JPS59214908A - Display system of ladder diagram - Google Patents

Abstract

PURPOSE:To retrieve a ladder diagram easily by displaying the picture number of a relay coil in a ladder diagram close to a relay contact. CONSTITUTION:A numerical control device 1 reads a working command from a paper tape 101a and transmits/receives data between the device 1 and a sequence controller 2. The controller 2 executes sequence processing on the basis of each instruction of a sequence program and transmits/receives data between the controller 2 and a working machine 3. The ladder diagrams and messages of the sequence program are displayed on a display device 101i. In the display, picture numbers are successively assigned from the head of the sequence program and the picture number (e.g. AAAA) is displayed. In a relay contact in the displayed ladder, the picture number of a relay coil corresponding to the contact is displayed under the relay contact.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a ladder diagram display method for displaying a sequence program of a programmable controller on a display screen in the form of a ladder diagram, and in particular to a screen of a relay coil corresponding to a relay contact. Related to a Ladder Diagram Display Method That Can Easily Understand 0 In prior art numerical control systems, each mechanical element in a machine tool is controlled based on commands from a numerical control device (including an operation panel). By the way, in such numerical control systems, conventionally, a strong electric circuit consisting of a group of many relays is interposed between the numerical control device (hereinafter referred to as the NC device) side and the machine side.
A predetermined relay is operated by an NC command (M function command, 8 function command, command from the operation panel, etc.), and the corresponding NC is thereby activated.
It made mechanical elements perform actions according to commands.

However, in such conventional systems, the device becomes large and requires a large number of relays, resulting in high costs, and furthermore, reliability is lowered due to malfunction of the relays.

Therefore, a system in which the functions of such high-power circuits are performed by a sequence controller (programmable sequence controller) based on program processing has become mainstream.

In such a programmable controller, a sequence program is stored in a memory, and a processor executes the sequence program to perform sequence control of the machine. On the other hand, this programmable controller is provided with a display device such as a CRT (cathode ray tube), on which ladder diagrams, messages, etc. of the sequence program in the memory are displayed.

A sequence program for sequence control is a logical program of the functions of a high-voltage circuit using instruction codes. For example, the ladder diagram of a part of a high-voltage circuit shown by relay contacts and relay coils shown in Figure 1 is , is programmed as shown in Figure 2. Note that RD in the sequence program.

AND, WRT, OR,, 0RNOT, etc. are instruction codes respectively, RD is a read instruction, AND is a logical product operation instruction, WRT is a write instruction, OR is a logical sum operation instruction, 0R
NOT is an OR instruction with a negative value. 10.0°2[10,1... is the address (predetermined location, predetermined bit) on the data memory where the instruction code is executed. By executing the instruction group of this sequence program, (a-b
)+c logical operation is executed, and the operation result (11w or IO
') is stored in the first bit of address 210 of the data memory.

To describe this in terms of the operation of a high-voltage circuit, relay contacts a, b,
This means that relay coil d is excited depending on the state of contact point c.

Such a sequence program is displayed on a display device as a relay contact coil of a high-voltage circuit as shown in FIG. 1, so that the operating conditions can be easily understood. Therefore, displaying the ladder diagram of the sequence program on a display device when investigating a fault is convenient for understanding the location of the fault.

In recent years, this sequence program has become sophisticated and complex. For example, in the control of NC machine tools, ATC (
Controls such as automatic tool change) and APC (automatic parts change) are also controlled by sequence programs. When a sequence program becomes complicated in this way, there is a limit to the amount of programs that can be displayed on the screen of a display device, so several dozen screens are required to display all the sequence programs.

On the other hand, there are relay coils that correspond to relay contacts a, b, and c, and the operation of the relay coils is controlled by another relay contact. It is necessary to follow the operating conditions of the corresponding relay coil.

Therefore, if the sequence program is complex and large in size as mentioned above, and it becomes impossible to display all of them on one screen, it is necessary to display all the screens sequentially and search for the corresponding relay coil, which requires a lot of time and effort. There is a drawback that it takes
Particularly when searching for a fault, it takes a long time to figure out the cause, resulting in a situation where the operator is forced to spend a considerable amount of time and effort.

OBJECTS OF THE INVENTION An object of the present invention is to provide a ladder diagram display method that allows the display of relay coils corresponding to relay contacts in a displayed ladder diagram to be easily grasped and selected.

SUMMARY OF THE INVENTION The present invention includes a memory for storing a sequence program 2 and a display device for displaying the sequence program 2 in the form of a ladder diagram in combination with one +J point and a relay coil. A series of screen numbers are attached to each range of sequence programs that can be displayed on the screen of the display device, and the screen number included in the relay coil corresponding to the relay contact in the ladder diagram is attached near the relay contact. I am trying to display it.

That is, in the present invention, the relationship between the relay contacts existing in a huge program and the corresponding relay coils is associated with the screen number attached to each display screen, and this is displayed together with the relay contacts, and the corresponding relay coils are associated with each other. - Makes it easy to search for coils.

Example Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 6 is a block diagram of one embodiment of the programmable sequence controller (hereinafter referred to as PC) of the present invention.

In the figure, 1 is an NC device, 2 is a separate PC installed separately from the NC device, and 3 is a machine tool.

In the numerical control device 1, 101a is a paper tape with machining commands perforated therein, 1013' is a paper tape reader that reads these paper tapes, etc., and 101b is a random access memo! that stores the machining commands punched in the machining tape. J (R.A.
M), '101c is a read-only memory (RO) in which a control program for controlling the numerical control device 1 is stored.
M), 101d is a processing unit (CPU) that performs processing according to each command of the machining instruction program or control program;
101e is a transmitting/receiving unit that exchanges data between the sequence controller 2 and N01, such as a direct memory access controller, 101f is an X axis, Y@
a pulse distribution calculation circuit that receives the directional movement amounts Xo, Yo and the feed speed F, executes a known pulse distribution calculation, and outputs the distribution pulses xp, Yp to a servo circuit (not shown);
101g is an address/data bus line. 101h is a manual data input device (MDI), N
It is attached to the operation panel of C1 and is used to input one block of machining command data, for example, when adding or changing machining command data.

1011 is a universal display device that displays the current position of tools and the like. In addition, the display device MDI
may be configured integrally.

On the other hand, in the PC 2, 202a is a random access memory (RAM) that stores the sequence program.

Reference numeral 202b is a data memory that stores each relay in the high-voltage circuit shown in Fig. 1 corresponding to one bit, and expresses its on/off in 11'' or 10M.For example, if automatic mode is commanded from the operation panel, the high-voltage circuit Then v-a (AUT) is turned on, but the PC 2 stores 111 in the 10th 0th bit of the data memory 202b.

202C is a data input/output unit that controls data input and output with the machine tool 6, and 202d is a ROM that stores a control program that controls the sequence controller main body 2.
202e is a processing device that performs predetermined sequence processing according to a control program and a sequence program;
02f is a transmitter/receiver unit that exchanges data with the NC device 1, and 202g is an address/data bus line.

FIG. 4 is a detailed diagram of the data input/output device 202C, where DI is a data input circuit, and receivers R1 to Rn receive signals from various limit switches and relay contacts RC1 to RCn sent from the machine 6 side, and AND gates. timesMtiG+
~Gn, and a decoder DEC that decodes the address signal on the address bus ABUS, opens a predetermined AND gate, and outputs each AND gate output onto the data bus DBUS.
, and is a data output circuit, which includes flip-flops L1 to Lm (which may also be latch circuits) in which the spindle forward rotation signal, spindle reverse rotation signal, etc. output to the machine 3 are stored, and seven flip-flops each.・7
Drivers D0 to Dm are provided corresponding to the zero tubes L1 to Lm, and send output signals of seven lip-flops (FF) to the machine 3, and operate the relays R1 to Rm;
It is provided with a decoder DEC that decodes the address signal on the address bus ABU8 to enable setting/resetting of a predetermined OFF, and also stores the data on the data bus DBUS in a predetermined FF. Note that CBUS is a control signal bus for sending and receiving control signals, and ABU is a control signal bus for sending and receiving control signals.
8 is an address bus, DBUS is a data bus, t11 to t
Cables 1n, z, . . . 72m connect the data input/output section 202C and the machine 3 side to exchange data.

Next, the operation of PC2 will be explained.

Since the sequence program that has already been created is stored in the RAM 202a, the pcPU 202e uses the RAM 202 under the control of the control program in the ROM 202d.
Each instruction of the sequence program is read one by one from a, sequence processing is executed from the first instruction to the last sequence program instruction, and when the last instruction processing is finished, the program returns to the first sequence program instruction, and thereafter. Processing of the sequence program command is repeated cyclically.0 In this state, for example, the main shaft normal rotation command MO is issued from the NC device 1.
3 is commanded and \ is the M function MP and M code signal Mi1.
11'' is stored in the corresponding bit of the address of data memory 2[12b where M12 is to be stored.

Depending on this memory content, the CPU2o2e
A command is given to the transmitter/receiver 202C via g, for example, "1".
' is stored in the 7-lip-flop L1 of the data output circuit Do (FIG. 4) and output to the machine tool 3 via the drives D, . . . mAH. As a result, relay R of the machine tool 6 is turned on, and normal spindle rotation control is executed. and,
If the main shaft rotates in the normal direction, for example, the relay contact C1 will turn on (9 wires 1. , , receiver R+, N and gate G1
, Data No. (spindle normal rotation completion signal is sent via DBOB)
The data is stored in a predetermined pit of the data memory 202b (FIG. 6) via the bus 202g. Thereafter, the sequence program processing is continued, and the NC device 1 is notified of the completion of the spindle normal rotation, and the sequence processing for the spindle normal rotation ends.

The RAM 202c described above may be configured with a ROM (read only memory) that stores a sequence program, or the NC device 1 and PC 2 may be integrated and each part may be shared.

Now, regarding this programmable controller, the universal display device H1o1t has RAM202.
It has the function of displaying the ladder diagram and messages of the C sequence program as shown in FIG.

That is, according to the display command from MDllolh, the processor 101d of NC1 connects the bus 101g to the direct memory access controller 1oie% transmitter/receiver 202f,
Sequentially reads the sequence program from the ROM 202d via the bus 202g and stores it in the RAM 1o1b of the NC1,
The contents stored in the RAM 101b are transferred to the display 1011, a corresponding pattern is generated from the control section of the display 1011, and a ladder diagram corresponding to the sequence program is displayed on the screen of the display 1011 as shown in FIG.

This display shows MD1101 of the sequence program.
It is possible to display a ladder diagram corresponding to the part specified in h or the alarm automatically searched for when a failure occurs.

Now, in the present invention, the correspondence between relay contacts and relay coils is clearly shown in the ladder diagram display.

FIG. 5 is a detailed explanatory diagram of the present invention, and the display 1
011 is displayed on the display screen.

In the present invention, screen numbers are sequentially assigned to each range that can be displayed on one screen of the display from the beginning of the sequence program. Then, the screen number is displayed on the display. For example, [AAAA, J] shown in the upper left of FIGS.

Display as I-BBBB J. Next, for each relay contact in the display ladder, the screen number of the relay coil corresponding to that contact is displayed below (near) the relay contact. In Fig. 5 (A), for relay contact MA in the display ladder,
The screen number "BBBB J" where the relay coil corresponding to the relay contact MA exists is displayed. Therefore, when you want to check the operating conditions of the relay coil of the relay contact MA, enter the screen number "BBBB J" from MDlloli. , the ladder diagram with the corresponding screen number is displayed as shown in Figure 5 CB), and the relay coil M corresponding to the relay contact MA is displayed.
A ladder diagram including A' is displayed, and its operating conditions (relay contact Me, etc.) can be easily understood.

For this reason, a relay coil screen number area is provided in the 0M202d as shown in Figure 6 (A) according to each instruction code of the sequence program shown in Figure 2, and a relay coil corresponding to the sequence program is created separately here. The screen number of is stored in the program. On the other hand, the correspondence between the screen number itself and the step number of the program is as shown in FIG. 6(B) (provided as a table in the RAM 202a).

As another method, in addition to the correspondence table between RAM2Q2aK screen numbers and step numbers, a correspondence triple between each instruction code and the screen number of the relay coil may be provided.

Further, these tables may be provided in the RAM 101b of the NC1.

These tables can be automatically created by the processor 202e from the sequence program in the ROM 202d using an editing program.

When displaying the ladder diagram, the processor 101d of the NC1, in addition to reading the sequence program from the ROM 202d, searches the table in the RAM 202a.
Also read the screen number (and relay coil screen number), R
Store it in AM101b, edit the screen, and display 1
5 (A) or (B) depending on the transfer to 011.
A display like this is obtained.

This screen number is recorded as the page number of the notebook copy when a notebook copy of the ladder diagram on the display 1011 is taken using a separately installed notebook copying device, and is used to record the correspondence between the hard copy drawing and the screen. It's easy.

Next, as a method of assigning screen numbers, the following considerations are taken into consideration for program changes (particularly additions). That is,
As shown in Figure 6, the screen number is divided into multiple numbers (for example, 10
Programs added in between will be assigned an additional screen number (a number between every 10th screen number).

By doing this, the screen numbers of subsequent programs will not deviate, resulting in the following effect.

First, if you have made a hard copy of the ladder diagram before adding the program, the screen numbers will not change, so you do not need to redo all the hard copies, but only need to make a hard copy of the added part. .

Second, the amount of sequence programs is large.
If there are tens of thousands of relay contacts, it is necessary to convert the above-mentioned table every time the screen number shifts due to addition of a program, and to reset the screen number of the relay coil corresponding to the relay contact. For this reason, even if the processor has a high calculation speed, it will take a considerable amount of time (several minutes) and the operability will deteriorate. By using this method to prevent screen numbers from shifting, only the additional programs need to be processed, which can speed up the additional processing.

As described in detail, according to the present invention, a series of screen numbers are assigned from the beginning to each range of a sequence program for one screen, making it easy to search for each screen, and The screen number that includes the relay coil that corresponds to the relay contact is displayed near the relay contact, making it easier to search for ladder diagrams that include the relay coil that corresponds to the relay contact. play. Therefore, when searching for a fault, it is extremely easy to search for the cause of the fault, the cause of the fault can be grasped in a short time, and prompt recovery and repair can be carried out.

Also, the structure of this tank can be easily realized by simply providing a table. Although the present invention has been described with reference to one embodiment, various modifications may be made within the scope of the present invention, and these are not excluded from the scope of the present invention.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an example of a ladder diagram of a high-voltage circuit, Fig. 2 is a program configuration diagram of the ladder diagram in Fig. 1, Fig. 3 is a block diagram of an embodiment of the present invention, and Fig. 4 is an illustration of the configuration of Fig. 3. Main part configuration diagram,
FIG. 5 is an explanatory diagram of a display example of an embodiment of the present invention, and FIG. 6 is a diagram showing the configuration of a correspondence table according to the present invention. In the figure, 1...NC, 2...Programmable controller, 3...Machine tool, 101b, 202a・R
A.M. 202d ROM, 202e = processor,
1o11...display. Patent applicant Fanuc Co., Ltd. Agent Patent attorney Sangai Tsuji (1 person) Figure 1 Figure (A) Figure 5 (β)

Claims (2)

[Claims] (1) It has a memory in which a sequence program is stored, and a display device for displaying the sequence program in the form of a ladder diagram based on a combination of relay contacts and relay coils, and the sequence can be displayed on the screen of the display device. A series of screen numbers are attached to each range of the program, and a screen number that includes a relay coil corresponding to the relay contact in the ladder diagram is attached and displayed near the relay contact. Ladder diagram display method. (2) The ladder diagram display method according to claim (1), wherein the screen number is taken for each plurality of numbers, and the numbers between the plurality of numbers are assigned after adding the screen number.