JPH11249711A - Control device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To save labor such as wasting man-hours when constructing a control system, and to improve the efficiency of system construction. In a control device for controlling a process,
A core extracted as a common part from a control application installed in a plurality of facilities, wherein the core includes at least one or more control modules divided for each function constituting the core, and the control module In
At least one or more functional blocks constituting each control module are set as a hierarchical table of contents, and the entire control application has a hierarchical structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for controlling a process, and more particularly to a control device for installing a facility having a similar configuration in a plurality of places so that one control application can be easily applied to another facility. It is improved so that it can be applied to.

[0002]

2. Description of the Related Art As a control application to be installed in equipment in a general process, for example, "Basic and application of an instrumentation system" (Co-edited by Chiba Shiba and Futaba Hanabuchi Ohmsha, published on September 30, 1987) Chapter 10 Details of instrumentation in the manufacturing industry (application I), pages 543 to 692, etc.

In order to efficiently control a process as described in the above-mentioned literature, various types of sensors S1, S2 and S3 are provided inside and around the process as shown in an example of a control device in FIG. , S17 (thermometer, pressure gauge, flow meter, etc.) are installed, and control systems C1, C2,..., C9 (combustion control, pressure control, flow rate control, etc.) using these sensor output values are provided. They are assembled and constructed as control software programs, and all of these control systems are combined to construct a control application in one facility.

[0004]

Conventionally, when constructing a control application as described above, an order for the control application for one facility is received, and then all control systems to be installed in the facility are extracted. Then, by building corresponding control software programs one by one, one control application was put together to complete the entire control device.

However, in such a conventional system, for example, several years have passed since the construction of one control application, and a facility having a configuration almost similar to this facility was newly added to another place. In the case of constructing, or in the case of constructing a plurality of facilities having almost the same configuration in different places such as point A and point B at the same time, a hardware group such as a sensor group for control or a computer system Although the configuration is completely the same, even though some software programs of the control application can be copied, the respective control software programs related to this difference can be entirely changed due to slight differences in equipment specifications. Must be extracted from existing programs and the corresponding parts must be corrected. Work has occurred, it had led to an increase in man-hours.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to save labor such as saving man-hours when constructing a control device, and to improve the efficiency of system construction. And

[0007]

The present invention which has solved the above-mentioned problems is as follows. (1) In a control device for controlling a process, a core extracted as a common part from a control application installed in a plurality of facilities has at least one core divided for each function constituting the core. At least one or more functional blocks constituting each of the control modules are set as a hierarchical table of contents, and the entire control application has a hierarchical structure. Control device. (2) The control device according to (1), wherein the functional block includes at least one or more control loops. (3) The control device according to claim 1, wherein the functional block is described by control drawing programming. (4) The control device according to claim 1, wherein the equipment is a furnace. (5) The control device according to claim 1, wherein the control module is any one of a furnace pressure control module, a ventilation control module, a combustion control module, and a furnace replacement module.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, when constructing a plurality of facilities having a similar configuration, a common part is extracted as a core from a control application, and the core is formed into a hierarchical structure so as to be created once. It is characterized in that various types of control software programs can be reused.

Hereinafter, a control device according to the present invention will be described with reference to the drawings. FIG. 1 illustrates the concept of the present invention. In the example of this figure, a plurality of equipment F1, F2, F
3, F4 is assumed to be installed at substantially the same time. First, each of the control applications of the facilities F1, F2, F3, and F4 has a common part, and the common part is extracted as the core A.
The core A includes at least one or more control modules M1, M2,
It is divided into M3 and M4. In the example of this figure, the number of control modules is four, but the number differs depending on the type of equipment, control application, and the like. Further, each control module M1, M2, M3, M4 is actually an aggregate of a plurality of control loops, and the hierarchical table of contents D is set so as to grasp this aggregate. That is, in the hierarchical table of contents D, the functional blocks d1, d2, d3, d4, d5
... is set. The function block is a group of control loops of the minimum unit such as actual temperature control, pressure control, flow rate control, and the like.

Here, assuming that the equipments F1, F2, F3 and F4 are equipments of a furnace such as a heating furnace, a blast furnace, etc., the control modules M1, M2, M3 and M4 generally have a gas pressure in the furnace. A furnace pressure control module for controlling the temperature, a blower control module for blowing hot air for burning coke, a combustion control module for controlling the combustion temperature in the furnace, a furnace replacement module for replacing a blast furnace, and the like. In this case, the core A includes these control modules M1, M2, M
3, M4.

Next, an example in which the control module M3 is a combustion control module will be described. The hierarchy table D of the combustion control module M3 is as shown in FIG. 2, and is further hierarchically divided into functional modules d1, d2, d3,..., D11. That is, in this example, a combustion system control function block d1 is provided below the combustion control module M3, and a combustion mode function block d2, a furnace temperature control function block d3, and a combustion control function block d4 are provided below that. On the lower side of the combustion control function block d4, an air-fuel ratio control function block d5, an exhaust gas O2 control function block d6, an exhaust gas CO control function block d7, a cross limit function block d8, a control valve opening degree change function block d9, and a combustion air flow rate correction The control block is divided into control loops such as a function block d10 and a fuel flow rate correction function block d11 which can be independently constructed.

FIG. 3 shows an example of how the control loop in the combustion control function block d4 shown in FIG. 2 is actually interfaced. Thus, the air-fuel ratio control (d5), the exhaust gas O2 control (d6), the exhaust gas CO control (d7), the cross limit circuit (d8), the combustion air flow rate (d10), the fuel flow rate (d11), etc. The functions constituting the block d4 are described and interfaced by control drawing programming.

FIG. 4 shows details of the air-fuel ratio control (d5), which is an individual function in FIG. As shown in FIG. 4, the air-fuel ratio control (d5) and other control function blocks (input INP
CRT editing screen and cross limit control as UT (d
8) and exhaust gas O2 control (d6), and as output OUTPUT, exhaust gas O2 control (d6) and cross limit control (d
The interface between 8) and the control valve) is clear, and it is possible to easily understand how the adjustment of the air-fuel ratio control (d5) affects other control functions.
The air-fuel ratio control is for performing stable control while keeping the flow ratio of fuel and air constant. The air-fuel ratio is calculated by a relational expression between a fuel set value and a combustion air flow value. This is control for performing flow rate control and the like. This hierarchical portion is the lowermost portion of the hierarchical structure in the present invention.

FIG. 5 is an actual example when the above example is edited on a CRT screen by control drawing programming using, for example, a control computer system. In addition to the above function blocks, various control loops are shown. Are added, and the details in each functional block and the interface status of each functional block can be determined at a glance.

The other control module M shown in FIG.
1, M2, and M4 are also configured in the same hierarchical structure as the combustion control module M3 described above.

As described above, each control module M
The core A is configured by 1, M2, M3, and M4, and one model of the control application is completed. This core A
Even if a new facility is constructed by applying it to other similarly configured facilities on the basis of the above, if the hardware has the same configuration, the core A can be diverted, and the majority of software engineering can be performed. Can be saved.

If there is a difference in hardware such as the number of sensors installed in actual equipment, it is only necessary to change the programming of the corresponding hierarchy as necessary. When a control loop or the like peculiar to the facility is set in addition to the core A, it is easy to construct the entire control application by separately creating the control loop and adding the control loop to the core A.

In order to realize such a hierarchical structure, even if the names of hardware elements installed in actual facilities are different, if the logic of the control application is not consistent, However, if the control drawing program as described above is used, it is possible to separate the physical layer related to terminal assignment from the software as the logical layer, and to reuse the software program without depending on the terminal information. Can be.

As described above, with respect to the software program in the control device, since the functional blocks in each layer can be handled as software components, the work of modifying and changing these components is greatly simplified, and the generalization of the software program is realized. Reuse can be realized.

[0020]

As described above, according to the present invention, since a control application for controlling a process has a hierarchical structure centering on cores, the same system can be constructed by reusing cores. Becomes easier, and
It is only necessary to modify the functional blocks that correspond to small-scale changes in the application, so that generalization and reuse of the software can be realized, and further, the productivity of the software can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a plurality of similarly configured facilities.

FIG. 2 is a diagram illustrating a table of contents set in a control module.

FIG. 3 is a diagram illustrating an interface of a control loop group.

FIG. 4 is a diagram illustrating an interface of a lowermost functional block of a hierarchical structure.

FIG. 5 is a diagram illustrating an entire configuration when control drawing is used.

FIG. 6 is a diagram of a control device in general equipment.

[Explanation of symbols]

 M1, M2, M3, M4 Module A Core F1, F2, F3, F4 Equipment D Hierarchical Table d1, d2,..., D11 Function Blocks S1, S2,. C9 control system

Claims (5)

[Claims] In a control device for controlling a process, a core extracted as a common part from a control application installed in a plurality of facilities is provided, and the core is divided for each function constituting the core. The control module includes at least one or more control modules. At least one or more functional blocks configuring each of the control modules are set as a hierarchical table of contents, and the entire control application has a hierarchical structure. Characteristic control device. 2. The function block according to claim 1, wherein the function block includes at least one or more control loops.
The control device as described. 3. The function block includes a control drawing
2. The method according to claim 1, wherein the description is made by programming.
The control device as described. 4. The control device according to claim 1, wherein said equipment is a furnace. 5. The control device according to claim 1, wherein said control module is any one of a furnace pressure control module, a ventilation control module, a combustion control module, and a furnace replacement module.