JPH0635837A - Process input/output control system - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] A certain user program inputs and outputs data to and from each process, processes the data telegram from the higher-level device as is, and outputs it to multiple process data. Realize a process I / O control method that can be accessed and has good diversion and expandability. [Configuration] Between the control device and multiple external processes,
In a data input / output control system of a process control device for inputting / outputting data via each printed board built in the device, access of input / output data to / from each process is performed.
The user program is configured to access using a logical address corresponding to the physical address of each printed board. Further, the access request from the user program has an invalid logical address (NOP address) for which access processing is not actually performed, and is configured to request access to a plurality of input / output data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data input / output control system for a process control device for inputting / outputting data between a control device and an external process (control equipment, sensor, etc.).

For inputting / outputting data to / from each process, it is necessary to collect data and control equipment while controlling input / output according to the type of the data.

[0003]

2. Description of the Related Art In a conventional process control device, printed boards for actually inputting / outputting different types of data for each process are prepared in parallel, and the input / output of data to each printed board is controlled. However, data was input and output with each process. In other words, the physical address (IO address, Process IO
I / O and process of the user program while performing command output and status input required for I / O control of each printed board by using different data depending on the type of LSI and the process type. I did data input and output.

[0004]

Conventionally, as described above,
Since the control depends on the physical address of each printed board, if the number of processes is increased or decreased or the contents are changed when a system is added or expanded, change the physical address of the printed board used for control. There is a problem in that the data type (depending on the printed board) is changed and the user program needs to be changed, resulting in lack of diversion. In addition, when the process control device receives control data from the host device and performs process control while analyzing the received data, or when the process data is edited as collected data and sent to the host device, the process The data must use a format agreed with the host device in advance. Even when sending and receiving data to and from the host device, if the telegram changes due to an increase or decrease in the number of processes or changes in the contents, it is necessary to change the program for the data analysis part and the data edit part, and the scalability is poor. There was also a problem. An object of the present invention is to allow data to be input to and output from each process by a fixed user program without being aware of the physical address or data type used for control, and to transfer the data from the host device. It is to realize a process input / output control method that can process a message as it is and can access multiple process data with good diversion and extensibility.

[0005]

The basic configuration of the present invention for achieving this object is shown in the principle diagram of FIG. In the figure, 1 is a process control device, 2 is a sensor, which serves as an input to the process control device by converting sensed data into a digital value or an analog value, and 3 is an external device from the process control device. A device 4 for controlling on the basis of digital value or analog value data is a printed board, which actually inputs / outputs data to / from the sensor or an external device. 5
Is a logical address / physical address / data type management table newly established in the present invention, and stores correspondence between physical addresses, logical addresses and data types, and input data and output data. A process input / output control unit 6 outputs output request data to an external device via a printed board or data from a sensor while analyzing request parameters from a user program (editing process, analysis process, etc.). Is sent to the user program via the printed board, 7 is a higher-level device, receives collected data from the process control device and sends control data to the process control device, 8 is transmission data, A telegram for transmitting data from the sensor to the device, 9 is an editing process,
The output data of the sensor notified from the process input / output control unit is edited into the transmission data, 10 is the reception data, the telegram of the control data requested to be controlled by the higher-level device, and 11 is the analysis process. It analyzes the received data from the device and requests the process input / output control unit for the data to the external device. FIG. 2 shows a format of request parameters from the user program (editing process, analyzing process, etc.) of the process input / output control unit of the present invention.
Processing is performed in order in the description area of the logical address string in word units and the process data string corresponding to the logical address. FIG. 3 is a request parameter format when an invalid NOP address is provided as a logical address in the present invention.
By describing the NOP address in the logical address sequence of FIG. 2, it is shown that the transmission data and the reception data can be used as they are as request parameters of the process input / output control unit. In other words, a program is not changed by associating a NOP (Not Operative) address that is actually invalid with the requested address area of information required for transmission and reception.

[0006]

According to the present invention, the user program can execute the process from each process by using the logical address capable of accessing the 1-word data corresponding to the physical address by the management table 5 of the logical address / physical address / data type. Input and output the data. In addition, the user program can request a plurality of logical addresses at the same time, and by providing an invalid NOP address, it is possible to use the transmission data and the reception data with the host device as they are. It becomes unnecessary to change the program for changing the physical address, changing the data type, and increasing or decreasing the number of processes.

[0007]

FIG. 4 is a flow chart of a user program according to an embodiment of the present invention. In the generation processing request of step 101, the logical address, the physical address, and the data type are associated with each other, and the logical address is used to request the input processing of data with each process of 102 and the output processing request of 103. FIG. 5 is a flowchart of the generation process.
When asked whether the logical address of 01 is a NOP address,
If NO, the management table of 202 is investigated, and in 203, the presence or absence of the same logical address as the target logical address is asked.
Then, if there is no NO, it is registered in the management table at 204 and the input / output of data to / from the printed board corresponding to the logical address is controlled. Then, in 205, the presence or absence of the next request is inquired. If there is no NO, the process ends, and if YES, the process returns to 201. Note that 201
If it is YES NOP address in the question
Jump to the question No. 203, and even if the question No. 203 has the same logical address of YES, it jumps directly to the question No. 205.

FIG. 6 is a flow chart of the input processing. First, in step 301, a question is asked as to whether the logical address is a NOP address. If the answer is NO, the management table of 302 is checked and the target logical address of 303 is checked. Ask whether or not. If YES is determined, 304 controls the input of data to the printed board corresponding to the logical address. 3 if no
Performs 05 error handling. Then, in 306, the presence or absence of the next request is inquired, and if there is no NO, the process ends, and if YES, the process returns to 301. If the 301 question has a NOP address of YES, the question directly jumps to the 306 question.

FIG. 7 is a flow chart of the output process. First, in step 401, a question is asked as to whether the logical address is a NOP address. If the answer is NO, the management table of 402 is checked, and the target logical address of 403 is checked. Ask whether or not. Then, if YES, 404 controls the output of data from the printed board corresponding to the logical address. 4 if no
Performs 05 error handling. Then, in 406, a question is asked as to whether or not there is a next request. If there is no NO, the process ends, and if YES, the process returns to 401. If the 401 question has a NOP address of YES, the question directly jumps to the 406 question.

[0010]

As described above, according to the present invention, it is possible to flexibly cope with the change of the physical address, the change of the PIO type, and the change of the electronic message of the host device. The effect that can be built is obtained.

[Brief description of drawings]

FIG. 1 is a principle diagram showing a basic configuration of a process input / output control system of the present invention.

FIG. 2 is a format of a request parameter from the user program of the present invention.

FIG. 3 is a format of a request parameter when a NOP address is provided as a logical address of the present invention.

FIG. 4 is a flowchart of a user program according to the embodiment of this invention.

FIG. 5 is a flowchart of generation processing according to the embodiment of this invention.

FIG. 6 is a flowchart of input processing according to the embodiment of this invention.

FIG. 7 is a flowchart of output processing according to the embodiment of this invention.

[Explanation of symbols]

1 is a process control device, 2 is a sensor, 3 is an external device, 4
Is a printed board, 5 is a management table of logical address / physical address / data type, 6 is a process input / output control unit, 7
Is a host device, 8 is transmission data, 9 is edit processing, 10 is reception data, and 11 is analysis processing.

Claims (2)

[Claims] 1. A data input / output control system for a process control device, wherein data is input / output between a control device and a plurality of external processes via respective printed boards built in the device, A process input / output control method characterized in that the user program accesses the input / output data between the access points using the logical address corresponding to the physical address of each printed board. 2. The access request from the user program has an invalid logical address (NOP address) for which access processing is not actually performed, and requests access to a plurality of input / output data. The process input / output control method according to claim 1.