JPS6010332B2 - Duplicate use check device for output instructions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a program memory checking device for a sequence controller that employs arithmetic processing based on a so-called iterative arithmetic method that executes arithmetic operations for all program steps at once, and particularly relates to a check device for checking a program memory of a sequence controller that employs arithmetic processing based on a so-called iterative arithmetic method that executes arithmetic operations for all program steps at once. The present invention relates to a checking device that automatically checks for duplicate use of instructions and displays information regarding the duplicate use.

A sequence controller executes a predetermined operation according to a program stored in memory, but in the case of a sequence controller that uses arithmetic processing using a repetitive calculation method, as mentioned above, the same output command may be stored in a program stored in memory. If they are used repeatedly, there is a problem that depending on the position of the program, the output instruction at the beginning of the operation order may be ignored and the operation will not be executed according to the program.

For example, in the case of the program examples shown in Figures 1 and 2, addresses 1003 to 1006 in Figure 2 are valid for the output command "OUTY IOO", and addresses 000 to 1006 are valid.
Instruction 0004 becomes invalid. Therefore, if the intention of the output command "OUTY IOO" in this program is to be in the ladder at addresses 0000-0004, then the number 100 of the output command at address 1006 is incorrect, and the sequence controller executes the operation according to the program. This means that they no longer do so. Therefore, in the past, it was necessary to check that the output numbers are correctly allocated and then check the output instructions of the entire program one step at a time, or to program the program stored in memory using a peripheral device such as a typewriter. It is necessary to make a list of all the items and check them one by one, which is a tedious task, and therefore, a large amount of time and cost is unavoidable for checking.

In view of the above-mentioned conventional drawbacks, the present invention provides an output instruction overlapping use checking device that automatically checks a program stored in a program memory of a sequence controller and quickly recognizes whether or not an output instruction is overlappingly used. It provides:

SUMMARY OF THE INVENTION An object of the present invention is to provide a device for checking duplicate use of output instructions that can automatically and quickly check for duplicate use of output instructions in a program stored in a memo file. Another object of the present invention is to provide an output instruction overlapping use checking device capable of displaying the presence or absence of overlapping use of an output instruction and the address where the overlappingly used output instruction exists.

An embodiment of the present invention will be described below based on the drawings. FIG. 3 shows a block diagram of an output instruction duplication check device according to the present invention.

(In addition, the program memory 4 in the figure indicates the memory of the sequence controller.) In the figure, 1 indicates a check instruction means for instructing to check for duplicate use of output commands. A signal instructing to reset the printer 9 is output to the write circuit 8, and a signal to reset the printer 9 is output to the address counter 2.

The address counter 2 is connected to the program memory 4 (this memory is the program memory of the sequence controller).

), and the program output circuit 3 at the next stage sequentially reads out the contents of the addresses from the program memory 4 based on the address information output from the counter 2. Reference numeral 5 indicates a HIGH level signal when the content of the address transferred via the program output circuit 3 is an output command (OUT command), and a LOW level signal otherwise, to the next stage inverter G, The detection circuit 5 also transfers the output number corresponding to the detected output command to the detection circuit 6 and the output number use check circuit 7 when it detects an output command.

This output number is used to determine the usage status of the output number from the storage section 9, and to store in the storage section 9 that the output number has been used after checking. Therefore, when the address counter 2 becomes "0000" due to the reset signal, the program logic circuit 3 transfers the contents of the program "000" from the program memory 4 of the sequence controller to "STAXOOO" (see FIG. 2). 1 and transfers it to the output command detection circuit 5 at the next stage.

The detection circuit 5 detects the transferred address “0000”.
Since the content of ' is not an output command, a LOW level signal is output to inverter G, and this signal is sent to inverter G,
, are applied to AND gate G4 via OR gate G3. At this time, since HIGH level signals are output from inverters G2 and G5, mGH of clock circuit 10 is
The AND gate G operates at the output timing of the level signal, and the address counter 2 counts up to "000r" in response to the operation of the address up instruction circuit 11 at the next stage. From there, the contents are sequentially read from address "0000" until the contents become an output command.

Based on the output number transferred from the output command detection circuit 5, the detection circuit 6 reads the usage status of the output number from the storage section 9, and transfers it to the output number usage check circuit 7 at the next stage.

The output number usage check circuit 7 checks the usage status signal from the output circuit 6, and outputs a LOW signal to the inverter G2 if it is unused, and a HIGH signal if vice versa.

In addition, when the output number is transferred from the output command detection circuit 5, the check circuit 7 should record the output number as used in the storage circuit 9. Output. At this time, the write circuit 8 outputs the mGH level signal to the OR gate G3. The overlapping usage state display conversion circuit 13 receives the LOW level signal from the inverter G2 and operates to display the overlapping state on the display unit 15, and also receives the LOW level signal from the inverter G2. In response, the display section 15 operates to display that there is no overlap.

On the other hand, the address output display conversion circuit 14 is connected to the inverter G.
In response to a LOW level signal from the address counter 2, the address counter 2 operates to display the contents of the address counter 2 at this time on the display section 15. When the address detection circuit 12 detects the end of the program memory from the contents of the address counter 2, it outputs an mGH level signal to the next stage inverter G5, and displays on the display section 15 that there is no duplicate use.

It is designed so that it can be recognized that all Gram checks have been completed. Therefore, as described above, the program is sequentially checked by counting up the address counter 2, and then, for example, the address "000" in FIG.
When the content "OUTYIOO" of r is transferred to the output command detection circuit 5, since this content is an output command, a HIGH level signal is applied to the inverter G, and the AND gate G4 is closed and the address counter is 2 is stopped.

On the other hand, the output instruction detecting circuit 5 transfers the output number "YIOO'' of the output instruction detected at this time to the admonition circuit 6 and the output number use check circuit 7.

The output circuit 6 reads out the usage status of the output number "YIOO'' from the storage section 9 and transfers it to the check circuit 7.
At this time, since the contents of the storage section 9 are all in a reset state, the check circuit 7 determines that the output number "YIOO" is unused, and outputs a LOW level signal to the inverter G2. On the other hand, the write circuit 8 receives the signal from the check circuit 7, stores in the storage section 9 that the output number "YIOO" is used, and sends a HIGH level signal to the AND gate G4 via the OR gate G3. In order to output the address, the address counter 2 starts counting operation again and the contents of the subsequent address are checked.

In this way, the contents of the addresses are sequentially checked again, and for example, the contents of the address "1006" in FIG.
When TYIOO'' is transferred to the output command detection circuit 5,
Since this content is an output command, the address counter 2 stops as before, and the output number ``YIOO'' is the readout circuit 6.
and is transferred to the check circuit 7.

Then, in the output circuit 6, the output number "YIOO" is stored in the storage section 9.
” is transferred to the reading check circuit 7,
As mentioned above, the output number “YIOO” is the address “00”.
04'' has already been used, the check circuit 7 outputs a HIGH level signal to the inverter G2, and the AND gate G
4 to stop the count-up operation of the address counter 2. On the other hand, the LOW level signal of inverter G2 is applied to the overlapping usage state display conversion circuit 13 and the address logical output display conversion circuit 14, and it is confirmed that the output command is being used overlappingly, and the contents of the address counter 2 at this time, i.e., the output The address “100” where the instruction was used twice is displayed on the display unit 15.
is displayed, and the duplication check operation for a series of output commands is completed. If the output command is not used in duplicate, the address detection circuit 12 outputs an H level signal to the inverter G5 when the program memory is finished, and the operation of the address counter 2 is stopped. A LOW level signal is derived to the overlapping usage status display conversion circuit 13, and a display indicating that there is no overlapping usage is performed on the display section 15. As described above, it is possible to automatically check whether or not an output instruction is used repeatedly, and to display the presence or absence of duplicate use and the address of the location where the output instruction is used repeatedly.

As explained in detail above, according to the output instruction duplicate use check device of the present invention, it is possible to automatically and quickly check the duplicate use of output instructions in a program, and to check whether there is duplicate use or not. If there is a use, the location (address) can be displayed, so that the program can be modified easily and in a short time.

[Brief explanation of the drawing]

Figure 1 is a program ladder diagram for explaining the conventional example.
FIG. 2 is a diagram of the coding sheet, and FIG. 3 is a block diagram of the apparatus of the present invention. 1 is a check instruction device, 2 is an address counter, 3 is a program read circuit, 4 is a program memory, 5 is an output command detection circuit, 6 is a read circuit, 7 is an output number use check circuit, 8 is a write circuit, 9 is a 10 is a clock circuit; 11 is an address up instruction circuit; 12 is an address detection circuit; 13 is a duplication status display conversion circuit; 14 is an address low display conversion circuit; 15 is a display section. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A read circuit that sequentially reads the contents of addresses from the program memory, an output command detection circuit that detects an output command from the contents of the addresses sequentially read by the read circuit, and when the output command is detected by the detection circuit. , reads the usage status of the output number corresponding to the output command from the storage unit that stores the usage status of the output number, checks for duplicate use of the detected output command, and after checking, stores the detected output command in the storage unit. An output instruction comprising: an output number check circuit that operates to store whether the output number corresponding to the output number has been used; and a display section that displays information regarding duplicate use in response to a check result in the check circuit. Duplicate use check device.