JP3541383B2 - I / O device and process control system having I / O device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an input / output device that distributes input / output data passing through an input / output module to control logic that handles the data, and a process control system having the input / output device.
[0002]
[Prior art]
Process control systems that use control logic by software PLCs (Programmable Logic Controllers) whose functions are defined by software as an execution engine for control applications respond to the demand for open systems by using a programming language (hereinafter referred to as the IEC61131-3 standard). IEC). Soft PLC is a software model.
[0003]
When a process control system is realized by an IEC-compliant soft PLC, data exchange between input / output data and control logic is performed by defining an external variable for input / output in the control logic and declaring the input / output in the external variable. It is common to specify the hardware mounting location.
[0004]
[Problems to be solved by the invention]
As described above, since the input / output hardware implementation information is stored in the control logic itself, if the input / output implementation change (for example, a certain input point is moved to another point due to wiring or other physical factors), the control is required. The logic (program) needs to be changed.
[0005]
Since specific input / output mounting information is embedded in the control logic, it is impossible to flexibly respond to input / output mounting changes without versatility and reusability of the control logic.
[0006]
According to the present invention, a label name is defined for each input / output point, and by accessing this label from the control logic, the hardware implementation information of the input / output is stored outside the control logic. An input / output device with improved usability and a process control system having the input / output device are realized.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the features of the first aspect of the present invention are as follows.
In an input / output device that distributes input / output data passing through an input / output module to a control logic that handles the data,
Label definition means for defining a variable handled by the control logic by a label name,
An input / output module that is provided by the number of input / output points and inputs / outputs input / output data;
A correspondence table in which the correspondence between the mounting position specifying the input / output module and the label name is described ,
And connecting the data input / output from the input / output module to the control logic corresponding to the correspondence table.
[0008]
The feature of the invention described in claim 2 is that
The control logic is configured by a software PLC whose functions are defined by software, and this software PLC is described in a program language conforming to the IEC61131-3 standard.
[0009]
The features of the invention described in claim 3 are as follows:
A control logic creating device having control logic creating means for creating control logic used in the control application and label defining means for defining variables handled by the control logic by label names,
The control application execution means and the label definition means are generated by downloading the data of the control logic creation means and are generated by downloading the data of the label definition means, and the correspondence between the mounting position for specifying the input / output module and the label name is described. A control device having a correspondence table,
A table maintenance device for arbitrarily setting the correspondence between the label name and the mounting position in the correspondence table,
A process input / output device comprising input module means and input / output module means for inputting / outputting data,
And connecting the data input / output from the process input / output device to the control logic corresponding to the correspondence table.
[0010]
The feature of the invention described in claim 4 is that
The control logic creation device, the control device, the table maintenance device, and the input / output device are described in a program language conforming to the IEC61131-3 standard.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram illustrating the basic concept of the present invention. 1 is a control logic creation device, 2 is a control device, 3 is a table maintenance device, and 4 is a process input / output device.
[0012]
The control logic creation device 1 is a device that creates a control application that operates on the control device 2, and is generally realized by a general-purpose computer having a disk device.
[0013]
In the control logic creation device 1, reference numeral 11 denotes control logic creation means for creating control logic by software PLC, and reference numeral 12 denotes label definition means for defining variables handled by the control logic by label names. Downloaded to The control logic is used in the control application.
[0014]
The control device 2 is a device that communicates with sensors and operation units of an actual process to execute process control, and generally operates on a dedicated computer.
Reference numeral 21 denotes a control application execution unit constructed using data downloaded from the control logic generation unit 11 and using a soft PLC as an execution engine.
[0015]
Further, in the control device 2, reference numeral 22 denotes a correspondence table constructed based on the data downloaded from the label definition means 12, and according to the description of this table, the correspondence between the label name and the mounting position of the input / output data of the real process is unified. Is determined.
[0016]
The process input / output device 4 includes a sensor 5 of a real process, a plurality of input module units 4a for inputting / outputting data of the operation unit 6, and a plurality of output module units 4b.
Each of these module means corresponds to a specific label name according to the definition of the correspondence table 22, and the control application execution means 21 exchanges data with the real process via the input / output module means of the designated label name. Executing the control.
[0017]
The table maintenance device 3 accesses the label-mounting position correspondence table 22 that defines the correspondence between the label name and the mounting position through an interface with the operator, and arbitrarily sets the correspondence between the label name and the mounting position.
[0018]
Next, an application example of the device of the present invention will be described more specifically with reference to FIG. An area (A) separated by a dotted line is a generation system of the soft PLC, and corresponds to the control logic generation device 1 of FIG. The area (B) is an execution system and corresponds to the control device 2 and the process input / output device 4 in FIG. The area (C) is a setting system and corresponds to the device table maintenance device 3 in FIG.
[0019]
In the control logic creating apparatus 1, reference numeral 11 denotes a control logic (TaskA) described by a soft PLC, which defines a POU (Program Organization Unit) of a logic body, an input label name IN01, an output label name OUT01, and executes an execution system (B). ) Is downloaded as the soft PLC execution engine 21 of the control device 2.
[0020]
In the control device 2, 23 and 24 are buffer memory areas for data given to the input label name IN01 and the output label name OUT01, and the IO image names% ID0000 and% QD0000 correspond to the input label name IN01 and the output label name OUT01. Indicates a data buffer area.
[0021]
In the control logic generation device 1 of the generation system, reference numeral 12a denotes a label definition table, and reference numeral 12b denotes a program for defining global variables based on the table information. The program is downloaded to the label-mounting position correspondence table 22 of the control device 2.
Further, reference numeral 13 denotes a program that defines the IO images of the buffer memory areas 23 and 24 in the control device 2 and is downloaded to the control device 2.
[0022]
In the table maintenance device 3 in the setting system, actual process input / output data connected to the input label name IN01 and the output label name OUT01 is defined, and this data is stored in the label-mounting position correspondence table 22 and the process input / output device 4. It is downloaded to the input data module group 4a and the output data module group 4b.
[0023]
Since these module groups 4a and 4b are uniquely defined 1: 1 with the mounting position for each label name, the control application execution means communicates with arbitrary input / output data by designating the label name, and Control can be performed.
【The invention's effect】
As is apparent from the above description, according to the present invention, a label name is made to correspond to each input / output point, and by accessing this label from the control logic, the hardware implementation information of the input / output can be read out of the control logic. Can be held.
Therefore, when it is desired to change the mounting position of the input / output data, the label name may be changed, and the control logic (program) need not be changed.
[0024]
Since specific input / output mounting information is not embedded in the control logic, the versatility and reusability of the control logic are improved, and it is possible to flexibly respond to input / output mounting changes.
[0025]
[Brief description of the drawings]
FIG. 1 is a functional block diagram illustrating a basic concept of the present invention.
FIG. 2 is a functional block diagram when the present invention is applied to a specific process control system.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 control logic creating device 11 control logic creating means 12 label defining means 2 control device 21 control application executing means 22 label-mounting position correspondence table 3 table maintenance device 4 process input / output device 4 a input module 4 b output module 5 sensor 6 operation unit

Claims (4)

In an input / output device that distributes input / output data passing through an input / output module to a control logic that handles the data,
Label definition means for defining a variable handled by the control logic by a label name,
An input / output module that is provided by the number of input / output points and inputs / outputs input / output data;
A correspondence table in which the correspondence between the mounting position specifying the input / output module and the label name is described ,
An input / output device for connecting data input / output from the input / output module to a control logic corresponding to the correspondence table. 2. The input / output device according to claim 1, wherein the control logic is constructed by a software PLC whose function is defined by software, and the software PLC is described in a program language compliant with the IEC61131-3 standard. . A control logic creating device having control logic creating means for creating control logic used in the control application and label defining means for defining variables handled by the control logic by label names,
The control application execution means and the label definition means are generated by downloading the data of the control logic creation means and are generated by downloading the data of the label definition means, and the correspondence between the mounting position for specifying the input / output module and the label name is described. A control device having a correspondence table,
A table maintenance device for arbitrarily setting the correspondence between the label name and the mounting position in the correspondence table,
A process input / output device comprising input module means and input / output module means for inputting / outputting data,
A process control system having an input / output device, wherein data input / output from the process input / output device is connected to control logic corresponding to the correspondence table. The process control system having an input / output device according to claim 3, wherein the control logic creation device, the control device, the table maintenance device, and the input / output device are described in a program language compliant with the IEC61131-3 standard.

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