JPH07282090A - Data collecting system - Google Patents

Abstract

PURPOSE:To speedily cope with the sudden change of important monitoring data by collecting data with a preferred rate from a controller with a larger changing rate of important monitoring data. CONSTITUTION:At the time of receiving collected data from the controller, a changing rate calculation means 14 refers to an important data setting means 13 and when collected data is important monitoring data, the means 14 calculates the changing rate of this time value as against a last time value in important monitoring data. Then, a priority station writing means 15 compares the changing rate calculated by the changing rate calculating means and a changing rate limit value in an important data setting means, and when the changing rate is over a changing rate limit value as the result of this comparing, the means 15 writes priority station indicating information showing a controller sending important monitoring data into a priority station storage means 16. Then, when the priority station storage means is provided with priority station indicating information, an interruption collecting means 17 transmits a polling signal to the controller indicated in the priority station indicating information with the rate more preferential than the other controllers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data collection system in which a monitoring device sequentially transmits a polling signal to each controller and collects data from a destination controller, and particularly from a controller having a large change rate of important monitoring data. The present invention relates to a data collection method capable of promptly responding to a sudden change in important monitoring data by collecting data at a priority rate.

[0002]

2. Description of the Related Art Conventionally, when collecting data from a plurality of controllers by a monitoring device, the monitoring device transmits a data request command (polling signal) to each controller in a predetermined order such as a station address and receives the data request command. A polling / selecting method in which the controller sends collected data to a monitoring device is widely used.

FIG. 7 is a schematic diagram showing a transmission procedure by such a data collection system. In the figure, the monitoring device 1
Is connected to a plurality of controllers 2 ₁ to 2 _n, sequentially transmits the data request command to each controller 2 ₁ to 2 _n,
The collected data returned from the destination controller 2 is displayed.

8 to 10 are flowcharts for explaining the operation of such a monitoring device or each controller, and FIGS. 11 and 12 are schematic diagrams showing the structure of the transmission text of this monitoring device or each controller. is there.

As shown in FIG. 8, the monitoring device sets the data request destination controller station number to an initial value of 1 (ST
1) As shown in FIG. 11, a data request command text including a header, a data request destination controller number, a data request command, and an FCS (frame check sequence) is created (ST2), and this data request command text is transmitted to the controller 1. Yes (ST3).

As shown in FIG. 9, the controller determines whether or not a data request command destined for its own station has been received (ST4), and when the determination result indicates no reception, the process returns to step ST4 and the determination result is When indicating that there is reception, FIG.
As shown in, header, own controller number, PV
Value, MV value, ..., Digital input value, Analog input value and FCS are created (ST)
5) Execute the process of transmitting this response data transmission text to the monitoring device (ST6) When step ST3 is completed, the monitoring device determines whether or not there is a response from the controller as shown in FIG. 10 (ST
7), when the determination result shows that there is no response, step ST7
When the determination result indicates that there is a response, it is determined whether or not there is an error in the response data transmission text (ST8).
Note that transmission processes such as retries and timeouts may be executed in steps ST7 to ST8.

When the determination result in this step ST8 indicates that there is an error, the monitoring device returns to step ST2 to request the data again, and when the determination result indicates that there is no error, the received collected data is stored in the RAM, It is also displayed (ST9).

Further, the monitoring device judges whether or not such collected data has been collected from all the n controllers (ST10), and when the judgment result indicates that the collected data has not been collected from all the controllers, Update the data request destination controller station number by +1 to calculate the next station number (ST
11) Return to step ST2, and when the determination result indicates that collection has been completed from all controllers, repeat step S to collect new data from the first controller.
Return to T1. Hereinafter, as described above, the monitoring device sequentially executes data collection from each controller.

[0009]

However, in the above-mentioned data collection method, since the monitoring device collects data from each controller in a predetermined order, there is a problem that the display update cycle of data is always constant. .

That is, since the display update cycle of the data is constant, it may take some time before the data changed by the controller is displayed on the monitoring device. For example, the display is updated immediately if the collection order is changed immediately after the data is changed, but if the data is changed immediately after the collection order has passed due to bad timing, do not wait until the next collection order is reached. Then, there is a problem that the display is not updated.

This problem does not have a bad influence particularly when the number of controllers is small because the time until the next collection order comes around is short. However, when the number of controllers increases, the control of the plant begins to be adversely affected.

Further, since the data collection frequency is the same in the controller in which the data changes frequently and in the controller in which the data hardly changes, it takes time to display the data of the controller in which the data changes suddenly, which causes inconvenience in plant operation. Can occur.

The present invention has been made in consideration of the above situation, and collects data at a priority rate from a controller having a large rate of change of important monitoring data, so that even when the important monitoring data changes suddenly The purpose is to provide a possible data collection method.

[0014]

According to the present invention, a plurality of controllers are connected to a monitoring device, and when each controller receives a polling signal transmitted individually from the monitoring device, the corresponding controller receives the collected data. In the data collection method of returning to the monitoring device, as the monitoring device, priority station storage means in which priority station instruction information is written, important monitoring data of the collected data for each controller and the important monitoring data When the collected data is received from the controller and the important data setting means for setting the rate of change limit value, referring to the important data setting means, when this collected data is important monitoring data, The change rate calculating means for calculating the change rate of the current value with respect to the value, and the change rate calculating means The rate of change and the corresponding change rate limit value in the important data setting means are compared, and as a result of this comparison, when the change rate exceeds the change rate limit value, the controller that has sent the important monitoring data is indicated. Priority station writing means for writing priority station instruction information in the priority station storage means; and when the priority station storage means has priority station instruction information, the controller instructed by the priority station instruction information has a higher priority than other controllers. It is a data collection system provided with an interrupt collection means for transmitting the polling signal at a priority rate.

[0015]

Therefore, according to the present invention, by taking the above-mentioned means, the priority station storage means in which the priority station instruction information is written and the important monitoring data among the collected data for each controller and the change of the important monitoring data are obtained. An important data setting means for setting the rate limit value is provided, and when the change rate calculating means receives the collected data from the controller, referring to the important data setting means, the collected data is important monitoring data The rate of change of the current value with respect to the previous value in the monitoring data is calculated, and the priority station writing unit calculates the rate of change calculated by the rate of change calculating unit and the corresponding change rate limit value in the important data setting unit. When the rate of change exceeds the rate-of-change limit value as a result of this comparison, priority station instruction information indicating the controller that sent the important monitoring data is written to the priority station storage means, and the interrupt receipt is recorded. When the priority station storage means has priority station instruction information, the means transmits the polling signal to the controller instructed by the priority station instruction information at a priority over other controllers, so that the rate of change of important monitoring data is large. By collecting data from the controller at a priority rate, it is possible to quickly respond even when the important monitoring data changes suddenly.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a monitoring system applied to a data collection method according to an embodiment of the present invention. In this monitoring system, the monitoring device 11 is a LAN 1
, F are connected to a plurality of controllers A, B ,.

The monitoring device 11 is provided with a specific data registration section 13 as important data setting means, a change rate calculation section 14, a priority station writing section 15, a priority station storage section 16 and an interrupt collection section 17.

As shown in FIG. 2, the specific data registration unit 13 changes rate monitoring data type (important monitoring data) of collected data for each controller A, B, ..., F and this rate of change monitoring data type. This is a memory in which the change rate limit value of is set.

As shown in FIG. 3, the change rate calculating section 14 has a previous value area 14a for storing the previous collected data for each controller A, B, ..., F, and each controller A, B ,. When the response data transmission text is received from F, ..., Based on the change rate monitoring data type registered in the specific data registration unit 13 among the collected data included in this response data transmission text, the previous value areas a, b, , F to calculate the rate of change of the current collection data with respect to the previous collection data, and give the calculation result to the priority station writing unit 15.

The response data transmission text is the same as the conventional one, and as shown in FIG. 12, the header, the controller number of the own station, the PV value, the MV value, ..., The digital input value, the analog input value, and the FCS. It is configured to include. The PV value, MV value, ..., Digital input value and analog input value are data parts. Further, in the previous value areas a, b, ..., F, as shown in FIG. 3, the previous collected data is stored in the same format as the data portion of the response data transmission text.

The priority station writing section 15 compares the change rate given from the change rate calculating section 14 with the corresponding change rate limit value in the specific data registration section 13, and as a result of this comparison, the change rate is found. When the change rate limit value is exceeded, a data request frequency change flag is set, and the priority station number (priority station instruction information) indicating the controller that sent the collected data with this change rate this time
Is written in the priority station storage unit 16.

The interrupt collecting unit 17 is provided for each controller A,
A function of sequentially transmitting data request command texts to B, ..., F, and at the time of this transmission, when the priority station storage unit 16 has a priority station number, the number of times of data collection execution after the priority station number is stored is set. Priority ratio counter (not shown)
Of the data request command text to the controller designated by the priority station number in the priority station storage unit 16 based on the count value of the Further, it has a function of executing update display processing of collected data collected by these data request command texts. Here, the unique value of the system is a system-specific priority ratio set corresponding to the system, and indicates how many times of data collection one data collection is executed from the priority controller. .

The data request command text is the same as the conventional one, and as shown in FIG. 11, the header, the data request destination controller number, the data request command, and the F
It is composed of CS.

Next, a data collection method in such a monitoring system will be described with reference to the flowcharts of FIGS. 4 and 5. First, in the monitoring device 11, the interrupt collection unit 17 sets the initial values of the priority station number and the priority ratio counter to zero (ST21), and sets the initial value of the station number to 1 (ST22).

Subsequently, the interrupt collection unit 17 determines whether or not the priority ratio counter has reached the unique value "m", for example, the unique value "3" (ST23), and the determination result is the unique value "1" of the priority ratio counter. When the number reaches 3 ", the priority ratio counter is reset to zero, and the collection station number is used as the priority station number in order to interrupt the collection from the priority station in the order of collecting from the regular collection station. 1 is subtracted from (ST24), but in this case, since the determination result does not yet indicate that the priority ratio counter has reached “2”, the collection station number (=
1) is the station number (= 1) (ST25), and the data request command text is created corresponding to the collection station number.
This data request command text is transmitted to the controller A to execute data collection (ST26).

The controller A judges whether or not the data request command text addressed to its own station is received. When the judgment result shows that no reception is received, the controller A waits for a predetermined time and executes the judgment again. At this time, the response data transmission text is created in the same manner as in the conventional case, and the created response data transmission text is transmitted to the monitoring device 11.

On the other hand, when the monitoring device 11 receives the response data transmission text from the controller A, the change rate calculation unit 14 registers the controller data registered in the specific data registration unit 13 among the collected data included in the response data transmission text. Based on the change rate monitoring data type of A, the previous value of the collected data corresponding to this change rate monitoring data type is read from the previous value area a, and the previous collected data and this time are collected as shown in the following equation (1). Calculate the rate of change from the collected data (S
(T27), this calculation result is given to the priority station writing unit 15, and the current collection data is written in the previous value area a.

Rate of change = (collected data of this time-collected data of previous time) / range (1) The priority station writing unit 15 determines the ratio of change and the specific data registration unit 1
The change rate limit value in 3 is compared to determine whether the change rate exceeds the change rate limit value (ST28), and the determination result is that the change rate is large and exceeds the change rate limit value. At this time, the data request frequency change flag is set to "1" (ST
29) In this case, since the determination result indicates that the change rate is within the limit value, the data request frequency change flag is reset to "0" (ST30).

Subsequently, the priority station writing section 15 judges whether or not the data request frequency change flag is "1" in order to judge the magnitude of the data change rate (ST31), and this judgment result is When the flag indicates "1", it is determined whether or not the priority station number is zero in order to determine whether or not the priority station is already set in the priority station storage unit 16 (ST3
2) When this determination result shows that the priority station number is zero, after setting the priority station number in the priority station storage unit 16 to the current collection station number (ST33), the station number (= 1) is updated by +1 (ST).
34), when the determination result in step ST32 indicates that the priority station number is not zero, the process proceeds to step ST39.

In this case, since the determination result in step ST31 indicates that the flag is "0", the priority station number and the collection station number are subsequently determined to determine whether or not the flag of the current priority station is reset. Is determined (ST35), and when the determination result shows a match, the priority station number and the priority ratio counter are reset to zero (ST3).
6) In this case, since the determination result shows a mismatch, the process goes to step ST34.

Next, the interrupt collection unit 17 performs step ST3.
When the update (= 2) of the station number in 4 is completed, it is determined whether or not the priority station number is not zero in order to determine whether or not the priority station number is set in the priority station storage unit 16 (ST3
7) When the judgment result indicates that the priority station number is not zero, the priority ratio counter is updated by +1 (ST38). In this case, since the judgment result indicates that the priority station number is zero, there is no priority station. Set the ratio counter to zero (ST3
9).

Thereafter, the interrupt collection unit 17 determines whether or not data collection from all the controllers A to F has been completed (S
T40), when the determination result indicates that the data collection from all the controllers A to F has been completed, the station number is initialized and the process returns to step ST22 to repeat the data collection. Since it indicates that the data collection from F to F is not completed, the process returns to step ST23 to execute the data collection from the next controller B.

This completes the data collection for the controller A. Next, the data collection for the controller B will be described. It is assumed that the data is suddenly changed in the controller B.

In the monitoring device 11, since the priority ratio counter (= 0) has not reached the eigenvalue "3" in step ST23, the interrupt collecting unit 17 matches the collecting station number with the station number (= 2) in step ST25. Then, the data request command text is transmitted to the controller B in step ST26.

As described above, the controller B receives the data request command text, and thereafter sends the response data transmission text to the monitoring device 11. Monitoring device 11
, The priority station writing unit 15 determines that the data request frequency change flag is “1” in step ST31, determines that the priority station number is not set yet (= 0) in step ST32, and determines in step ST33. In step ST34, the priority station number is set to match the collection station number (= 2), and thereafter, in step ST34, the station number is updated by +1 (= 3).

Subsequently, in the monitoring device 11, the interrupt collection unit 17
Determines that the priority station number (= 2) is not zero in step ST37, updates the priority ratio counter by +1 (= 1) in step ST38, and returns to step ST23 in step ST40.

Next, the data collection for the controller C will be described. It is assumed that the data is not suddenly changed in the controller C. As described above, in the monitoring device 11, the count value (=
1) has not reached the eigenvalue “3”, the interrupt collection unit 1
7 collects the station number in the step ST25 (=
The data request command text is transmitted to the controller C in step ST26.

The controller C receives the data request command text, and thereafter sends the response data transmission text to the monitoring device 11. In the monitoring device 11, the priority station writing unit 15 determines that the data request frequency change flag is “0” in step ST31, and the priority station number (= 2) and the collection station number (= 3) are different in step ST32. It is determined that the flag "0" is not the reset of the current priority station, and the station number is updated by +1 (= 4) in step ST34.

Subsequently, in the monitoring device 11, the interrupt collection unit 17
Determines that the priority station number (= 2) is not zero in step ST37, updates the priority ratio counter by +1 (= 2) in step ST38, and returns to step ST23 in step ST40.

Subsequently, the monitoring device 11 collects data from the controller D as described above. The controller D
Indicates that there is no sudden change in the data. In addition, after collecting the data, the station number is updated by +1 in step ST34 and becomes 5
The priority ratio counter is updated by +1 in step ST38 to become 3.

Next, the case where the controller B, which is the priority station, interrupts the data collection for the controller E will be described. It is assumed that the data is suddenly changed in the controller B.

In the monitoring device 11, the interrupt collecting unit 17 determines the count value (=) of the priority ratio counter in step ST23.
3) is determined to have reached the eigenvalue “3”, and step ST
At 24, the priority ratio counter is reset to zero so that the collection station number matches the priority station number (= 2), and 1 is subtracted (= 4) from the station number (= 5).

After that, the interrupt collecting unit 17 determines in step ST.
At 26, the data request command text is transmitted to the controller B corresponding to the collection station number (= 2). As described above, the controller B receives the data request command text, and thereafter sends the response data transmission text to the monitoring device 11.

In the monitoring device 11, the priority station writing unit 15 determines in step ST31 that the data request frequency change flag is "1", and determines in step ST32 that the priority station number has already been set (= 2). Then, in step ST34, the station number (= 4) is updated by +1 (=
5) Do.

Subsequently, in the monitoring device 11, the interrupt collecting unit 17
Determines that the priority station number (= 2) is not zero in step ST37, updates the priority ratio counter by +1 (= 1) in step ST38, and returns to step ST23 in step ST40.

Thereafter, as described above, the monitoring device 11 collects data from the next controller E. As described above, the monitoring apparatus sets the system unique value for the priority ratio counter to “3”, and thus sequentially executes the data collection process, with one of the three data collections as the collection from the priority station.

That is, as shown in FIG. 6, this data collection processing is performed by A, B, C, D, B, E, F, B, A,
B, B, ..., The data collection of the controller B, which is the priority station, is interrupted at the priority rate corresponding to the eigenvalue.

Further, when the sudden change in the data is resolved in the controller B, the monitoring device 11 proceeds to step ST3.
In step 1, the data request frequency change flag is determined to be "0". In step ST35, it is determined whether or not the priority station number (= 2) and the collection station number (= 2) match. In ST36, the priority station number and the priority ratio counter are reset to zero, and step ST34
go to.

After that, since the priority station number and the priority ratio counter are reset to zero, the priority processing is not performed and the data collection processing is executed in the order of the normal controller numbers. Further, when the data is suddenly changed in another controller while the sudden change in the data is not resolved in the controller B, the monitoring device determines the data request frequency flag to be "1" in step ST31, and the priority station number is "0" in step ST32. Or not.

Here, the priority station number of controller B (=
Since 2) has already been set, the monitoring device 11 goes to step ST34. That is, the monitoring device 11 stores only one priority station number, and until the data request frequency change flag of the currently prioritized controller B is reset to "0",
Do not store a new priority station number. Thereby, the monitoring device 1
1 reliably executes data collection for priority stations.

As described above, according to this embodiment, when the change rate calculation unit 14 receives the response data transmission text including the collected data from the controller, the specific data registration unit 1
When the collected data is the registered change rate monitoring data type with reference to 3, the change rate of the current value with respect to the previous value in the collected data is calculated, and the priority station writing unit 15
Compares this rate of change with the corresponding rate-of-change limit value, and as a result of this comparison, when the rate of change exceeds the rate-of-change limit value, sets the priority station number indicating the controller that sent the collected data, and When the built-in collection unit 17 determines that the priority station number is set in the priority station storage unit 16, it transmits the data request command text to the controller designated by the priority station number at a priority over other controllers. By collecting data at a priority rate from the controller having a large change rate of the important monitoring data, it is possible to quickly respond even when the important monitoring data suddenly changes.

Further, according to the present embodiment, among the collected data, only the important monitoring data is registered in the specific data registration unit 13 to monitor the sudden change of the change rate, so that the degree of freedom of system construction can be improved. You can

Further, according to the present embodiment, the specific data registration unit 13 and the change rate calculation unit 14 are normally provided in the monitoring device 11 having a CPU higher in performance than the controller, so high-speed processing is expected. be able to. Further, similarly, since the specific data registration unit 13 and the change rate calculation unit 14 are provided in the monitoring device 11, the setting can be easily changed, and in addition, for example, when the stable state of the change rate continues, the settings are automatically deleted. It is possible to intervene with an application program such as a program.

In addition, according to the present embodiment, the data collection frequency from the monitoring device 11 is changed without using the state change notification, which is a technique of spontaneously transmitting a sudden change in data from the controllers A to F. It is possible to give priority to the data collection from the controller B in which the sudden change has occurred.

Further, since the state change notification is not used as described above, there is a problem that the protocol is complicated and time-consuming due to the state change notification, and when the state change notifications are simultaneously issued from the respective controllers, Problems such as control difficulty can be avoided. In addition, the present invention can be modified in various ways without departing from the scope of the invention.

[0056]

As described above, according to the present invention, the priority station storage means in which the priority station instruction information is written and the important monitoring data of the collected data for each controller and the change rate limit value of the important monitoring data. When the change rate calculation means receives the collected data from the controller and the collected data is important monitoring data by referring to the important data setting means, in the important monitoring data, The change rate of the current value with respect to the previous value is calculated, and the priority station writing means compares the change rate calculated by this change rate calculation means with the corresponding change rate limit value in the important data setting means. As a result of this comparison, when the rate of change exceeds the rate-of-change limit value, priority station instruction information indicating the controller that has transmitted the important monitoring data is written in the priority station storage means,
When the priority station storage means has priority station instruction information, the interrupt collecting means sends a polling signal to the controller designated by the priority station instruction information at a priority over other controllers. By collecting data from a controller with a high rate at a priority rate, it is possible to provide a data collection method that can quickly respond even when important monitoring data changes suddenly.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a monitoring system applied to a data collection method according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a specific data registration unit in the embodiment.

FIG. 3 is a configuration diagram of a previous value area in the example.

FIG. 4 is a flowchart for explaining the operation of the monitoring device in the embodiment.

FIG. 5 is a flowchart for explaining the operation of the monitoring device in the embodiment.

FIG. 6 is a time chart for explaining an interrupt operation of data collection in the embodiment.

FIG. 7 is a schematic diagram showing a transmission procedure by a conventional data collection method.

FIG. 8 is a flowchart for explaining the operation of the conventional monitoring device.

FIG. 9 is a flowchart for explaining the operation of a conventional controller.

FIG. 10 is a flowchart for explaining the operation of the conventional monitoring device.

FIG. 11 is a block diagram of a conventional data request command text.

FIG. 12 is a configuration diagram of a conventional response data transmission text.

[Explanation of Codes] 11 ... Monitoring device, 12 ... LAN, 13 ... Specific data registration unit, 14 ... Change rate calculation unit, 15 ... Priority station writing unit, 16 ...
Priority station storage unit, 17 ... Interrupt collection unit, A to F ... Controller, a to f ... Previous value area.

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Claims (1)

[Claims] 1. A data collection system in which a plurality of controllers are connected to a monitoring device, and when each controller receives a polling signal that is sequentially and individually transmitted from the monitoring device, the corresponding controller returns collected data to the monitoring device. In the method, the monitoring device is configured such that priority station storage means in which priority station instruction information is written, important monitoring data of collected data for each controller, and a change rate limit value of the important monitoring data are set. When the collected data is received from the data setting means and the controller, when the collected data is important monitoring data by referring to the important data setting means, the change of the current value with respect to the previous value in the important monitoring data Change rate calculating means for calculating the rate, the change rate calculated by the change rate calculating means, and the important data setting procedure Comparing the corresponding rate of change limit value of the inner,
As a result of this comparison, when the rate of change exceeds the rate of change limit value, priority station writing means for writing priority station instruction information indicating the controller that has sent the important monitoring data in the priority station storage means, When the priority station storage means has priority station instruction information, an interrupt collection means for transmitting the polling signal to the controller indicated by the priority station instruction information at a priority over other controllers is provided. Data collection method.