JPS60105007A - Executing system for input and output control - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a large input/output control execution method for enhancing data input/output functions for terminal equipment in a programmable controller that controls manufacturing equipment, etc. .

[Background of the invention]

Originally, the main role of programmable controllers was sequence control of production equipment, but as production systems become more sophisticated, they are also being used to control terminal equipment and communication equipment. The following methods have been used in the past to achieve this functionality.

First, as an example, there is a method in which a single processor executes a control program for terminal equipment, etc. between executions of equipment control programs, but in this method, while the control program for terminal equipment, etc. There was a problem in that the program could not be executed and the response speed to input signals from the equipment was correspondingly slow.

Therefore, as another example, in order to reduce the load on the main processor that executes equipment control programs, an input/output control processor that controls terminal equipment and communication equipment is provided in addition to the main processor, and the main processor inputs and outputs There is a method in which data to be input/output is transferred to a control processor, and the input/output to/from the actual device is performed by the input/output control processor.

However, even with this method, when transferring the complex format specification data necessary for creating daily production reports and ledgers, the processing amount of the main processor becomes enormous, and during this time the equipment control program cannot be executed, and the The problem of slow response speed to input signals remains unsolved.

[Object of the Invention] The object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a programmable controller that can efficiently control terminal equipment, communication equipment, etc. without interfering with the execution of equipment control programs. The objective is to provide an input/output control execution method.

[Summary of the invention]

The input/output control execution method according to the present invention converts a source program into an object program and stores it in a memory, and executes the stored program to control the input/output ports of a programmable controller. In the control execution method, after interpreting input/output statements with format specifications in the source program, the object program indicating the start of input/output execution is stored in the program memory for the main processor, and the object data indicating the format is stored in the input/output program memory. Giving input/output execution commands from the main processor to the input/output control processor via a control register that is stored in the program memory for the output control processor and can be referenced and written to by the main processor and the input/output control processor. In other words, the input/output control 'fl+ processor executes input/output control based on object data indicating a format, which is stored in its own program memory.

Note that this will be supplemented and explained. When converting a north program into an object program and storing it in memory,
The translator that performs this conversion interprets the input/output statements for the terminal equipment, communication equipment, etc. of the input/output port, stores the object data indicating the input/output format in the program memory for the input/output control processor, and starts the input/output. The object program to be instructed is stored in the program memory for the main processor. This allows the main processor to simply issue input/output execution commands to the input/output control processor, and the input/output control processor can perform input/output in the format specified by the program.
The load on the main processor can be significantly reduced.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a programmable controller to which the input/output control execution method according to the present invention is applied.

ζ, iron, 1 is a program console, 2 is a console interface, 3 is a main processor, 4 is a program memory for the main processor 3, 5 is a control register,
51 is its command register, 52 is its output register, 53 is its human power register, 6 is a data memory, 7 is an input/output control processor, 8 is a program memory for the input/output control processor 7, and 9 is a terminal interface.

First, the source program is programming console 1
The console interface 2'fr: The object program for equipment control executed by the main processor 3 via the translator and the object program indicating the start of execution of input/output of terminal equipment and communication equipment are for the main processor. The object data indicating input/output formats of terminals, devices, and communication devices is stored in the data memory 6 of the input/output control processor 7.

Input/output control of terminal equipment and communication equipment is performed as follows. That is, the main processor 3 controls the control register 5.
By issuing an input/output command to the input/output control processor 7, the input/output control processor 7 receives the command from the control register 5, and based on the input/output format data stored in the data memory 6, outputs the input/output command to various terminals via the terminal interface 9. Operate the equipment.

The program for the input/output control processor 7 is stored as a system program in the program memory 8 for the input/output control processor. Further, the control register 5 has a structure that can be referred to by both the main processor 3 and the input/output control processor 7, and includes a command register 51, an output register 52, and an input register 53.

Next, an example of a source program for controlling a terminal device with this programmable controller, an object program for the main processor, and object data for the input/output control processor will be shown.

FIG. 2 is an explanatory diagram of an example of a PRINT statement that outputs data to a terminal device. Here, "NO=" and 'TY
PE=''' means to output each character constant in r""j, and AIR is a real number type to the variable, and it is still B.
:: means to output variable B as an integer type. 5I
)(4) means to leave a blank space equal to four force rams.

FIG. 3 shows a format diagram of an object program for the main processor regarding the source program. The beginning is an operator indicating PRINT processing, and the operands are the head number of this statement, the number of variables to be output, and the address of each variable.

FIG. 4 shows a format diagram of format data for the input/output control processor. The format data consists of a format list and a constant/variable area. The format list shows the data type, output output RAM length, and constant/variable address for each input/output item of the input/output statement.

Figures 3 and 4 are the main processor object program and format data for one statement, respectively.
In total, the same number of input/output statements as shown in FIGS. 3 and 4 are generated.

Next, the procedure for executing input/output control will be explained.

First, FIG. 5 shows a flowchart of output processing to a terminal device.

The main processor 3 first writes a command indicating PR and INT to the command register 51 as a process for the PRINT operator. When this command is written,
An interrupt signal is sent from the command register 51 to the input/output control processor 7. The input/output control processor 7 prepares to receive data sent from the main processor 3 via the output register 52.

Following writing of the PRINT command, the main processor 3 writes the statement number specified as an operand and the value of the variable to be output into the output register 52. Here, since the address of this variable is in the operand, the value of the variable to be output can be easily determined by extracting the contents of that address. The input/output system rrA+ processor 7 continues to output the first shift written in the output register 52 and stores it in a predetermined area.

After transferring the values of all variables, the main processor 3 writes a transfer end command to the command register 51. Upon receiving this command, the input/output control processor 7 starts output processing to the terminal device according to the format data of this sentence.

The main processor 3 can perform output to the terminal device with only the above processing, but when performing processing to check whether the input/output control processor has completed the output processing to the terminal device, the following process shown in FIG. Just add a processing flow.

That is, the main processor first writes a processing status response request command for an input/output statement to the command register, and then writes the number of the statement whose processing status is desired to the output register 52.

When the input/output control processor 7 receives the response request command, it checks the processing status of the input/output statement with the number written in the output register 52, and writes a code indicating that the processing is in progress or processing has been completed to the input register 53. The main processor can learn the desired state by reading the contents of input register 53.

Next, FIG. 7 shows a flowchart of input processing regarding the terminal equipment.

The formats of the source program for the INPUT statement that performs input processing, the object program for the main processor, and the format data for the input/output control processor are as follows:
, 3 and 4, except that the operator of the object program uses input processing input instead of PRINT.
It becomes NPUT.

As the INPUT operator process, the main processor 3 first writes a command indicating the command regimen AINPUT. When this command is written, an interrupt signal is sent from the command register 51 to the input/output control processor 7, and the input/output control processor 7 prepares to receive data sent from the main processor 3 via the output register 52. do.

Following writing of the INPUT command, the main processor 3 writes the Bunkego designated as an operand to the output register 52. After storing the value of this sentence in a predetermined area, the input/output control processor 7 stores the value of this sentence in a predetermined area.
Input processing from the C terminal device starts according to the formula data.

Furthermore, the main processor 3 includes an input/output control processor 7.
Wait for the end of the input process and perform the process of receiving the input value. The time required for input processing by the input/output control processor 7 varies depending on the input, but it often takes several minutes in the case of input from a device operated by a human, such as a keyboard. Since it is not possible for the main processor 3 to stop executing other programs and wait for the input/output control processor to finish processing for such a long period of time, the main processor 3 can perform periodic processing while executing the equipment control program. A processing status response request command for the input/output statement is then written into the command register 51 to check whether the input processing has ended. Then, when the input processing is completed, the input value reading processing is started.

The reading process is performed as follows. That is, the main processor 3 sends a command for reading to the command register 51, and the input/output control processor 7 that receives this command writes an input value to the output register 52, which is then read by the main processor 3. and stores it in the variable area at the address specified by the operand.

The above is an example of input/output control for a terminal device, but input/output can also be performed for a communication device such as a network using a similar method.

As described above, according to this embodiment, input/output processing for terminal equipment and communication equipment can be performed with less burden on the main processor that executes the equipment control program. The degree of reduction in burden compared to the conventional method will be specifically shown in the case of the output processing shown in the embodiment as follows.

In the method of this embodiment, the main processor's processing consists of writing the statement number and variable value.If the statement number is 1 byte and the variable value is 2, which is 8 bytes, it is the writing of a total of 9 bytes of data. Become. On the other hand, in the conventional method in which format data is transferred from the main processor to the input/output control processor, the main processor transfers "NO=" as the format data.
" and "TYPE=" constant 'f: 8 bytes, data type and data length as a list of about 10 bytes, total 1
This will result in an extra 8 bytes being transferred. That is, according to this method, in this example, the processing amount of the main processor can be reduced to about ⅓.

In this way, in this method, the translator generates format data from the source program and stores it for the input/output control processor, so even if the format of the input/output data is quite complex, the equipment control program can be executed. Input/output processing can be performed with a fraction of the processing of conventional methods without increasing the processing of the main processor.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to efficiently control terminal equipment, communication equipment, etc. without interfering with the execution of the equipment control program. Improved functionality and efficiency,
A remarkable effect on economicization can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a programmable controller to which the input/output control execution method according to the present invention is applied, FIG. 2 is an explanatory diagram of an example of a PRINT statement for outputting data to a terminal device, and FIG. FIG. 4 is a diagram showing the formation of an obenect program for the main processor regarding the source program, FIG. 4 is a format diagram of format data for the input/output control processor, and FIG. FIG. 6 is a flowchart of the process for checking the end of the process, and FIG. 7 is a flowchart of the input process regarding the terminal device. DESCRIPTION OF SYMBOLS 1... Program console, 2... Console interface, 3... Main processor, 4... Program memory, 5... Control register, 51... Command register, 52... Output register, 53 ...
Input register, 6... data memory, 7... input/output control processor, 8... program memory, 9...
Terminal interface. Agent Patent attorney Kosaku Fukuda (and 1 other person) 1st 2nd F[NT "NO=", A:g, 5PC4),'TYP
E=”, 5.1 Item 3, Country 4, Figure 5, Entrance 6

Claims (1)

[Claims] 1. Convert the source program to an object program, store it in memory, and run the stored program to create a file related to input/output ports.
In the input/output control execution method of a programmable controller that executes i11'I, after interpreting an input/output statement with a 1 expression specification in the source program, the object program indicating the start of input/output execution is stored in the program memory for the main processor. The object data indicating the format is stored in the program memory for the input/output trill fill processor, and is input/output from the main processor via a control register that can be referenced and written to by the main processor and the input/output control processor. By giving an input/output execution command to the control processor, the input/output processors 114 execute input/output control based on object data indicating a format stored in their own program memory. Human output control execution method.