JPH06161517A - Monitoring device for pc - Google Patents

Abstract

PURPOSE:To easily perform a fault analysis by displaying a laddar circuit block including an abnormal input/output element when the abnormality occurs in the operations of an equipment. CONSTITUTION:At the time of an abnormal stop, the state data of the input/ output elements which are necessary for processings is read from each PC, it is stored in a state data area 151, a logical operation is performed in accordance with the logical expression of a logical operation setting area 157 and the operation result is stored in the state data area 151. In the case of the abnormality, the state data of the output element of an abnormal portion table area 152 is read from the state data area 151, abnormal output elements are specified, the address information on a ladder circuit block including abnormal output elements is read. Next, the program part of the ladder circuit block of a PC designated by the address information is read, it is stored in an object program area 154, it is stored in a source program area 153 by reversely being converted into a source program, and a ladder circuit including output elements showing the abnormality in accordance with it is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically displays the ladder circuit block corresponding to the cause of abnormal stop during execution of a programmable controller (hereinafter referred to as "PC") for controlling a machine tool. The present invention relates to a monitor device.

[0002]

2. Description of the Related Art Conventionally, a plurality of P's such as a transfer machine is used.
If an abnormal stop occurs in a system using C, a person with specialized knowledge and experience should use his or her own experience and intuition to analyze the ladder circuit of the PC and search for the abnormal point. Is being done.

That is, when displaying the ladder circuit of the PC on the screen, the operator manually specifies the PC number and the address of the input / output element to display the corresponding ladder circuit block. .

[0004]

Therefore, it takes a long time to display a predetermined ladder circuit block to be monitored, and it takes a long time for failure analysis. In addition, there is a problem that only a specific person can perform the analysis, and the abnormal part is only inferred based on the experience and intuition of the operator. Whether or not the inferred input / output element is really a failure element is actually There is a problem that it cannot be determined unless the sequence circuit is operated. The present invention has been made to solve the above problems, and an object thereof is to automatically display a ladder circuit block including an abnormal input / output element when an abnormality occurs in the operation of equipment. And to facilitate failure analysis.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a table defining the relationship between an output element for abnormality detection and block address information specifying a ladder circuit block to be displayed is provided, and status data of input / output elements is provided. Is constantly monitored to determine whether or not the monitored state data of the output element indicates an abnormal state, and block address information corresponding to the output element determined to be in the abnormal state is obtained from the table. A corresponding block is extracted from a corresponding program based on the address information, and the ladder circuit block is displayed together with the state data of the input / output elements based on the extracted program.

Another feature of the present invention is that a logical operation can be set in which the result of the logical operation of the status data of a certain input / output element of a certain PC is used as the status data of the output element. It is characterized in that the relationship with information is stored in a table.

Another feature of the present invention relates to an abnormality monitor for a system such as a transfer machine using a plurality of PCs. The plurality of PCs are connected to a link line that can mutually refer to the status data of each input / output element, and the status data can be monitored by a monitor device. Then, the block address information includes PC information that identifies the programmable controller having the ladder circuit block, and based on the block address information, extracts the corresponding block from the corresponding program stored in the corresponding programmable controller, The ladder circuit block is displayed together with the state data of the input / output elements based on the extracted program.

[0008]

FUNCTION AND EFFECT OF THE INVENTION A ladder circuit block capable of detecting an abnormality is programmed in the PC program. That is, a ladder circuit block in which the result of the logical operation of the status data of a plurality or a single input / output element becomes the status data of the output element is provided in the program of the PC. Therefore, the abnormality data can be detected by constantly monitoring the state data of the output element when the PC is executed. Also, when an abnormality is detected, the ladder circuit block to be displayed is determined by referring to the table. Therefore, in advance, in the table, the output element and the address of the ladder circuit block to be displayed which is related to the abnormal state are displayed. It is possible to immediately display the ladder circuit block at the abnormal portion simply by specifying the information.

According to another aspect of the invention, a logical operation in which the result of the logical operation of a plurality of or a single input / output element of a certain PC is used as the status data of the output element is set in the monitor device regardless of the program of the PC. You can Therefore, PC
It is possible to display the circuit block of the abnormality detection and the abnormal portion without the need to modify the program and add the circuit for the abnormality detection.

Further, according to another aspect of the invention, the PC having the ladder circuit block is specified from among the plurality of PCs based on the block address of the ladder circuit corresponding to the abnormally detected output element, and the program of the PC is specified. The corresponding circuit block is read out, and the ladder circuit block having the failure point is displayed based on the program.
Therefore, even in a system having multiple PCs, each PC
It is possible to display the circuit block at the abnormal portion without providing another special means for storing the program.

[0011]

EXAMPLES The present invention will be described below based on specific examples. FIG. 2 shows the configuration of a transfer machine controlled by a plurality of PCs PC01 to PC32. Stations of transfer machine ST0, ST1L, ST1R, ... ST3R
Are controlled by corresponding PCPC01-PC32, respectively, and each PCPC01-PC32 is coupled to each other by a link line L and a communication line C. Each PC
The state data of the input / output elements of is mutually referred to via the link line L. Also, link line L and communication line
The monitor device 1 is connected to C, and the monitor device 1 can constantly monitor the status data of the input / output elements of all the PCs via the link line L. The program of the circuit block to be read can be read. Each station ST0, ST1L, ST1R, ...
・ As shown in the figure, each ST3R has a device M1
Option ST0), 11M1 (ST1R), ... 3M1 (ST3R)
Are provided.

FIG. 1 is a block diagram showing a specific configuration of the monitor device of this embodiment. CPU 1 for monitoring input / output elements, detecting abnormalities, and displaying ladder circuit blocks
0, ROM1 storing the program for the processing
1. As shown in FIG. 10, a CRT 12 displaying a cycle diagram or a ladder circuit, and a logical operation for converting the result of the logical operation of the state data of the input / output element into the state data of the output element by the format shown in FIG. Keyboard 13 to set, CP
Input / output interface 14 interposed between U10, CRT 12 and keyboard 13, R for storing various data
It is composed of AM15. Further, the RAM 15 has a status data area 151 for storing status data of input / output elements to be monitored and status data of output elements related to abnormality detection, as shown in FIG.
As shown in FIG. 5, the relationship between the address in the status data area 151 storing the status data of the output element for detecting an abnormality and the address information of the circuit block to be displayed (the PC number to which the output element belongs and the address in the PC) is shown. Abnormal part table area 152 stored, source program area 153 storing source program after inverse conversion, each PC
The object program area 154 for storing the object program read from, the ladder circuit diagram area 155 for storing the ladder circuit block to be displayed, and the cycle data area for storing the cycle data for determining the execution cycle as shown in FIG. 156, a logical operation setting area 157 for setting a logical operation for the status data of the input / output element of the PC or the status data stored in the status data area 151.

As shown in FIG. 3, the PC 01 stores a CPU 20 for sequence control and communication control, a sequence control program (object program) and link parameters, and a state of input / output elements to be controlled and It has a RAM 25 for storing the state of the link element received from the link line, and a ROM 21 in which a program for processing execution of the CPU 20 is stored. Input / output element 270
1, 2702 and the like are controlled by the CPU 20 via the drive circuit 27 and the input / output interface 24. RAM
25, an input element state memory 251, an output element state memory 252, an internal relay memory 253, a link element memory 254, a link parameter memory 255, and a sequence control program memory 256, which store the states of the input / output elements, are formed. Of these, the sequence control program memory 2
In 56, an object program corresponding to a ladder circuit that defines order control is stored. Further, the internal relay memory 253 is used as a virtual relay for relaying the ladder circuits of each row, and is also used as an output element (relay) for failure detection.

Next, an operation procedure of the CPU 10 of the monitor device 1 will be described. First, an abnormal point table as shown in FIG. 7 is stored in the area 152 of the RAM 15. This abnormality location table is a RAM of output elements for abnormality detection.
15 is a table that defines the relationship between the addresses in the fifteen state data area 151, the number of the PC in which the output element exists, and the address in the PC.

Corresponding to the cycle diagram shown in FIG. 8, the normal state data of the input / output elements at the end of each cycle (main arm inversion, tool loosening, main arm lowering, etc.) is defined. The cycle data shown in FIG. 9 (the cycle data shown in FIG. 9 represents the cycle data at the end of the main arm inversion cycle) is RA.
It is stored in the cycle data area 156 of M15.

Next, the logical operation for abnormality detection is set according to the processing procedure shown in FIG. What if each PC
In the above program, when the program is built so that the abnormality can be detected by the state data of the output element, the state data of the output element is directly adopted for the abnormality determination. The setting of this logical operation means that a program for abnormality detection can be set up regardless of the program of each PC.

In step 100, the keyboard 13
By adopting, the logical operation expression is input as shown in FIG. In FIG. 5, “1” of “1-1000” means the PC number to which the output element belongs, and “1000” means the address of the PC of the output element number 1. "300 on the right side
2 ”is the state data area 1 of the RAM 15 of the monitor device 1.
Means the address at 51. The first expression of FIG. 5 shows the result of the logical product operation of the state data of the input / output element of the address “1000” of the PC with number 1 and the state data of the input / output element of the address “1020” of the PC with number 1. This means that the status data of the output element of the address “3002” in the status data area 151 is used. In the fourth expression, the result of the logical sum operation of the state data of the output element at the address “3004” and the state data of the output element at the address “3006” in the state data area 151 is the state of the output element at the address “3008”. It means to be data.

When such a logical operation expression is input, the logical operation expression is stored in the RAM 15 in step 102.
Is stored in the logical operation setting area 157 of FIG. Step 10
The logical operation expression is repeatedly input until a command for ending the input of the logical operation expression is given in 4.

Next, the display procedure of the corresponding ladder circuit block at the time of abnormal stop will be described with reference to the flowchart of FIG. In step 200, the status data of the input / output elements necessary for the processing is read from each PC. The input / output elements necessary for processing are the input / output elements shown in FIG. 8 necessary for determining the current execution cycle, and the output elements set in the abnormal point table shown in FIG. 7 necessary for abnormality detection. These read status data are stored in the status data area 151 of the RAM 15.

Next, in step 202, the RAM 1
5, the logical operation of the state data is executed according to the logical expression shown in FIG. 5 stored in the logical operation setting area 157 of FIG. 5, and the operation result is stored in the address designated by the logical operation expression of the state data area 151.

Next, at step 204, the status data of the input / output elements of each PC is stored in the cycle data area 156.
It is determined whether or not it matches the cycle data of the first cycle shown in FIG. If they match, it is determined that the first cycle has ended, and the current execution cycle is determined. In this way, by sequentially counting execution cycles each time the cycle data is satisfied,
The current cycle is managed.

Next, in step 206, as shown in FIG. 10, the execution completion cycle is displayed in bold on the CRT 12. Then, in step 208,
It is determined whether the cycle has changed within a predetermined time.
That is, before the elapse of the predetermined time, the process returns to step 200, the above process is repeated, and the current cycle is displayed. If the cycle does not change after a predetermined time elapses after the cycle changes, it is determined to be abnormal. In the case of an abnormality, in step 210, the state data of the output element set in the abnormal point table area 152 of the RAM 15 is RA.
It is read from the state data area 151 of M15. Next, in step 210, if the state data of the output element is "1", it is determined to be abnormal. When it is determined that the output element is abnormal, the abnormal output element is specified in the abnormal point table in step 214, and the address information of the ladder circuit block including the abnormal output element is read.

Next, in step 216, from the PC number designated by the address information and the address of the output element, the corresponding ladder circuit block of the corresponding program is accessed from the sequence control program memory 256 of the RAM 25 of the designated PC. The program portion is read, and the object program area 154 of the RAM 15
Memorized in. Next, in step 218, the object program is converted back into a source program and stored in the source program area 153.

Next, in step 220, the ladder circuit including the output element indicating the abnormality is displayed as shown in screen 2 of FIG. At this time, the on / off state of the input / output element included in the circuit, the PC number and the address of the input / output element are also displayed.

Next, in step 212, when the state data of the output element does not indicate abnormality, step 22
The display shifts to 2 and the CRT 12 displays a message indicating that it is normal.

As described above, when the equipment is abnormally stopped, the ladder circuit including the abnormal portion is displayed on the CRT screen, so that the states of the input / output elements of the circuit are sequentially checked, thereby making a final check. The cause of a specific abnormality can be pursued.

In the above embodiment, as shown in FIG.
Of the programs stored in the plurality of PCs (PC1, PC2, PC3), the designated block of the designated program is read by the monitor device 1, and the ladder circuit including the abnormal portion is read based on the read program. Is displayed.

However, as shown in FIG. 12, the abnormal output element is detected by the PC 1, the address information of the output element is transmitted from the PC 1 to the monitor apparatus 1, and the abnormal state is indicated by the monitor apparatus 1. You may make it read the abnormal block of the program of PC, and display the ladder circuit on CRT.

Further, as shown in FIG. 13, the monitor device 1
Then, the programs loaded in all the PCs are stored, and instead of reading the programs from the PCs when an abnormality is detected, the ladder circuit block including the abnormal portion is CRT-processed according to the program stored in the monitor device 1.
It may be displayed on the screen.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a monitor device according to a specific embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a transfer machine using a PC to which the monitor device is connected.

FIG. 3 is a block diagram showing the configuration of a PC.

FIG. 4 is a flowchart showing a processing procedure of a CPU of the monitor device.

FIG. 5 is an explanatory diagram illustrating logical operation setting.

FIG. 6 is a flowchart showing a processing procedure for displaying an abnormality of the CPU of the monitor device.

FIG. 7 is a configuration diagram of an abnormal point table showing a relationship between output elements for detecting an abnormality and address information of a ladder circuit block to be displayed.

FIG. 8 is an explanatory diagram illustrating a cycle diagram.

FIG. 9 is an explanatory diagram showing state data of input / output elements for sequel determination.

FIG. 10 is an explanatory diagram showing a cycle diagram displayed on a CRT and a ladder circuit of an abnormal portion.

FIG. 11 is an explanatory diagram showing the concepts of abnormality monitoring and program reading.

FIG. 12 is an explanatory diagram showing the concepts of abnormality monitoring of a monitor device and reading of a program according to another embodiment.

FIG. 13 is an explanatory diagram showing the concepts of abnormality monitoring of a monitor device and reading of a program according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Monitor device 10 ... CPU (state monitoring means, abnormality determination means, block detection means, circuit display means, logical operation setting means) 13 ... Keyboard (logical operation setting means) 12 ... CRT (circuit display means) 15 ... RAM ( Data storage means 151 ... Status data area (status monitoring means) 152 ... Abnormal location table area (data storage means) 157 ... Logical operation setting means 25 ... RAM (program storage means) 256 ... Sequence control program memory (program storage means) Steps 100 to 104 ... Logical operation setting means Step 200 ... Status monitoring means Steps 200 to 212 ... Abnormality determination means Step 214 ... Block detection means Steps 216-220 ... Circuit display means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sadaji Uno 1-1, Asahi-cho, Kariya city, Aichi prefecture Toyota Koki Co., Ltd. (72) Inventor Yasumasa Ueda 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (3)

[Claims] 1. A monitor device for displaying an abnormal state of equipment controlled by a programmable controller, comprising: a program storing means for storing a program for sequence control by the programmable controller; an output element for detecting an abnormality; and a display. A data storage unit that stores a table that defines the relationship with the block address information that specifies the ladder circuit block to be performed, and a state monitor that constantly monitors the state data of the input / output elements of the programmable controller when the programmable controller is executed. Means, an abnormality determining means for determining whether or not the state data monitored by the state monitoring means of the output element set in the data storage means indicates an abnormal state, and an abnormal state by the abnormality determining means. Corresponding to the output element determined to be The block address information is stored in the program storage means on the basis of the block detection means for obtaining the block address information by searching the table stored in the data storage means, and the block address information detected by the block detection means. A programmable controller monitor device having circuit display means for extracting a corresponding block from a corresponding program and displaying the ladder circuit block together with the state data of the input / output elements based on the extracted program. 2. The monitor device has logical operation setting means for setting the result of the logical operation of the state data of the input / output element of the programmable controller as the state data of the output element, and is stored in the data storage means. 2. The programmable controller monitor device according to claim 1, wherein the table stores the output element and block address information. 3. The monitor device is a monitor device in a system in which a plurality of programmable controllers are connected to a link line that can mutually refer to the state data of input / output elements, and the program storage means is a sequence in each programmable controller. The block address information includes PC information for specifying a programmable controller having the ladder circuit block, and the circuit display means corresponds to the block address information based on the block address information. The means for extracting the corresponding block from the corresponding program stored in the programmable controller, and displaying the ladder circuit block together with the state data of the input / output elements based on the extracted program. Claim 1 A programmable controller monitor device according to.