 200 according to the second embodiment provides the remote monitoring control apparatus 100 according to the first embodiment with a setting value E smaller than the setting value D, in addition to the setting value D, and the setting value within a certain period T0. When it deviates from E, the flag F1 indicating that it deviates during transmission at a fixed period is added and transmitted.

Hereinafter, the operation of the remote monitoring control device of the second embodiment will be described with reference to FIG. 1 which is a block diagram of the remote monitoring control device, based on FIG. 4 which is an operation explanatory diagram of the remote monitoring control device. The difference from 1 will be mainly described.
In order to distinguish from the remote monitoring control device 100 of the first embodiment, the remote monitoring control device 200 of the second embodiment will be described.

  In the remote monitoring and control apparatus 200 according to the second embodiment, the configurations of the master station A and the slave station B are the same as those in the first embodiment. The function of each unit will be described with reference to FIG.

  The master station transmission processing unit 11 receives the fixed-cycle transmission data, the deviation transmission data, and the flag F1, which will be described later, transmitted from the slave station transmission processing unit 21 of each of the slave stations B1 to Bn. Notify the management unit 12. The reception history management unit 12 stores the fixed-cycle transmission data, deviation transmission data, and flag F1 received from the master station transmission processing unit 11, and manages them as a history. The master station set value management unit 13 centrally manages the periods T and T0 of each of the slave stations B1 to Bn, the set value D of each measurement item, and the set value E described later, and each slave station when necessary. Transfer to B1 to Bn.

The slave station transmission processing unit 21 transmits the measurement value deviating from the set value D from the measurement value deviation monitoring unit 22 to the master station A in a cycle T. Further, the slave station transmission processing unit 21 transmits all measured values of the slave stations to the master station A at a period T0. Further, the measured value from the measured value input unit 25 and the flag F1 from the measured value deviation monitoring unit 22 are transmitted to the master station.
The measured value deviation monitoring unit 22 compares the measured value from the measured value input unit 25 with the previous transmission value, and monitors the deviation from the set values D and E. When deviating, the measured value and flag F1 are notified to the slave station transmission processing unit 21. This process is repeated at period T.
The transmission value management unit 23 stores and manages the measurement values transmitted from the slave station transmission processing unit 21 to the master station A.
The slave station set value management unit 24 manages the slave station periods T and T0 and the set values D and E of the respective measurement items.
The measurement value input unit 25 inputs the physical quantity of each measurement item to be monitored from each measurement device 31 and converts it into measurement value data.

FIG. 4 is an operation explanatory diagram expressed in time series in order to explain processing mainly performed in the slave station B of the remote monitoring control apparatus 200 according to the second embodiment of the present invention.
Based on FIG. 4, the specific process of the measured value deviation monitoring of the remote monitoring control apparatus 200 of Embodiment 2 of this invention is demonstrated.

The remote monitoring control apparatus 200 according to the second embodiment is provided with a setting value E smaller than the setting value D, in addition to the setting value D for deviation monitoring of the measurement value described in the first embodiment.
In FIG. 4, the measured value does not deviate from the set value D at any timing from the timing t1 to t5 of the departure monitoring with reference to the measured value transmitted from the slave station B to the parent station A at the departure monitoring timing t0. .
On the other hand, it deviates from the set value E at the timing t4 of deviation monitoring. In this case, at the timing tx when all measured values are transmitted from the slave station B to the master station A in the period T0, the flag F1 is added to the measured value and transmitted from the slave station B to the master station A.
That is, when a certain measured value deviates from the set value E within a certain period T0, the flag F1 indicating that it has deviated when the constant period T0 is transmitted is transmitted.
A set value E is individually provided for each measurement item. This is because the deviation monitoring set value E is individually provided for each measurement item, thereby enabling appropriate monitoring according to the degree of change of the measurement item.

  Thus, apart from the set value D for monitoring the deviation of the measured value, a set value E smaller than the set value D is provided, and the master station A deviates from the set value D by monitoring the presence of the flag F1. Even if not, the status of the measured value can be grasped, and more detailed monitoring can be performed without affecting the load on the network 40.

  Note that the second setting value of the present invention is the setting value E, and the first flag is the flag F1.

  As described above, the remote monitoring control apparatus according to the second embodiment provides the remote monitoring control apparatus 100 according to the first embodiment with the setting value E smaller than the setting value D, apart from the setting value D, and has a fixed period. If the set value E deviates within T0, a flag F1 indicating that the set value E has been deviated during transmission at a fixed cycle is transmitted. Therefore, transmission of multi-measurement items is possible even at low-speed communication, and even when the receiving side loses the current measurement value, the measurement value can be recovered, and appropriate monitoring according to the degree of change of the measurement item can be performed. Furthermore, more detailed monitoring can be performed without affecting the load on the network 40.

Embodiment 3 FIG.
The remote monitoring and control apparatus according to the third embodiment is provided with a network load detection unit in the slave station of the remote monitoring and control apparatus 200 according to the second embodiment, and when the network becomes heavily loaded, the transmission at the time of departure is suppressed. If the deviation continues at the timing of the deviation monitoring, the flag F2 is added and transmitted.

  Hereinafter, with respect to the configuration and operation of the remote monitoring and control apparatus of the third embodiment, the difference from the first and second embodiments based on FIG. 5 which is a block diagram of the remote monitoring control apparatus and FIG. 6 which is a process explanatory diagram. The explanation will be focused on. In FIG. 5, the same or corresponding parts as those in FIG.

FIG. 5 shows a configuration of the entire system including the master station A and the slave station B of the remote monitoring control apparatus 300 according to the third embodiment of the present invention.
FIG. 6 is an operation explanatory diagram represented in time series for explaining processing mainly performed in the slave station B of the remote monitoring control apparatus 300 according to the third embodiment of the present invention.

  In the remote monitoring control apparatus 300 according to the third embodiment, a network load detection unit 26 is added to the slave station B. The function of each unit will be described with reference to FIG. 5 which is a block diagram of the remote monitoring control device 300.

  The master station transmission processing unit 11 receives the periodic transmission data, the deviation transmission data, and the flags F1 and F2 transmitted from the slave station transmission processing unit 21 of each of the slave stations B1 to Bn, and receives the history management unit. 12 is notified. The reception history management unit 12 stores the fixed-cycle transmission data, deviation transmission data, and flags F1 and F2 received from the master station transmission processing unit 11, and manages them as a history. The master station set value management unit 13 centrally manages the periods T and T0 of each of the slave stations B1 to Bn and the set values D and E of each measurement item, and transfers them to each of the slave stations B1 to Bn when necessary.

The slave station transmission processing unit 21 transmits the measurement value deviating from the set value D from the measurement value deviation monitoring unit 22 to the master station A in a cycle T. Further, the slave station transmission processing unit 21 transmits all measured values of the slave stations to the master station A at a period T0. If there is a high load notification from the network load detector 26 during transmission, the transmission is suppressed. In addition, the measurement value from the measurement value input unit 25 and the flags F1 and F2 from the measurement value deviation monitoring unit 22 are transmitted to the master station.
The measured value deviation monitoring unit 22 compares the measured value from the measured value input unit 25 with the previous transmission value, and monitors the deviation from the set values D and E. When deviating, the measured value and flags F1 and F2 are notified to the slave station transmission processing unit 21. This process is repeated at period T.
The transmission value management unit 23 stores and manages the measurement values transmitted from the slave station transmission processing unit 21 to the master station A.
The slave station set value management unit 24 manages the slave station periods T and T0 and the set values D and E of the respective measurement items.
The measurement value input unit 25 inputs the physical quantity of each measurement item to be monitored from each measurement device 31 and converts it into measurement value data.
The network load detection unit 26 monitors the load state of the network 40 between the master station A and the slave station B, and notifies the slave station transmission processing unit 21 if the load is high.

FIG. 6 is an operation explanatory diagram expressed in time series for explaining processing mainly performed in the slave station B of the remote monitoring control apparatus 300 according to the third embodiment of the present invention. A specific process of the measurement value deviation monitoring of the remote monitoring control device 300 according to the third embodiment will be described. For simplicity, the setting value E is omitted in FIG.

  In the remote monitoring and control apparatus 300 according to the third embodiment, the network load detection unit 26 monitors the load state of the communication network between the master station A and the slave station B. Notice.

In FIG. 6, since the measurement value at the deviation monitoring timing t1 deviates from the set value D on the basis of the measurement value transmitted from the slave station B to the parent station A at the deviation monitoring timing t0, The measurement value is transmitted from the slave station B to the master station A. At the departure monitoring timing t2, the measurement value at this timing deviates from the set value D on the basis of the measurement value transmitted from the slave station B to the master station A at the timing t1, so The measured value is transmitted to the station A.
At the deviation monitoring timing t3, the measurement value at this timing does not deviate from the set value D on the basis of the measurement value transmitted from the slave station B to the master station A at the timing t2. The measured value is not transmitted to.
At the deviation monitoring timing t4, the measurement value at this timing deviates from the set value D with reference to the measurement value transmitted from the slave station B to the master station A at the timing t2. For this reason, normally, the measurement value at timing t4 is transmitted from the slave station B to the master station A. However, since the load on the network 40 is high and the network load detection unit 26 notifies the slave station transmission processing unit 21, transmission of measurement values is suppressed.

  At the next deviation monitoring timing t5, the measured value transmitted from the slave station B to the master station A is deviated from the set value D with reference to the measured value transmitted from the slave station B to the master station A. In addition to transmission, a flag F2 indicating that transmission suppression has occurred is added.

  In FIG. 6, a measurement value and a flag F2 indicating that transmission suppression has occurred are transmitted to the master station A at timing t5. If the load on the network 40 is high at the timing t5 and the network load detection unit 26 notifies the slave station transmission processing unit 21 and the transmission of the measured value is suppressed, the slave station B then sends the master station. When the measured value is transmitted to A, the flag F2 is added and transmitted.

In addition, although the remote monitoring control apparatus 300 of this Embodiment 3 demonstrated as a structure which adds the network load detection part 26 to the remote monitoring control apparatus 200 of Embodiment 2, the remote monitoring control apparatus of this Embodiment 1 is demonstrated. The network load detection unit 26 may be added to the 100.
The second flag of the present invention is the flag F2.

  As described above, the remote monitoring and control apparatus according to the third embodiment is provided with a network load detection unit in the slave station of the remote monitoring and control apparatus 200 according to the second embodiment, and when the network is heavily loaded, The transmission at the time of departure is suppressed, and if the departure continues at the next departure monitoring timing, the flag F2 is added for transmission. Therefore, transmission of multi-measurement items is possible even at low speed communication, and even when the receiving side loses the current measurement value, the measurement value can be recovered. Moreover, appropriate monitoring according to the degree of change of the measurement item can be performed, and more detailed monitoring is possible without affecting the load on the network 40. Furthermore, it is possible to reduce the load on the network without extending deviation monitoring and fixed-cycle transmission.

Embodiment 4 FIG.
The remote monitoring control device 400 according to the fourth embodiment is configured to change the deviation monitoring cycle T, the constant transmission cycle T0, and the set values D and E in the remote monitoring control device 300 according to the third embodiment. The value change unit is provided in the master station A and the slave station B.

  Hereinafter, the configuration and operation of the remote monitoring control device 400 according to the fourth embodiment will be described based on FIG. 7 which is a block diagram of the remote monitoring control device 400 and FIG. The difference will be mainly described. In FIG. 7, the same or corresponding parts as those in FIGS. 1 and 5 are denoted by the same reference numerals.

FIG. 7 shows the configuration of the entire system including the master station A and the slave station B of the remote monitoring control apparatus 400 according to the fourth embodiment of the present invention.
FIG. 7 is an operation explanatory diagram represented in a time series in order to explain processing mainly performed in the slave station B of the remote monitoring control apparatus 400 according to the fourth embodiment of the present invention.

  In the remote monitoring and control apparatus 400 of the fourth embodiment, the master station setting value changing unit 14 is added to the master station A, and the slave station setting value changing unit 27 is added to the slave station B. With reference to FIG. 7, which is a block diagram of the remote monitoring control device 400, functions of each unit will be described.

The master station transmission processing unit 11 receives the periodic transmission data, the deviation transmission data, and the flags F1 and F2 transmitted from the slave station transmission processing unit 21 of each of the slave stations B1 to Bn, and receives the history management unit. 12 is notified. The reception history management unit 12 stores the fixed-cycle transmission data deviation transmission data received from the master station transmission processing unit 11 and the flags F1 and F2 and manages them as a history. The master station set value management unit 13 accepts each cycle and change of the set value from the master station set value change unit 14, and also includes the cycles T and T0 of the slave stations B1 to Bn and the set value D of each measurement item. E is centrally managed and transferred to each of the slave stations B1 to Bn when necessary.
The master station set value change unit 14 changes the deviation monitoring period T, fixed period transmission period T0, and set values D and E of the slave station B with respect to the master station set value management unit 13.

The slave station transmission processing unit 21 transmits the measurement value deviating from the set value D from the measurement value deviation monitoring unit 22 to the master station A in a cycle T. Further, the slave station transmission processing unit 21 transmits all measured values of the slave stations to the master station A at a period T0. If there is a high load notification from the network load detector 26 during transmission, the transmission is suppressed. In addition, the measurement value from the measurement value input unit 25 and the flags F1 and F2 from the measurement value deviation monitoring unit 22 are transmitted to the master station.
The measured value deviation monitoring unit 22 compares the measured value from the measured value input unit 25 with the previous transmission value, and monitors the deviation from the set values D and E. When deviating, the measured value and flags F1 and F2 are notified to the slave station transmission processing unit 21. This process is repeated at period T.
The transmission value management unit 23 stores and manages the measurement values transmitted from the slave station transmission processing unit 21 to the master station A.
The slave station set value management unit 24 receives changes in each cycle and set value from the slave station set value change unit 27, and manages the cycles T and T0 of the slave station B and the set values D and E of each measurement item. To do. In addition, when each cycle and set value are changed on the slave station B side, the change information is transferred to the master station A also on the master station A side.
The measurement value input unit 25 inputs the physical quantity of each measurement item to be monitored from each measurement device 31 and converts it into measurement value data.
The network load detection unit 26 monitors the load state of the network 40 between the master station A and the slave station B, and notifies the slave station transmission processing unit 21 if the load is high.
The slave station set value change unit 27 changes the slave station B deviation monitoring period T, fixed period transmission period T0, and set values D and E with respect to the slave station set value management unit 24.

FIG. 8 is an operation explanatory diagram represented in time series in order to explain processing mainly performed in the slave station B of the remote monitoring control apparatus 400 according to the fourth embodiment of the present invention.
Based on FIG. 8, the specific process of the measured value deviation monitoring of the remote monitoring control apparatus 400 of Embodiment 4 of this invention is demonstrated. For simplicity, the setting value E is omitted in FIG.

As an example, in the slave station set value changing unit 27 on the slave station B side, the cycle of measurement value deviation monitoring is changed from cycle T to cycle Ta, and the management value of measurement value deviation monitoring is changed from set value D to set value Da. The case where it changed is demonstrated.
In FIG. 8, it is assumed that the period T and the set value D are changed between the timing t3 and the timing t4. In FIG. 8, the time interval (cycle) between the timing t4 and the timing t5 of the next measured value deviation monitoring is extended to Ta.
In addition, the installation value D of the measured value deviation monitoring is changed to the set value Da after timing t4.

In the fourth embodiment, as an example, a case has been described in which the slave station set value changing unit 27 on the slave station B side changes the measurement value deviation monitoring cycle T and the measurement value deviation monitor set value D. The same applies to the case where the period T0 for transmitting the measurement value at regular intervals and the set value E for monitoring the deviation of the measurement value are changed.
In addition, the master station set value changing unit 14 of the master station A can change the deviation monitoring period T, the constant transmission period T0, and the set values D and E.
In the fourth embodiment, the master station set value change unit 14 is added to the master station A side, and the slave station set value change unit 27 is added to the slave station B side. A set value changing unit can be added to either one.

  As described above, by changing the deviation monitoring period T, fixed period transmission period T0, and setting values D and E, the line quality of the network 40 is deteriorated and the change in the measurement value to be monitored is increased. Even if the error occurs, the network load can be reduced and appropriate measurement value deviation monitoring can be performed.

  The remote monitoring control device 400 of the fourth embodiment has been described as a configuration in which the master station setting value changing unit 14 and the slave station setting value changing unit 27 are added to the remote monitoring control device 300 of the third embodiment. However, a configuration in which the master station setting value changing unit 14 and the slave station setting value changing unit 27 are added to the remote monitoring control device 100 of the first embodiment or the remote monitoring control device 200 of the second embodiment may be adopted. .

  As described above, the remote monitoring and control apparatus 400 according to the fourth embodiment is different from the remote monitoring and control apparatus 300 according to the third embodiment in the deviation monitoring period T, the constant transmission period T0, and the set value D of the slave station B. , E are provided in the master station A and the slave station B, respectively. Therefore, transmission of multi-measurement items is possible even at low speed communication, and even when the receiving side loses the current measurement value, the measurement value can be recovered. In addition, it is possible to perform appropriate monitoring according to the degree of change of measurement items and the load state of the network, and more detailed monitoring is possible. Furthermore, it is possible to reduce the load on the network without extending deviation monitoring and fixed-cycle transmission.

Embodiment 5. FIG.
When the setting value D is changed to the master station A of the remote monitor control apparatus 400 of the fourth embodiment, the remote monitor control apparatus 500 of the fifth embodiment uses the network from the measurement values received by the master station A in the past. A network load estimator for estimating a change in load is added.

  Hereinafter, the configuration and operation of the remote monitoring control device 500 of the fourth embodiment will be described based on FIG. 9 which is a block diagram of the remote monitoring control device 500, focusing on the differences from the first to fourth embodiments. In FIG. 9, the same or corresponding parts as those in FIGS. 1, 5, and 7 are denoted by the same reference numerals.

  FIG. 9 shows the configuration of the entire system including the master station A and the slave station B of the remote monitoring control apparatus 500 according to the fifth embodiment of the present invention.

  In the remote monitoring control apparatus 500 of the fifth embodiment, a network load estimation unit 15 is added to the master station A. With reference to FIG. 9 which is a block diagram of the remote monitoring control device 500, functions of each part of the master station A will be described. Since the function of each part of the slave station B is the same as that of the fourth embodiment, a description thereof will be omitted.

The master station transmission processing unit 11 receives the fixed-cycle transmission data, the deviation transmission data, and the flags F1 and F2 transmitted from the slave station transmission processing unit 21 of each of the slave stations B1 to Bn, and receives the history management unit. 12 is notified. The reception history management unit 12 stores the periodic transmission data and deviation transmission data received from the master station transmission processing unit 11 and manages them as a history. The master station set value management unit 13 accepts each cycle and change of the set value from the master station set value change unit 14, and also includes the cycles T and T0 of the slave stations B1 to Bn and the set value D of each measurement item. E is centrally managed and transferred to each of the slave stations B1 to Bn when necessary.
The master station set value change unit 14 changes the deviation monitoring period T, fixed period transmission period T0, and set values D and E of the slave station B with respect to the master station set value management unit 13.
When the setting value D is changed, the network load estimation unit 15 refers to the reception history management unit 12 and estimates a change in the network load from the measurement values received by the master station A in the past. The transmission frequency of the transmission at the time of deviation (the number of transmissions at the time of deviation during the period T0: N) when the setting value D is replaced with the setting value E is estimated based on the probability P including the flag F1 in the periodic transmission. .

Next, the network load estimating method of the network load estimating unit 15 will be specifically described.
The network load estimator 15 transmits the transmission frequency at the time of departure (transmission at the time of departure between the periods T0) when the set value D is replaced with the set value E by the probability P including the flag F1 in the periodic transmission. Number of times: N) is estimated.
The transmission frequency of deviation transmission (the number of deviation transmissions during the period T0: N) in which the setting value D is changed to the setting value E is expressed by the following equation (1).
N = (T0 / T) × P (1)
Here, T is a period of deviation monitoring of measured values, and T0 is a period of periodic transmission in which all measured values are transmitted from the slave station B to the master station A. P is a probability that the flag F1 is included in the periodic transmission.

For example, during the period T0, the deviation management of the measurement value is performed at the period T, and out of the ten fixed-cycle transmissions, the set value E is deviated and the fixed-period transmission of the measurement values to which the flag F1 is added is twice. Assuming that In this case, P = 2/10 = 0.2.
And when T0 / T = 30/3 = 10,
N = 10 × 0.2 = 2
It becomes.
This indicates that when the set value D is changed to the set value E, if the deviation monitoring of the measurement value is performed ten times, the deviation transmission of the measurement value may occur twice.

  In this way, by providing the network load estimation unit 15 in the master station A, when the set value D is changed, the measured value received by the master station A in the past with reference to the stored data of the reception history management unit 12 From this, it is possible to estimate a change in the load on the network 40.

  As described above, the remote monitoring control apparatus 500 of the fifth embodiment receives the master station A in the past when the setting value D is changed to the parent station A of the remote monitoring control apparatus 400 of the fourth embodiment. A network load estimator for estimating a change in network load from the measured values is added. Therefore, transmission of multi-measurement items is possible even at low speed communication, and even when the receiving side loses the current measurement value, the measurement value can be recovered. In addition, it is possible to perform appropriate monitoring according to the degree of change of measurement items and the load state of the network, and more detailed monitoring is possible, and the load on the network can be reduced without extending the period of deviation monitoring and fixed period transmission. Furthermore, it is possible to estimate a change in the network load when the set value D is changed.

  Note that the present invention can be freely combined with each other within the scope of the invention, and the embodiments can be modified or omitted as appropriate.

100, 200, 300, 400, 500 Remote monitoring and control device,
11 parent station transmission processing unit, 12 reception history management unit, 13 parent station set value management unit,
21 slave station transmission processing unit, 22 measured value deviation monitoring unit, 23 transmission value management unit,
24 slave station set value management unit, 25 measured value input unit, 26 network load detection unit,
27 Slave station set value changing section, 31 measuring devices, 40 networks, A master station,
B, B1, B2, Bn Slave stations.

Claims (5)

In a remote monitoring and control apparatus that connects a master station and a slave station via a network and transmits a plurality of measurement values from the slave station to the master station,
The measurement value is monitored at the first fixed period, and the difference between the current measurement value and the previously transmitted measurement value deviates from the first set value for deviation monitoring provided for each measurement item. A remote monitoring and control device that performs transmission at the time of transmission in which values are transmitted from the slave station to the master station, and further transmits measurement values of all measurement items from the slave station to the master station at a second fixed period. Providing a second setting value smaller than the first setting value;
When the measured value deviates from the second set value within the second fixed period, the first flag is set when the measured values of all measurement items are transmitted from the slave station to the master station at the second fixed period. The remote monitoring and control apparatus according to claim 1, wherein the remote monitoring and control apparatus transmits the data by adding the data. Network load detection means for detecting the network load is provided in the slave station,
When the network is heavily loaded, the transmission at the time of departure is suppressed, and if the measurement value deviates from the first set value at the next monitoring of the measurement value, the transmission at the time of departure is performed. The remote monitoring control apparatus according to claim 1 or 2, wherein the transmission is performed with a second flag indicating that transmission is inhibited. The setting change means for changing the first set value, the second set value, the first fixed period, and the second fixed period is provided in both or any one of the master station and the slave station. Alternatively, the remote monitoring control device according to claim 3. 5. The distant location according to claim 4, wherein, when the first set value is changed, network load estimation means for estimating a change in the load on the network from the measurement value received by the parent station in the past is provided in the parent station. Supervisory control device.

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