JPS62220031A - Inter-system communication system - Google Patents

Abstract

PURPOSE:To prevent a fault diagnosis of one system from being affected on the other system by disconnecting the other system from a communication path by the operation of an inter-system communication equipment of one system and applying the fault diagnosis in the state. CONSTITUTION:An inter-system separation means 5 for disconnecting the other system from an inter-system communication path 2 by the start of one system is provided. At the fault diagnosis, the inter-system separation means 5 of one system disconnects the other system (#1) from the inter-system communication path 2 and an own-system reception permission means 7 allows the reception of the signal transmitted to the inter-system communication path at one system (#0) via an interface 6. In this state, when test data sent from the inter-system communication equipment 3 of one system is returned to the equipment 3, an answer signal from an answer signal generating means 8 is transmitted to the communication equipment 2 and this signal is returned again to the equipment 3. The fault diagnosis is applied by comparing the said test data and a received answer signal.

Description

[Detailed description of the invention] [Summary] Central processing! In a redundant system in which information is exchanged between ltn through inter-system communication devices connected by one communication path, in order to easily identify one or more points when diagnosing an abnormality in the system, The other system is disconnected from the intersystem communication path by the action of the intersystem communication device of the system, and abnormality diagnosis of the system can be performed in this state.

[Industrial application field]

The present invention relates to a communication system between duplexed systems as a so-called active system and a standby system in order to improve the reliability of the information processing system. Specifically, the present invention relates to a communication system between duplexed systems as a so-called active system and a standby system. The present invention relates to an inter-system communication system in which inter-system communication devices are connected to each central processing unit connected by an inter-system communication device.

[Conventional technology]

For example, an information processing system that requires particularly high reliability, such as an electronic exchange Ja, is equipped with two sets of central processing units, one of which operates as an active system and the other on standby as a standby system. A so-called duplex configuration is adopted. and,
In such a duplex configured information processing device, 1
For example, information is exchanged between each central processing unit, such as transferring a program from the active system to the standby system at the time of system startup.

Here, the basic configuration of the communication system relating to information exchange between the respective central processing units is shown in FIG.

In the figure, 20 is the active system, 30 is the backup system, and the active system 20. The standby system 30 is a central processing unit (hereinafter referred to as CPU).
) 21.31, and an intersystem communication device (hereinafter referred to as
It has a configuration with 22.32 (referred to as CCU). The CCUs 22.32 in each prefecture 20.30 are connected by the following communication paths. That is, a data line 41 for transferring data (including parity information, etc.) from the active system 20 to the backup system 30;
An order of 2 bits for transferring information that specifies whether or not the data sent from to the backup system 30 is true data! 1
142, a timing signal line 43 for providing a synchronization signal from the active system 20 to the protection system 30. A 2-bit answer line 44 for transferring a response signal from the protection system 30 in response to an action from the active system 20. and other control signal lines 45.

In the above system, information exchange between the CPUs 21, 31 is carried out by the CCUs 22, 32 connected by the above communication paths.

[Problem that the invention seeks to solve]

By the way, in the intersystem communication system as described above, when diagnosing a system abnormality or the like, even if an abnormality is found, it is difficult to specify the location of the abnormality.

This is because one system and the other system are integrated via a communication path, and diagnosis can only be performed on the entire integrated system.

Therefore, an object of the present invention is to enable abnormality diagnosis of only one system to be performed independently without affecting the other system.

[Means for solving problems]

As shown in FIG. 1, the present invention facilitates information exchange between the active system (#0) and the standby system (#l).

The system is based on a redundant system that operates through intersystem communication devices 3゜13 connected by communication path 2. In this system, the technical means to solve the above problem is to start up one system and start the other system. an inter-system separation means 5 for separating the signal from the communication path 2 between the systems; a self-system reception permitting means 7 for returning a signal sent from one system to the communication path 2 so that the signal can be received by the one system; Communication path 2 between the systems is created by creating a response signal to be sent by the other system, which is the receiving side, in response to predetermined information sent from the system.
and a response signal generating means 8 for sending out a response signal.

[Effect]

When diagnosing an abnormality, the inter-system isolation means 5 of one system (#0) separates the other system (#l) from the inter-system communication path 2, and the self-system reception permitting means 7 One system (#0) of the signal sent to the communication path between systems
) to allow reception. In such a state, when the intersystem communication device 3 of one system (#0) sends test data to the communication path 2 via the interface 6, this test data is transferred to the other system (#l). Instead, it is returned to the intersystem communication device 3 of the one system (#0). Then, a response signal for the test data is sent from the response signal generating means 8 to the communication path 2, and this response signal is returned to the intersystem communication device 3 of the one system (#0).

Here, by comparing the test data and the received response signal, an abnormality diagnosis of the one system (#0) is made.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings.

The basic configuration of the entire system is the same as that shown in FIG.

First, in a normal state, each intersystem communication device 22.32 is configured as shown in FIG. 3, for example. That is, at the interface 24 in the intersystem communication device 22 on the active system 20 side,
Communication path related to transmission, specifically data line 41. Order line 42. Receiver 52 for timing signal vi43
The driver 54 for the answer line 44 enters a high impedance state and is disconnected from each communication path, while the interface 34 in the intersystem communication device 32 on the standby system 30 side Communication paths, specifically data lines 41, order lines 42.
The driver 61 for the timing signal line 43 and the communication path related to transmission, and the receiver 63 for the answer line 44 at weight A enter a high impedance state and are separated from each communication path. In this state, when the intersystem communication device 22 of the active system 20 sends a data signal etc. to each communication path (41, 42, 43, etc.) via the driver 51 of the interface 24, the intersystem communication device 32 of the backup system 30 takes in the 5p data signal etc. via the receiver 62 of the interface 34, and then the intersystem communication device 32 which is the receiving side
Then, the inspection circuit 35 decodes the data signal taken in, and based on the result, the answer generation circuit 36 generates and sends out a response signal. This response signal is, for example, 2 bits (ANS O, ANS 1) and indicates the information shown in the table below.

As shown in the table above, when a response signal is output from the answer circuit 36, this response signal is sent to the answer line 44 via the driver 64 of the interface 34, and further to the active system 20.
The intersystem communication device 22 of the receiver 5 of the interface 24
3, the intersystem communication device 22 moves to the next process based on the received response signal. For example, if the response signal is "no answer", a system abnormality is recognized and some abnormality processing is performed, if it is "normal", the first sequence is executed, and if it is a "parity error", it is abnormally terminated.

If it is "busy", the processing will be retried.

In the above-mentioned normal case, the intersystem status at the time of abnormality diagnosis is as shown in FIG. 4, for example, and the abnormality diagnosis processing in the active system 20 is performed as shown in FIG.

First, the diagnostic mode register 27 is set to 0', and the state between the systems is changed as in the normal case shown in FIG. (ST l , 5T2).

Here, if the response signal is "normal" as shown in the table above, it is recognized that the entire system is normal, and the process proceeds to the subsequent normal processing (ST7).

On the other hand, if the response signal is not the above-mentioned "normal", 1" is set in the 1 diagnostic mode register 27. Then, this 1-bit data is sent to the control line 45a via the driver 55 of the interface 24, and this 1-bit data is When the intersystem communication device 2132 on the standby system 30 side receives the data through the receivers 65 and 66 of the interface 34, all the drivers 61a, 61b, 64 and receivers 62a, 62b, 62a, 62b, and
63 enters a high impedance state, and this interface 34 is separated from the communication path between systems. Also,
On the active system 20 side, all the teno drivers 51a, 51b, 54 and receivers 52a, -52b, 53 of the interface 24 in the intersystem communication device 2!22 become valid according to the l-bit data, and are sent from the own system to the communication path. The system is now able to receive the received signal. In this state, test data is sent from the drivers 51a and 51b of the interface 24 to the data line 41 and order line 42 (
ST3) Then, the sent test data is sent to the preliminary system 3.
It is not taken into 0 and is sent directly to the receivers 52a and 52b.
In the intersystem communication device 22, the inspection circuit 25 decodes the returned data signal, and based on the result, the answer generation circuit 26 generates and sends out a response signal. Here, the answer generation circuit 26 is similar to the answer generation circuit 36 of the 2i32 manufactured by Intersystem Communication Co., Ltd. in the backup system 30 described above, and its response signals are as shown in the table above.

The response signal output from the answer circuit 26 is sent to the driver 54.
This response signal is also sent back to the own system via the receiver 53. Then, on the active system 20 side, an abnormality diagnosis is performed based on the sent test data and this returned response signal. For example, if the response signal is "normal", the current system 20 side
is normal, and the abnormality in the above normal state is caused by the backup system 3.
It is recognized that the problem is caused by an abnormality on the 0 side or a short circuit in the communication path (Sr1), and if the response signal is not "normal", the abnormality in the normal state is detected by the active system 20.
It is recognized that the problem is caused by an abnormality on the side or a disconnection in the communication path (Sr1). From then on, trouble handling corresponding to the recognized cause is performed.

As described above, according to this embodiment, by cutting l" in the diagnostic mode register 27 of the intersystem communication device 22 in the active system 2o, each driver of the interface 34 in the intersystem communication device 32 on the standby system 30 side Since the receiver is placed in a high-impedance state and disconnected from the communication path between systems, and all the drivers and receivers of the interface 24 on the active system 20 side connected to the communication path are enabled, abnormality diagnosis of the active system 20 itself can be performed in advance. This can be done without affecting the system 30.

〔Effect of the invention〕

As described above, according to the present invention, the intersystem communication device of one system disconnects the other system from the intersystem communication path and determines the status of the other system. Since abnormality diagnosis of one system can be performed suddenly, abnormality diagnosis of one system does not affect the other system. Therefore, when diagnosing abnormality of the system, it is possible to diagnose abnormality of one system. Identification becomes easier.

[Brief explanation of drawings]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a flowchart showing the flow of processing during abnormality diagnosis, Fig. 3 is a diagram showing the normal intersystem state, and Fig. 4 is the intersystem state during abnormality diagnosis. The figure shown in FIG. 5 is a diagram showing the basic configuration of the system. 1.11...Central processing unit 2...Communication path 3.1
3... Inter-system communication device 5... Inter-system separation means 6.14
...Interface 7...Self-system reception permitting means 8...Response signal creation means

Claims (1)

[Claims] Information exchange between the active system (#0) and the backup system (#1),
an intersystem communication device (3) connected by a communication path (2);
(13) In a redundant system, activation from one system connects the other system to the communication path between the systems (
system separation means (5) for separating from the communication path (2); and self-system reception acceptance means (7) for looping back signals sent from one system to the communication path (2) so that the signals can be received by that one system.
), and a response in which the other system, which is the receiving side, creates a response signal to be sent out in response to predetermined information sent from one system, and sends it to the communication path (2) between the systems. An inter-system communication system characterized by comprising a signal generating means (8).