JPS63201736A - Programming device for programmable controller - Google Patents

Abstract

PURPOSE:To simplify a debug work by providing a first - a fourth deciding means and a display means displaying a result of their decision, and finding out an error in case of using a parameter of each instruction word in a control program. CONSTITUTION:The titled device is provided with the first deciding means deciding whether an area number of a storage area which stores an external input data is used as an input parameter of an instruction word in the program or not, and the second deciding means deciding whether an area number of a storage area which stores an external output data is used as an output parameter of the instruction word in the program or not. Moreover, this device is provided with the third deciding means deciding whether an area number of a storage area which stores an internal output data is used as an output parameter and an input parameter of the instruction word in the program or not, the fourth deciding means deciding whether an area number of other storage area is not used as an input parameter nor an output parameter of the instruction word in the program or not, and a display means displaying the result of decision of these deciding means. In such a way, a debug time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a programming device for a programmable controller.

(Prior Art) Programmable controllers are used to automatically control plants and other various equipment. This is a device that recognizes the operating state of a device from various sensors built into the device, and transmits appropriate operating instructions to each part of the device according to the state.

This programmable controller processes input data from sensors and the like, performs calculations, and obtains constant output data according to a control program stored in a memory section.

What is the control program to operate these programmable controllers?

Command words such as AND, OR, and comparison output.

It is configured as a set of input parameters and output parameters representing the data targeted by the command. For these input parameters and output parameters, a storage area for storing input/output data, etc. in the programmable controller is used, which is defined using an appropriate serial number.

Specifically, this number includes a register number attached to the memory to temporarily hold numerical data such as input data, output data, or calculation results, and a register number used to turn on and off the controlled device. A device number assigned to the memory is used to store the 0N10FF control signal.

For example, the instruction set ANDI, 2.3 adds the first input data stored in the memory address of register number 1 and the second input data stored in the memory address of register number 2, and the result is The contents are to store in the memory address of register number 3. In this case, 1,
2 is an input parameter, and 3 is an output parameter. A control program is configured by combining a plurality of such instructions and input/output parameters. Now, a dedicated programming device is used to create such a control program. The operator uses the symbolic display keys and numeric keys provided on this device to input command words and parameters specific to the programmable controller in order, and creates a program while checking the input contents on a display such as a CRT screen. We will proceed with this.

When creating such a control program, so-called debugging is required to remove various logical errors that exist in the control program.

(Problems to be Solved by the Invention) However, program errors include not only errors in the control content itself, but also errors such as incorrect specification of device numbers and register numbers used in the instruction set.

For example, the above-described instruction set ANDI, 2.3 may be incorrectly written as AND3, 2.1 or ANDI, 3.2. An example of this is a case where a register number that should be used as an input parameter is used as an output parameter, or vice versa, a register number that should be used as an output parameter is used as an input parameter.

It is necessary to find and correct such errors before debugging, but errors in the use of device numbers and register numbers are relatively difficult to discover. Also,
To correct this, it is necessary to determine the correct device number and register number while examining the relationship with device numbers and register numbers used in other instructions. Otherwise, device numbers used in other processes will be used redundantly, resulting in new program errors.

SUMMARY OF THE INVENTION An object of the present invention is to provide a programming device for a programmable controller that can easily detect errors in the use of device numbers and register numbers in a control program.

In the present invention, the device number or register number will be collectively referred to as the area number of the storage area in the following description.

[Structure of the Invention] (Means for Solving the Problems) The programming device of the present invention provides a control program that executes an instruction step consisting of an instruction word, input parameters specifying data for executing the instruction, and output parameters. In a device for diagnosing a control program of a programmable controller operating in a programmable controller, a first step is to determine whether an area number of a storage area storing external input data is used as an input parameter of a command word in the program. a second determining means for determining whether the area number of the storage area storing external output data is used as an output parameter of a command word in the program; A third determining means for determining whether an area number is used as an output parameter and an input parameter of an instruction word in a program, and an area number of another storage area is used as an output parameter as an input parameter of an instruction word in a program. 4th to determine whether it is not used as
The present invention is characterized in that it is provided with determining means and display means for displaying the determination results of these determining means.

(Operation) As a result, errors in the usage of parameters of each instruction word in the control program can be discovered, and as a result, debugging work can be easily performed.

(Embodiment) FIG. 1 shows an embodiment of a programmable controller and its programming device according to the present invention.

The programming device 1 includes a CPU (microprocessor) 3, a ROM (read-only memory) 4 that stores a system program, a RAM (random access memory IJ) 5 that stores a created control program, and a system program stored in the RAM 5. Interface device M6 for writing the control program to the programmable controller 2
, an input device 7 for inputting a control program, and a display device 8 for displaying the created control program.

On the other hand, the programmable controller 2 includes a program memory 9 that stores a control program, an input section 1o that inputs an external signal obtained from a controlled device (not shown) and converts it into external input data, and an input section 10 that receives external input data from the input section 10. A calculation unit 1 that executes calculations according to a control program based on
1, and a data memory 1 that stores external input data from the input unit 10, internal output data that is intermediate result data of calculations from the calculation unit 11, and external output data that is the calculation result.
2, and an output section 13 that outputs external output data as an external signal to a controlled object.

With the above configuration, when creating a control program to be used by the programmable controller 2, the following operations are performed.

First, an operator uses the input device 7 of the programming device 1 to input each command step etc. that constitutes the control program. As described above, the command step is composed of a command word, ten manual parameters, and an output parameter. This input/output parameter is an area number (device number, register number) of a storage area for storing external input data, external output data, and internal output data. In this embodiment, each of these data is stored in a specific storage area.

For example, the area number of the storage area that stores external input data is 0 to 100, the area number of the storage area that stores external output data is 101 to 200, and the area of the storage area that stores internal output data. Numbers are 201 to 30
It is predetermined to be number 0.

Therefore, the operator creates a list (hereinafter referred to as a classification list) in which each piece of data is defined in correspondence with the area number, and includes this list as part of the control program.

Note that this classification list may be prepared separately from the control program.

The programming device of the present invention utilizes this classification list and executes the diagnostic program shown in the second @ stored in the ROM 4 in advance to discover errors in the use of area numbers in the control program.

First, for one area number (device number or register number) defined in one category list, all instruction sets that use this number as a parameter are found (process 100). As explained above, these instruction sets consist of an instruction word, one or more input parameters, and one
It consists of two output parameters. Therefore, from the position of a parameter in an instruction step, it can be determined whether it is an input parameter or an output parameter. Therefore, in order to facilitate later judgment processing, the area number targeted for diagnosis is used to identify whether the area number used as an input parameter or the output parameter is used as an output parameter in each instruction set. A flag is set (same process 100). This flag is set equal to the number of instruction steps used for one area number.

Next, referring to the classification list described above, it is determined whether the area number is defined for external input data (determination 101).

If it is for external input data, process 100
Check all flags set in (process 102)
, if all of these flags point to input parameters, it is determined that there is no error in the usage of the parameters, and the diagnosis for that one area number is first completed. In this case, if there is an error in the use of the area number, that point is displayed on the display device 8 (FIG. 1) (process 108).

As a result, it is possible to discover errors in the case where all area numbers for external input data are not used as input parameters for command words, even though they should be used as input parameters.

The above process is repeatedly executed for all area numbers defined in the classification list.

On the other hand, if it is determined in judgment 101 that the area number is not for external input data, the first step is to refer to the classification list again and judge whether it is defined for external output data (decision 103). .

If the area number is for external output data, the flag is checked again to see if the area number is used as an output parameter (decision 104). If all the flags point to output parameters, it is determined that there is no error in the usage of the area number, and the diagnosis is terminated. On the other hand, if there is an error, the display device 8 (processing 1
) to that effect (processing 109).

As a result, it is possible to discover an error in the case where all area numbers for external output data are not used as output parameters of command words, even though they should be used as output parameters.

On the other hand, data that is neither external input data nor external output data is internal output data. Additionally, some parameters may have been misused even though they were not actually defined in the classification list.

In these cases, the processing is performed after judgment 105.

First, in process 100, a plurality of flags set for one area number are looked at, and it is determined whether any of them is used as a human parameter (determination 105).

If any parameter is used as an input parameter, it is further determined whether any parameter is used as an output parameter (decision 106).

If an area number defined as internal output data is used as an output parameter somewhere in the program, it will definitely be used as an input parameter somewhere else.

Focusing on this point, it is determined in decision 106 whether or not the use of area numbers for internal output data is appropriate, and if there is an error, it is displayed (decision 110).

Finally, if it is determined in decision 105 that the area number is not used as an input parameter, it is understood that this area number is not for external input data, external output data, or internal output data.

Therefore, it is determined whether the flag for that area number is not used as an output parameter (determination 10).
7).

If it appears to be being used as an output parameter, this is an error and a message to that effect is displayed (process 111). Then, if it is not used as an input parameter or an output parameter, it is determined that there is no error (judgment 1)
07).

According to the above method, the error judgment shown in Fig. 2 is made for each area number defined in the category list, and finally, even for the area numbers not defined in the category list, the control program Since the same judgment is made regarding the area numbers used, the control parameters can be thoroughly diagnosed.

In addition to the above examples, diagnostic methods include determining how to use parameters for each command step in the control program, and classifying input parameters, output parameters, and area numbers by type. After that, various methods can be used, such as comparing with a classification list.

By the above-described diagnostic program, area numbers and the like that are found to be incorrect in use are sequentially displayed on the display device 8. The operator sees this, corrects the error in the use of the area number, debugs using the input device 7, and re-stores the correct control program in the RAM 5.

In this way, a correctly modified control program can be
5 to the program memory 9 of the programmable controller 2 via the interface 6. Thereby, the programmable controller 2 can control the controlled equipment without error using the control program stored in the program memory 9.

[Effects of the Invention] As described above, according to the present invention, errors in the use of parameters of each instruction word of a control program can be easily discovered. Therefore, the time required for depacking work can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a programming device for a programmable controller of the present invention and a programmable controller connected thereto, and FIG. 2 is a flowchart of a diagnostic program for the programming device of the present invention. DESCRIPTION OF SYMBOLS 1... Programming device, 2... Programmable controller, 3... CPU, 4... ROM, 5...
...RAM. 6...Interface, 7...Input device, 8...
Display device, 9... Program memory, 10... Input section, 11... Arithmetic section, 12... Data memory, 13
・・・Output section・

Claims (1)

[Claims] In a device for diagnosing a control program of a programmable controller that operates by using a command step in a control program consisting of a command word and an input parameter and an output parameter that specify data for executing this command, an external input a first determination means for determining whether an area number of a storage area storing data is used as an input parameter of a command word in a program; a second determining means for determining whether the area number of the storage area storing the internal output data is used as an output parameter and an input parameter for the command word in the program; a third determining means for determining; a fourth determining means for determining whether an area number of another storage area is used as an input parameter or an output parameter of a command word in the program; and these determining means. 1. A programming device for a programmable controller, characterized in that a display means is provided for displaying a determination result.