JP3016975B2 - Process monitoring control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process monitoring control system in which data of a control node for performing process control is collected by a monitoring node.

[0002]

2. Description of the Related Art FIG. 4 is a flowchart showing the operation of a conventional process monitoring control system. In the figure, steps ST11 to ST14 are operations for controlling a monitoring screen in the monitoring node, steps ST26 to ST29 are operations for controlling communication in the monitoring node, and steps ST36 to ST38 are for controlling. 9 illustrates an operation for controlling communication within a node.

Next, the operation will be described. The control node controls the process, and the monitoring node collects process I / O data (hereinafter, referred to as process data) of the control node via a communication line. The monitoring screen control unit of the monitoring node generates communication data to collect process data necessary for displaying the monitoring screen (step ST11), and issues a communication request to the communication control unit (step ST12).

[0004] Upon receiving the communication request (step ST26), the communication control unit transmits a process data read command to the control node via the communication line (step ST27). The communication control unit of the control node that has received the read command (step ST36) collects the process data requested by the read command via the process input / output unit connected to the process (step ST3).
7). After the collection is completed, the process data is returned to the monitoring node via the communication line (step ST3).
8).

[0005] When the process data is received by the communication control unit of the monitoring node (step ST28), it is transferred to the monitoring screen control unit (step ST29). Then, when the monitoring control unit receives the process data (step S
T13) The monitoring screen on the CRT is updated based on the data (step ST14).

[0006]

Since the conventional process monitoring control system is configured as described above, the monitoring node performs the processing of steps ST11 to ST14 in order to reflect the change of the process data on the CRT as quickly as possible. Need to repeat at high speed. Therefore, the read command is repeatedly transmitted to the control node in a short cycle. On the other hand, a plurality of monitoring nodes tend to be provided for function distribution and load distribution with the increase in the scale of the process. For this reason, the performance of the network connecting the nodes becomes important, but if the monitoring node transmits the read command in a short period as described above, the load on the network becomes enormous.

In particular, even when the process data changes infrequently, the read command must be continuously transmitted in a short cycle in order to quickly reflect the change on the CRT when the process data changes. However, there is a problem that while most of the communication is wasted, the load on the network is surely increased.

Further, in the monitoring node, the capacity of the CPU is wasted on useless communication and CRT control.
Another problem is that other services for the required operator cannot be executed.

As prior art similar to the present invention, Japanese Patent Application Laid-Open No. 1-188198 and Japanese Patent Application Laid-Open No.
No. 840 discloses this.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a process monitoring control system capable of eliminating unnecessary communication processing and improving the throughput of the system.

[0011]

A process monitoring control system according to the present invention includes a control node for controlling a process and a monitoring node for collecting process data from the control node via a communication line. The monitoring node has a communication control unit for transmitting a registration command for designating a process input / output for which process data is to be collected to the control node, and the control node transmits the process input / output (process I / O). ) And a monitoring node that requires process data are registered. When a registration command is received from the monitoring node, a process I / O indicated by the command and a monitoring node that requires process data are registered. There is a change in the management unit registered in the management table and the process data related to the process I / O registered in the management table. The case, and has a state change detection unit transmits the process data to the monitoring nodes requiring the data.

[0012]

According to the present invention, the communication control unit and the management unit
The control node is automatically registered / updated in the management table, and the state change detection unit checks the state change only for the process data related to the process input / output registered in the management table. Only the data is sent to the monitoring node that needs the data.

[0013]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the process monitoring control system. In the figure, 100, 10
1 is a monitoring node, 200 is a control node for controlling the process 21, and 12 is a network cable (communication line) connecting each node.

In the monitoring nodes 100 and 101, 4
Is a CPU, 5 is a memory for storing programs and data,
6 is an interface circuit between the bus of the CPU 4 and the CRT 7 and the keyboard 8, 9 is a hard disk for storing programs, collected data, and the like, 10 is an interface circuit between the bus of the CPU 4 and the hard disk 9,
Reference numeral 11 denotes a communication interface unit for connecting a CPU bus to a network. The monitoring screen control unit is realized by the CPU 4 and the program in the memory 5, and the communication control unit is realized by the CPU 4, the program in the memory 5, and the communication interface unit 11.

In the control node 200, 13
Denotes a CPU, 14 denotes a memory for storing programs and data, 15 denotes a process input / output unit between a bus of the CPU 13 and a process 21 to be controlled, and 16 denotes a management table. The management unit is realized by the CPU 13, the program in the memory 14, and the communication interface unit 11,
The state change detection unit is realized by the CPU 13, the program in the memory 14, and the process input / output unit 15. Also,
The memory 14 and the management table 16 may be realized on one storage medium.

FIG. 2 shows an example of the configuration of the management table 16, and FIG. 3 is a flowchart showing the operation of the process monitoring control system. In the figure, steps ST11 to ST14 show the operation for controlling the monitoring screen in the monitoring node, steps ST21 to ST25 show the operation of the communication control unit in the monitoring node, and steps ST31 to ST25.
ST32 shows the operation of the management unit in the control node, and steps ST33 to ST35 show the operation of the state change detection unit in the control node.

Next, the operation will be described with reference to the flowchart of FIG. In the monitoring node, the monitoring screen control unit generates communication data to collect process data necessary for displaying the monitoring screen (step ST1).
1) Send a communication request to the communication control unit (step ST1)
2).

When receiving the communication request (step ST21), the communication control unit determines whether the request is the first process data or the process data already registered in the control node 200 (step ST21). S
T22). If it is the first request, a command requesting registration of a process I / O number related to the process data is sent to the control node via the communication interface unit 11 and the network cable 12 (step ST2).
3). In the control node, the communication interface unit 1
1 receives the command through the management table 16 and stores the process I / O number and the process I / O number in the management table 16.
The number of the monitoring node to which data on / O is to be sent is registered (steps ST31 and ST32).

As shown in FIG. 2, the management table is a database including a process I / O number, a previous value of the process data, a current value of the process data, a node number to be notified when the status changes, and the like.

The state change detection unit of the control node 200
The process I / O registered in the management table 16 is constantly checked (step ST33). If the current value is different from the previous value, that is, if a state change occurs, a monitoring node that needs to be notified is searched from the management table, and the latest data (current value) is transmitted only to that node (step ST34, 35).

In the example shown in FIG. 2, the process I / OAI 1
Since the data of 00 is 100 both in the present value and the previous value, there is no need to notify the monitoring nodes 100 and 101 of the data. Since the data of the DI 100 has the current value of 1 with respect to the previous value of 0, it is necessary to notify the monitoring node that needs to be notified. Then, it is known from the management table 16 that the data has to be transmitted to the monitoring node 100 and the monitoring node 101. Therefore, the data is transmitted to the monitoring nodes 100 and 1 via the communication interface unit 11 and the network cable 12.
01 is sent.

In the monitoring nodes 100 and 101, the communication control unit that has received the latest data passes the data to the monitoring screen control unit (steps ST24 and ST25). When receiving the process data (step ST13), the monitoring control unit performs CR based on the data as in the conventional case.
The monitoring screen on T is updated (step ST14).

In the above embodiment, the monitoring node 10
A case has been described in which the registration in the management table is automatically performed according to the communication protocol between the monitoring node and the control node when the first registration command is issued from 0 or 101.
The registration in the management table 16 may be registered by a dedicated registration command through manual operation of an operator or the like before the system operation, and in this case, the same effect as in the above-described embodiment can be obtained.

[0024]

As described above, according to the present invention, the process monitoring control system performs a state change check and data transmission only for a control node having a management table and registered in the management table. With the configuration, it is not necessary for the monitoring node to constantly repeat data collection and display update via the communication line, and there is an effect that a load on the communication line can be reduced. In addition, the monitoring node can easily perform other services, and the effect of improving the serviceability for the operator can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a process monitoring control system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating an example of a management table.

FIG. 3 is a flowchart showing an operation of the process monitoring control system according to one embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of a conventional process monitoring control system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 monitoring node 101 monitoring node 200 control node 4 CPU (communication control unit) 11 communication interface unit (communication control unit, management unit) 13 CPU (management unit, state change detection unit) 15 process input / output unit (state change) Detection unit) 16 Management table

Claims (1)

(57) [Claims] A control node for controlling a process;
A monitoring node that collects process data from the control node via a communication line, wherein the monitoring node sends a process input to the control node to be a process data collection target. A communication control unit that transmits a registration command specifying an output, wherein the control node has a management table in which a process input / output and a monitoring node that requires process data are registered; and A management unit that registers a monitoring node that requires the process input / output and process data indicated by the command in the management table;
When there is a change in process data related to the process input / output registered in the management table, a state change detecting unit that transmits the process data to the monitoring node that needs the data is provided. Process monitoring control system.