JP2004046718A - Plant monitor apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plant monitor controller for rapidly detecting the omission of an event report, reducing a network load so as to improve real-time property in an operation, evading operation stop impossibility, and enhancing reliability in the operation. <P>SOLUTION: A plant monitor apparatus includes: a controller for detecting the process state of a plant at each time, adding a count value to process state change presence information which is detected when the process state is changed; and a monitor device for detecting the continuity of the received count value, requesting whole process information to the controller being a transmission source when the count value is not continuous, and receiving the whole process information. When the controller detects the process state change information and does not detect a change in the process state within a prescribed time, the controller adds the count value to state change absence information, and reports it to the monitor device. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plant monitoring device that notifies process information of a plant via a network.
[0002]
[Prior art]
Conventionally, a plant monitoring device that monitors a process state of a plant includes a monitoring device having a man-machine interface function, a control device that exchanges data with a plant, and a network that connects the monitoring device and the control device. ing.
[0003]
Generally, as a method of transmitting process information from a control device to a monitoring device, there are a method of transmitting all process information at a fixed period and a method of transmitting only a change in process information.
[0004]
In the former method, when the number of input / output points is large, the transmission data increases, so that the network load is reduced by lengthening the transmission cycle. However, when the transmission cycle is lengthened, there is a disadvantage that the real-time monitoring is inferior.
[0005]
The latter method of transmitting only the change is a method for addressing the above-described drawbacks, and aims at reducing the network load and improving the real-time performance of monitoring.
[0006]
As an example, there is JP-A-2001-356801, and the plant monitoring device of the publication has the following configuration.
[0007]
As shown in FIG. 8, a conventional plant monitoring device 1 connects a monitoring device 2 having a man-machine interface function, a control device 3 for exchanging data with a plant, and the monitoring device 2 and the control device 3. The system includes a network 4, a notification unit 5 for notifying an operator, and an input / output unit 6 for inputting and outputting data to and from a plant.
[0008]
The monitoring device 2 monitors the plant based on the plant information sent from the control device 3. The monitoring device 7 detects a missing event notification by checking a transmission counter value added to the received TAG state change data. A TAG data processing unit 9 for notifying the control device 2 of a request for current data for all TAGs when an event notification omission is detected.
[0009]
The control device 3 has a data input / output unit 10 for sending process data taken in from the plant to a TAG data processing unit 11, and aggregating the sent data as TAG variable data for each sampling cycle, meaning each input point. TAG data processing unit 11, which generates monitoring information with TAG unit, detects a state change of TAG state change data, and determines whether to notify TAG state change data to monitoring device 2 based on the state change. State change detection unit 12, a transmission counter addition unit 13 that adds a transmission counter value to the TAG state change data and notifies the monitoring device 2 via the network 4, and a request from all TAG data request units 9 in the monitoring device 2. , The current data of all input points is acquired via the data input / output unit 10 and the contents of the TAG fixed information database 15b are referred to. While converting the current data of all the input points into the TAG format, and transmitting the TAG state change data relating to all the TAGs to the monitoring unit 7 in the monitoring device 2 via the transmission counter adding unit 13 and the counter checking unit 8. All TAG data processing units 14 for distribution are provided.
[0010]
Further, TAG fixed information databases 15a and 15b, which are used in common by the monitoring device 2 and the control device 3 and store fixed parameters for each input point in TAG units, are provided in the monitoring device 2 and the control device 3, respectively. I have.
[0011]
In the following, a description will be given of a conventional determination process regarding a missing event of the counter check unit 8 in the monitoring device 2, which is a main operation.
FIG. 9 is a timing chart for explaining a method of detecting a missing event notification.
First, at time t (n−1), when the transmission counter adding unit 13 in the control device 2 is notified from the state change detection unit 12 that a state change has occurred, the transmission counter addition unit 13 sets the current count value = n−2. 1 is added, and the count value = n−1 is added to the TAG state change data, and the monitoring apparatus 2 is notified.
[0012]
When receiving the TAG state change data, the counter check unit 8 in the monitoring device 2 refers to the current count value = n−1 from the TAG state change data, and the previous count value = n−2 and the current count value = N-1. When it is confirmed that the difference between these count values is 1 and the values are continuous, it is determined that the data transfer has been normally performed, and the previous count value is set to n-1.
[0013]
Next, at time t (n), when the state change detecting unit 12 notifies that the state change has occurred, the transmission counter adding unit 13 in the control device sets 1 to the current count value = n−1. In addition, the count value = n is added to the TAG state change data, and the monitoring device 2 is notified.
[0014]
Here, it is assumed that the event notification at the time t (n) has not been transmitted to the monitoring device 2. Subsequently, at time t (n + 1), when the state change detecting unit 12 notifies the transmission counter adding unit 13 in the control device that the state change has occurred, the transmission counter adding unit 13 adds 1 to the current counter value = n. , The count value = n + 1 is added to the TAG status change data, and the monitoring device 2 is notified.
[0015]
When the event notification is transmitted, the counter check unit 8 in the monitoring device 2 refers to the current count value = n + 1 from the TAG state change data, and compares the previous count value with the current count value.
[0016]
Here, since the event notification performed at the time t (n) has not been transmitted to the counter check unit 8, the previous count value held in the counter check unit 8 remains n-1.
[0017]
For this reason, the counter check unit 8 compares the previous count value = n−1 and the current count value = n + 1, and detects that the difference between these count values is 2. When detecting that the count value is not continuous with the difference = 2, the counter check unit 8 determines that an event notification omission has occurred.
[0018]
As described above, when the notification of the state change is realized using a protocol that cannot confirm delivery (for example, UDP / IP of Ethernet (registered trademark)), a count value that increases by one each time data is transmitted is included in the data. By using the method, the loss of event information can be detected on the receiving side.
[0019]
Further, when an event notification missing occurs, the monitoring device requests the process information of all operation points from the control device of the transmission source, and has the control device transmit the process information.
[0020]
[Problems to be solved by the invention]
However, in the plant monitoring apparatus as described above, as shown in the timing chart of FIG. 10, when the number of changes is small and the occurrence of a change notification only once is missing, or as shown in the timing chart of FIG. If the last one of the change notifications is missing, the counter check unit 8 in the control device 3 cannot detect it until the next event occurs, so that the occurrence of the missing event remains unrecognizable. was there.
[0021]
Further, even if an event is missed and recognized by the monitoring device 2, in the method of distributing data for all operation points from the monitoring device 2 to the control device 3, the amount of transmission data increases as the plant scale increases. However, there is a problem that a network load increases. On the other hand, it was conceived to prevent the problem of increasing the network load by lengthening the transmission cycle, but on the contrary, another problem occurred that the real-time operation was deteriorated.
[0022]
Furthermore, when the operator notifies the control device of the operation using a protocol that cannot confirm delivery, for example, when the opening operation is started by a valve opening operation and the opening operation is stopped at an appropriate opening degree, Although an instruction to execute the opening operation and an instruction to stop the opening operation are issued, if the instruction to stop the opening operation is not received, there is a danger that the operation cannot be stopped, that is, the valve is opened until the valve is fully opened.
[0023]
Accordingly, an object of the present invention is to provide a plant monitoring and control apparatus that quickly detects a missing event notification, reduces the network load, improves the real-time operation performance, avoids the inability to stop the operation, and improves the reliability of the operation. Is to provide.
[0024]
[Means for Solving the Problems]
In order to achieve such an object, a plant monitoring apparatus according to claim 1 detects a process state of a plant at predetermined time intervals, and detects a change in the process state when the process state changes. A control device that adds a count value to the information of the control device and transmits the count value to the monitoring device; and detects that the received count value is continuous. A monitoring device for requesting information and receiving the entire process information, wherein when the control device detects the process state change information and there is no change in the process state within a predetermined time, the control device Is characterized by adding a count value to the information indicating that there is no change in state and notifying the information to the monitoring device.
According to the plant monitoring device of the first aspect of the present invention, even when there is no change in the plant state, it is possible to reliably and quickly detect a missing event.
[0025]
A plant monitoring device according to claim 2, a control device for exchanging data with the plant, a monitoring device having a man-machine interface function for operating a dialog with an operator, and an operating unit for the operator to perform an operation. , The monitoring device notifies the control device of the operation information only when the operator performs an operation.
According to the plant monitoring device of the second aspect of the present invention, since only the execution of the operation is notified to the control device as an event, the real-time operation can be improved without increasing the network load.
[0026]
In the plant monitoring device according to the third aspect, in the plant monitoring device according to the second aspect, when the operator transmits information of the operation execution and the operation end from the monitoring device to the control device, the control device receives the information of the operation execution. When the information of the operation end is not received within a predetermined time, the control device ends the operation.
According to the plant monitoring device of the third aspect of the present invention, when transmitting the information of the operation execution and the operation end, it is possible to detect the omission of the operation end event even if the information of the operation end does not reach the control device. As a result, the inability to end the operation can be avoided.
[0027]
In the plant monitoring device according to claim 4, in the plant monitoring device according to claim 2, when the operator transmits information of the operation execution and the operation end from the monitoring device to the control device, the monitoring device transmits the operation execution information; When the operation end information is not transmitted within a predetermined time, the monitoring device notifies the control device of information indicating that there is no operation end information, and the control device ends the operation.
According to the plant monitoring device of the fourth aspect of the present invention, when notifying the event of the operation execution and the operation end, the control device detects a missing operation end event even if the operation end event has not reached the control device. As a result, the inability to end the operation can be avoided.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a plant monitoring device according to an embodiment of the present invention will be described with reference to the drawings.
[0029]
(First Embodiment)
FIG. 1 is a block configuration diagram of the plant monitoring device according to the first embodiment of the present invention.
In the figure, a plant monitoring device 51 for monitoring a plant includes a state change stop detecting unit 50 in a control device in addition to the configuration of the conventional plant monitoring device 1 shown in FIG. Further, the state change detection unit 52 at the preceding stage has a function of notifying the state change stop detection unit 50 of the state change information in addition to the function of the state change detection unit 12 of FIG.
[0030]
The state change stop detection unit 50 activates an internal timer every time state change information is received from the state change detection unit 52. Further, upon detecting that the internal timer times out, the state change stop detection unit 50 determines that the state change has not occurred for a predetermined time, and transmits so-called empty data without a state change. The data is transmitted to the monitoring device 2 via the counter adding unit 13.
[0031]
Hereinafter, the process of the state change stop detection unit 50 will be described with a specific example. FIG. 2 is a timing chart illustrating a method for detecting missing event notification according to the present embodiment.
As shown in the figure, at time t (n−1), the transmission counter adding unit 13 in the control device 53, when notified of the occurrence of the state change from the state change detecting unit 52, = N-2, and add the count value = n-1 to the TAG state change data to notify the monitoring device 2 and reset and restart the internal timer.
[0032]
When receiving the TAG state change data, the counter check unit 8 in the monitoring device 2 refers to the current counter value = n−1 from the TAG state change data, and sets the previous counter value = n−2 and the current counter value = N-1. Then, when it is confirmed that the difference between these count values is 1 and the values are continuous, it is determined that the data transfer has been normally performed, and the previous count value is set to n-1.
[0033]
Next, at time t (n), when the state change detection unit 52 notifies the transmission counter addition unit 13 in the control device 3 that a state change has occurred, the transmission counter addition unit 13 sets the current counter value = n−1 to 1 And adds the count value = n to the TAG state change data to notify the monitoring device 2, and resets and restarts the internal timer.
[0034]
Here, it is assumed that the event notification at the time t (n) has not been transmitted to the monitoring device 2.
[0035]
Next, the state change stop detection unit 50 in the control device 3 sets the internal timer when the state change notification is not notified from the state change detection unit 52 until time t (n + 1), which is a fixed time after time t (n). , And notifies the transmission counter adding unit 13 of empty data with no state change.
[0036]
When notified of empty data without a state change from the state change stop detecting section 50, the transmission counter adding section 13 adds 1 to the current counter value = n, and adds the count value = n + 1 to the TAG state change data. It is added to empty data that does not exist, and is notified to the monitoring device 2 as an event notification.
[0037]
When the event notification is transmitted, the counter check unit 8 in the monitoring device 2 refers to the current count value = n + 1 from the TAG state change data, and compares the previous count value with the current count value. Here, since the event notification performed at the time t (n) has not been transmitted to the counter check unit 8, the previous count value held in the counter check unit 8 remains n-1.
[0038]
Therefore, the counter check unit 8 compares the previous counter value = n−1 and the current counter value = n + 1 and detects that the difference between these count values is 2. When recognizing that the counter value is not continuous from the difference = 2, the counter check unit 8 determines that an event notification omission has occurred.
[0039]
In the normal case, when transmitting the TAG state change data when an event occurs, the count value is incremented and transmitted in addition to the transmission data, and the reception side checks the count value, but the event occurs for a predetermined period or more. If not, send empty data.
[0040]
According to the present embodiment, even when there is no change in the plant state, by sending an empty event notification after a predetermined time, it is possible to reliably and promptly detect a missing event, and leave the missing event unattended. Therefore, the reliability of the plant can be improved.
[0041]
(Second embodiment)
FIG. 3 is a block configuration diagram of the plant monitoring device according to the second embodiment of the present invention.
As shown in the figure, a plant monitoring device 71 for monitoring a plant includes a monitoring device 72 having a man-machine interface function for performing an interactive operation with a user, and a control device for exchanging data with the plant. 73, a network 4 connecting the monitoring device 72 and the control device 73, a notifying device 5 for notifying the operator, an operating device 74 for the operator to operate, and data input / output between the plant. And input / output means 6 for outputting.
[0042]
The monitoring device 72 includes a monitoring unit 7 that monitors the plant based on the plant information sent from the control device 73, an operation detection unit 75 that detects an operation performed by the operation unit 74, and an operation detection unit 75 that detects the operation. An operation requesting unit 76 for notifying the controller 73 of the operation performed is provided.
[0043]
The control device 73 includes a data input / output unit 70 for transmitting data taken in from the plant to the monitoring device 72 via the network 4 and an input / output unit 6 via the data input / output unit when receiving an operation request from the monitoring device 72. And an operation processing unit 77 for notifying the user.
[0044]
Here, the monitoring device 72 notifies the control device 73 via the operation requesting unit 76 of the operation only when the operation detection unit 75 detects the operation performed by the operation unit 74.
[0045]
Conventionally, as a method of transmitting an operation command from the monitoring device 2 to the control device 3, a method of requesting data for all operation points, such as an all TAG data request unit 9 in FIG. 8, has been adopted.
[0046]
However, in the present embodiment, since only the operation instruction, that is, the execution instruction related to the operation is notified to the control device, it is possible to suppress an increase in the network load, and as a result, it is possible to improve the real-time property of the operation. it can.
[0047]
(Third embodiment)
FIG. 4 is a block configuration diagram of a plant monitoring device according to the third embodiment of the present invention.
3, a plant monitoring device 81 is based on a format for notifying operation execution and operation completion. In addition to the configuration of the plant monitoring device 71 of FIG. An operation monitoring unit 88 for stopping the operation when detecting that the operation stop does not arrive within a predetermined time is provided.
[0048]
Hereinafter, the processing of the operation monitoring unit 88 will be described with a specific example.
FIG. 5 is a timing chart illustrating the operation monitoring unit 88 according to the present embodiment.
[0049]
At time t (n−2), the operation request unit 76 in the monitoring device 72 notifies the operation detection unit 75 that an operation execution event has occurred based on the operation format of notifying the event of the operation execution and the operation end. Then, the control device 83 is notified.
[0050]
When receiving the operation execution command, the operation monitoring unit 88 in the control device 83 resets and restarts the internal timer, and notifies the operation processing unit 77 of the operation execution command. The operation processing unit 77 outputs an operation command to the plant via the data input / output unit 70 and the input / output unit 6.
[0051]
At time t (n−1), similarly to the above, the operation requesting unit 76 in the monitoring device 72 sends an operation execution event from the operation detection unit 75 based on the operation format for notifying the event of the operation execution and the operation end. When the occurrence is notified, the control unit 83 is notified.
[0052]
When receiving the operation execution command, the operation monitoring unit 88 in the control device 83 resets and restarts the internal timer, notifies the operation execution command to the operation processing unit 77, and the operation processing unit 77 An operation command is output to the plant via the input / output means 6.
[0053]
At time t (n), similarly to the above, the operation requesting unit 76 in the monitoring device 72 determines that the operation execution event has occurred based on the operation format for notifying the event of the operation execution and the operation end. When notified from 75, the control device 83 is notified.
Here, it is assumed that the event notification at the time t (n) has not been transmitted to the control device 83.
[0054]
The operation monitoring unit 88 in the control device 83 detects the timeout of the internal timer when the operation is not notified from the operation requesting unit 76 from time t (n-1) to time t (n + 1) after a certain period. It is determined that the operation has been stopped, and the operation processing unit 77 is notified of the end of the operation.
[0055]
As described above, when notifying the event of the operation execution and the operation end, if the operation end event does not reach the control device, the control device determines that the operation has ended after a predetermined time, and the operation end event is omitted. Detection can be performed, and the reliability of the operation can be improved.
[0056]
(Fourth embodiment)
FIG. 6 is a block diagram illustrating a configuration of a plant monitoring device according to the fourth embodiment of the present invention.
3, a plant monitoring device 101 for monitoring a plant includes an operation requesting unit 106 instead of the operation requesting unit 76 in the configuration of the plant monitoring device 71 in FIG.
[0057]
The operation request unit 106 detects that no operation command has arrived from the operation detection unit 75 for a predetermined period, and notifies the control device 83 of information indicating that there is no operation command.
[0058]
Hereinafter, the process of the operation requesting unit 106 will be described with a specific example.
FIG. 7 is a timing chart illustrating the operation requesting unit 106 according to the fourth embodiment of the present invention.
[0059]
At time t (n−2), the operation requesting unit 106 in the monitoring device 102 notifies the operation detecting unit 75 of the occurrence of the operation execution event based on the operation format of notifying the event of the operation execution and the operation end. Then, the internal timer is reset and restarted, and the control device 73 is notified.
[0060]
When receiving the operation execution command, the operation processing unit 77 in the control device 73 outputs the operation command to the plant via the data input / output unit 70 and the input / output unit 6.
[0061]
At time t (n−1), similarly to the above, the operation request unit 106 in the monitoring apparatus 102 determines that the operation execution event has occurred based on the operation format of notifying the operation execution and operation end events. When notified by the detection unit 75, the internal timer is reset and restarted, and the control unit 73 is notified.
[0062]
When receiving the operation execution command, the operation processing unit 77 in the control device 73 outputs the operation command to the plant via the data input / output unit 70 and the input / output unit 6.
[0063]
At time t (n), similarly to the above, the operation requesting unit 106 in the monitoring device 106 determines that the operation execution event has occurred based on the operation format of notifying the event of the operation execution and the operation end. When notified from 75, the internal timer is reset and restarted, and the control device 73 is notified.
Here, it is assumed that the event notification at the time t (n) has not been transmitted to the control device 73.
[0064]
The operation requesting unit 106 in the monitoring device 106 detects that the internal timer has timed out when the operation command is not notified from the operation detecting unit 75 from time t (n) to time t (n + 1) after a certain period, The operation processing unit 77 is notified of information indicating no operation command.
[0065]
When receiving the information without the operation command, the operation processing unit 77 determines that the operation has been stopped, and notifies the data input / output unit 70 of the end of the operation.
[0066]
According to the present embodiment, when the monitoring device notifies the event of the operation execution and the operation end, the monitoring device performs the operation execution event notification, and when the operation end event notification is not performed for a predetermined period, By transmitting information indicating that there is no operation command from the monitoring device to the control device, and determining that the operation has been completed on the control device side, it is possible to detect a missing operation end event.
[0067]
As a result, even if the operation end event is missed, it is possible to avoid a situation in which the operation is not completed and the process of executing the operation is continuously performed, and the reliability of the operation can be improved.
[0068]
【The invention's effect】
As described above, the reliability of the operation of the plant monitoring device can be improved as follows.
[0069]
According to the plant monitoring device of the first aspect of the present invention, when there is no change in the plant state within a predetermined time, the event notification without the state change is performed, so that the missing event can be detected reliably and quickly.
[0070]
According to the plant monitoring device of the second aspect of the present invention, the real-time operation can be improved without increasing the network load by notifying the control device of only the execution related to the operation as the operation execution event. .
[0071]
According to the plant monitoring device of the third aspect of the present invention, when notifying the event of the operation execution and the operation end, even if the operation end event does not reach the control device, the control device side completes the operation after a predetermined time. Thus, it is possible to detect the omission of the operation end event and avoid the inability to end the operation.
[0072]
According to the plant monitoring device of the fourth aspect of the present invention, when notifying the event of the operation execution and the operation end, even if the operation end event does not reach the control device, the operation is performed from the monitoring device for a certain period. If there is no operation command, by transmitting information without an operation command, the control device determines that the operation has ended, thereby detecting an omission of the operation end event and avoiding the inability to end the operation.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram of a plant monitoring device according to a first embodiment of the present invention.
FIG. 2 is a timing chart illustrating a method for detecting missing event notification according to the first embodiment of the present invention.
FIG. 3 is a block configuration diagram of a plant monitoring device according to a second embodiment of the present invention.
FIG. 4 is a block configuration diagram of a plant monitoring device according to a third embodiment of the present invention.
FIG. 5 is a timing chart illustrating a method for detecting an operation stop according to a third embodiment of the present invention.
FIG. 6 is a block configuration diagram of a plant monitoring device according to a fourth embodiment of the present invention.
FIG. 7 is a timing chart illustrating a method for detecting an operation stop according to a fourth embodiment of the present invention.
FIG. 8 is a block diagram of a conventional plant monitoring apparatus.
FIG. 9 is a timing chart illustrating a method of detecting a missing event in a conventional plant monitoring device.
FIG. 10 is a timing chart for explaining Case 1 in which a missing event of a conventional plant monitoring device cannot be detected.
FIG. 11 is a timing chart for explaining Case 2 in which a missing event of a conventional plant monitoring device cannot be detected.
[Explanation of symbols]
1, 51, 71, 81, 101: Plant monitoring device, 2, 72, 102: Monitoring device, 3, 53, 73, 83: Control device, 4: Network, 5: Notification unit, 6 input / output unit, 7 monitoring unit, 8 counter check unit, 9 TAG data request unit, 10, 70 data input / output unit, 11,. · TAG data processing unit, 12, 52 ··· state change detection unit, 13 ··· transmission counter addition unit, 14 · · · all TAG data processing unit, 15a, 15b · · · TAG fixed information database, 50 ··· A state change stop detection unit, 74 ... operation means, 75 ... operation detection unit, 76, 106 ... operation request unit, 77 ... operation processing unit, 88 ... operation monitoring unit

Claims (4)

A control device that detects a process state of the plant at predetermined time intervals and, when there is a change in the process state, adds a count value to the detected information indicating the change in the process state and transmits the information to the monitoring device; A plant that has a monitoring device that detects that the count values are continuous, requests all the process information from the control device of the transmission source when the count value is discontinuous, and receives the all process information. In the monitoring device,
When the control device detects the process state change information and there is no change in the process state within a predetermined time, the control device notifies the monitoring device by adding a count value to the information of no state change. Features plant monitoring equipment. A control device for exchanging data with the plant, a monitoring device having a man-machine interface function for operating a dialogue with an operator, and a plant monitoring device including an operating means for the operator to perform an operation,
The plant monitoring device, wherein the monitoring device notifies the control device of operation information only when an operator performs an operation. When the operator transmits the information of the operation execution and the operation end from the monitoring device to the control device, when the control device receives the information of the operation execution and does not receive the information of the operation end within a predetermined time, 3. The plant monitoring device according to claim 2, wherein the control device completes the operation. When the operator transmits information of the operation execution and the operation end from the monitoring device to the control device, when the monitoring device transmits the information of the operation execution and does not transmit the operation end information within a predetermined time, The plant monitoring device according to claim 2, wherein the monitoring device notifies the control device of information indicating that there is no operation end information, and the control device completes the operation.

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