JPH04195428A - Programmable controller - Google Patents

Abstract

PURPOSE:To easily correct program instructions by discriminating the double use of an output instruction based on stored contents of the storage circuit of a storage control means and displaying the address of a program memory also. CONSTITUTION:A program read means 200, an output instruction discriminating means 300, and a storage control means 400 are provided. After the program stored in the program memory is successively read out to register the double use of the output instruction in first and second storage circuits of the storage control means 400, the program is successively read out again from the program memory, and contents registered in first and second storage circuits are discriminated by a double write discriminating means 500, and the detection result is outputted to a display part or a printing part by an output means 600 if double write is detected. Thus, all storage positions of specific instructions related to double write in the program are reported to an operator, and the correction processing of double write instructions is easily performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a programmable controller, and in particular includes a program instruction double-write check device for detecting program instructions that are used repeatedly in a created program. This invention relates to a programmable controller.

[Conventional technology]

The procedure for checking double writing of program instructions in a conventional programmable controller will be explained with reference to FIG.

In FIG. 6, reading program instructions from the beginning of a sequence program stored in a program memory;
Detects that this read program instruction is an output instruction (an instruction that instructs the device specified by the output number of the output instruction to output information; double writing of the output number must be prohibited). Then, based on the output number of the read output command, for example B12, bits are stored in the storage area corresponding to the output number B12 in the output number storage circuit created in advance on the memory as shown in FIG. 1"
Register. This bit information indicates that the output instruction is used in the program.

In this way, the output instructions in the program are sequentially detected, and the new output numbers of the output instructions are registered for use.

When a double-write output command is detected for output number B12, the bit information in the area corresponding to output number B12 of the storage circuit is already "1°", so at this point the output number is used twice. At this time, by displaying output number B12 or the output command that includes the output number, the operator is informed of the duplicated output number.In this way, all output commands from the program are displayed. By detecting , double-written output numbers are detected.

[Problem to be solved by the invention] Based on this method, double-written program instructions (
However, in conventional devices, when the same output command is detected for the second time, it is determined that the output command is a double write command. For this reason, the output command detected the first time is considered normal, so the first storage location in the program or the address of the program memory could not be detected by the conventional device.

Conventionally, the operator displays the program information on the display screen, and then visually checks the double-written output number on the display screen to detect the double-written output command and detect the output number of the error in the program. A correction has been made to the issue. As a result, there is still room for improvement in the conventional apparatus in that it takes time to correct a program instruction that causes double writing of output.

Therefore, the purpose of the present invention is to eliminate the drawbacks of the conventional device,
To provide a double-write check device for program instructions that can facilitate correction processing for double-write instructions by informing an operator of all storage locations of specific commands regarding double-writes in a program. It is in.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a programmable controller that detects program instructions that are used repeatedly from a created program, and includes a reading means for sequentially reading out programs from a program memory, and a reading means for reading out programs by the reading means. an output instruction determining means for determining whether the content of the program executed is an output instruction; and first and second storage circuits having storage areas corresponding to output numbers of the output instructions, the output instruction determining means Every time a main instruction is detected by storage control means for logically ANDing the output of the sum and the content of the storage area corresponding to the output command of the second storage circuit, inverting the result and storing it in the corresponding area of the second storage area; After the reading from the program memory is completed, the program is read from the program memory again by the reading circuit, and when the contents of the read program are detected as an output command by the output command determining means, the storage control means double writing determining means for determining whether or not the output instruction is used repeatedly based on the memory contents of the first and second memory circuits; and double writing is detected by the double writing determining means. The present invention is characterized in that it includes an output means for outputting to a display section or a printing section that double writing is occurring when a double writing occurs.

[For production]

After sequentially reading out the programs stored in the program memory and registering the duplicate use of the output command in the first and second storage circuits of the storage control means, the programs are read out in sequence from the program memory again and stored in the first and second storage circuits. Due to the overlapping use state registered in the circuit, not only the output number detected for the second time onwards, but also the output number detected for the first time can be outputted as being double writing.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the basic configuration of an embodiment of the present invention.

In FIG. 1, 100 is a program memory storing a program created by a programming device to be described later, 200 is a reading means for sequentially reading the program from the program memory 100, and 300 is an output command for the program commands read by the reading means 200. Output command determining means 400 determines whether the output command is 1'? a storage control means having first and second storage circuits each having a region, and registering in the first and second storage circuits whether or not an output instruction is written twice;
500, after reading the program from the program memory is completed and double writing is registered in the first and second storage circuits of the storage control means, the program is read out sequentially from the program memory again, and the g[HjQ control means A double write determination unit 600 visually displays or prints the information code and program memory address of the output instruction detected as double write. This is an output means for printing out data.

FIG. 2 shows a circuit configuration of a programming device to which the present invention is applied.

In FIG. 2, a central processing unit W (CPU) 10. System memory 20. Program memory 30 (program memory 100), work memory 40. A keyboard input device 501, a display surface 60 (display means 600), and an input/output interface (Ilo) 70 are commonly connected to the lotus.

In addition to controlling the entire device, the CPU 10 also executes processing for creating and editing sequence programs to be executed in the programmable controller and double-writing check processing for program instructions related to the present invention.

As will be described later, CPIIIO operates as a reading means, an output command determining means, a storage control means, and a double writing determining means of the present invention.

A readable/writable non-volatile memory is used as the system memory 20, and the first and second memory circuits 2 are used for control procedures executed by the CPU10 and double write check.
1 is stored. Note that the first and second memory circuits 2
I may be stored in a work memory 40, which will be described later.

The first and second storage circuits 2I have a first table 211 and a second table 21 with a double structure, as shown in FIG.
The first table 211 and the second table 212 each have a storage area corresponding to the output number of the output command.

The program memo IJ30 stores a sequence program to be transferred to the programmable controller.

When program information is input from the keyboard input device 50, creation 1 editing processing is executed on this program memory. Also, a floppy disk storage device (not shown)
The created program information read from the floppy disk via the floppy disk is stored as is in the program memo IJ30.

The work memory 40 is used for temporary storage of input/output information for the CPLIIO. The keyboard input device 50 inputs program commands and numbers 1 constituting the sequence program.
Input text information and operation instructions for CP tl' IO.

The display device 60 displays the display information received from CP[llO as an output means of the present invention. The sequence program to be created or modified is displayed in the graphical form of a sequence circuit.

11070 is connected to a programmable controller and a floppy disk device, and transfers input/output information.

The double write check process for output commands in such a circuit configuration will be explained with reference to the flowcharts of FIGS. 4 and 5. FIG. 4 shows a processing procedure for detecting an output command from a program, detecting double writing for the same output number, and registering it in the first table and the second table of the storage control means. FIG. 5 shows a processing procedure for detecting a double-written output instruction and displaying the information code of the output instruction and the address of the program memory.

These processing procedures are actually written in the CPIIIO executable programming language.

When the operator instructs double writing check processing from the keyboard input device 50, the CPU 10 clears the storage area corresponding to each output number of the first and second tables 211, 21.2 to bit “0°”. Step S1 in FIG. 4), then reset the counter value of the program counter, initialize the program address, and set address i (step S2 in FIG. 4).
The IIO reads the program instruction at the beginning of the program from the program memory 100 using the reading means 200, and the output instruction determining means 300 determines whether the read program instruction is an output instruction (step 53.S4 in FIG. 4). ). When the output instruction determining means 300 determines that the read program instruction is not an output instruction, the CPt11O determines whether the read program is at the final address based on the counter value of the program counter. In step S8), if it is not the final address, "1" is added to the program counter and the program is read from the program memo U100 (steps S9→S3 in FIG. 4).

When the output instruction determining means 300 determines that the read program instruction is the output instruction 1, for example B12 (step S4 in FIG. 4), the CPU 10 is set to the output number of the output instruction in the first table 2. Read the corresponding storage area, take the exclusive OR of this read information and pit 1'°, and output the exclusive OR to the first
It is written in the storage area corresponding to the output number of the table output command (steps S5 and S6 in FIG. 4). Next, C.P.
IIIO logically ANDs the output of the exclusive OR with the storage area information corresponding to the output number of the output instruction in the second table, inverts the output of this logical product, and calculates the logical product of the output instruction in the second table. Write to the storage area corresponding to the output number (
Step S7 in FIG. 4).

In this way, double writing of output commands is checked,
For example, if the output instruction B12 is used multiple times, the storage areas corresponding to the output instruction B12 in the first table 2+1 and the second table 212 change as follows.

1st table 2nd table 0th time 0 0 1st time 11 2nd time 01 3rd time 10 4th time 01 That is, 1st table 211. The storage contents of the second table 212 are stored in the first table 211 and the second table 212 when the output command is used twice or more.
The memory contents no longer match.

When the program in the program memory 100 has been checked up to the final address as described above (step S8 in FIG. 4), the process proceeds to the processing procedure in FIG. 5.

In FIG. 5, after setting the read address i to the first address of the program memory 100, the read means 20
0 to read out the program instruction at this address (step 510.Sll'' in FIG. 5).Reading means 200
The output instruction determination means 300 detects that the program instruction read out is an output instruction. Second table 21
1. Read the contents of the storage area of 212 (step 513 in FIG. 5), the first and second tables 21],
It is determined whether the contents of the storage areas 212 match (step 514 in FIG. 5). As described above, since the stored contents of the first and second tables do not match regarding the output number of double writing, the output command is determined to be double writing. In response to this determination, CPU10 transfers an information code indicating the output command, an information code indicating the output number, and an information code indicating the address of the program memory to the display means 600 (step 515 in FIG. 5).
.

When the output instruction determination circuit 300 determines that the program instruction is not an output instruction (step 512 in FIG. 5)
Alternatively, if it is determined that the stored contents of the first and second tables 211 and 212 do not match (step 512 in FIG. 5), the address being read is the last address of the program based on the count value of the program counter. (Step 516 in Figure 5)
If the address is not the final address, "1" is added to the program counter to continue reading the program from the program memory (step 5ll in FIG. 5), and the same procedure as described above is repeated. If it is determined in step 516 of FIG. 5 that the address is the final address of the program based on the contents of the program counter, the double write check procedure ends.

〔Effect of the invention〕

As explained above, according to the present invention, in a programmable controller that detects program instructions that are used repeatedly from among created programs, a reading unit that sequentially reads programs from a program memory;
output instruction determining means for determining whether the content of the program read by the reading means is an output instruction;
It has first and second storage circuits each having a storage area corresponding to an output number of an output instruction, and each time a main instruction is detected by the output instruction determining means, the output instruction and the output number of the first storage circuit are stored. an exclusive OR with the contents of the storage area corresponding to the output instruction, and store the result in the first storage circuit, and the output of the exclusive OR and the contents of the storage area corresponding to the output command of the second storage circuit. storage control means for taking the logical product of and inverting the result and storing it in the corresponding storage area of the second storage area; When the content of the read program is detected as an output instruction by the output instruction determination means, whether the output instruction is used repeatedly based on the storage contents of the first and second storage circuits of the storage control means. double writing determination means for determining whether or not double writing is present, and output means for outputting to a display unit or a printing unit that double writing is detected when double writing is detected by the double writing determination unit. This not only detects double writing of an output command, but also displays the location of the first use of the output command, that is, the program memory address. There is no need to visually search for program instructions, and the corresponding program instructions can be corrected immediately.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing the circuit configuration of an embodiment of the present invention, and FIG. 3 is a first table of the embodiment of the present invention. FIGS. 4 and 5 are flowcharts showing the control procedure executed by CPU10 in FIG. 2, and FIG. 6 is an explanatory diagram showing the double write check in the conventional example. It is. 10: cPu, 100 nib program memory, 200: reading means, 300: output command determining means, 400: storage control means, 500° double writing determining means, 600: output means. Figure 1 Figure 4 Figure 5

Claims (1)

[Claims] 1) In a programmable controller that detects duplicated program instructions from a created program, the programmable controller includes a reading means for sequentially reading programs from a program memory, and the contents of the program read by the reading means are output instructions. It has an output instruction determination means for determining whether or not there is an output instruction, and first and second storage circuits having storage areas corresponding to output numbers of output instructions, and each time a main instruction is detected by the output instruction determination means, An exclusive OR of the output command and the contents of the storage area corresponding to the output number of the first storage circuit is taken and stored in the first storage circuit, and the output of the exclusive OR and the content of the storage area corresponding to the output number of the first storage circuit are stored. storage control means for logically ANDing the output command with the contents of the storage area corresponding to the output command and storing the inverted result in the corresponding storage area of the second storage area; and after the reading from the program memory is completed; When the program is read out from the program memory again by the reading circuit and the content of the read program is detected as an output command by the output command determination means, the storage contents of the first and second storage circuits of the storage control means a double writing determination means for determining whether or not the output command is used twice based on the double writing; and a display unit indicating that the double writing is a double writing when the double writing is detected by the double writing determining means. or an output means for outputting to a printing section.