JP2520172B2 - Abnormality information detection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an abnormality information detection device for detecting abnormality information regarding a system composed of a master station and a plurality of slave stations connected via one transmission line. .

[Conventional technology]

A control system using a programmable controller (hereinafter referred to as a PC) is known as an example of the above system.

This system is a processor (PC body) as a master station
And an input / output circuit as a slave station and various controlled devices corresponding thereto are the main components. Each input / output circuit and controlled device are installed, for example, at the factory site in a distributed manner, and are connected by a transmission line to exchange data between the processor and the input / output circuit via this transmission line. Then, the PC control system is constructed.

Conventionally, in such a system, when some abnormality occurs in a slave station, the system operation is stopped, the slave station where the abnormality has occurred and the cause thereof are identified, and the location of the slave station is checked and checked sequentially. I was working. As a result, it takes a lot of labor and time to check the abnormality.

On the other hand, an abnormality information storage memory as shown in FIG. 3 is provided in the processor, and when an abnormality occurs, information regarding the station number of the slave station in which the abnormality has occurred and the type of abnormality is set in this memory. An abnormality information detection method has been proposed in which a user operates a program input device or the like to read out and display these pieces of information to identify the location and cause of the abnormality.

FIG. 4 is a flowchart of the above-described abnormality detection processing performed by the processor. For example, when some abnormality occurs in the PC system, this processing is started. First, in step S41, the processor corresponding to each slave station is started. The slave station in which an abnormality has occurred and the cause thereof are detected by referring to a table configured in the RAM indicating the presence or absence of an abnormality and a table similarly configured corresponding to each of the causes of the abnormality and indicating the presence or absence of the cause. Next, in steps S42 and S43, the cause of the abnormality and the station number of the abnormal slave station are set in the abnormality information storage memory in the processor as shown in FIG. 3, and this processing ends.

The user can read the information about the abnormality set by the above-mentioned processing by operating the program input means or the like and display it on the display to know the location and cause of the abnormality.

[Problems to be Solved by the Invention]

However, in the above-described conventional abnormality detection device, even if it is an abnormality related to the input / output circuit itself which is a slave station or an abnormality related to a transmission line such as short circuit or disconnection,
It is detected as an abnormality of the slave station.

As a result, there is a problem in that the location of the abnormality cannot be specified exactly, and system maintenance cannot be performed quickly.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to detect the abnormality of the slave station and the abnormality of the transmission line in a discriminative manner, and further, in which part the transmission line is abnormal. An object of the present invention is to provide an abnormality information detection device capable of specifying whether there is any.

[Means for solving the problem]

Therefore, in the present invention, a master station and a master station connected to the master station 1
A system for controlling the operation of the slave station by the master station while exchanging data via the transmission line between one transmission line and a plurality of slave stations individually connected to the transmission line in a predetermined order. An abnormality detecting means for detecting whether or not the data transmission from the slave station is abnormal, corresponding to each of the slave stations, and an abnormality detected by the abnormality detecting means. When the data corresponding to the slave station next to the slave station corresponding to the data indicated is not abnormal, it is determined that the slave station corresponding to the data indicating the abnormality is abnormal, and from the next slave station to the last slave station. When there is an abnormality in the data corresponding to each of the above, the abnormality determination means for determining that the transmission line on the master station side from the slave station corresponding to the data indicating the abnormality first in the detection is abnormal. Is characterized by.

[Work]

According to the above configuration, it is possible to discriminately detect whether the slave station itself is abnormal or the transmission line is abnormal, and it is possible to specify the abnormal portion.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a PC system showing an embodiment of the present invention.

In the figure, 10 is a processor as a master station, and CP
It has U11, ROM12, RAM13, tables 14 and 15, an abnormality information storage memory 16, and a connection order storage table 17.

The CPU 11 controls signal transmission / reception between each element in the PC system and executes signal processing. The ROM 12 stores the processing procedure of the CPU 11, which will be described later in FIG. 2, and the RAM 13 stores the CPU 1.
It can be used as a work area for control and signal processing performed by 1, or can store a PC program.

The table 17 is configured in the form of, for example, a RAM, and is composed of station number data that can be written by the user of the system according to the connection order of each embedded station, and the table 14 is the station number data of the slave stations arranged according to the table 17. Corresponding to each of these, it is made up of data indicating presence / absence of abnormality, that is, data indicating whether or not data transmission from the slave station is possible. It is composed of abnormality cause data and data indicating presence / absence of the cause corresponding to each of these. These tables 14 and 15 are configured such that when an abnormality occurs in a slave station or a transmission line, the data indicating the presence / absence of the table changes according to the presence / absence of the abnormality. The abnormality information storage memory 16 is a memory similar to that shown in FIG. 3, and the data concerning the station number and the cause of the abnormality of the abnormal slave station specified in the tables 14 and 15 is set.

Reference numeral 20 is a program input device, which is a display unit 21, an input key 2
2, a PC program is created using the display section 21 and the keys 22, and the created program is input and saved. Further, the program input device 20, by performing a predetermined operation of the input key 22, as described above, to set the station number of each slave station in the connection order storage table 17 in the connection order,
The abnormality information set in the abnormality information storage memory 16 is read out and displayed on the display unit 21. The user can specify the location of the abnormality and its cause by the abnormality information displayed on the display unit 21.

Reference numeral 30 is a transmission line that connects the processor 10 as a master station and an input / output circuit described later as a slave station, and a coaxial cable or the like is used. Optical transmission can be applied to this transmission line if necessary.

Input / output circuits 40, 41, 42 and 43 as slave stations are respectively connected to one transmission line 30 connected to the processor 10. Processor 10 and input / output circuit 4 via this transmission line 30
In connection with 0, 41, 42, 43, the user connects the respective slave stations in order from the processor 10 according to the order of the slave stations written in the connection order storage table 17. In this example, the closest input / output circuit 40 is assigned station numbers 10, 41 as station numbers 03, ..., 43 as station number n. A controlled device is connected to each of the input / output circuits 40 to 43.

FIG. 2 is a flowchart of the abnormality information detection processing in the PC system shown in FIG. Before this processing is started, the transmission line from the processor 10 (master station) to the table 14 is
The station number data of the input / output circuit (slave station) is preset in the order of closeness along 30, that is, according to the connection order written in the table 17.

When any abnormality occurs in the system, the process shown in FIG. 2 is started, and first, in step S20, the table 1
4 is searched in the order set above, and the address related to the first station number that indicates abnormal information is specified. Next, in step S21, the address specified in step S20 is incremented by 1, and in step S22 it is determined whether the station number of this address is the final station number.

If it is not the final station number, the process proceeds to step S23, and the contents of the table 14 corresponding to the station number are referred to. Next, in step S24, it is determined whether the information of the slave station having the referenced station number is transmitted according to the referenced content. That is, if the referred slave station has a content indicating an abnormality, it means that the information of this slave station is not transmitted. In this case, the process returns to step S21 to further increment the address of the table 14, and Refer to the contents of the slave station.

If the contents referred to in step S24 are not data indicating an abnormality, that is, if the information of the referred slave station is transmitted, it is determined that there is an abnormality in the slave station (input / output circuit) itself of the station number specified in step S20. Proceed to step S25, from the tables 14 and 15 identified in step S20,
The station number of the slave station and the cause of the abnormality are extracted, and in steps S26 and S27, the abnormality cause data and the abnormal station number data are set in the abnormality information storage memory 16, respectively.

If it is determined that the data has not been transmitted in step S24,
When it is determined that information has not been transmitted from all the slave stations up to the slave station having the final station number after that, the steps S21 to S24 are repeated.
Transmission line 3 on the master station side from the slave station that is identified as abnormal in S20
It is determined that 0 is abnormal, and data indicating that the cause of the abnormality is the transmission line and the first station number data indicating the abnormality to indicate the abnormal portion are set in the abnormality information storage memory 16. That is, if there is an abnormality in the transmission line, all subsequent slave stations cannot transmit data, and all slave stations show abnormal data.

The abnormality cause data and the abnormal station number data set in the memory 16 by the above-described processing are read by operating the input key 22 and displayed on the display unit 21.

As is clear from the above description, when the PC system stops due to an abnormality related to the I / O circuit which is the slave station, the cause of the abnormality can be entered by referring to the abnormality information storage memory 16 using the program input device 20. Whether it is in the output circuit itself or in the transmission line can be discriminated, and the part thereof can be specified.

Further, as another embodiment, if it is determined that the slave stations with the smaller station numbers to which the respective slave stations are attached are connected to the transmission line 30 in the order closer to the processor 10, the table 17 can be omitted.

〔The invention's effect〕

As is clear from the above description, according to the present invention, it is possible to discriminately detect whether the slave station itself is abnormal or the transmission line is abnormal, and it is possible to specify the abnormal portion.

As a result, it is possible to promptly respond to an abnormality that has occurred in the system, and for example, even when the slave stations are scattered over a distance, it is possible to obtain an effect that a great deal of labor and time are not required for processing the abnormality. Was given.

[Brief description of drawings]

FIG. 1 is a block diagram of a PC system showing an embodiment of the present invention, FIG. 2 is a flow chart of abnormality information detection processing in the configuration shown in FIG. 1, and FIG. 3 is a conceptual diagram showing an abnormality information storage memory, FIG. 4 is a flowchart of a conventional abnormality information detection process. 1 ... Address, 2 ... Error cause bit, 3 ... Abnormal station station number bit, 10 ... Processor, 11 ... CPU, 12 ... ROM, 13 ... RAM, 14,15 ... Table, 16 …… Abnormality information storage memory, 17 …… Connection sequence storage table, 20 …… Program input device, 21 …… Display unit, 22 …… Enter key, 30 …… Transmission line, 40,41,42,43 …… Enter Output circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Kakuda 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. Co., Ltd. (72) Inventor Fuyuhiko Yoshikura 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Takayuki Ishihara 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Sadao Kondo 3-20 Kinugahara, Toyota City, Aichi Prefecture, Shinmei Kogyo Co., Ltd. (72) Inventor Yoshiaki Kato, 3-20 Kinugahara, Toyota City, Aichi Shinmei Kogyo Co., Ltd. (56) References JP-A-60-245401 (JP, A) JP-A-62-120142 (JP, A) JP-A-60-223249 (JP, A) JP-A-63-314044 (JP, A)

Claims (1)

(57) [Claims] 1. Transfer of data between a master station, a transmission line connected to the master station, and a plurality of slave stations individually connected to the transmission line in a predetermined order through the transmission line. A device for detecting an abnormality of a system for controlling the operation of the slave station by the master station while performing the above, and detecting whether or not the data transmission from the slave station is abnormal corresponding to each of the slave stations. When the data corresponding to the slave station next to the slave station corresponding to the data indicating the abnormality detected by the abnormality detecting means is not abnormal, the slave station corresponding to the data indicating the abnormality is abnormal. When the data corresponding to each of the next slave station to the last slave station is abnormal, the transmission line on the master station side from the slave station corresponding to the first data indicating the abnormality in the detection is determined. The abnormality determination means for determining that the Abnormality information detecting apparatus according to claim.