JP4014815B2 - Supervisory control system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a supervisory control system for monitoring and controlling water and sewage equipment, building equipment, factory equipment, production plants, etc., and particularly, supervisory control for reliably restoring data even when communication line reliability, speed, etc. are low. About the system.
[0002]
[Prior art]
Conventionally, a system shown in FIG. 5 is known as a system for monitoring and controlling the operating state of each equipment device that constitutes a monitoring control target process such as water and sewage equipment, building equipment, factory equipment, and production plant.
[0003]
The monitoring control system 101 shown in this figure includes a control device 103 that monitors and controls a process 102 that is a monitoring control target, and a process that receives process data collected by the control device 103 and displays it on a screen. A control command is generated in accordance with the contents operated by the operator, and this is transmitted to the control device 103, and the human interface device 104 that performs processing for controlling the process 102, etc., and the process data collected by the control device 103 A server device 105 that receives and creates and stores form data, trend data, failure history data, and the like, and a LAN 106 that supports communication among the server device 105, the human interface device 104, and the control device 103 are provided. , Informing the operator of the operation status of each equipment device such as each pump and motor constituting the process 102 and checking the failed device, etc., according to the operation contents of the operator, the set program, etc. Control data for instructing operation and stopping of the equipment is generated, and each pump and each motor are controlled.
[0004]
[Problems to be solved by the invention]
However, the conventional monitoring control system 101 described above has the following problems.
[0005]
First, in such a monitoring and control system 101, manufacturing cost must be reduced and price competitiveness must be provided. Therefore, as a human interface device 104 and a server device 105, a general personal computer that does not have a time guarantee mechanism. In many cases, a device or a workstation device is used, an Ethernet line having no time guarantee mechanism is used as the LAN 106, and an inexpensive programmable control device is used as the control device 103.
[0006]
For this reason, it is difficult to provide such a monitoring and control system 101 with the highly reliable communication capability required for industrial use, and the process data obtained by the control device 103 can be obtained at high speed and reliably. 104, not only can be transmitted to the server apparatus 105, but also process data may be lost or delayed, so that a large-scale plant or a plant that requires high speed and certainty can be monitored and controlled. There was a problem that I could not.
[0007]
In view of the above circumstances, the present invention provides a time guarantee mechanism for each device constituting the system. Hold Therefore, the process data obtained by the control device can be transmitted to the human interface device, server device, etc. at high speed and reliably, thereby reducing the manufacturing cost. Hold down An object of the present invention is to provide a monitoring control system that can monitor and control a large-scale plant or a plant that requires high speed and certainty.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention From central processing unit Monitoring control that supplies a control command to the control device via a communication line and causes the control device to collect the device information while controlling the monitoring control target, while monitoring the monitoring control target based on the collected device information In the system, The control device collects device information from the monitoring control target by operating in a monitoring control cycle having a cycle shorter by m times than the transmission cycle when transmitting device information to the central processing unit, and for the past n times When data is set to be bundled, each time a transmission cycle arrives, the current device information and the past m × n times of device information are combined into one transmission text and the communication line is connected to the central processing unit. On the other hand, the central processing unit receives the current transmission text that has been transmitted, and based on the received current device information and the past m × n device information, the past device failed to receive. Restore information It is characterized by doing.
[0009]
According to the above configuration, the process data collected by the control device is stored in the human interface device and the server device even when the process is monitored and controlled finely by setting the monitoring control cycle and the calculation cycle of the control device shorter than the communication cycle. To reach the high speed and reliably, This makes it possible to monitor and control a large-scale plant or a plant that requires high speed and certainty while keeping the manufacturing cost low.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
<< First Embodiment >>
FIG. 1 is a block diagram showing a first embodiment of a supervisory control system according to the present invention.
[0013]
The monitoring control system 1 shown in this figure includes a control device 3 that monitors and controls the process 2 to be monitored and controlled, and a transmission text (current process data and control data, (Text information including process data and control data of n times in the past) 8 (see FIG. 2), and generates a control command in accordance with processing to be displayed on the screen and contents operated by the operator. Is sent to the control device 3 to receive the human interface device 4 that performs the process of controlling the process 2 and the transmission text 8 output from the control device 3, and the form data, trend data, failure history data, etc. The server device 5 to be created and stored, the server device 5, the human interface device 4, the computer And a LAN6 of supporting communication between roll apparatus 3.
[0014]
Then, according to the operation contents of the operator, the set program, etc., the human interface device 4 generates a control command, and transmits the control command to the control device 3 so that each equipment provided in the process 2 in the control device 3 In addition, the control device 3 collects the state detection signals output from each sensor provided in the process 2 at a predetermined fixed period by the control device 3 to generate process data. However, the transmission text 8 including the past transmission data (data constituted by the current process data and the current control data) including the past, n-time transmission data, and the like is generated as one, and this is generated as the server device 5. , Each of the pumps, motors, etc. constituting the process 2 by transmitting to the human interface device 4 Together to record the operation state of 備機 unit, to screen, to perform such check failure equipment operator.
[0015]
The control device 3 is constituted by a programmable control device or the like, and when performing the monitoring control of the process 2, based on a preset program, from each sensor constituting the process 2 at a preset constant cycle A process input / output unit 7 that takes in an output state detection signal and generates process data, and controls each pump, each motor, and the like constituting the process 2 according to the input control data, and the process input / output The current control data input to the unit 7, the current transmission data composed of the current process data generated by the process input / output unit 7, the past and n transmission data including the transmission data, and the respective transmissions Data address, header including common information such as text length, serial number indicating the text serial number 2, the data editing unit 9 that generates the transmission text 8 shown in FIG. 2, and the transmission text 8 generated by the data editing unit 9 is transmitted to the LAN 6 and transmitted to the human interface device 4 and the server device 5. Generated by the real-time data transmission unit 10 for performing the processing to be performed, processing for fetching the control command from the human interface device 4 sent over the LAN 6, and the control command fetched by the real-time data transmission unit 10 and the process input / output unit 7 Based on the processed data, the process input / output unit 7 is controlled while generating the control data, and the control unit 11 is configured to control each pump, each motor, and the like constituting the process 2.
[0016]
Then, the control command output from the human interface device 4 is captured, and the state detection signal output from each sensor or the like constituting the process 2 is captured at a preset constant cycle to generate process data. Based on the comparison result between the control command and the process data, control data is generated to control each pump, each motor, and the like constituting the process 2. Furthermore, this control data, the current transmission data composed of the current process data, the past including the transmission data, the past n transmission data, the header including the common information such as the destination and text length of each transmission data The serial numbers indicating the serial numbers of the texts are collected to generate a transmission text 8, which is transmitted to the human interface device 4 and the server device 5.
[0017]
Further, the human interface device 4 is configured by a personal computer device, a workstation device, or the like used as a general-purpose product. When monitoring and controlling the process 2, the human interface device 4 is connected via the LAN 6 based on a preset program. A real-time data transmission unit 12 that communicates with the control device 3 in real time is constructed, and the transmission text 8 from the control device 3 sent to the LAN 6 is fetched, and the past and n process data included in the transmission text 8 In the past, the control data is restored n times, and based on the result of the restoration, the operation indicating the operation status of the process 2 while interpolating the process data and the control data that could not be restored in the previous communication processing. Display the status screen and present the operation details, failure details, etc. to the operator. , The operation contents of the operator, in accordance with a control program which is set in advance, generates a control command, and sends this on the LAN 6, and supplies to the control device 3.
[0018]
The server device 5 is composed of a personal computer device, a workstation device, or the like used as a general-purpose product. When monitoring and controlling the process 2, the server device 5 is controlled via the LAN 6 based on a preset program. The real-time data transmission unit 13 that communicates with the device 3 in real time is constructed, the transmission text 8 from the control device 3 sent over the LAN 6 is captured, and the past and n process data included in the transmission text 8 In the past, restore the control data n times, and based on this restoration result, interpolate and accumulate process data and control data that could not be restored in the previous communication process, Display the form to be displayed on the screen or form data necessary to print the form, the latest operation of process 2 Trend data indicating the status, failure history data indicating the failure message history of the process 2, etc. are created, and stored when a transfer request such as form data, trend data, failure history data is issued from the human interface device 4. Form data, trend data, failure history data, and the like are transmitted to the human interface device 4 for screen display, printing processing, and the like.
[0019]
As described above, in the first embodiment, the control device 3 collects the state detection signals and the like output from the sensors provided in the process 2 at a preset fixed period, and the process data , The transmission text 8 including the past transmission data (data constituted by the current process data and the current control data), the past transmission data, and the like including the transmission data 8 is generated. The process is transmitted to the server device 5 and the human interface device 4 to restore and interpolate process data, control data, etc. that could not be restored by the previous communication processing. 4. Time guarantee mechanism for server device 5, LAN6, etc. Have The process data and control data obtained by the control device 3 can be transmitted to the human interface device 4, the server device 5 and the like at high speed without fail, thereby reducing the manufacturing cost. Hold down Large plant, Or Plants and the like that require high speed and certainty can be monitored and controlled.
[0020]
As a result, if the transmission cycle of the control device 3 is set to, for example, “500 ms” and the transmission data for the past two times including the current transmission data is included in the transmission text 8, “12” is set. When the control data generated at “3:30:00 000 milliseconds” and the process data obtained at “12:30:00 000 milliseconds” are transmitted to the human interface device 4 and the server device 5, “12 Control data and process data obtained at “3: 30: 000, 000 milliseconds”, control data and process data obtained at “12: 29: 59,500 milliseconds”, and “12: 29: 58,000” Control data and process data obtained in “milliseconds” can be collected and transmitted in one transmission text 8.
[0021]
As a result, even if the human interface device 4, the server device 5, etc. have failed to receive the transmission text 8 in the past, the past control data and the past process data included in the current transmission text 8 are used and received. It is possible to reproduce control data and process data that have failed.
[0022]
<< Second Embodiment >>
FIG. 3 is a block diagram showing a second embodiment of the supervisory control system according to the present invention.
[0023]
The monitoring control system 21 shown in this figure has a control device 23 for finely monitoring and controlling the process 22 to be monitored and controlled in a short cycle, and a transmission text (past, m ×) output from the control device 23. Process data at the time of monitoring control at n times and information in text format including control data (see FIG. 4) 31 (see FIG. 4), screen display processing, and generation of control commands according to the contents operated by the operator Then, the data is transmitted to the control device 23 to receive the human interface device 24 that performs the process of controlling the process 22 and the transmission text 31 output from the control device 23, and forms data, trend data, failure history Monitoring of the server device 25 that creates and stores data and the control device 23 In longer than your period cycle, the servers 25, human interface apparatus 24, and a LAN26 of supporting communication between the control device 23.
[0024]
Then, according to the operation contents of the operator, the set program, etc., the human interface device 24 generates a control command, transmits this to the control device 23, and in a short cycle preset in the control device 23, In addition to making the operation and stop of each facility finely performed, the state detection signals output from each sensor provided in the process 22 are finely collected and the process data is generated while generating the process data. Each of the pumps constituting the process 22 is generated by generating a transmission text 31 including the control data including the past, m × n control cycle data, and the like, and transmitting it to the server device 25 and the human interface device 24. In addition to recording the operating status of each equipment such as motors, the screen So indicated, to perform, such as confirmation of failure equipment operator.
[0025]
The control device 23 is configured by a programmable control device or the like. When performing the monitoring control of the process 22, the process input / output unit 27 for monitoring and controlling the process 22 based on a preset program and the LAN 26 are provided. Through the real-time data transmission unit 28 that transmits / receives data to / from the human interface device 24 and the server device 25, and the control data received by the process input / output unit 27, and performs calculations at a preset short cycle. A control unit 29 that controls the process input / output unit 27 and a data editing unit 30 that edits the process data obtained by the process input / output unit 27, the control data generated by the control unit 29, and the like are constructed and burdened on the LAN 26 The human interface device 24 with a communication cycle that does not apply And control data generated at a monitoring control cycle and calculation cycle shorter than the communication cycle, and finely control each pump, each motor, etc. of the process 22, and each of the processes 22 constituting the process 22 Process text is generated by capturing status detection signals output from sensors, etc., and transmission text that combines the current process data, the past including the current control data, and m × n control cycle data in one 31 is generated and transmitted to the server device 25 and the human interface device 24.
[0026]
At this time, the process input / output unit 27 configures the process 22 with a monitoring control cycle shorter by “1 / m” times than the communication cycle of the real-time data transmission unit 28 based on the control data output from the control unit 29. While finely controlling the operation and stop of each pump, each motor, etc., the state detection signal output from each sensor constituting the process 22 is taken in finely to generate process data, which is sent to the control unit 29 Supply.
[0027]
Further, the real-time data transmission unit 28 has a communication cycle that is longer by “m” times than the communication speed communication cycle that does not place a burden on the LAN 26, that is, the monitoring control and calculation cycle of the process input / output unit 27 and control unit 29. The transmission text 31 output from the data editing unit 30 is sent out on the LAN 26, and while being transmitted to the human interface device 24 and the server device 25, the control command from the human interface device 24 sent out on the LAN 26 is fetched. Is supplied to the data editing unit 30.
[0028]
The data editing unit 30 takes in the current control data generated by the control unit 29 and the current process data generated by the process input / output unit 27 via the control unit 29 and stores them. However, the current process data, the current control cycle data composed of the current control data, the past, m × n control cycle data, the header including common information such as destination, text length, and text serial number 4 is generated, and the transmission text 31 shown in FIG. 4 is generated and supplied to the real-time transmission unit 28, and the control command received by the real-time data transmission unit 28 is fetched, and the control command is input to the control unit 29. Supply.
[0029]
The control unit 29 captures the process data output from the process input / output unit 27 at a calculation cycle set to the same period as the monitoring control cycle of the process input / output unit 27, and edits the data while temporarily storing it. The control command received by the real-time data transmission unit 28 via the data editing unit 30 and compared with the temporarily stored process data. Based on the comparison result, the process control Control data is generated and supplied to the process input / output unit 27.
[0030]
In addition, the human interface device 24 is configured by a personal computer device, a workstation device, or the like used as a general-purpose product, and when performing the monitoring control of the process 22, based on a preset program, via the LAN 24, A real-time data transmission unit 32 that communicates with the control device 23 in real time is constructed, and the transmission text 31 from the control device 23 sent over the LAN 26 is captured, and the past, m × n times included in the transmission text 31 Operation indicating the operation status of the process 22 while restoring the process data of the past, m × n times of control data, and interpolating the process data and control data that could not be restored in the previous communication processing Display the status screen and display the details of operation, breakdown, etc. In addition, a control command is generated according to the operation contents of the operator, a control program set in advance, and the like, and is transmitted to the LAN 26 and supplied to the control device 23.
[0031]
The server device 25 is composed of a personal computer device, a workstation device, or the like used as a general-purpose product. When performing monitoring control of the process 22, the server device 25 is controlled via the LAN 26 based on a preset program. A real-time data transmission unit 33 that communicates with the device 23 in real time is constructed, the transmission text 31 from the control device 23 sent out on the LAN 26 is captured, and past and n process data included in the transmission text 31 Restores control data of n times in the past, and displays a screen showing the specific contents of operation while interpolating and accumulating process data and control data that could not be restored in the previous communication processing Or the form data necessary to print the form and the latest operation details of the process 22 Trend data, failure history data indicating process failure message history, and the like are created. When a transfer request for form data, trend data, failure history data, etc. is issued from the human interface device 24, stored form data, trend Data, failure history data, and the like are transmitted to the human interface device 24 to perform screen display, print processing, and the like.
[0032]
As described above, in the second embodiment, the control command is generated by the human interface device 24 in accordance with the operation contents of the operator, the set program, etc., and is transmitted to the control device 23 to be controlled. The device 23 is made to perform detailed operations such as operation and stop of each facility in a short cycle set in advance and finely collect state detection signals output from each sensor provided in the process 22 to obtain process data. While being generated, the transmission text 31 is generated by combining the current process data, the past including the current control data, and the control cycle data of m × n times, and the like, and this is generated in the server device 25 and the human interface device 24. Process data that could not be restored in the previous communication process Since control data and the like are also restored and interpolated, even when the monitoring control cycle and calculation cycle of the control device 23 are made shorter than the communication cycle so that the process 22 is finely monitored and controlled, Collected process data, control data, and the like can reach the human interface device 24, the server device 25, and the like at high speed and reliably, thereby reducing the manufacturing cost. Hold down Large plant, Or Plants and the like that require high speed and certainty can be monitored and controlled.
[0033]
As a result, the process monitoring control cycle of the process input / output unit 27 is set to, for example, “100 ms”, the communication cycle of the real-time data transmission unit 28 is set to, for example, “500 ms”, and communication for the past three times in the transmission text 31 is performed. If the process data corresponding to the contents and the control data are set to be included, the process data and the control data obtained at “12:30:30 000 milliseconds” are sent to the human interface device 24, When transmitting to the server device 25, the process data and control data obtained at "12:30:00 000 milliseconds", and the process data obtained at "12:30:59 seconds 900 milliseconds", And the control data, the process data and the control data obtained at “12: 30: 59: 800 ms”, “12:30:30 Process data and control data obtained at "700 milliseconds" and process data and control data obtained at "12:30:59 seconds and 600 milliseconds" and "12:29:59 seconds and 500 milliseconds" Process data and control data obtained at "12:29:59 seconds 400 milliseconds" and process data and control data obtained at "12:29:59 seconds 300 milliseconds" Process data and control data, process data obtained at "12:29:59 seconds 200 milliseconds", and control data, process data obtained at "12:29:59 seconds 100 milliseconds", And control data, process data obtained at “12: 29: 59.000 milliseconds”, and control data, and process data obtained at “12: 29: 58.900 milliseconds”. And control data, process data obtained at "12:29:58 seconds 800 milliseconds", and control data, process data obtained at "12:29:58 seconds 700 milliseconds", and control data , Process data and control data obtained at “12:29:58 seconds 600 milliseconds” can be collected and transmitted in one transmission text 31.
[0034]
As a result, the human interface device 24, the server device 25 and the like have been transmitted in the past. Strike 31 The process data and the control data that have failed to be received can be reproduced using the past process data and the control data included in the current transmission text 31 even if the reception has failed.
[0035]
<< Other embodiments >>
In the second embodiment described above, the control command from the human interface device 24 received by the real-time data transmission unit 28 is supplied to the control unit 29 via the data editing unit 30. As in the embodiment shown in FIG. 1, the control command from the human interface device 24 received by the real-time data transmission unit 28 may be directly supplied to the control unit 29.
[0036]
Even in this case, similarly to the above-described second embodiment, even when the monitoring control cycle and the calculation cycle of the control device 23 are made shorter than the communication cycle and the process 22 is finely monitored and controlled, the control device 23, the process data and control data collected at 23 can reach the human interface device 24, the server device 25, etc. at high speed and reliably, thereby reducing the manufacturing cost. Hold down Large plant, Or Plants and the like that require high speed and certainty can be monitored and controlled.
[0037]
【The invention's effect】
As described above, according to the present invention, Even when the monitoring control cycle and calculation cycle of the control device are made shorter than the communication cycle and the process is closely monitored and controlled, the process data collected by the control device can be transferred to the human interface device, server device, etc. at high speed. And can be reached reliably, This makes it possible to monitor and control a large-scale plant or a plant that requires high speed and certainty while keeping the manufacturing cost low.
[0038]
In the supervisory control system according to claim 2, the supervisory control cycle and the computation cycle of the control device are made shorter than the communication cycle, and the process is finely monitored and controlled. When However, the process data collected by the control device can reach the human interface device, server device, etc. quickly and reliably, thereby reducing the manufacturing cost. Hold down Large plant, Or Plants and the like that require high speed and certainty can be monitored and controlled.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of a supervisory control system according to the present invention.
FIG. 2 is a schematic diagram showing an example of a transmission text used in the monitoring control system shown in FIG.
FIG. 3 is a block diagram showing a second embodiment of the supervisory control system according to the present invention.
4 is a schematic diagram showing an example of a transmission text used in the supervisory control system shown in FIG. 3. FIG.
FIG. 5 is a block diagram showing an example of a conventionally known supervisory control system.
[Explanation of symbols]
1, 2: Monitoring and control system
2, 22: Process
3, 23: Control device
4, 24: Human interface device (central processing unit)
5, 25: Server device (central processing unit)
6, 26: LAN (communication line)
7, 27: Process input / output section
8, 31: Transmission text
9: Data editing department
10, 12, 13, 28, 32, 33: Real-time data transmission unit
11, 29: Control unit
30: Data editing department

Claims (1)

A control command is supplied from the central processing unit to the control device via a communication line, and this control device collects device information while controlling the monitoring control target, while monitoring the monitoring control target based on the collected device information. In the supervisory control system that performs
The control device collects device information from the monitoring control target by operating in a monitoring control cycle having a cycle shorter by m times than the transmission cycle when transmitting device information to the central processing unit, and for the past n times When data is set to be bundled, each time a transmission cycle arrives, the current device information and the past m × n times of device information are combined into one transmission text and the communication line is connected to the central processing unit. While transmitting through
The central processing unit receives the current transmission text that has been transmitted, and based on the received current device information and the past m × n device information, restores past device information that failed to be received,
A supervisory control system characterized by that.

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