JPS62224805A - Ladder diagram display system for program of sequence programmable controller - Google Patents

Abstract

PURPOSE:To reduce switching of a picture and improve efficiency of operation by displaying a ladder diagram of other relay including an element that controls on/off of the relay. CONSTITUTION:A command that indicates to display the ladder diagram of a relay in order of a program is inputted from a keyboard 4. Then, a program stored in a memory 3' is read and the following operation is executed. First, an address AAAA is accessed and picture image data of the coil of a relay A stored in a small area 2 of an area ARA that makes AAAA a forefront address are read out and a ladder diagram of the coil of the relay A is displayed on the display face of a CRT 5 for display. Thus, ladder diagrams of other coils not shown in the figure and coils of relays B, C etc. are displayed as far as the size of the display face permits.

Description

[Detailed Description of the Invention] [Summary] When a ladder diagram of a program of a sequence programmable controller is displayed, each relay that controls the sequence is controlled to be turned on or off in succession to the ladder diagram of the relay. The ladder diagrams of other relays (generally there are multiple) containing the element are displayed close together on the same screen, for example, so that they can be displayed on the screen when debugging programs or diagnosing problems during system operation. This eliminates the need for switching operations and simplifies operation.

[Industrial application field]

The ladder diagram display method of the program of the hash sequence programmable controller of the present invention, more specifically, the ladder diagram of another relay containing an element that controls the on/off of the relay is displayed in succession in one ladder diagram display. This invention relates to a ladder diagram display method for a program of a sequence programmable controller.

[Conventional technology]

The program for the programmable controller is programmed in a special language using a ladder diagram representing a relay circuit, using a numerical control device or a dedicated programming device. Numerical control devices and dedicated programming devices can reversely CR the ladder diagram from the input program 2m.
It can be displayed on the T display screen. Conventionally, this CR
On the T display screen, only a ladder diagram was displayed in the order of input commands.

This will be explained in more detail using figures.

FIG. 4 shows a ladder diagram of the above program displayed in the programmed order according to the prior art.

In the figure, A, B, C, D..., etc. are the coils of relays A, B, C, D..., respectively, and sl, a
2, El, Gl, HL are relays E, E,
CI represents the operating contacts included in G, H, etc., and the stationary contact included in relay C. These contacts are relays A and B
, C, D, etc. are elements that control the on/off state of the coils. A', B', C', and D' are signals generated when relays A, B, C, and D operate, respectively.

In this case, depending on the program, relays A, D...B...
・C operates in the order shown in the drawing to generate signals A', D'...B
'...CI... is generated and the sequence is controlled.

In the above, when a ladder diagram is displayed for the coil of Relay A, the ladder diagrams for the coils of Relay D, Relay B, and Relay D are displayed sequentially in accordance with the program order. . At this time, since the size of the display screen is limited, only two to four ladder diagrams can be displayed on one screen.

[Problem that the invention seeks to solve]

In the sequential ladder diagram display method of the conventional program described above, when there are many conditions (relays) that turn one relay on and off, it becomes necessary to switch screens in order to see the status of each of these conditions. It is difficult to view many conditions at the same time on one screen, and there is little information that can be viewed on one screen. There is a problem in that the frequency of switching is high, the operation becomes troublesome, and it may not be effective.

To explain FIG. 4 in more detail, the elements Bl, cl that determine the state (operation or non-operation) of relay A
The ladder diagrams of Relay B and Relay C, including the above, are located far away from the ladder diagram of Relay A in Figure 4, and in order to display them on the same screen, it is necessary to switch screens, which makes the operation cumbersome. becomes.

The present invention displays relay ladder diagrams including elements that determine the state of one relay A in succession and close to the ladder diagram of one relay, for example, relay A1, so that, for example, the plurality of ladder diagrams described above are displayed in the same manner. The purpose of this is to reduce the number of screen changes and to simplify operations.

[Means for solving problems]

According to the present invention, a processor, a memory and a display CR
and a display device for displaying on the display CRT' (based on image data stored in the memory); Regarding the relay, image data for displaying a ladder diagram of the relay, and image data for displaying the ladder diagram of other relays including elements for controlling on/off of the relay are stored in an area related to the storage area of the image data. By storing the data specifying the address of the relay, and displaying the ladder diagram of one relay, the ladder diagram of another relay including the element for controlling the on/off of the relay is displayed based on the address. The above problems can be solved and the above objectives can be achieved.

[For production]

To display the ladder diagram of the program of the sequence programmable controller, for each relay that controls the sequence, display the ladder diagram of other relays (generally there are multiple) that include elements that control the on/off of the relay, as well as the ladder diagram of the above relay. It is displayed in a narrow area, for example on the same screen, in close proximity to the diagram, making it clear at a glance whether the connection of the above relay is correct or not, and is displayed when debugging a program or diagnosing a problem during system operation. This greatly reduces the frequency of screen switching operations.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a portion related to ladder diagram display of a program controller embodying the present invention. In the figure, 1 is a processor (CPU), 2 is a read-only memory (ROM), 3 is a memory (MgM), and 4
5 is a keyboard (KB), 5 is a display CRT, 6 is a control device for the display CRT 5, and 7 is a bus connecting the above devices. As a sequence programmable controller, an interface device and a programming device between the processing system and the device that controls the sequence as shown in FIG. 1 are required, but these are not relevant to the understanding of the present invention, so FIG. is omitted.

In the figure, a program with the contents shown in FIG. 2 is stored in the memory 2. FIG. 2 is a diagram showing the contents of a program used in the present invention.

In Figure 2, ARA,...A7? B...ARo are areas of the memory 2 that store information regarding relays A, B, and C, respectively. Each of these areas is further divided into subareas 1, 2, and 3, and subarea 1 contains programs that operate the coils of relays A, B, and C, and subarea 2 contains programs that operate relays A, B, C, etc. Image data for displaying a ladder diagram of the coil is further stored in a small area 3 as data specifying addresses where information on other relays including elements that determine the status of relays A, B, C, etc. is stored. (ARh, ARm, A&), etc.) is stored. AAAA in the figure
, BBBB, CCCC, etc. are the areas ARAARa AR
This is the first address of a, etc.

□□□) When performing sequence control, a command instructing execution of sequence control is input from the keyboard 4 in FIG. Then, the management program in the read-only memory 2 reads the program shown in FIG. 2 stored in the memory 3, and executes the following operations.

First, a program for operating relay A stored in small area 1 of area ARA with AAAA as the top address is read out, relay A is operated, and signal A' (see FIG. 4) is sent out. When the execution of this program is completed and relay A is restored, the program goes to the next program, that is, the next address DDDD (not shown), operates relay D, sends signal D', and executes the program. In this way...Relay B.

...Sequentially execute a program that operates relay C... to generate signals A/, vl...B'...C'...
are generated sequentially to perform sequence control.

(6) In the case of the conventional display method, that is, when displaying the relay ladder diagram in the order of the program, in Figure 1, enter a command from the keyboard 4 to instruct the display of the relay ladder diagram in the order of the program. do. Then, in the same manner as in case (α) above, the program having the contents shown in FIG. 2 stored in memory 3 is read and the following operations are executed.

First, address AAAA is accessed, image data of the coil of relay A stored in small area 2 of area ARA with AAAA as the first address is read out, and the image data of the coil of relay A is read out.
A 2-g diagram of the coil of relay A is displayed on the display screen of s (Fig. 1).

Similarly, a ladder diagram is displayed regarding the coil K of the relay D (not clearly shown in FIG. 2) stored at the next position in the program.

In this way, as much as the display screen size allows, the series A,
Ladder diagrams of coils of other relays (not shown) and coils of relays B, C, etc. are displayed from the coil D. At this time, the coils are displayed in the order of the program. 3) show the display state of the display surface in this case, but this is a conventional display and is the same as FIG. 4.

In this case, when focusing on relay A, relays B and C that control the on/off of the coil of relay A are programmed as follows:
Because they are located far apart, it is not possible to display the ladder diagram of relay A's coil and the ladder diagrams of relays B and C on the same screen, so when checking the circuit of relay A's coil, it is not possible to display the ladder diagram of relay A's coil and the ladder diagram of relay B and C's coils on the same screen. It is necessary to change the screen.

(c) In the case of a display according to the present invention, that is, when a ladder diagram of one relay and a ladder diagram of another relay including elements for controlling on/off of the relay are displayed consecutively on the same display screen, the above-mentioned A command for instructing display is input from the keyboard 4. Then, in the same manner as in the cases of ((L) and (6)), the program of the contents shown in FIG. 2 stored in the memory 3 is read and the following operations are executed.

First, if relay A is specified with the above command, address AAAA is accessed, and image data of the coil of relay A stored in small area 2 of area uA with A'AAA as the first address is read out and displayed on the CRT ( A ladder diagram of the coil of relay A is displayed on the display screen 5) in FIG. In this case, the coil of relay A is
As shown in figure (cL), element Bl (
operating contact) and element CI included in relay C (stationary contact)
Therefore, in small area 3 of area ARh, the start addresses BEBB and c of areas ARB and AR, which store information about relays B and C, are
ccc is stored. In this case, the address of the area (small area 2) where image data for displaying the ladder diagram of other relays including the element for on/off control of relay A is stored can be specified from the address data BBBB and CCCC.

After displaying the ladder diagram of the coil of relay A, read the start address BBBE of the area ARB that stores information about relay B from the small area 3 of 18 people, and based on this, read the start address BBBE of the area ARB that stores information about relay B. , read out the image data regarding the circuit of the coil of relay B stored in the small area 2, and display the ladder diagram of the coil on the display screen of the display Cn5, following the ladder diagram of the coil of relay A. indicate.

After that, in the same way as above, read the start address CCCC of the area ARa that stores information about the relay C, and based on this, access the small area 2 of the area ARc3 and relay the information stored in the small area 2. The image data regarding the circuit of the coil of relay C is read out and the ladder diagram of the coil of relay C is displayed for display (displaying the ladder diagram of the coils of relay A and relay B consecutively on the display screen of JT'5. In this way, In proximity to the coil ladder diagram of relay A, ladder diagrams of other relays (B, C) including elements for controlling on/off of relay A can be displayed on the same screen.

FIG. 3 shows the display of a ladder diagram in the order of the conventional relay programs [(b) above] and the display of one or more relays including elements for on/off control of a particular relay according to the present invention. FIG. 6 is a diagram for comparing and explaining displaying the ladder diagram and the ladder diagram of the specific relay on the same screen [above (C)]. FIG. 3(a) shows the above display [(b)], and FIG. 3(b) shows the latter display [(C)].

According to the present invention, as shown in FIG. 3(6), the ladder diagram of relay A and the ladder diagrams of relays B and C including elements for turning on and off relay A can be displayed on the same screen (
(indicated by a dotted line).

As can be easily seen from Figure 2, after displaying the ladder diagram of relays B and C, relay A
A ladder diagram of relays G and H that are indirectly related to can be displayed. That is, image data of related relays can be extracted continuously in a tree shape from one relay.

If you want to obtain information about a relay different from relay A, enter the information specifying the required relay and the above command from the keyboard 4.
Similarly, the ladder diagram of the required relay and the ladder diagram of the relay including elements for controlling the on/off of the required relay can be displayed consecutively on the same screen.

〔Effect of the invention〕

Since the present invention is configured as described above, in the sequence programmaple controller program,
With one coil (such as a relay) as a reference, the circuit of the relay coil that is in the ladder diagram and includes the elements (contacts) that control the on/off of the coil is the ladder diagram of the coil with the above reference as the reference. Since the ladder diagram can be displayed on the same screen, there is no need to switch screens when debugging a program or diagnosing a fault during system operation, and the operation becomes simple and easy.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the part related to ladder diagram display of a program controller implementing the present invention, FIG. 2 is a diagram showing the contents of a program used in the present invention, and FIG. 5 is a diagram of a display CRT according to the present invention. FIG. 4 is a diagram showing a ladder diagram display in the order of programs according to the prior art. DESCRIPTION OF SYMBOLS 1...Processor 2...Read-only memory 3...Memory 4...Keyboard 5...Display CRT 6...Display CRT control device 7...Paths A, B, C, D...etc...Relays A, B, C, D.
Coils Bl, B2, cl, Gl, Hl, etc.
, contacts A', E' of relays E, C, II, H, etc.
C'...Signal patent applicant Fanuc Co., Ltd. agent Patent attorney Gobe Tamamushi (2 others) This invention t! Block diagram of the part related to the ladder diagram display of the implemented program controller No. 10 Contents Area ηThis invention j
;Contents of the program to be usedE9 Figure 2 shows the same as the conventional 6 Invention of the present invention (
G) (b) Figure 3 showing the diagram display on the display surface of the display CRT in the present invention

Claims (1)

[Scope of Claims] A display device including a processor, a memory, a display CRT, and a CRT control device, and displays on the display CRT based on image data stored in the memory, and a sequence programmable device in the memory. Image data for displaying a ladder diagram of each relay that controls the sequence in the controller program, and ladder diagrams of other relays that include elements for controlling on/off of the relay in an area related to the storage area of the image data. Stores data specifying the address where the image data for display is stored, and continuously displays the ladder diagram of one relay, and based on the address, displays other relays including elements that control on/off of the relay. A ladder diagram display method for a program of a sequence programmable controller characterized by displaying a ladder diagram.