JPH01170242A - Self-diagnosis system for secondary station - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] Regarding a self-diagnosis method for a secondary station in a loop network connecting a primary station and a secondary station, an object of the present invention is to quickly detect a faulty secondary station. The purpose is to connect a primary station and multiple secondary stations via a loop-type transmission line, and each secondary station has a switch unit inserted into the transmission line to input and output transmitted data, a data processing unit, and a switch unit inserted into the transmission line to input and output transmitted data. In a secondary station self-diagnosis method in a data transmission system having a synchronization check section that checks input data to a data processing section, the secondary station includes a second synchronization check section that checks output data of the data processing section. and configuring the switch section so that the output data of the data processing section is sent to the second synchronization check section during bypass mode, in which only transmission data is input and no output is performed, and the switch section is set to bypass mode.
The second synchronization check section performs a synchronization check on the output data to perform self-diagnosis.

[Industrial application field]

The present invention relates to a self-diagnosis method for a secondary station in a loop type network connecting a primary station and a secondary station.

There is a system that connects a primary station and multiple secondary stations with a loop network to transmit data. FIG. 9 is an explanatory diagram of this type of system. Data (packets) are transmitted in one direction as shown by the arrows, and each secondary station 10 receives it, and if it is addressed to itself, it is taken in and transmitted to the subordinate station. It is sent to the terminal, and if it is not addressed to itself, it is sent to the next secondary station.

[Conventional technology]

As shown in FIG. 9, each secondary station includes a switch section 11 that performs input/output to the internal circuit, a synchronization check section 12 that checks input data, and a synchronization check section 12 that performs data disassembly and assembly.
It has a data processing section 13 that performs rewriting and the like. 20 is a transmission path.

FIG. 10 shows the flow of data during normal operation (a), during bus failure (b), and when a failure occurs in the internal circuit (C). (a
), during normal operation, the data on the input side transmission line is taken into the data processing unit 13 through the synchronization check unit 12, data addressed to itself is sent to the terminal (not shown), and data not addressed to itself is sent to the output side transmission line. Send to. When the secondary station is disconnected from the transmission line (bypassed), the switch 11 directly connects the input side of the transmission line 20 to the output side as shown in Figure Cb1.

[Problem that the invention seeks to solve]

If a failure occurs in the data processing unit 13 during normal operation,
As shown in FIG. 1C, normal data is no longer sent to the output transmission path. The x mark indicates the occurrence of a failure, and the dotted line indicates the sending route of the destroyed data.

If a failure occurs in the data processing unit (internal circuit), reception is normal and the secondary station does not detect the failure. However, all secondary stations downstream from the secondary station in question will have data errors, so it is necessary to bypass the faulty station, bring it down, and disconnect it from the system so that normal data can be sent to the downstream secondary station. be. However, in the conventional system, the secondary station is
It does not have the ability to detect such failures by itself.

Therefore, the primary station had to diagnose each secondary station in turn, detect the faulty station, and bypass it. This takes time to isolate the faulty station.

The object of the present invention is to improve these points and to enable rapid detection of a faulty secondary station.

[Means for solving problems]

As shown in FIG. 1, in the present invention, a synchronization check section is provided on the output side as well as on the input side. 14 is the synchronization check section on the output side, and the data processing section 13 is controlled by the switch section 11.
Instead of being sent out to the output side transmission path, the output is turned back at the switch section so that it can be sent out to the synchronization processor 14.

The transmission line '20 may be duplexed to provide two sets, a working system and a standby system. Figure 2 shows this example, with 20A
is a transmission line for the active system, and 20B is a transmission line for the protection system (or vice versa). In this case as well, two sets of synchronization check sections 12 and 14 are provided.

[Effect]

The secondary station has two modes, operating and bypassing, but the secondary station shown in Figure 1 is the same as the conventional one during normal operation, and it takes in data from the input transmission path and checks the synchronization with the synchronization check unit 12. If the data is addressed to itself, the data processing unit takes it in and sends it to a terminal (not shown), and if it is not addressed to itself, it sends it to the output transmission path.

In the bypass mode, as shown in the figure, the input and output sides of the transmission line 20 are directly connected, and the output of the data processing section 13 is sent to the synchronization check section 14. This enables self-diagnosis at each secondary station, and if a failure occurs (data processing unit 13
If the output data of the secondary station is destroyed), the failed secondary station can be autonomously brought down and disconnected from the system by leaving it on bypass and preventing it from returning to operational mode.

The redundant system shown in Figure 2 is operated as shown in Figure 3 during normal operation. That is, the active system 20A is the same as the conventional system (FIG. 10(a)), and the synchronization check section 14 provided in the present invention is the same as the backup system 20A.
Connect to 0B and check the synchronization of the transmission data of the backup system. Therefore, it is possible to check whether the protection transmission line 20B is normal or abnormal.

During bypass, the output of the data processing section 13 is sent to the synchronization check section 14 by turning back at the switch section 11 as shown in FIG. This is the same as in FIG. 1, and the secondary station becomes capable of self-diagnosis, and if there is a failure, it enters the "pass mode".

When switching between the active system and the standby system, only 2OA and 20B are replaced, and the rest is the same as above.

Figure 5 shows the procedure for disconnecting a failed secondary station. When the primary station finds that there is an abnormality in the data sent from the secondary station (
21), sends bypass mode to all secondary stations (22). In the bypass mode, as shown in FIG. 1, even if a certain secondary station is in trouble, a bypass instruction can be given to the downstream secondary station.

Upon receiving the bypass instruction (31), each secondary station switches its own switch 11 (32) to the bypass state, and checks whether the output of the data processing unit 13 is normal using the synchronization check unit 14 (33). This test data is sent by the primary station. As a result of the check, secondary stations whose data is found to be abnormal are put into bypass mode (34) and do not return to operational mode.

The primary station then performs a transmission path check, and then each secondary station status check (24). Each secondary station that has received this status check signal (35) makes a normal response (36) if the result of the output data normality check (33) is OK. If it is NG, it will remain down and nothing will be done. Upon receiving a normal response from the secondary station, the primary station learns of the normal secondary station (25), sends the instruction as a normal secondary station operation (26), and receives this instruction (37). The station switches to operational mode (38).

The above is the case when the primary station detects an abnormality in the input data, but it may also issue a bypass instruction for the purpose of stopping the secondary station, and the secondary station self-diagnosis is also performed at this time.

〔Example〕

FIG. 6 shows a specific example of the switch section 11. Changeover switches 5WO-3W6 are arranged as shown. By switching these changeover switches SWO to SW6 as shown in FIG. 7, states 1 to 4 are obtained. In this figure 7, the switch setting is 1.
．． 0 means that the switches 5WO-3W6 are set to the θ side in FIG.
Say switching to the side. Also, - indicates that either 1.0 is acceptable. In addition, the 0 series and 1 series refer to the A series and B series (
As shown in the model diagram, states 1 to 4 are the same as in FIG. 3, and states 3 and 4 are the same as in FIG. State 2.4 is similar to state 1.3, but the working/spare state has been swapped.

FIG. 8 shows a detailed example of the configuration of the data processing section 13. Data transmission through the transmission paths 2OA and 2B is performed using packets. 41 is a processing block that disassembles the bucket/t and extracts the data, and 44 is a packet assembler that reassembles it into packets and sends them out. Reference numeral 42 denotes a control information analysis section from the primary station, which decodes the above-mentioned bypass instruction and switches the switch section 11 via the switch control section 45. 43 is a data monitoring unit, and a synchronization check unit 12
．． Data monitoring is performed together with 14. This data monitoring
During operation, input data to the data processing section 13 and preliminary data are monitored, and during bypass, input and output data of the data processing section 13 are monitored.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to diagnose the secondary station and disconnect the faulty secondary station by simply putting the secondary station into the bypass state, and it is possible to diagnose each secondary station one by one from the primary station. Compared to the conventional method of diagnosing, it is possible to shorten the time required for diagnosis and recovery processing when the system is down. This effect becomes greater as the number of secondary stations increases.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams of the principle of the present invention, Figure 3 is an explanatory diagram showing the state during normal operation, Figure 4 is an explanatory diagram showing the state during bypass, and Figure 5 is an explanatory diagram showing the state during bypass. Flowchart showing the next station failure detection procedure, Figure 6 is a circuit diagram showing the configuration of the switch unit, Figure 7 is an explanatory diagram of various states and their switch setting procedures, Figure 8 is a block diagram showing the configuration of the data processing unit. , FIG. 9 is a block diagram of a conventional loop type data transmission system, and FIG. 1O is an explanatory diagram showing the flow of data in various states. In Figures 1 and 2, 10 is a secondary station, 11 is a switch section, 1
2.14 is a synchronization check section, 13 is a data processing section, 20
．． 20A and 20B are transmission lines.

Claims (4)

[Claims] (1) A primary station and a plurality of secondary stations are connected by a loop-type transmission line, and each secondary station has a switch unit (11) inserted into the transmission line to input and output transmitted data, and a data processing unit. (13
) and a synchronization check unit (12) that checks input data to the data processing unit, the secondary station is configured to have the secondary station check the output data of the data processing unit. A second synchronization check section (13) is provided to perform the synchronization check section, and the switch section is arranged so that the output data of the data processing section is sent to the second synchronization check section when the transmission data is only input and no output is performed. 1. A self-diagnosis method for a secondary station, characterized in that the second synchronization check section performs a self-diagnosis by setting the secondary station to a bypass mode and performing a synchronization check on output data using the second synchronization check section. (2) A self-diagnosis method for a secondary station according to claim 1, characterized in that the transition to the bypass mode is made by a command from the primary station. (3) The secondary station according to claim 1, wherein if data destruction is detected as a result of the check by the second synchronization check unit, the secondary station remains in bypass mode and shuts down. Self-diagnosis method. (4) The loop type transmission line is a duplex system of a working system and a protection system, and the second synchronization check section is connected to the protection system during normal operation. Secondary station self-diagnosis method.