JP3283764B2 - Remote monitoring control system and communication control method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which a master station device faces a slave station device which is a device to be controlled.
In particular, it efficiently monitors and controls the operation status of the slave station equipment and the operation status of the equipment, and determines the degree of valve opening, the rate of change in flow rate, the presence or absence of an abnormal signal, etc., based on a higher-level control device such as a computer or the like. The present invention relates to a remote monitoring control system and a communication control method for automatically transmitting an answer back signal such as an emergency shutoff valve operation command to a relevant slave station without passing through, and providing high reliability.

On the other hand, a remote monitoring control system which performs an automatic control by transmitting an optimization command to a slave station in response to a command from a computer in accordance with a parameter registered in accordance with a failure state of the slave station or simultaneously with the command, and The present invention relates to a communication control method.

[0003]

2. Description of the Related Art A remote monitoring and control system for water and sewage equipment or water / agricultural water equipment uses a computer to automatically control a slave valve located upstream based on information transmitted from a slave, for example, a flow rate of a certain slave. It was common for the operator or the operator to adjust to an appropriate amount by manual operation. However, in the conventional method, when the rate of change of the flow rate is equal to or higher than a certain value, or in a control requiring urgency, for example, in the case of an emergency shut-off valve command, the transmission time and processing time to the computer as described above, or a judgment due to human being There is a problem that a time lag such as a time lag occurs due to passing through.

Further, in the present system, when the slave station is called from the master station by the polling method, since the inquiry information is collected at a fixed cycle, there is a disadvantage that all the information can be obtained only at a fixed cycle. .

When a control command is sent from a computer to a certain slave station, one or more slave stations related to the slave station to be controlled in the master station device before the master station device sends the command to the slave station. When a failure status change is received, the current control is interrupted immediately, the selection of the slave station is canceled, and an appropriate command is issued again to the newly failed slave station. There was a problem that a time delay accompanied with the discrimination process due to the mode automatic driving occurred.

As a method for solving the former problem, for example, Japanese Patent Laid-Open Publication No. 4-35249 discloses a slave station transmission analyzing section which, when a signal received by a slave station transmitting / receiving section is a report message, stores a message in a data storage section. When the polling data is updated and stored as the report permission address of the slave station that transmitted the report message,
A technique has been disclosed in which a report transmission generation unit generates a report transmission relating to updated polling data and transmits the report transmission to a master station, thereby reducing the processing load of the entire system and speeding up the processing.

Japanese Patent Laid-Open Publication No. Sho 59-122151 discloses a technique in which in a communication system in which a plurality of stations are connected to a bus, all node stations circulate in a predetermined order to ensure communication. I have.

[0008]

However, the above prior art has the following problems.

First, in the technique described in Japanese Patent Application Laid-Open No. 4-35249, first, since the master station sequentially calls the slave stations to perform communication opposition between the master station and the slave station, the communication efficiency is low, and If an abnormality or the like occurs, it lacks responsiveness.

In the technique described in Japanese Patent Laid-Open Publication No. Sho 59-122151, an abnormal transmission occurs in the slave station because the right of transmission from the master station (clock station) to the slave station (node station) is in a fixed order. When the communication between the master station and the slave station is not possible, the order of the transmission right is not changed and the count number of the transmission end detection pulse has to be changed in order to recognize the end of the communication between the master station and the slave station. Therefore, when the order of the transmission right is arbitrarily changed or when the transmission right in which an error has occurred in the slave station is abandoned, it is necessary to change a time constant such as elimination of the abnormal slave station No. Inconveniences such as stoppage are likely to occur.

An object of the present invention is to solve the above problems and to provide a highly efficient and flexible communication control device.

[0012]

An object of the present invention is to provide a slave station device.
Input a control command to control multiple connected main units.
A plurality of master stations having an input unit, and
The corresponding main engine is controlled based on the control command sent.
Control and the measured value measured from the main engine device.
A plurality of slave stations to be sent to the master station as state quantities of the apparatus
Equipment to a remote monitoring and control system connected by a transmission line
In the master station device, a control command registered in advance and
Storage means for storing a state quantity registered in advance;
Control command input from the unit and sent from the slave station device.
And the control command stored in the storage means,
The state machine is compared with the state quantity, and the main engine
Is determined, and the determined control command is
This can be achieved by providing control command transmitting means for transmitting to the slave station device .

[0013] Further, the above-mentioned object is achieved by controlling the control input to the master station device.
Command to the slave station, and the main unit connected to the slave station.
In remote monitor communication control method for controlling the device, the
The master station device has a pre-registered control command and a pre-registered
Control means for storing the state quantity of the
Command and the state quantity sent from the slave station device and the storage
Comparing the control command and the state quantity stored in the
Based on the comparison result, determine the control command for the main engine
The determined control command can be transmitted to the slave station device .

[0014]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a system configuration of the present invention. In this system, a computer 2 and a master station device 1 are connected via a bus 3 and a plurality of slave station devices which are devices to be controlled. 2 and a main unit 13 such as a pump and a valve are connected to the master station 1 via an NTT line 15.

The master station apparatus 1 inputs an operation start command and an operation stop command according to a command from an operator to the slave station apparatus 12 from a keyboard provided in the monitor and control console 10, and the input data is monitored and controlled. The data is edited by the unit 5, converted into a transmission protocol to the slave station device 12 by the transmission / reception unit 6, and transmitted to the slave station device 12 via the modem 9.

On the other hand, the operation state of the main unit 13 sent from the slave station device 12, ie, the start / stop of the pump, the flow rate of the reservoir, the operation state of the valve, and the abnormality in the slave station device 12 (program abnormality or hardware abnormality) ) And data on abnormalities (congestion, disconnection) of the NTT line 15 are transmitted from the modem 9 to the transmitting / receiving unit 6.
Is displayed on the graphic panel of the monitoring control console 10 by the monitoring control unit 5, and the displayed content allows the operator to, for example, look at the flow rate of the control of the child station device 12, and Optimization control was manually performed to open and close the flow-related valves. When the monitoring console 10 and the monitoring control unit 5 are not provided, this series of operations is performed by the computer automatic operation method and the slave station device 1 input from the transmitting / receiving unit 6 is used.
2 is input to the computer 2 via the upper system interface unit 4 and the system bus 3, and forms a closed loop such as flow rate adjustment. Master station device 1 and slave station device 12 in the present invention
First, the specificity, importance, priority, and the like of the position information transmitted from the child station device 12 into the parent station device 1
A slave station state identification processing unit 7 for judging relevance is provided. In this processing unit, information sent from a slave station device 12 is compared with a parameter registered in a slave station parameter unit 8 to determine a flow rate change rate. Is automatically judged whether it is an abnormality requiring responsiveness such as an emergency stop of the pump, etc., and as a result, an emergency shut-off valve operation command or the like is sequentially or simultaneously transmitted to one or more slave stations 12 of the corresponding channel. Section 6—Send via modem 9. The parameters can be arbitrarily changed by the PC unit 16. Other than the above, the resolution of this parameter may be, for example, an abnormality of the NTT line 15, an abnormality of the main unit in the slave station device,
It has a function of freely forming a closed loop between the slave station devices 12 when the abnormality or the like is detected in a position or data corresponding to a parameter, such as a change rate of a drainage flow rate.

On the other hand, when a control command is sent from the computer 2 to the slave station device 12, before or during the time when the master station device 1 sends the control command to the slave station device 12, the control command is transmitted to the slave station device 12. When a change in the failure state of another slave station device 12 to be performed is detected by the master station device 1, a control command from the computer 2 as information to be transmitted to the slave station device 12 and a control generated in the slave station state identification processing unit 7. There will be two control commands of commands. In this case, depending on the state of the slave station device 12, it may be better to give priority to the control command of the computer 2, or to give priority to the control command generated in the slave station identification processing unit 7. Therefore, in the master station device,
When a control command is sent from the computer 2 in order to avoid a state in which two control commands are generated, the control command is replaced in accordance with a control parameter 19 registered in advance by the optimal control determination processing unit 18 or the control command is replaced. At the same time, a control command according to the state is sent to a plurality of applicable slave stations, so that optimum control is enabled. Also, when the optimal control is being performed,
The same state signal is sent to the computer 2 via the upper interface unit 4 and the system bus 3 to notify the operator.
FIG. 14 shows a display example.

Further, in the case of the polling system (slave station calling system) or the sequential search system in which the slave stations are called in a specific order, the transmission / reception section 6 is raised from the slave station device 12 polled by the polling order / cycle changing device 17. It is possible to perform communication control with high communication efficiency and high flexibility by arbitrarily changing the polling order of the slave station device 12 or changing the polling cycle in accordance with the uniqueness of the information that is registered in the slave station parameter section 8. Is possible.

The peculiarity of the polling method is that the slave unit No., the position information, and the rate of change of the measured value are registered in the parameter unit 8 in advance in the slave station parameter unit 8, and the certain slave unit 1
2, when the above-mentioned abnormality occurs, the slave station state identification processing unit 7
To change the polling order in accordance with the registration of the slave station parameter 8 or to increase or decrease the polling cycle of the slave station or the relevant slave station in accordance with the parameter cycle so that necessary information of the system can be freely collected. The purpose is.

The operation of the transmitting / receiving section 6 in the cyclic transmission or HDLC transmission procedure will be described in detail with reference to a flowchart in FIG.

First, in step A10 of FIG. 2, it is checked whether or not congestion / line disconnection has occurred on the NTT line between the master station and the slave station. If normal, a control signal is received from the computer in step A11. Check if there is.

When a control signal is received in step A11, the control parameters of the control parameter 19 are loaded in step A13, and the process proceeds to the processing unit A20 for determining whether or not the parameter matches the corresponding control pattern. Generates a control command for the slave station device 12 in the optimum control discrimination processing unit 18, and in the case of a mismatch, causes the slave station state identification processing unit 7 to generate a command for the slave station device 12 in order to generate a command for the slave station device 12. The slave station parameters are loaded, and the process proceeds to step A20.

If traffic congestion / line disconnection occurs in step A10, the flow jumps to step A110 to check the end of the search for all child stations, advances to child station No. in A115, returns to A10, and receives data of the next child station.

Next, at A30, it is checked whether the received data is a position or a word registered in the parameter,
If it corresponds to the control parameter 19, the process goes to step A35 to send control such as emergency stop to the corresponding CH slave station. On the other hand, if the control parameters do not match, and if they correspond to the slave station parameters 9, they are not transferred to the higher-level computer or the monitoring controller, and the slave station state identification processor 7 determines the next step according to the contents of the set parameters. Branch to

If the position corresponds to the emergency shutoff valve, A4
The control goes to 0 and an emergency stop command is sent to the slave station of the channel specified by the slave station parameter 9 as an answer back. On the other hand, when the received data is a measured value, for example, when the difference between the previous value and the present value is equal to or greater than a certain value, in step A50, a command to adjust the control of the valve of the upstream reservoir is sent out as an answer back.

Further, when a state change occurs in the parameter position corresponding to the closed loop, in step A60, the received data itself is sent back to the channel corresponding to the parameter,
In step A70, a control output command is issued to a plurality of channels corresponding to the parameters. If the optimal control is being performed in steps A35 to A70, the same state signal is sent to the computer in step A75. As shown in FIG. 14 , the computer displays the state of optimum control and displays on the screen an operation state different from the operation of the operator, that is, an automatic state. If the received data does not correspond to the above parameters, the process proceeds to step A80, where the received data is directly transferred to the host computer or the monitoring control unit, and the control command received from the computer 2 is sent to the slave station device 12 as it is.

When this series of procedures is completed, step A
The process goes to 100 to check whether or not all word search is completed.

If all words are not completed, step A105
And the process returns to the initial operation in step A10.

Step A110 when all words have been searched
Then, it is checked whether or not the search for all slave stations has been completed. If the search has not been completed, the process proceeds to step A115 and returns to the initial operation step A10. In the case of termination, all the reception data processing is completed, and a new reception interrupt is awaited.

FIG. 3 shows a flowchart in the case where information to be sent to the slave station device 12 is generated by the slave station state identification processing section 7 in the flowchart shown in FIG.

In step C10, it is determined whether or not data has been received from the slave station. If data has been received, the flow advances to step C20 to load parameters corresponding to the slave station No. If not received, the process returns to step C10 and enters the idling state. In step C30, it is determined whether or not the reception pattern of the slave station data corresponds to the parameter.
Branches to steps C60 to C90 according to the parameter conditions. In steps C60 to C90, parameters corresponding to the conditions are loaded and transferred to the transmission / reception unit, and return to the idling state.

FIG. 4 shows a flowchart in the case where information to be sent to the slave station device 12 is generated by the optimum control determination processing section 18 in the flowchart shown in FIG. In step D10, it is determined whether or not a control signal has been received from the computer, and if it has been received, the process proceeds to step D20,
If not received, the flow returns to D10 to be in the idling state.
In step D20, it is determined whether or not data has been received from the slave station, and if so, control parameters are loaded from the control parameter section. In step D40, it is checked whether or not the control signal from the computer and the received data of the slave station correspond to the parameter. If the parameter is applicable, the corresponding parameter is transferred to the transmission / reception unit in step D50. If it does not correspond, it returns to the D10 return idling state.

FIG. 5 shows an operation flowchart of the master station apparatus 1 including the processing of the slave station state identification processing section 7, the polling order / cycle changing device 17, and the slave station parameter section 8 in the polling method or the sequential search method.

First, in step B10, it is checked whether or not traffic congestion / line disconnection has occurred. If normal, the slave station is polled in accordance with the parameter order in step B20 to collect data. If traffic congestion or line disconnection occurs in step B10, the flow jumps to step B120 to check the end of all slave stations facing each other.
It returns to 10 and moves to the polling of the next slave station data. If all slave stations are facing each other, the process shifts to B140 to return the facing order to the initial value and to B10.

Next, in B30, the received data is the parameter 9
It checks whether it is a position or word registered in the slave station, and if it corresponds to the slave station parameter, it does not transfer it to the host computer or the monitoring control unit, but branches to the next step according to the contents of the setting parameter.

If the position corresponds to either the emergency shut-off valve, the measurement value change rate abnormality detection (previous value-current value> a certain value or more), or if there is a state change in the related position, B70
The polling cycle is changed according to the parameter in B80 if the cycle change is applicable according to the slave station parameter 9, and the polling order is changed according to the parameter in B90 if the order is changed. On the other hand, if the received data does not correspond to the parameter, the process proceeds to step B50, and the received data is directly transferred to the host computer or the monitoring control unit. When this series of procedures is completed, the process moves to step B100 to check whether or not all word search is completed.

When all word search is not completed Step B11
At 0, the word address is incremented, and the process returns to the initial operation in step B10. Step B120 when all word search is completed
In step B130, it is checked whether or not it is the end of all the slave stations. If the end is not completed, the order of the slave stations is incremented and the process returns to step B10.

FIGS. 6 to 11 show the correspondence between the parameters of the received data stored in the slave station parameter section 8 and the parameters of the transmitted data.

FIG. 6 shows an example of an emergency stop command transmission pattern example. In the master station, data is received in the master station transmitting / receiving section, and the slave station state determination processing section and the parameter section determine whether or not the parameter is applicable. I do. When the received data corresponds to the parameter, for example, in No. 1, the receiving position 1
When SS1 (slave station No. 1), W2 (word 2) and P3 (position 3) of (reception CH1) are ON and SS3, W1 and P5 of reception position 2 (reception CH2) are ON,
SS2, W5 and P1 of transmission data 1 (transmission CH1) are set to O
Set to N and send to slave station.

FIG. 7 shows an example of the transmission pattern example corresponding to the change rate abnormality detection. In the reception measurement data, the maximum difference value of the change rate [this value-previous value] is set in advance as a parameter (A
To E), and in No. 1, the received data 1 [when the present value−the previous value ≧ A]
3) is sent to the corresponding slave station.

FIG. 8 shows an example of a closed loop transmission pattern example. In No. 1, received data 2 (received CH)
2) The data of SS2, W3 is transmitted to SS5, W6 of (transmission CH2) of transmission data 2 under the condition that SS1, W2, P3 of reception data 1 (reception CH1) is ON, and transmitted data 1 ( SS4, W5, P2 of transmission CH1)
Is turned on and transmitted to the slave station.

The slave station state identification processing section 7 compares the received data parameters stored in the slave station parameter section with the parameters sent from the slave station apparatus 12, and determines the transmission data parameters corresponding to the matching parameters. It is sent to the slave station device 12.

FIG. 9 shows a case of an example of a polling order change pattern.
1, W2, P3 is ON and SS of reception position 2
When 2, W3 and P4 are ON, the slave station polling order is changed from (1 → 2 → 3 → 4 → 5) to (1 → 3 → 4 → 5 → 2).

FIG. 10 shows the case of a change pattern of the common polling cycle.
SS1, W2, P3 of receiving position 2 and SS2, W of receiving position 2
3, if P4 is ON and the change rate A of the received data 3 is equal to or greater than the maximum difference value, the polling period common to all SSs is set to 5
Change from 00 ms to 300 ms.

FIG. 11 shows a case of a change pattern of the individual polling cycle.
When SS1, W2, and P3 are ON and the change rate A of the received data 2 is equal to or greater than the maximum difference value, the polling cycle for each SS is changed as shown in the table. FIGS. 12 and 13 show the relationship between the parameters of the control command and the reception data sent from the computer stored in the control parameter section 19 and the control command parameters.

FIG. 12 shows an example of sending a control pattern to a single station. In No. 1, control (S) is performed from a higher system (computer).
S1, X group 1, YNo.1)
Under the condition that S2, W2, P2 and SS3, W3, P3 are ON, the SS1, X group 1, YNo. 5, and OFF command of the transmission data 1 are transmitted to the slave station.

FIG. 13 shows an example of sending a control pattern to a plurality of stations. In No. 1, control (S) is performed from a higher system (computer).
S1, X group 1, YNo.1)
S2, W2, P2 and SS3, W3, P3 are ON condition, and SS1, X group 1, YNo. 5, OFF command and SS2, X group 1, YNo. 5, OFF command and SS3, X group 1 of transmission data 1 , YNo. 5, 6 commands to the slave station.

The case where the control command is sent from the computer 2 to the master station device 1 has been described.
Even when the operator inputs a control command from, the optimum control command for the slave station device 12 can be determined by the above-described configuration.

[0050]

According to the present invention, a plurality of master station devices and a plurality of slave station devices are connected by a transmission line, and a remote device for monitoring and controlling a controlled device connected to the slave station device from the master station device. In the supervisory control system, the uniqueness (rate of change in flow rate, importance, priority, etc.) of the position information transmitted from the slave station device in the master station device is determined, and a closed loop between slave stations is automatically formed. The identification device with the function of performing the above and the position information and its change rate, priority, importance, etc. are parameterized and resident, and the responsiveness such as the abnormal flow rate change rate of the slave station specified by the parameter or the stop of the pump is determined. When a necessary abnormality is detected, a corresponding control output such as an emergency shutoff valve operation command is automatically transmitted to a corresponding slave station in accordance with a parameter, thereby reducing the answer back transmission time and providing a highly reliable device. Furthermore, the versatility of the apparatus is improved by allowing the parameters to be arbitrarily changed by a loading tool such as a PC.

When the present system employs a polling (calling) method from the master station apparatus to the slave station apparatus or a sequential search method in which the slave stations are called in a specific order, the polling order /
By adding a cycle changing device and changing the polling (search) order or polling cycle in accordance with the peculiarity of the position information to allow a closed loop between slave stations freely, communication control with high communication efficiency and high flexibility can be performed. .

On the other hand, when a control command is sent from the computer to the slave station, before the master station device sends the control command to the slave station, a change in the failure state of another slave station related to the controlled slave station is detected by the master station device. If it is detected, a command corresponding to the status such as valve stop, pump stop, etc. is sent to a plurality of applicable slave stations simultaneously with the replacement of the control command or at the same time as the control command according to the parameters registered in advance in the optimum control determination processing unit. The optimal control of the slave station has been made possible.

Further, when the optimum control is being performed, this status signal is sent to the computer, and the computer displays the screen so that the operator can recognize the status signal. Optimal control can be realized.

[Brief description of the drawings]

FIG. 1 is an example of the overall system configuration of the present invention.

FIG. 2 is a flowchart of a cyclic transmission or HDLC transmission transmission operation in a master station.

FIG. 3 is a flowchart for generating a command by a slave station state identification process.

FIG. 4 is a flowchart for generating a control command by an optimum control determination processing unit.

FIG. 5 is a flowchart of a polling method or a sequential search method.

FIG. 6 is an example of an emergency stop command and a change pattern corresponding to change rate abnormality detection.

FIG. 7 is an example of a transmission pattern corresponding to detection of a change rate or more.

FIG. 8 is an example of a closed loop applicable transmission pattern.

FIG. 9 is an example of a polling order change pattern.

FIG. 10 shows an example of a common polling cycle change pattern.

FIG. 11 is an example of an individual polling cycle change pattern.

FIG. 12 is an example of sending a control pattern to a single station.

FIG. 13 is an example of sending a control pattern to a plurality of stations.

FIG. 14 is a screen display example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Master station apparatus, 2 ... Computer, 3 ... System bus, 4 ... Higher system interface unit, 5 ... Monitoring control unit, 6 ... Transceiving unit, 7 ... Slave station state identification processing unit, 8 ... Parameter unit, 9 ...
Modem, 10 ... Monitoring console, 12 ... Slave station, 13 ... Main machine,
Main panel (device to be controlled), 15: NTT line, 16: P
C (Personal Computer), 17: Polling order / cycle changing device, 18: Optimal control determination processing unit.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideyuki Tadokoro 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Omika Plant (72) Inventor Yo Takahashi 3-chome, Sachimachi, Hitachi City, Ibaraki Prefecture No. 1 Within Hitachi Engineering Co., Ltd. (56) References JP-A-8-65759 (JP, A) JP-A-4-5175 (JP, A) JP-A-7-183905 (JP, A) JP-A-7-183 282090 (JP, A)

Claims (4)

(57) [Claims] A plurality of master stations each having an input section for inputting a control command for controlling a plurality of master units connected to a slave station, and a control command sent from the master station. In a remote monitoring control system in which a plurality of slave station devices that transmit a measurement value measured from the master device as a state quantity of the master device to the master station device while controlling the corresponding master device are connected by a transmission line, The master station device has a pre-registered control command and a pre-registered
The storage means storing the state quantity to be compared with the control command input from the input unit and the control command and the state quantity stored in the storage means with the state quantity sent from the slave station device, A remote monitoring control system comprising: a control command transmitting means for determining a control command for the main device based on the comparison result and transmitting the determined control command to the slave station device. 2. The master station device further comprises a second storage means for storing a control command of the main device with respect to a state quantity of the main device sent from the slave device, wherein the control command is inputted from the input section. If not, the state quantity of the main unit sent from the slave station is compared with the state quantity stored in the second storage unit, and a control command for the main unit is determined based on the comparison result. 2. The remote monitoring control system according to claim 1, further comprising control command transmitting means for transmitting the determined control command to the slave station device. 3. The apparatus according to claim 2, wherein said master station device is an important device of said main device.
2. The remote monitoring control system according to claim 1, further comprising a polling cycle changing unit that changes a polling order or a polling cycle according to the priority and the relevance. 4. A slave station apparatus according to claim 1, wherein said control command is input to said master station apparatus.
To control the main device connected to the slave station device.
In the remote monitoring communication control method, the master station device
Stores registered control commands and pre-registered state quantities.
Comparing the input control command and the state quantity sent from the slave station device with the control command and the state quantity stored in the storage means , and based on the comparison result, the main engine A remote monitoring communication control method, comprising: determining a control command for a device; and transmitting the determined control command to the slave station device.