JPH07113844B2 - Programmable controller programming device - Google Patents

Description

The present invention relates to a programming device of a programmable controller (hereinafter, referred to as a PC) that performs various controls by a stored program. The present invention relates to a programming device having an automatic check function for read / write abnormalities.

(Prior Art) As is well known, a PC developed from the idea of replacing a relay panel has come to be applied to various control fields such as a so-called FA (factory automation) system. For this reason, the programs tend to become more complicated and larger in scale as the PC advances.

Conventionally, a programming device that creates a program for a PC generally creates a program by inputting a diagram such as a ladder diagram in which the program is represented by relay symbols.
Is converted into a command group that can be executed. This instruction word is usually composed of an opcode and an operand. The opcode indicates the type of instruction to perform read processing or write processing, and the operand indicates the memory of the PC to be processed by these instructions. The address of the department is defined.

Here, the storage unit of the PC is roughly divided into an input area for storing an input from the controlled object, an output area for storing an output to the controlled object, and a memory area used in the process of deriving an output from the input.

(Problems to be solved by the invention) In a conventional programming device, a program is created by using a diagram such as a ladder diagram according to an image of a relay circuit diagram. It is easy. However, if the created program does not operate the PC, the program can be recognized as abnormal. However, even if the PC operates, a program that does not perform correct control operation due to a read / write error etc. Check cannot be done.

For this reason, in the past, it was necessary to carefully check the program by obtaining it before the trial run of the PC, and much labor and time was spent on such checking work, and in some cases, the program abnormality could not be detected and was overlooked. There was also a risk of being lost.

The present invention has been proposed to solve the above problems,
The purpose is to improve the efficiency and reliability of PC program creation / testing, which is becoming difficult to perform artificial checking due to complexity and large scale, so automatic checking without human intervention is possible. It is to provide a PC programming device.

(Means for Solving the Problems) In order to achieve the above object, the present invention is, as shown in FIG. 1, a program storage memory 10 for storing a created PC program, and the program storage memory 10 for storing the program. Are sequentially taken out, the address on the storage unit of the PC to be processed by this instruction is extracted, and according to the type of instruction whether the instruction word is a read instruction or a write instruction. And an instruction analysis unit 20 that adds the number of reads and the number of writes to the storage unit of the PC, and a usage status storage memory 30 that stores the number of reads and the number of writes for the address and indicates the usage status of the storage unit of the PC. And this usage storage memory 30
From the contents of the above, there is an input area in which writing processing is being performed in the storage section of the PC, or an output area in which writing processing has not been performed, or there is reading or writing processing only. Illegal use search unit 40 that searches for the existence of a memory area
And a warning output device 50 that warns the retrieval result by the illegal use retrieval unit 40 as a read / write abnormality in the program.

(Operation) According to the present invention, the number of reads and the number of writes with respect to the addresses on the storage unit of the PC are stored in the usage status storage memory 30 for each instruction word that constitutes the program. The illegal use search unit 40 searches the contents of the usage status storage memory 30, detects a read / write error in the program from the number of reads or the number of writes corresponding to the address,
This serves to give a warning via a warning output device.

(Example) An example of the present invention will be described below with reference to the drawings.

First, FIG. 2 is a block diagram showing the configuration of this embodiment. In FIG. 1, reference numeral 1 is a keyboard for performing key input for programming and check processing described later. As shown in FIG. 3, the keyboard 1 is a program creation start key, a creation end key, a storage key, a check key, A symbol key, a numeric keypad, and a cursor movement key are provided and are connected to the diagram information buffer 2. Further, 50 'is the warning output device for displaying a ladder diagram as shown in FIG. 4, for example.
It is a CRT as 50, and this CRT 50 'is also a figure information buffer 2
It is connected to the.

Here, the internal structure of the diagram information buffer 2 is as shown in FIG. 5, and the buffer 2 has a symbol storage unit 2A, a connection storage unit 2B and an operand storage unit 2C corresponding to the cursor position on the CRT 50 '. Has multiple sets. Of these, the symbol storage unit 2A stores and represents the horizontal connections, contacts, coils, etc. of the ladder diagram by numerical symbols. For example, the symbol "0" indicates that the above components are absent, and "1" indicates the horizontal connections. ,
“2” indicates a contact, and “3” indicates a coil.

Also, the connection storage unit 2B defines a vertical connection, and the symbol "0" is set.
Indicates that there is no vertical connection, and "1" indicates that there is vertical connection.
Further, the operand storage unit 2C stores the addresses of the input area, the output area, and the memory area in the storage unit of the PC as operands.

In FIG. 2 again, 3 is a figure information / instruction word conversion section, and this conversion section 3 converts the figure information and the instruction word between the figure information buffer 2 and the program storage memory 10 described later. When the program is created, the contents of the drawing information buffer 2 are converted into command words, and when the created program is corrected or confirmed, the command words are read from the program storage memory 10 and converted into drawing information. This is for storing this in the figure information buffer 2 and displaying it on the CRT 50 '.

The program storage memory 10 stores the created program, and one instruction word that constitutes the program consists of an operation code and an operand. As shown in FIG.
These are the operation code storage unit 10A and the operand storage unit 10B.
Stored in each. In FIG. 6, the operation code “1” indicates a read process (read), “2” indicates a theoretical product (AND), “3” indicates a theoretical sum (OR), and “4” indicates a write process (write). Shown respectively.

Furthermore, an instruction analysis unit 20 is connected to the program storage memory 10. The instruction analysis unit 20 is for analyzing an instruction word by a check signal from the keyboard 1, and transmits a check signal to the illegal use search unit 40 at the end of the analysis.

Further, the instruction analysis unit 20 is connected to a usage status storage memory 30 indicating the usage status of the storage unit of the PC, and the storage memory 30 is
As shown in FIG. 7, an operand storage unit 30A that stores an operand that is an address of the storage unit of the PC, a read number storage unit 30B that stores the number of reads and the number of writes for the address corresponding to each operand, and a write And a number storage unit 30C.

Then, the usage status storage memory 30 and the instruction analysis unit 20
An illegal use search unit 40 is connected to the CRT 50 '.
The search unit 40 receives a check signal indicating the end of analysis from the instruction analysis unit 20 and searches the storage unit of the PC for illegal use based on the number of reads and the number of writes for each operand of the usage status storage memory 30. And the result is CRT5
It is configured to display 0 '.

In addition, in FIG. 2, 4 is a PC interface,
This is for receiving a storage signal sent from the keyboard 1 after creating the program and sending the program in the program storage memory 10 to a PC (not shown).

Next, the operation of this programming device will be described.

First, when creating a program, after operating the program creation start key of the keyboard 1, draw a relay circuit diagram on the screen of the CRT 50 ', and in that case, by operating the cursor movement key of the keyboard 1, Move the cursor vertically and horizontally on the screen to select the desired input position.

Next, for example, when a contact key is input, the symbol "2" is stored in the symbol storage unit 2A at the corresponding cursor position in the drawing information buffer 2, and at the same time, the contact figure is displayed on the CRT 50 '. When the coil key is input, the symbol storage unit 2A at the corresponding cursor position in the drawing information buffer 2
The symbol "3" is stored in the
Displayed on CRT50 '.

In addition, when the horizontal connection key is input, the corresponding symbol storage section
The symbol "1" is stored and displayed in 2A, and the symbol "1" is stored and displayed in the connection storage unit 2B when the vertical connection key is input. Then, when a numeral key is input, the numeral is stored in the operand storage unit 2C at the corresponding cursor position and simultaneously displayed on the CRT 50 '.

In this way, the ladder diagram is created on the screen of the CRT 50 ', and the model of this ladder diagram is stored in the diagram information buffer 2. 4 and 5 correspond to the above input operation.
The contents of the screen of the CRT 50 'and the drawing information buffer 2 are shown.

When the program creation end key of the keyboard 1 is input at the end of program creation, a conversion signal is sent to the diagram information / command word conversion unit 3 shown in FIG. The contents of the buffer 2 are converted into command words and stored in the program storage memory 10. In this case, as shown in FIG. 6, each of the symbols has an opcode "1".
(Reading process), "3" (logical sum or parallel connection), "2" (logical product or series connection), "4" (writing process), and operands "001" and "002" for each opcode. , “102”, and “201” are stored.

Next, the operation of checking the created program will be described in detail with reference to the flowchart showing the process of the instruction analysis unit 20 in FIG. 8 and the flowchart showing the process of the illegal use search unit 40 in FIG. explain.

First, the instruction analysis unit 20 initializes the usage status storage memory 30 (step S1 in FIG. 8). Here, “initialize” means to set the usage status storage memory 30 in a state in which no data is registered.

Next, the instruction fetch pointer is set to the program storage memory 10
Is set to the head of the instruction (step S2), and one instruction word is fetched from the instruction fetch pointer position via step S3 (step S4), and an operand is extracted from the fetched instruction word (step S3).
S5). Then, this operand is used as the usage status storage memory 30
Is searched from the operand storage unit 30A (step S6).

Here, if there is no corresponding operand in the usage status storage memory 30 (at the beginning of the analysis, by the initialization in step S1 above,
The first operand is not always stored), this operand is used as the operand storage unit 30A of the usage storage memory 30.
(The same S7), and the respective numbers of the read number storage section 30B and the write number storage section 30C are set to zero, and this registration position (hereinafter,
The operand position) is stored (at step S81). When the operand is already registered in the usage status storage memory 30 in the analysis of the instruction word after the second time,
This operand position is stored (at step S82).

Next, the operation code is extracted from the instruction word fetched in step S4 (at step S9), and it is determined from this operation code whether or not the instruction word is a writing process (at step S10). Here, the operation codes “1”, “2”, and “3” are read processing, and “4” is write processing. When the operation code is a read process, the read number is incremented (+1) to the read number storage unit 30B at the operand position stored in step S81 or S82 (S11
1) If the operation code is a writing process, the writing number is incremented in the writing number storage section 30C (at step S112).

Then, the instruction fetch pointer is incremented (
S12), the above process is repeated for all the instruction words stored in the program storage memory 10 (at step S3).

When the above analysis processing is completed, the instruction analysis unit 20 sends a check signal to the illegal use search unit 40, and the illegal use search unit 40 searches for illegal use of the storage unit of the PC. Start.

That is, as shown in FIG. 9, first, the pointer is set at the head of the usage status storage memory 30 (step ST1), and the same S
While taking out the operand at the pointer position via T2,
It is determined whether the fetched operand is the address of the input area of the storage unit of the PC, the address of the output area, or the address of the memory area (at ST3 and ST4). Depending on the specifications of the PC, this judgment criterion is, for example, operands "0" to "99" in the input area, "100" to "199" in the memory area, and "200" to "299".
Is the output area.

Here, the input area is an area for storing data externally input to the controller such as a contact, and the output area is an area for storing data output from the controller such as a coil to the outside. The program creates output data from the data in the input area and writes it in the output area.

From this, it is judged that it is abnormal that the writing process is performed on the input area by the program, and the output area is rarely read by the program. Even if it does not occur once, it will not be judged as abnormal.

If the fetched operand is the address of the input area, the number of writes at the pointer position is fetched, and if the number of writes is not zero, this operand and the message "Write to input" are displayed on the CRT 50 '(ST51, ST61).
That is, "the writing process is being performed in the input area" is displayed. After this display and when the number of writes is zero, the pointer is incremented (ST9 of the same) and the process returns to the determination of step ST2.

Further, when the fetched operand is the address of the output area, the number of writes at the pointer position is fetched, and when this is zero, this operand and the message "output is read only" are displayed on the CRT 50 '(at ST52, ST62). . In other words, "the reading process is performed on the output area where the writing process is not performed" is displayed. After this display and when the number of writes is not zero, the process proceeds to step ST9.

Next, if the fetched operand is neither the input area nor the output area, but is the address of the memory area, the number of readings at the pointer position is fetched, and if this is zero, this operand and the message "Memory is write only" are sent to CRT50. Displayed in ′ (ST53, ST63). That is,
“There is a memory area where writing processing is performed but reading processing is not performed” is displayed. If the read number is not zero, the process proceeds to step ST7.

Subsequently, the number of writings at the pointer position is taken out, and when it is zero, the operand and the message "Memory is read only" are displayed on the CRT 50 '(at ST7 and ST8). In other words, "the reading process is being performed on the memory area where the writing process is not performed" is displayed. If the number of writes is not zero, the process proceeds to step ST9.

The above-described processing is performed for all the operands stored in the usage status storage memory 30, and the search is completed when the operation is completed (ST2 of the same).

As described above, according to this embodiment, when the writing process is performed in the storage area of the PC to store the input from the controlled object, the output area to store the output to the controlled object. If the read process is performed even though the write process has not been performed on the memory, the read process is further performed on the memory area in the storage unit of the PC where the write process is not performed. If
If there is a memory area that is being written but not read, a warning such as "CRT50 '" will be displayed to automatically check and display the program read / write error. It is possible.

In the above embodiment, the case where the check result is displayed and output on the CRT 50 'has been described, but the warning output device may be a printing device such as a printer. It is also possible to store not only the number of readings and the number of writings but also the address of the program being read or written in the specification status storage memory 30 and display this address together with a warning message.

(Effect of the invention) As described above, according to the present invention, the created program is analyzed by the instruction analysis unit, the usage status of the storage unit of the PC is stored in the memory, and the content is searched by the illegal use search unit. Since it automatically checks for read / write or more and then issues a warning by the warning output device, it can greatly simplify the PC program check work, which conventionally required a lot of labor and time. Further, since it is possible to eliminate an artificial check error, it is possible to contribute to improving the reliability of the program.

[Brief description of drawings]

1 is a block diagram showing the configuration of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is an explanatory diagram of a keyboard, FIG. 4 is an explanatory diagram of a display example of a CRT, and FIG. FIG. 5 is an explanatory diagram of a diagram information buffer, FIG. 6 is an explanatory diagram of a program storage memory, FIG. 7 is an explanatory diagram of a usage status storage memory, FIG. 8 is a flowchart showing processing of an instruction analysis unit, and FIG. It is a flow chart which shows processing of an illegal use search part. 10 …… Program storage memory 20 …… Instruction analysis unit, 30 …… Usage status storage memory 40 …… Illegal use search unit, 50 …… Warning output device 1 …… Keyboard, 2 …… Figure information buffer 3 …… Figure information / Command conversion unit 4 …… PC interface, 50 ′ …… CRT

Continuation of the front page (72) Inventor Naoki Yui, 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. (56) References JP-A-57-143608 (JP, A) JP-A-63- 201736 (JP, A)

Claims (1)

[Claims] 1. A program storage memory for storing a created program of a programmable controller, and an instruction word constituting the program is sequentially taken out from the program storage memory, and a storage unit of the programmable controller to be processed by the instruction. An instruction analysis unit that extracts the upper address and adds the number of reads and the number of writes to the storage unit of the programmable controller according to the type of instruction whether the instruction word is a read instruction or a write instruction; A usage status storage memory that stores the number of reads and the number of writes for an address and indicates the usage status of the storage unit of the programmable controller, and write processing to the storage unit of the programmable controller from the contents of the usage status storage memory. There is an input area that exists, or an output area that is only read processing but not writing processing, or there is a memory area that is only read or writing processing. And a warning output device that warns the search result by the illegal use search unit as a read / write abnormality in the program.