JPH0313605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sequence program that includes a series of sequence programs stored in a memory of a sequence controller, etc.
A program display device that displays only blocks that include output instructions related to specified output elements, and more specifically, when sequence programs that include output instructions related to the same output element are programmed in duplicate, these This invention relates to a new program display device for a sequence controller that can display all programs.

In a sequence controller that performs sequence control by repeatedly executing a sequence program stored in a memory, if programs that use the same element as an output element are programmed repeatedly,
Depending on the state of the conditional input, an output element may be activated in one program and the same output element may be deactivated in another program, and in such a case, each time the sequence program is executed, the above Since the output elements of the above will repeatedly turn on and off, resulting in abnormal operation, in the sequence controller described above, it is necessary to check whether programs that use the same element as an output command are programmed repeatedly. After storing the program, it is necessary to check it and correct the program if it has been programmed repeatedly.

For this reason, conventional program display devices have a function to search for blocks that have a specified element as an output element, and a function to limit the search range to the range entered using numerical keys, etc. The sequence program is read from the beginning of the sequence program without limiting the sequence program, and the corresponding block is searched. When the corresponding block is found, the storage location of the block is confirmed by the display on the address display. If the search range is limited to the memory address of the searched block or later and the search is performed again, and as a result a block containing an output instruction related to the specified element is searched again, this block is considered to be a duplicate program and the memory location is changed. After checking, the search range is again limited to the storage location of the searched block and the above operation is repeated, thereby checking whether there is any other block that contains an output instruction related to the specified element. I was trying to detect whether

Therefore, in this case, after the corresponding block has been searched, it is always necessary to enter the search range using the numerical keys and command a re-search.
There was a problem where the operation to detect duplicate programs was troublesome.

In view of these conventional problems, the present invention, when an element number is set and a search command is issued, continuously searches all blocks containing output commands related to the element corresponding to this element number. This system solves the conventional problems by making it possible to display all searched blocks continuously, and an embodiment thereof will be described below with reference to the drawings.

In FIG. 1, 10 is a sequence memory 1
1. A sequence controller consisting of an arithmetic processing section 12, an input section 13, and an output section 14. The memory 11 stores logical operation instructions (TNA, TFA, TNO,
A sequence program is written using commands such as TFO, TNE, TFE) and output instructions (YON). Each storage address of the sequence memory 11 has a storage area of a predetermined bit, and one unit of sequence data consisting of an instruction part and an operand part is stored at each address. Note that when the programmed instruction word is a logical operation instruction or an output instruction, the element numbers (input/output addresses) of the conditional element and the output element are programmed into the operand section.

The sequence program stored in the sequence memory 11 is sequentially read out by the arithmetic processing section 12, and input/output elements connected to the input/output section are sequentially selected based on the data in the operand section. If the read sequence program is a logical operation instruction, the arithmetic processing unit 12 reads the on/off state of the selected input/output element as a condition element and performs a logical operation; is activated and deactivated based on the calculation result. In addition, when an interrupt signal INS is given from the outside, this arithmetic processing unit 12 temporarily stops reading and executing the sequence program, outputs the sequence program at the address specified from the outside, or turns on/off the specified element. It has a function to output the status.

On the other hand, 20 is a program display device that searches for and displays a block containing an output instruction related to a designated element.
2. Consists of operation display panel 23 and signal line SL
1 to SL4 and an interface 24 to the sequence controller 10.

The operation display panel 23 includes a numeric key 30 for setting the number of an output element, a search command key 31, a display change command key 32, a data display 40 for sequentially displaying the sequence program of the searched block, and A display 41 that displays the memory address of the program and an error display lamp PL are provided. To determine whether the
is used to set a predetermined element number, and then the search command key 31 is operated.

As a result, the arithmetic processing unit 21 uses the numeric keys 30
All blocks containing output commands related to the elements set in are read out from the sequence memory 1 of the sequence controller 10 and stored in the memory 22 together with the memory address in the sequence memory 11. After this, when the display change command key 32 is operated. Each time, the sequence program stored in the memory 22 and the memory address in each sequence memory 11 are read out in order and displayed on the displays 40 and 4.
1, respectively.

That is, when either command key 31 or 32 is operated, arithmetic processing unit 21 executes the processing routine shown in FIG. 2, and when search command key 31 is operated as in this case, step ( Step 40) moves to step (41) to search for a block containing an output command related to the set element. The detailed operation of step (41) will be described later, but if there is only one block in the sequence memory 11 that includes an output instruction related to the specified element as shown in FIG. As shown in Figure 5a, the programs are stored in order starting from the first address Po of buffer area BA1.
An end mark indicating the end of data is written after the output command YON100. In addition, buffer area BA2 contains sequence memory 1 of each sequence program written in buffer area BA1.
The data at memory address 1 is in the buffer area.
It is written to a position corresponding to the program write position in BA1.

When the search operation of the program is completed in this way, in step (42), the buffer area BA is
The read address counters RACA1 and RAC2 specify the read addresses in buffer areas BA1 and BA2, respectively.
are set respectively, and then the process moves to step (46). Step (46) is a step in which the sequence program is read from the address in buffer area BA1 specified by read address counter RAC1. If the data read in this step is an end mark, the process returns to step (42); otherwise, the process returns to step (42). Move to the display routine after step (48).

When you move to step (48), step (46)
The sequence program read out on the display 40
Perform the processing to display by step (50)
Then, the address data is read from the address in the buffer area BA2 specified by the read address counter RAC2 and displayed on the display 41, and the process returns to the main routine (not shown).

In this case, read address counter RAC1,
RAC2 has buffer areas BA1 and BA2, respectively.
6, the logic operation instruction TNA10 programmed at the start address of the buffer area BA1 by the above operation and the memory address 100 in the sequence memory 11 where this logic operation instruction was stored are as shown in FIG. It is displayed as shown in a.

Thereafter, when the display change command key 32 is operated, the arithmetic processing unit 21 executes the routine shown in FIG. (46) Perform the following processing. This results in
The sequence program TFA20 is stored at address Po+1 in buffer area BA1, and the sequence program TFA20 is stored at address So+1 in buffer area BA2.
The data indicating the memory address 101 of the TFA 20 is read out and displayed on the displays 40 and 41 as shown in FIG. Thereafter, the same operation is repeated every time the display change command key 32 is operated, and the sequence programs stored in the buffer areas BA1 and BA2 and their storage addresses in the sequence memory 11 are sequentially displayed.

Furthermore, if the display change command key 32 is operated after the output command is displayed as shown in FIG. , moves from step (47) to step (42), and writes buffer areas BA1, BA1, RAC2 to read address counters RAC1, RAC2.
The data at the first addresses Po and So of BA2 are set, and then the routine from step (46) onwards is executed again. As a result, the logical operation instruction TNA10 stored at the first address Po of the buffer area BA1 and its storage address are displayed again. Therefore, by repeatedly operating the display change command key 32, it is possible to repeatedly display the sequence program of the block including the output command related to the specified element and the memory address thereof.

Next, the detailed operation of step (41) will be explained based on FIG.

The first step (61) of the program search routine PSR is an initialization step, in which the read counter ROC specifies the read address of the sequence memory 11.
and an output counter OCC that counts the number of output instructions related to the same element, and resets the return address pointer RAP1, which will be described later, to zero.
Set the starting addresses Po and So of buffer areas BA1 and BA2 in RAP2, respectively, and also set the data of the starting addresses Po and So of buffer areas BA1 and BA2 to write address counters WAC1 and WAC2 that specify the write addresses of buffer areas BA1 and BA2. Set each.

Once such initialization is completed, step (61)
Then, the process moves to step (62) and the search for the block is started. Step (62) to Step (68)
The programs up to this point sequentially read the sequence programs from the sequence memory 11 and transfer them to the buffer area BA1, and also transfer the count value of the read counter ROC at the time of reading each sequence program to the buffer area BA2 as the memory address of each program. This is a routine that transfers data in order. At the start of operation, the read counter ROC is reset to zero as described above, and the write address counters WAC1 and WAC2 are set to Po and WAC2 at the starting addresses of buffer areas BA1 and BA2, respectively.
Since it is set to So, the above operation causes
The sequence program of the block programmed first in the sequence memory 11 and its storage address are stored from the first addresses Po and So of the buffer areas BA1 and BA2, respectively.

With this operation, one block of sequence program and its memory address are stored in the buffer area.
When written to BA1 and BA2, the arithmetic processing unit 21 determines in step (67) that the output command has been written to the buffer area BA11, moves to step (70), and writes the output command to the buffer area BA11.
It is determined whether the output command of the sequence program written to BA1 is related to the specified element, based on the element number programmed in the operand section. If it is determined that the item is related to the specified element, the process returns from step (70) to step (62) via step (72), and if it is determined that the item is not related to the specified element, the process returns to step (62). 71) and return to step (62).

For example, if a program containing an output command for the specified element is not stored at the beginning of the sequence memory 11, the above operation returns to step (62) via step (71), and from step (62) The program in step (68) is executed again to read one block of sequence program. At this time, the read counter ROC is incremented by the processing in step (71), and the write address counters WAC1 and WAC are set to the initial values Po and So of the return address designation pointers RAP1 and PAP2, respectively. ) to (68), one block of sequence program programmed following the sequence program transferred to buffer area BA1 by the previous operation and its memory address are the starting addresses Po, So of buffer areas BA1 and BA2. are stored in order from As a result, the sequence program first stored in buffer area BA1 will be automatically erased, and one block of the sequence program that has been programmed subsequently will be stored in buffer area BA1. The memory address of the sequence program newly stored in the buffer area BA1 is stored in the buffer area BA2.

By repeating the operation in this way, the sequence program stored in the sequence memory 11 and its storage address are sequentially read out in block units, and the sequence program of the last read block and its storage address are read out in sequence in block units. The addresses will be stored in buffer areas BA1 and BA2, respectively. Then, when it is determined in step (70) that the output command of the sequence program written to buffer area BA1 is an output command related to the specified element, the process moves from step (70) to step (72) and the write address is determined. counter
While incrementing WAC1 and WAC2, the data after these increments is transferred to the return address specification pointer RAP1,
Set each to RAP2 and read counter
After incrementing ROC and output element counting counter OCC, the process returns to step (62).

As a result, among the blocks containing output commands related to the specified element, the first searched block and its storage address are stored from the first address of buffer areas BA1 and BA2, respectively, and after this, this searched block The block containing the output command related to the specified element is searched again, with the search range starting from the memory address where the block was stored.
Then, when the corresponding block is searched again,
As shown in FIG. 5b, the sequence program of the retrieved block is stored in buffer area BA1 following the sequence program retrieved earlier, and the data at this memory address is stored in buffer area BA2 following the sequence program retrieved earlier. It is stored successively after the data representing the storage address of the sequence program.

By repeating such operations, all blocks containing output instructions of the specified element are searched from among a series of sequence programs stored in the sequence memory 11, and the programs of the searched blocks and their storage addresses are stored in the buffer area. BA
1. It will be stored in BA2.

Then, all the calculation programs stored in the sequence memory 11 are read out and programmed at the end of the sequence program.
When JMP000 is read, the process moves from step (63) to step (73), and the address specified by write address counter RAC1 of buffer area BA1 is read.
That is, as shown in Figure 5 a and b, an end mark is written immediately after the retrieved sequence program, and then, depending on whether the counter OCC count value is 2 or more, an output command regarding the specified element is written. It is determined whether or not the program has been programmed in duplicate, and if it is determined that the program has been programmed in duplicate, the error indicator lamp PL is turned on in step (76) and the routine returns to the routine shown in Figure 2. If it is determined that the program has not been programmed, the program returns to the routine shown in FIG. 2 with the end mark written.

When a block containing an output command related to the specified element is retrieved as described above, the program from step (46) in Figure 2 is executed, and as described above, the first address of buffer areas BA1 and BA2 is
The sequence program and memory address data stored in Po and So are displayed.

After this, each time the display change command key 32 is operated, the sequence programs stored in buffer areas BA1 and BA2 and the data at their memory addresses are displayed in order.
If there are duplicate blocks containing output commands related to specified elements, all sequence programs programmed in these blocks and their memory addresses are stored in buffer areas BA1 and BA2, as shown in Figure 5b. Therefore, as shown in FIG. 6B, by operating the display change command key 32, each sequence program in the overlapping blocks and their memory addresses can be displayed successively.

In addition, since the end mark is stored in the buffer area BA1 following the sequence program, when all the sequence programs and their memory addresses of the searched block are displayed, the read address counter is displayed as described above.
The contents of RAC1 and RAC2 are buffer area BA1,
It is set again at the starting addresses Po and So of BA2, and the searched sequence programs of the plurality of blocks and their storage addresses can be repeatedly monitored.

As described above, in the present invention, the sequence program stored in the memory of the sequence controller is read out in order, all blocks containing the output command of the specified element are searched, and the specified element is stored in the memory of the program device. Store sequence programs containing element output instructions in order,
Since the contents of this memory can be displayed continuously, if programs that have a common element as an output element are programmed overlappingly, the program display can be displayed by simply giving a search command to the program display device once. It has the advantage that the contents of sequence programs stored in the memory of the computer can be displayed continuously, and that it is possible to easily detect the contents of duplicate programs that have a common element as an output element.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing a status display device connected to a sequence controller, and FIGS. 2 and 3 show the operation of the arithmetic processing unit 21 in FIG. 1. Figures 4a and 4b are diagrams showing a state in which one and two programs each having a common element as an output command are stored in the sequence memory 11 in Figure 1, respectively, and Figures 5a and 5b are sequences. Diagrams showing the states of buffer areas BA1 and BA2 after the search when the contents of the memory 11 are as shown in FIGS. 4a and 4b, respectively. FIGS. FIG. 10...Sequence controller, 11...Sequence memory, 20...Program display device,
21...Arithmetic processing unit, 22...Memory, 23...
...Operation display panel, 30...Numeric keys, 31...
Search command key, 32...Display change command key, 40
...Data display, 41...Address display,
PL...Error indicator lamp.

Claims (1)

[Claims] 1 A program display device for a sequence controller that searches for and displays a sequence program related to the on/off of a specific element from a series of sequence programs stored in the memory of the sequence controller, and which searches for and displays a sequence program related to the on/off of a specific element. an element specifying means for specifying an element; and a sequence program stored in the memory is sequentially read out until all blocks including output instructions regarding the element specified by the element specifying means are read out from the sequence program. a designated element storage means for storing a sequence program in units of blocks retrieved by the retrieval means; and an output instruction regarding the element designated by the element designation means at the time of the retrieval by the retrieval means. a duplication determining means for determining that two or more blocks have been retrieved; an abnormality displaying means for displaying an abnormality when the duplication determining means determines that there is a duplication; and an abnormality display means for continuously reading the contents of the specified element storage means. What is claimed is: 1. A program display device for a sequence controller, comprising: readout control means for displaying content read out by the readout control means; and display means for displaying content read by the readout control means.