JPH01295545A - Diagnostic system for node - Google Patents

Abstract

PURPOSE:To improve the diagnostic efficiency by releasing the bypass function of a specific node only, sending a diagnostic data and diagnosing a specific node based on a received reply data in plural nodes having a bypass function applying data transfer not through the internal function. CONSTITUTION:Plural nodes 111 are connected in a ring and each node 111 has a bypass function transferring a data not through the internal function. A bypass command is sent to other node by using a bypass command sending means 131 included in a diagnostic device 121 corresponding to the node 111 to send the diagnostic data to a specific node by using a diagnostic data transmission means 141 forming A bypass of the other node than the specific node and the diagnostic means 151 diagnoses the node based on a reply data in response to the diagnostic data. The diagnosis as above is applied to each node to detect a faulty location without stopping the system thereby improving the diagnostic efficiency.

Description

[Detailed Description of the Invention] [Summary] For example, regarding a node diagnosis method that performs functional diagnosis of each ring-connected node in a local area network, the purpose of improving diagnosis efficiency is to diagnose the internal functions. In a node diagnosis method when multiple nodes with a bypass function that transfers data without going through a ring are connected, each diagnostic device corresponding to each node issues bypass instructions to other nodes via the node. a bypass instruction sending means for sending diagnostic data to another node via the node; a diagnostic data sending means for sending diagnostic data to another node via the node; The device is configured to cancel the bypass function of only a specific node, send diagnostic data, and diagnose the specific node based on the received response data.

[Industrial application field]

The present invention relates to a node diagnosis method, and for example, to a node diagnosis method for performing functional diagnosis of each node connected in a ring in a local area network.

(Prior Art) Generally, there are a lotus type LAN and a ring type LAN in front of the network in the local area m (LAN). In the latter type of ring-type LAN, nodes for connecting computers, data terminals, etc. are connected in a ring, and data is transmitted from each node to the next node, reducing distance constraints. There are advantages.

[Problem to be solved by the invention]

By the way, in the above-mentioned LAN having a plurality of nodes connected in a ring, if a failure occurs in any node, it becomes impossible to send and receive not only normal communication data but also data for fault diagnosis. Therefore,
There was a problem that the system had to be stopped in order to detect the fault location, resulting in poor diagnostic efficiency.

The present invention was created in view of these points, and an object of the present invention is to provide a node diagnosis method that improves diagnosis efficiency.

[Means to solve the problem]

FIG. 1 is a principle block diagram of a node diagnosis method according to the present invention.

In the figure, each diagnostic device 121 corresponding to each node 111 in a node diagnosis method when a plurality of nodes having a bypass function that transfers data without going through an internal function is connected in a ring. Bypass instruction sending means 131 for sending bypass instructions to other nodes
, a diagnostic data sending means 141 that sends diagnostic data to other nodes via the node 111, and a node 111.
and a diagnostic means 151 for diagnosing other nodes based on response data corresponding to the diagnostic data received via.

The bypass function of only a specific node is canceled, diagnostic data is sent out, and the specific node is diagnosed based on the received response data.

[Operation] A plurality of nodes 111 are connected in a ring, and each node 111 has a bypass function to transfer data without going through internal functions.

By sending a bypass instruction to other nodes by the bypass instruction sending means 131 included in the diagnostic device 121 corresponding to this node 111, the diagnostic data sending means 141 forms a bypass for other nodes other than the specific node. Diagnostic data is sent to the node, and the diagnostic means 151 diagnoses the node based on response data corresponding to the diagnostic data.

In the present invention, the bypass function of a specific node is canceled and diagnostic data is sent, and the response data is diagnosed by the diagnostic means 151. By performing such a diagnosis on each node, , it becomes possible to detect a fault location without stopping the system, and diagnostic efficiency can be improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows the configuration of an embodiment to which the node diagnosis method of the present invention is applied.

(2) Correspondence between 1 and U Here, the correspondence between the embodiment of the present invention and FIG. 1 will be shown.

The node 111 corresponds to the monitoring node 211.

The diagnostic device 121 corresponds to the diagnostic device 221.

The bypass instruction sending means 131 includes a data link control section (
DLC) 217. Microprocessor (MPU) 231
．． It corresponds to the memory 233.

The diagnostic data sending means 141 is the DLC217°MPU2.
31. It corresponds to the memory 233.

The diagnostic means 151 includes the MPU 231. It corresponds to the memory 233.

Examples of the present invention will be described below assuming that the correspondence relationship as described above exists.

Knee Implementation Spot ■ Structure In FIG. 2, a monitoring node 211 and n interface nodes (IN nodes) 311+.

..., 31! ,, are connected in a ring. for example,
Each node after the IN node 3111 is connected in a ring to the next stage of the monitoring node 211, and furthermore, the IN node 311
A monitoring node 211 is connected as the next stage of fi.

A diagnostic device 221 is connected to the monitoring node 211, and each diagnostic device 321 is connected to each rN node 311 in a one-to-one correspondence.

The monitoring node 211 includes a separation circuit (DM) that separates desired data from multiplexed data received via the LAN line.
UX) 213, a multiplexing circuit (MUX) 215 that multiplexes data and sends it to the LAN line, and a DLC 217 that controls data exchange between the LAN line and the diagnostic device 221 via the DMUX 213 and MUX 215. .

It is assumed that each IN node 311 has the same configuration as the monitoring node 211, and a description thereof will be omitted.

Now, let's focus on the monitoring node 211. The data received from the previous stage (■N node 31111) is sent to DMUX213.
．． It is supplied to the diagnostic device 221 via the DLC 217.

Data sent from the monitoring node 211 to the next stage (IN node 311.) is supplied from the diagnostic device 221 to the MUX 215 via the DLC 217, and is sent from the MUX 215.

Furthermore, each IN node 311 has a bypass function that, when receiving a bypass instruction from the previous stage, sends the data received by the DMUX 313 from the IN node 311 to the next stage without separating the data. DMUX213 and MUX
Each of the DMUX 215 has an internal changeover switch, and when it receives a bypass instruction, the changeover switch is changed to form a bypass between the DMUX 213 and the MUX 215. By providing this changeover switch on the LAN line side, data can be transferred without going through the internal functions of each IN node 311.

Further, the diagnostic device 221 includes an MPU 231 that controls the entire diagnostic device 221, a memory 233 that stores a diagnostic program executed by the MPU 231, and a memory 233 that stores a diagnostic program executed by the MPU 231.
1, and a display section 235 for displaying the diagnosis results in step 1.

It is assumed that each diagnostic device W321 has the same configuration as the diagnostic device 221, and a description thereof will be omitted.

Note that each node (monitoring node 211 and each IN node 31
1) is connected to a processing device, etc. that performs data communication during normal operation, but is omitted in FIG. 2 because it is not related to node diagnostic operations.

Next, the operation of the node diagnosis method according to the embodiment of the present invention described above will be explained.

FIG. 3 shows the operating procedure of the embodiment.

Now, consider a case where the diagnostic device W221 diagnoses each node. The MPU 231 of the diagnostic device 221 uses the memory 23
It is assumed that the diagnostic program stored in No. 3 is executed to perform the diagnostic operations shown below.

First, the MPU 231 sends a bypass instruction to all IN nodes 311 (IN nodes 3111 to 311.) except the monitoring node 211 (step 311). MPU231
sends a bypass instruction to the MUX 215 via the DLC 217, and the MUX 215 multiplexes the bypass instruction data and sends it to the next stage IN node 3111. When each IN node 311 receives a bypass instruction from the MPU 231 (monitoring node 211), it forms a connection path (bypass) between the DMUX 313 and the IN node 311.

Next, the MPU 231 sends a bypass cancellation instruction to the downstream node (step 312).

First, a bypass cancellation instruction is sent to the IN node 3111 at the next stage.

IN node 311. When the bypass is released in
Next, the MPU 231 sends diagnostic data (step 313). Similar to the bypass instruction, the diagnostic data sent from the MPU 231 is transmitted to the DLC 217 and MUX 21.
5 to the IN node 3111.

IN node 311. Since the bypass is canceled, the diagnostic data received by DMUX 313 + is DL.
It is supplied to the diagnostic device 321° via C317+. Diagnostic device 321. When receiving the diagnostic data, the node sends the diagnostic data to the next node again. In other nodes, data transfer is performed via the bypass, so the diagnostic device 321. Diagnostic data sent from the monitoring node 211 will be sent back to the monitoring node 211 regardless of the presence or absence of a functional failure in other nodes.

After transmitting the diagnostic data in step 313, the MPU 231 determines whether response data has been received (step 314). The DLC 217 of the monitoring node 211
Diagnostic device 321. , response data (diagnosis device 32
If the diagnostic data transmitted from the computer has not been received, a negative determination is made, and a determination is made as to whether a predetermined time has elapsed since the diagnostic data was transmitted (step 315). If a negative determination is made (within a predetermined time), the determination process of step 314 is repeated.If an affirmative determination is made in step 315 (when a predetermined time has elapsed without receiving response data), the response data will be rejected because a failure has occurred in the IN node 3111. The MPU 231 diagnoses that the return has not been made, and displays a message to that effect on the display unit 235 (step 316).

Next, the MPU 231 determines whether all IN nodes 311 have been diagnosed (step 31
8). If there is an IN node for which the diagnosis has not been completed, a negative determination is made and the process returns to step 312 to repeat the diagnosis operation for the next node. Note that when starting the diagnostic operation for the next node, the IN node 311. A bypass instruction is sent to the node to cancel the bypass only for the node to be diagnosed.

Further, if an affirmative determination is made in step 314 (response data received?), then the MPU 231 determines whether or not the response data is normal (step 317).

If the diagnostic data sent in step 313 and the received response data are different, a negative determination is made. In this case, the MPU 231 diagnoses that the response data has been altered due to a failure in the IN node 311+, and the MPU 231
35, a message to that effect is displayed (step 316). Next, the process of step 318 is performed.

If an affirmative determination is made in step 317 (is the response data normal?), then step 318 is determined.

If an affirmative determination is made in step 318 (whether the diagnosis of all nodes has been completed), the diagnosis processing is terminated.

■Summary of the above In this way, the monitoring node 211 and each IN node 311
First, each I node other than the IN node 311 is connected in a ring.
A bypass is formed at N node 311. Next, M.P.
U231 sends diagnostic data via monitoring node 211. This diagnostic data is returned via the IN node 3111 and the diagnostic device 3211 connected to this IN node 3111. By checking the presence or absence of this response data or the presence or absence of an abnormality in the response data, it is possible to detect a failure in the N node 311+.

Thereafter, the bypass for other IN nodes 311 is released in order, and each IN node 311 is diagnosed in the same manner.

Therefore, after sending a bypass instruction to each IN node 311, each IN node 311 can be
Therefore, there is no need to stop the system and check whether there is a failure at each node, and efficient diagnosis can be performed.

In addition, through program processing of processing equipment during operation,
If the diagnostic device 221 performs the diagnostic operation, it becomes possible to diagnose each node without adding any hardware.

■ Note that in the embodiment of the present invention described above, each IN node 311 (!-) was diagnosed by the diagnostic device 221, but when diagnosing the monitoring node 211, other Diagnostic data may be sent from a diagnostic device (for example, diagnostic device 321+).

Further, in the embodiment, a case was considered in which each node has multiplexing and demultiplexing functions, but the present invention can be applied to any node connected in a ring. In the embodiment, the response data corresponding to the diagnostic data is the same as the diagnostic data, but any data may be used as long as the correspondence relationship is known.

Furthermore, in r(, Correspondence between Examples and FIG. 1),
Although the correspondence between the present invention and the embodiments has been described, those skilled in the art will easily assume that the present invention is not limited to this and that there are various modifications.

〔Effect of the invention〕

As described above, according to the present invention, the bypass function of a specific node is canceled, diagnostic data is sent from the diagnostic data sending means, the response data is diagnosed by the diagnostic means, and this diagnosis is performed for each node. This makes it possible to improve diagnostic efficiency, which is extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a principle block diagram of the node diagnosis method of the present invention, FIG. 2 is a block diagram of an embodiment to which the node diagnosis method of the present invention is applied, and FIG. 3 is an explanatory diagram of the operation of the embodiment. In the figure, 111 is a node, 121 is a diagnostic device, 131 is a bypass instruction sending means, 141 is a diagnostic data sending means, 151 is a diagnostic means, 211 is a monitoring node, and 213.313 is a DMUX. 215.315 is MUX. 217.317 is DLC. 221.321 is a diagnostic device, 231 is an MPU. 233 is a memory, 235 is a display section, and 311 is an IN node. →Professional/Professional of the present invention...17 Flash Figure 1; Age L sepa! Moi 41j6 Rika Dob 2 cases 28 days 1'
3E] Figure 3

Claims (1)

[Claims] (1) In a node diagnosis method when a plurality of nodes having a bypass function that transfers data without going through internal functions are connected in a ring, each diagnostic device (121) corresponding to each node (111) is , bypass instruction sending means (131) for sending a bypass instruction to another node via the node (111), and diagnostic data sending means (131) for sending diagnostic data to the other node via the node (111). 141); and a diagnostic means (151) for diagnosing the other node based on response data according to the diagnostic data received via the node (111), and bypassing only a specific node. A method for diagnosing a node, characterized in that the specific node is diagnosed based on the response data received by canceling the function and transmitting the diagnostic data.