JPS6210804Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an electronic sequence control device, and more particularly, to converting the contents stored in the storage section of the electronic sequence control device into a desired symbol, for example, in the form of a developed diagram of a sequence. The present invention relates to an electronic sequence control device suitable for print display.

[Prior art]

An electronic sequence control device processes input information from an external device according to a predetermined program stored in a storage unit, derives the result of the calculation as output information, and performs sequence control accordingly. It is.

When such an electronic sequence control device stores a program corresponding to a sequence diagram using relays (hereinafter referred to as a development diagram) as shown in FIG. Moreover, there are some that can be used and displayed as an image on a display device such as a cathode ray tube (CRT) in the same format as the developed view shown in FIG.

FIG. 2 is a block diagram showing an example of a conventional electronic sequence control device equipped with the above-mentioned display device. In FIG. 2, an input section 1 receives signals from external devices such as operation switches and limit switches. A sequence program is stored in the storage unit 3 in advance, and when reading of the sequence program is started, the control unit 4 calculates the input signal introduced into the input unit 1 according to the read program. Send to section 5,
Then, a predetermined calculation is performed. The result of the calculation is then delivered to the output section 2, and the output signal from the output section 2 controls external devices such as valves and motors. In order to display the contents of the program stored in the storage section 3 using the predetermined symbols as described above, which part of the program stored in the storage section 3 is displayed on the display section 11.
The operation section 6 includes a keyboard switch or the like that generates an operation signal such as specifying whether to display the program on the computer. A write operation is performed on. This refresh memory 8 is configured to store symbols transferred from the storage section 3 and to be displayed on the display section 11, and to be read out repeatedly at a predetermined period. The code signal of the symbol read out from the refresh memory 8 is converted by the symbol generator 9 into a predetermined symbol pattern, for example, a dot matrix corresponding to a sequence circuit symbol. This dot matrix is further read out to the display control unit 10, and
The display unit 1 is synchronized with the raster scan of the display unit 11.
1, a predetermined symbol will be displayed.

Note that the contents of the program stored in advance in the storage section 3 are specified by input from the sequence input section 12. The above-mentioned designation input consists of a command section for designating a predetermined operation and an input/output number to be the target of the command, and is performed by key-in operation on a typewriter or the like.

The electronic sequence control device described above can display the program contents stored in the storage unit as an image in which symbols of input and output information are connected to each other as shown in the sequence diagram. There is an advantage that confirmation can be performed without a developed diagram.

However, when displaying the program contents of the electronic sequence control device described above, the width of the display section is limited, so there is a drawback that only a very limited number of the program contents can be displayed out of all the program contents.

In addition, when testing or inspecting a controlled system, it is common to always bring a developed diagram and check the operating status of external equipment by comparing it with the above-mentioned diagram. Since the display unit described above is fixed, it is impossible to check the operating status of the external device after viewing the displayed content. Therefore, in such a case, there is a drawback that it is necessary to carry out the check using a prepared development diagram.

[Purpose of invention]

The purpose of the present invention is to eliminate the drawbacks of the prior art described above, and to
It is an object of the present invention to provide an electronic sequence control device in which all program contents are printed and displayed at the same time using predetermined symbols and in the form of a developed diagram showing the flow of a sequence.

[Summary of the idea]

In order to achieve the above object, the present invention has developed input/output information that is determined corresponding to the symbol indicating the input/output information shown in the developed diagram, and the connection relationship of this input/output information, for example, each of the input information is parallel to each other. , or a series or series/parallel connection relationship is represented by a predetermined symbol, and connection information determined corresponding to this symbol is stored in the storage unit of the electronic sequence control device. When reading each of the information stored in the storage section, each symbol indicating the input/output information is printed, and the input/output information is read out by a symbol determined corresponding to the connection information. a sequence display section that prints out a symbol in such a way that the connection relationship between the symbols is clearly displayed; the sequence display section includes a decoder that determines whether content read from the storage section is input/output information or connection information;
A means for printing input/output numbers in the case of input/output information, a means for printing symbols indicating the connection of input/output numbers in the case of connection information, a column counter that counts up in the case of input/output information, and a means for printing the column number of the connection information and the column counter. It is composed of a comparator that compares the values and, if the column counter value is small, prints a print pattern of spaces until they match.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 3 is a block diagram showing an electronic sequence control device according to the present invention. Items having the same reference numerals as those in FIG. 2 have the same functions, and only the differences will be explained.

The sequence input unit 6 has a function that, when a key is entered using a typewriter or the like provided in the sequence input unit 6 while looking at the relay development diagram, the contents are stored in the storage unit 3 as a sequence command. It is something. Further, the sequence display section 7 has a function of printing the sequence commands stored in the storage section 3 in a form in which input and output symbols are connected to each other, as in a relay development diagram.

Before giving a detailed explanation of the embodiment of the present invention, the characteristics of the developed relay diagram will be shown, and programming using these characteristics will be explained.

A developed diagram is a diagram that uses predetermined symbols to show, for example, the connection state between multiple relay contacts and a relay coil, and as shown in Figure 4, the diagram shows the flow of signals when relay contacts are connected in series. It consists of a horizontal line showing the signal flow and a vertical line showing the signal flow when the relay contacts are connected in parallel. Therefore, the relay development diagram should be prepared in advance.
On a drawing that has horizontal lines (rows) and vertical lines (columns), it is possible to draw according to the horizontal lines and vertical lines.

In Fig. 4, horizontal lines and vertical lines indicating horizontal connections and vertical connections in the relay development diagram are represented by row lines and column lines, respectively, and connection points (the following are referred to as branching points in the example) in the relay development diagram. (this means the point where the signal branches) are the lines a, b,
It shall be shown at the point where c,... and the column lines a', b', c',... intersect. Furthermore, the signal flow in the relay development diagram shown in FIG. 4 is defined as left to right and top to bottom.

The symbol 〓 shown in FIG. 4 represents the a contact of the relay, the symbol 〓 represents the b contact of the relay, and the symbol 〓 represents the relay coil. shown above each signal
X001, X002, X003, X004, and Y001 indicate input/output numbers assigned to input/output devices, where X represents an input device and Y represents an output device. Since the signal flows in the relay development diagram shown in FIG. 4 are from left to right and from top to bottom, the shapes of signal flows at branch points can be summarized into three.

a The signal continues down and to the right b The signal continues down and does not continue to the right c The signal continues to the right and does not continue down Key-in shall be performed according to the regulations.

1 Key in the input/output number as is. However, the symbol 〓 indicates a b contact, so when inputting/output keying in, add the symbol / in front of it.

For the output point y, key in ( as a symbol indicating the output.

2 Key in at the branch point a Key in the + sign at the branch point where the signal continues down and to the right.

b At branch points where the signal continues downward but does not continue to the right, key in the symbol '.

c At the branch point where the signal continues to the right and does not continue down, key in the symbol.

3 The key-in order is from left to right, and when the key-in of one line is completed, the key-in of the next line is performed. Key in SP in the row where there is no relay contact. Here, keying in SP is called column feeding.

If the relay development diagram of FIG. 4 is keyed in according to the above regulations, the contents will be as shown in FIG. 5.

When the key-in shown in FIG. 5 is performed from the sequence input section 6, the sequence program for the relay development diagram shown in FIG. 4 is stored in the storage section, and at the same time, the sequence program shown in FIG. The program is printed in the form

FIG. 6 is a block diagram showing the internal structure of the sequence input section 6 shown in FIG. Based on FIG. 5, a description will be given of how keyed-in information is stored in the storage unit 3 as a sequence command.
The format of the sequence instructions stored in the storage unit 3 is shown in FIG. A decoder 9 determines whether the input information from the keyboard 8 is an input/output command, a connection command (hereinafter referred to as a branch command in this embodiment), or a column feed. If it is an input/output command, it is stored in the storage unit 3 in the format shown in the input/output command format shown in FIG. 7a, and the column counter 10 is incremented by one. If the input information from the keyboard 8 is a branch instruction, the value of the column counter 10 at that time becomes the column number designation, and is stored in the storage unit 3 in the format shown in the branch instruction format shown in FIG. 7b. SP is column forwarding, only the column counter 10 is updated, and it is not stored in the storage unit 3. column counter 1
0 is cleared to 0 after the branch instruction ' is keyed in, and is counted again when the next line is keyed in.

Next, an explanation will be given of the operation from when the sequence command stored in the storage unit 3 is read out to when a connected form of the sequence is printed by the input/output typewriter.

FIG. 8 is a block diagram showing the internal configuration of the sequence display section 7. As shown in FIG. The decoder 12 determines whether the sequence instruction read from the storage unit 3 is an input/output instruction or a branch instruction. If it is an input/output instruction,
A print pattern, an example of which is shown in FIG. 9, is created in the print pattern creation section 13, and printed on the print section 15 according to a command from the print command section 14. At the same time, the column counter 16 is counted up by +1. If the decoder output is a branch instruction, the print instruction section 14 prints the branch on the printing section 15 .
Here, + and ′ in the branch instruction mean that the signal continues from the current line to the line below in that column, and branch instruction ・ means that the signal continues from the current line to the line below in that column. means that the signal does not continue, so that information is stored in the column register 17. That is, the column register 17 is a register having the same number of storage bits as the number of columns in the relay development diagram shown in FIG. 4, and the number of each storage bit corresponds one-to-one with the column number. If the branch instruction is + or ', set 1 to the bit in the column register 17 with the same number as the column number specification in the branch instruction, and if the branch instruction is -, set the column number in the branch instruction to 1. Clears the bit in column register 17 with the same number as the specified one.

Next, in the case of the branch instruction ', after performing the above processing, the printing section 15 is caused to return and line feed, and the line printing section 18 prints out a line indicating the vertical connection of the sequence. The line print creation unit 18 includes a column register 17 that stores the branch state of the previous line.
Read the contents of , and create a print pattern that prints in the column where 1 is written. Print command section 1
4 causes the printing unit 15 to print this printing pattern, returns and returns the line after printing is completed, and waits to print the next line. When a branch instruction is read from the storage unit 3, the column number in the branch instruction and the value of the column counter are always compared in the comparator 19, and if the value of the column counter is smaller than the column number in the branch instruction, If there is, the print pattern creation unit 13 is instructed to create a SP print pattern, and the print pattern created by the print pattern creation unit 13 with a space corresponding to the column length is printed on the print unit 15 by the print command unit 14. be done. This operation is repeated until the column counter value and column number match. Through the operations described above, the sequence commands read from the storage section 3 are printed by the sequence display section 7 in the form of horizontal and vertical sequences as shown in FIG.

The operation of the sequence input section and the operation of the sequence display section have been explained separately above for convenience, but the keyboard 8
When the relay development diagram is keyed in, the sequence input section 6 and the sequence display section 7 perform a series of operations.

That is, when one input/output number or a branch is keyed in, it is translated into a sequence command by the sequence input unit 6 and stored in the storage unit 3, and at the same time, the stored sequence command is printed out by the sequence display unit 7. Ru. For example, if you key in one input/output number, the print pattern shown in FIG.
With this key-in of one character, the printing section prints ', then carries out a carriage return line feed, prints a line indicating vertical connection, and when the printing of the line ends, carries out a carriage return line feed to the next line, and has the next key-in. In the process of keying in in this way, the sequences up to that point are printed in a connected form. Furthermore, the contents once stored in the storage section 3 are printed out continuously in a connected sequence by the aforementioned sequence display section 7.

As explained above, according to the electronic sequence control device according to the embodiment of the present invention, there is no restriction on the shape of the relay development diagram seen in the conventional relay development diagram method, and horizontal connections and vertical connections can be expanded as many times as desired. This makes it easy to create the first relay development diagram, and programming can be done directly by key-in while looking at the relay development diagram, and as you key in, the previous sequences are connected. Since the sequence is printed out, there is no need to make a mistake when keying in. Also, once the sequence is stored in the memory, it is printed out in the same way as the relay development diagram that was keyed in whenever necessary, so the sequence can be easily stored. Easy to confirm.

Moreover, the contents once stored in the storage section can be read out (printed) at any time as needed. Furthermore, since the read content is in the form of a relay development drawing, there is an advantage that the drawing can be obtained at any time. For example, when checking the operating status of external input/output equipment, it is generally done while looking at a relay development diagram, but with this invention, there is no need to bring a standing diagram with you at all times. , there is a great advantage that the drawing can be obtained immediately from the sequence display section of this device.

[Effect of idea]

As described above, according to the present invention, the results of reading the program contents are printed and displayed in a connected form such as a relay development diagram, so that the printed matter can be used as it is in place of a drawing.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a relay development diagram, Fig. 2 is a block diagram of an electronic sequence control device, Fig. 3 is a block diagram of a sequence control device according to the present invention, and Fig. 4 is a diagram showing a relay according to the present invention. FIG. 5 is a diagram showing an example of key-in contents from the keyboard; FIG. 6 is a block diagram of the sequence input section; FIG. 7 is a diagram showing the format of sequence commands; FIG. is a block diagram of the sequence display section, Figure 9 is a diagram showing the printing pattern, and Figure 10 is a diagram showing the printing pattern.
The figure is a diagram showing an example of a relay sequence printed by the sequence display section. 1...Input section, 2...Output section, 3...Storage section,
4...Control section, 5...Calculation section, 6...Sequence input section, 7...Sequence display section.

Claims (1)

[Scope of utility model registration request] An input section that introduces an input signal from an external device, a calculation section that calculates the input signal, a storage section that stores program contents in advance, and a calculation section that processes the input signal according to the program read from the storage section. a control section for deriving the results to the processing section; an output section for introducing the results of calculation processing by the arithmetic section and controlling an external device using the output signal; and an input/output number for input/output information and connection information. a sequence input section that stores symbols indicating connections between them in the storage section; and a sequence display section that prints and displays input/output information and connection information stored in the storage section; A decoder that determines whether the content read from the section is input/output information with input/output type and number specified or connection information with branch type and column number specified.If it is input/output information, it prints the input/output number and connects. In the case of information, a means of printing symbols indicating the connection between input and output numbers,
It consists of a column counter that counts up in the case of input/output information, a comparator that compares the column number of the connection information and the value of the column counter, and if the value of the column counter is small, prints a print pattern of spaces until they match. An electronic sequence control device featuring: