JPH0693205B2 - Sequence controller program input method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a program input method for a programmable sequence controller.

[Conventional technology]

Currently, ladder graphic input and mnemonic language input are commonly used as program input methods for sequence controllers.

Ladder graphic input is a method of placing symbols directly on the screen in an interactive form, and has the advantage that anyone who understands the sequence diagram can use it immediately and can create circuits in any format.

Also, since the mnemonic language input is programmed by a logical expression, it can be input without being aware of the screen if a certain law is memorized. Therefore, it has an advantage that the program can be executed at high speed.

[Problems to be solved by the invention]

However, in the case of ladder graphic input, it is necessary to confirm the screen display for setting the position because the programming is done while deciding the position of the symbol. Moreover, since there are many keystrokes, there is the disadvantage that programming takes time. is doing. On the other hand, in the case of mnemonic language input, there is a point that you have to remember the logic method even though it is easy, and there is a concept of block sum and block product of circuits, and "circuit, circuit, and block" or "circuit,
Since it becomes an order input of "circuit, OR block", it cannot be converted into a graphic until the completion of one circuit preparation, and there is a drawback that the graphic cannot be confirmed while writing.

[Means for solving problems]

The present invention has been made in view of the above problems, and a first instruction that creates a contact at a circuit start line regardless of the position of a symbol arrangement start point and sets the rear side as a next symbol arrangement start point, 2nd instruction that creates a contact at the symbol placement start point of the next symbol and the subsequent side is the next symbol placement start point, and creates an OR circuit from the circuit start line to the current symbol placement start point A third instruction that is the arrangement start point and a branch line that divides into two at the current symbol arrangement start point when there is no pointer storage, and the branch side of one branch is set as the next symbol arrangement start point When the created position is stored in the pointer and the pointer is already stored, the branch line at the position indicated by the pointer storage is placed behind the branch not yet the symbol arrangement start point. The fourth instruction for transitioning the start point of the arrangement of the balls, the fifth instruction for creating a connecting line connecting the ends of the two branched systems, and the subsequent side as the starting point of the next symbol arrangement, and the current symbol The sixth instruction for changing the contact point immediately before the arrangement start point to the negative contact point, and creating the output point at the current symbol arrangement start point and deleting the pointer storage by the fourth instruction if there is any The program is input by using the seventh instruction for transitioning to the incomplete portion.

Note that FIG. 1 is a symbolic representation of the above seven types of instructions, and FIGS. 1 (a) to (g) correspond to the first to seventh instructions, respectively. In the following description, for convenience,
Set the symbols and names of instructions as follows.

[Operation] When a circuit element is input using the command of the present invention, its position is immediately defined at the time of input.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 2 shows an example of a ladder circuit to be created, and the creation procedure according to the present invention will be described in comparison with the creation procedure in the mnemonic language.

First, the procedure when using the mnemonic language is shown.
According to the mnemonic language, it is LD A LD B ORI D ANB AND C OUT E. Since the mnemonic language is a known language, a detailed description of its instructions will be omitted here. Here, as a reminder, in the mnemonic language "L
The definitions of “D” and “LD”, which is one of the instructions of the present invention, are different.

The problem of the block product of the mnemonic language mentioned above is
When inputting "LD B", it is not clear whether contact B is below contact A or next to contact A. Therefore, a sequence instruction called block product (ANB) is required.

On the other hand, according to the input method of the present invention, the ladder circuit of FIG. 2 becomes LD A PH JNC B PH JNC NOT D RPH JNC C OUT E. FIGS. 3 (a) to 3 (h) show a process in which a ladder circuit is formed by the input procedure of (1) to (3). The part indicated by the broken line in FIGS. 3B and 3D indicates the next symbol arrangement start point in the instruction PH (path).

PH not only forms a branch line, but also stores its position as a pointer.
The PH causes the symbol placement start point to transition to the rest of this branch line, and the location of the negative contact D is defined.

FIG. 4 shows another example of the ladder circuit to be created. If you write this ladder circuit in a mnemonic language, it will look like LD A LD C AND D ORB OUT B. In this example, it is not possible to specify one layout position when inputting "LD C". In addition, it is not decided whether the input will be OR or LD unless one or more contacts are first determined in the OR circuit.

On the other hand, when this ladder circuit is input by the input method of the present invention, it becomes LD A LD C JNC D RPH OUT B. FIGS. 5A to 5E show the process in which the ladder circuit is formed by the input procedure of to. In the case of this example, according to the input method of the present invention, "LD" is clearly distinguished from "JNC" no matter how many contacts are inserted in the OR circuit, so that the arrangement position is specified at the time of input.

FIG. 6 shows still another example of the ladder circuit to be created. When this ladder circuit is written by the input method of the present invention, it becomes LD A PH JNC B OUT C JNC D OUT E. FIGS. 7 (a) to 7 (f) show the process in which the ladder circuit is formed by the input procedure of (1), and as is clear from FIG. Its position is clearly defined.

〔The invention's effect〕

As described above, according to the program input method of the sequence controller of the present invention, graphic programming can be logically performed. Moreover, the number of keystrokes is almost the same as the number of keystrokes for mnemonic language input, and high-speed input is possible. Also, the logic rules are extremely simple and easier for beginners to remember and accept than mnemonic languages. Furthermore, although it is a logic, it is not necessary to be aware of the block circuit unlike the mnemonic language, and since the symbol input position is determined when one instruction is input, it is possible to use the mnemonic language input that allows programming while checking the CRT display. Not have great advantages.

[Brief description of drawings]

FIG. 1 is a diagram showing symbols of basic instructions in the programming system of the present invention, FIG. 2 is a diagram showing an example of a ladder circuit to be programmed, and FIG. 3 is a diagram showing the ladder circuit of FIG. Fig. 4 is a diagram showing a procedure for making the ladder circuit, Fig. 4 is a diagram showing another example of the ladder circuit to be programmed, and Fig. 5 is a procedure for making the ladder circuit of Fig. 4 by the programming method of the present invention. FIG. 6, FIG. 6 is a diagram showing still another example of the ladder circuit to be programmed, and FIG. 7 is a diagram showing a procedure for producing the ladder circuit of FIG. 6 by the programming method of the present invention. .

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-61-187008 (JP, A) JP-A-61-29907 (JP, A) JP-A-60-41102 (JP, A) JP-A-54- 72384 (JP, A)

Claims (1)

[Claims] 1. In a sequence controller for executing sequence control according to a sequence circuit created by program input, a contact is made at a circuit start line regardless of the position of the symbol placement start point, and the subsequent side is the next symbol placement start point. And a second instruction that creates a contact at the current symbol placement start point and uses the rear side as the next symbol placement start point, and an OR circuit from the circuit start line to the current symbol placement start point. A third instruction that is created and uses the subsequent side as the next symbol placement start point, and a branch line that divides into two at the current symbol placement start point when there is no pointer storage and the rear side of one branch is the next symbol placement The pointer is stored as the starting point and the branch line creation position. If the pointer is already stored, the pointer is stored. Connects the 4th instruction that transitions the symbol placement start point to the rear side of the branch that is not yet the symbol placement start point of the branch line at the position indicated by the memory, and each end of the two branches A fifth instruction that creates a tie line and uses the rear side as the next symbol placement start point, a sixth instruction that changes the contact point immediately before the current symbol placement start point to a negative contact point, and outputs at the current symbol placement start point A sequence controller characterized in that a program is input using a seventh instruction that creates a point and erases the pointer storage by the fourth instruction, if any, and transitions the symbol arrangement start point to an incomplete portion. Program input method.