JP2000035809A - Programmable controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently use a storage area by providing a block setting means for storing block information in the other part of the block storage area. SOLUTION: Plural 'blocks' generated in a block generation device 1 are sent to a block setting means 2. The block setting means 2 sequentially stores the 'blocks' from the head address of a storage area in a block/block information storage means 5 and inversely stores information in the respective 'blocks' from the last address of the storage area of the block/block information storage means 5 to the head address. The block setting means 2 stores a block 'B101' in the head address of the storage area of the block/block information storage means 5 and inversely stores block information 'I101' from the last address to the head address, for example. At last, the 'block' and 'block information' are stored in the block/block information storage means 5 until an area 'E101' becomes '0'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller for structured programming,
In particular, the present invention relates to a programmable controller that can efficiently use a storage area.

[0002]

2. Description of the Related Art In a conventional programmable controller corresponding to structured programming, one program is divided into a plurality of "blocks" for each function, and each program is hierarchically structured and executed.

FIG. 2 shows such a conventional programmable device.
FIG. 3 is a configuration block diagram illustrating an example of a controller. FIG.
In the figure, 1 is a block creation device such as a computer, 2 is a block setting unit, 3 is a block storage unit, and 4 is a block information storage unit. 2 to 4 constitute the programmable controller 50.

[0004] The "block" output from the block creation device 1 is connected to the block setting means 2, and the output of the block setting means 2 is connected to the block storage means 3 and the block information storage means 4.

Here, the operation of the conventional example shown in FIG. 2 will be described. The plurality of "blocks" created by the block creation device 1 are sent to the block setting means 2, and the block setting means 2 stores the sent "blocks" in the block storage means 3 and stores the information of each "block". It is stored in the block information storage means 4.

[0006] For example, the block setting means 2 uses "B" in FIG.
"001" is stored in the block storage means 3 and the "block" shown in "B001" in FIG.
, The file name of the “block”, the size of the “block”, and the date and time of creation of the “block” are extracted as block information. The information is stored in the block information storage means 4 as indicated by "I001" in FIG.

[0007] Similarly, the block setting means 2 uses "B" in FIG.
“002” is stored in the block storage means 3 and the block information shown as “I002” in FIG.

Then, the programmable controller 5
By reading and executing “block” storing “0” based on “block information”, various controls can be performed.

As described above, by the structured programming,
Dividing one program into “blocks” for each function has the effect of reducing the program creation time and debug time because the program structure is organized. In addition, since a plurality of persons can create and debug each function, division of labor is facilitated.

[0010]

However, in the conventional example shown in FIG. 2, since the block storage means 3 and the block information storage means 4 each secure a fixed storage area, one of the storage areas is full. Then, there is a problem that "block" cannot be stored even if the other storage area has room.

For example, even if there is room in the free space of the block storage means 3 indicated by "E001" in FIG.
02 "of the block information storage means 4 is"
If it is "0", the block setting means 2 cannot store the "block" in the block storage means 3.

Conversely, if the free area of the block storage means 3 indicated by "E001" in FIG. 2 is "0", "E00" in FIG.
2 ", the block setting means 2 cannot store the" block "in the block storage means 3 even if there is room in the free space of the block information storage means 4 shown in FIG.

That is, a program in which the number of divided blocks exceeds the maximum number of storage blocks of the block information storage means 4 but the block information storage means 4 becomes full, although the capacity of all blocks is small, However, there is a problem that a program that is small but has a large capacity of all blocks and the block storage means 3 becomes full cannot be stored in the programmable controller 50. Therefore, an object of the present invention is to realize a programmable controller that can efficiently use a storage area.

[0014]

In order to achieve the above object, according to a first aspect of the present invention, in a programmable controller corresponding to structured programming, one program is divided for each function. A block / block information storage unit in which a storage area for storing a plurality of blocks and a plurality of block information, which are various types of information respectively related to the plurality of blocks, are integrated; Block setting means for storing a plurality of blocks in a part of the storage area, obtaining the plurality of block information from the plurality of blocks, and storing the information in another part of the storage area, Can be used efficiently.

According to a second aspect of the present invention, in the programmable controller according to the first aspect, the block setting means stores the plurality of blocks sequentially from a start address of the storage area, and By storing information sequentially from the last address of the storage area to the start address, the storage area can be used efficiently.

According to a third aspect of the present invention, in the programmable controller according to the first aspect, the block setting means stores the plurality of block information sequentially from a head address of the storage area, and By storing blocks sequentially from the last address of the storage area to the start address, the storage area can be used efficiently.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of a programmable controller according to the present invention. 1, reference numerals 1 and 2 denote the same parts as in FIG. 2, and reference numeral 5 denotes a block / block information storage unit. Also, 2 and 5
Constitutes the programmable controller 51.

The "block" output from the block creation device 1 is connected to the block setting means 2, and the output of the block setting means 2 is connected to the block / block information storage means 5.

Here, the operation of the embodiment shown in FIG. 1 will be described. The plurality of “blocks” created by the block creation device 1 are sent to the block setting means 2, and the block setting means 2 converts the sent “blocks” from the head address of the storage area of the block / block information storage means 5. The information is sequentially stored and the information of each "block" is stored from the last address of the storage area of the block / block information storage means 5 back to the first address.

For example, the block setting means 2 shown in FIG.
The "block" indicated by reference numeral 101 "is stored at the start address of the storage area of the block / block information storage means 5, and the block information indicated by" I101 "in FIG. Store back to the address.

Similarly, the block setting means 2 sets "B" in FIG.
The "block" indicated by "102" is sequentially stored in the block / block information storage means 5 from the address next to "B101" in FIG. 1, and the block information indicated by "I102" in FIG. The data is sequentially stored in the block / block information storage unit 5 from the next address to the head address.

Finally, "block" and "block information" can be stored in the block / block information storage means 5 until the empty area indicated by "E101" in FIG. 1 finally becomes "0". .

That is, the storage areas of "blocks" and "block information" are integrated without being individually divided, and "blocks" and "block information" are sequentially stored from both ends of the recording area. Can be used.

Therefore, in the case of a program in which the capacity of all blocks is small but the number of divided blocks exceeds the maximum number of storage blocks, which is a problem in the conventional example, the block / block information storage means 5 Since the area in which the “block information” is stored in the storage area can be made large, the storage in the programmable controller 51 becomes possible.

In the case of a program in which the number of divided blocks is small but the capacity of all blocks is large, it is necessary to increase the area where the "block" is stored in the storage area of the block / block information storage means 5. Therefore, the data can be stored in the programmable controller 51.

As a result, the block / block information storage means 5 for storing both "block" and "block information" is provided, and "block" and "block information" are stored from both ends of the recording area of the block / block information storage means 5. Are sequentially stored, the storage area can be used efficiently.

In the embodiment shown in FIG. 1, "block"
Is stored from the head address of the storage area of the block / block information storage means 5, and "block information" is stored from the last address of the storage area of the block / block information storage means 5 back to the head address. It does not matter.

[0028]

As is apparent from the above description,
According to the present invention, the following effects can be obtained. According to the first to third aspects of the present invention, a block / block information storage unit for storing both blocks and block information is provided, and blocks and block information are sequentially stored from both ends of a recording area of the block / block information storage unit. By doing so, a programmable controller that can use the storage area efficiently can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing one embodiment of a programmable controller according to the present invention.

FIG. 2 is a configuration block diagram showing an example of a conventional programmable controller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Block creation apparatus 2 Block setting means 3 Block storage means 4 Block information storage means 5 Block / block information storage means 50, 51 Programmable controller

Claims (3)

[Claims] 1. A programmable controller compatible with structured programming, comprising: a plurality of blocks obtained by dividing one program for each function; and a plurality of block information, which is various information associated with each of the plurality of blocks. A block / block information storage unit having an integrated area; storing the plurality of blocks input from an external block generation unit in a part of the storage area; and storing the plurality of block information from the plurality of blocks. And a block setting means for storing the data in another part of the storage area. 2. The method according to claim 1, wherein the block setting means stores the plurality of blocks sequentially from a start address of the storage area, and stores the plurality of block information sequentially from a last address of the storage area to a start address. The programmable controller according to claim 1, wherein: 3. The block setting means stores the plurality of block information sequentially from a start address of the storage area, and sequentially stores the plurality of blocks from a last address of the storage area to a start address. The programmable controller according to claim 1, wherein: