JPS6145267B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an apparatus that has a part that generates instructions and a target that receives the commands, such as an electronic computer. The present invention relates to an instruction information retrieval device used for extracting.

In the control device shown in FIG. 1, a central processing unit 10 sequentially reads programs into a program memory 11 and executes control according to the instructions. When it becomes necessary to know the contents of an instruction, the location (address) where each instruction is stored is set in the setting device 12 using a maintenance device (for example, the maintenance panel 5). The device 10 retrieves the instruction corresponding to the set address and displays it on the display 13. When reading out further instructions, the same procedure is repeated. These instructions can be read automatically without having to set the address each time.

An instruction in a program consists of an operation that specifies an operation, and an operand that specifies the target of the operation. Therefore, with the conventional retrieval device shown in FIG. 1, it is possible to determine the motion according to the order of commands, but it is difficult to determine what kind of motion command is given to a specific motion target. In order to know the operands of all addresses, it is necessary to search for operands one after another, which has the drawback of being extremely inefficient. Further, there is often a request to issue an operation command directed to a specific target. With conventional equipment, it was possible to meet the above requirements by processing and analyzing the entire program on a separate computer, but this operation was inconvenient and had the disadvantage of requiring a large-scale system. Ta.

This invention was made in order to eliminate the above-mentioned drawbacks, and by specifying a specific operation target, it is possible to know the content of the instruction given to this target and its address. The object of the present invention is to provide a search device that improves the operability and maintainability of the control device as a whole by improving search efficiency.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, reference numeral 10 is a central processing unit;
indicates program memory. Additionally, there is a search unit 14 for searching the operand part of the program stored in the program memory 11, and an operand setting unit 1 for specifying the operand part to be searched.
5 is provided, and the search results are displayed on the display 13. A specific configuration of the operand search device 14 is shown in FIG.

The value of the operand section set by the operand setting section 15 is stored in the operand setting value storage section 24 at any time. When the control unit 21 outputs the first value of the program address, that is, "0", to the address buffer 22, the central processing unit 10 reads this value, extracts the corresponding content from the program memory 11, and provides it to the search device 14. . The search device 14 immediately imports the contents given from the central processing unit 10 into the command input buffer 23 and stores it in the operand section storage section 25.
The operand part stored in the operand part storage part 25 is compared with the operand part already stored in the operand setting value storage part 24 by the comparator 26. As a result of this comparison, if the two do not match, the comparator 26 does not output an output, and the control unit 21 resets the address next to the currently set address in the address buffer 22, and The operand part of the instruction is compared with the set operand part. This operation is repeated until an instruction operand portion that matches the set operand portion is detected.

As a result of this operation, when a match between the operand part of the instruction read from the program memory 11 and the set operand part is detected, the comparator 26 generates a match signal, and in response to this match signal, the control section 21 gives a signal to the display buffer 27, and the display 1
3 to display the command information.

Although the above explanation has been made regarding a programmable control device such as an electronic computer, the present invention can be similarly applied to other control devices that have a part that issues commands and a part that is the target of commands. Needless to say.

As described above, according to the search device of the present invention, it is possible to easily search for the contents of commands for a specific controlled object, resulting in a significant improvement in the operability and ease of maintenance of the control device. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional search device, FIG. 2 is a block diagram showing the configuration of a search device according to an embodiment of the present invention, and FIG. 3 is a block diagram of a search device used in the search device shown in FIG. FIG. 2 is a block diagram showing a specific configuration. 10...Central processing unit, 11...Program memory, 13...Display device, 14...Search device, 15
...Operand setting section, 21...Control section, 22...
...address buffer, 23...command input buffer, 24...operand setting value storage section, 25...
Operand section storage section, 26... Comparator, 27...
Display buttuhua.

Claims (1)

[Claims] 1. Operand setting values obtained by externally setting data corresponding to the operand part of instruction information regarding a specific control target from among a large amount of instruction information stored in the program memory and the program memory. a comparator that outputs a match signal when a match is obtained by comparing the operand part of the retrieved instruction information; and stepping the address for reading the program memory until a match signal from the comparator is given. An instruction information retrieval device for a control device, comprising: a control section that controls the instruction information of the operand section to be displayed on a display when the coincidence signal is given.