JPS63276132A - Duplex system - Google Patents

Abstract

PURPOSE:To avoid the misconnection between each system and an external device by using an input/output checking device to check the input/output of a series deciding device which decide the state of each system. CONSTITUTION:A 1st series deciding device A1 decides the state information b1 and b2 on 1st and 2nd on-lines/off-lines outputted from 1st and 2nd systems S1 and S2 respectively. Then a 1st device connection request c1 is delivered to a 1st input/output checking device B1 when the system S1 is equal to an on-line system. A 1st device connection instruction d1 is outputted by the device B1 only when the information b1 is kept under an on-line state and at the same time the request c1 is outputted. Then the system S1 is connected to an external device D via a switch device C when the instruction d1 is outputted. In the same way, the system S2 is connected to the device D when a 2nd device connection instruction d2 is delivered from a 2nd input/output checking device B2.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a redundant system consisting of a first system and a second system, and particularly to a switching system for connecting an external device to an online system. This invention relates to a duplex system having a device.

(Prior art) Conventionally, as a switching method in this type of duplex system, the status of each system in the duplex system is judged by an external device, and the online status of the duplex system is determined based on the judgment result for each system. There was a way to connect external devices to the system.

(Problems to be Solved by the Invention) In the conventional method described above, for example, when a cable between a system determination device installed externally and the system is exposed, the system status output from the system and the system There is a drawback that the system state recognized by the determination device is different, and as a result, an incorrect external device connection signal is output.

An object of the present invention is to provide a duplex system that can prevent erroneous inputs to a switching device that connects external devices.

[Means for solving problems]

The duplex system of the present invention includes a first system and a second system, and in the duplex system that has a switching device for connecting an external device to the online system, each of the first and second systems The first line indicates whether you are online or offline.
and a series determination device that inputs and processes each second state information and sends out a first or second device connection request;
input processing the state information of and sending a first device connection command to the switching device, input processing the second device connection request and the second state information,
The present invention is characterized by comprising an input/output verification device that sends a second device connection command to the switching device.

[Effect]

Therefore, according to the present invention, the series determination device can determine the status of each system, and the input/output verification device can accurately grasp the status of each system, thereby preventing erroneous connections to external devices. can.

(Example) The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment according to the present invention. As shown in FIG. 1, the first system S1 and the second system S2 have a first input/output line 101 and a second input/output line i02, respectively, and a connection switching device @C. It is connected to an external device D via an intervening device. Note that 103 is a third input/output line between the external device D and the switching device C. Further, the first and second systems 81.32 are connected to each other so as to send the first and second self-system failure information al, a2 to other systems.

The first system! ASt is a first series judgment BfiffA1 and a first input/output verification device B connected in series.
1, and the second system S2 is connected to the switching device C via a second series determination device ff1A2 and a second input/output verification device @Bz, which are connected in series.

Furthermore, the first online/offline status information b1, which is the output of the first system S1, is transmitted to the first sequence determination device A1, the second sequence determination device ffA2, and the first sequence determination device A1.
is sent to the input/output verification device B1 of the second system S2.
The second online/offline state information b2, which is the output of has been done.

Next, the operation shown in FIG. 1 will be explained. The first system S1 notifies the other system of the first self-system failure information ai, and the second system S2 the second self-system failure information a2, and also indicates whether the self-system is online or offline. The determination is made internally, and as shown in FIG. 1, the online/offline first and second status information b1. b2 are output to the first and second sequence determination devices At and A2, respectively, and at the same time online/offline status information b1 of the own system is output.
, b2 are white input/output verification devices B1 and B2, respectively.
Output to.

For example, the first sequence determination device A1 determines whether each system S1
．． 82, the online/offline status information S, b2 is determined, and if the first system S1 is determined to be online, the first device connection request C1 is
is output to the first input/output verification station B1.

First input/output test%i! In i-place B T, online/
The offline first state information b1 is in the online state,
If there is a first device connection request C1, the first device connection command d1 is output, and if the first status information b1 is online and there is no first device connection request C1, the first device connection command d1 is output. If the connection command d1 is not output and the first status information b1 is in the offline state, the first device connection command d1 is not output.

ΔTsu.

The same thing is done for the second entrance/exit horn verification device ri[32. The above is summarized in Table 1 below.

In the switching device rIC, when the first device connection command d1 is output, the input/output line 101 of the first system S1
and the input/output line i03 of the external device D, and when the second device connection command d2 is output, connect the input/output 1iIi 02 of the second system S2 and the input/output line i03 of the external device D. do.

Here, to summarize the embodiments of the present invention, in a redundant system having a switch to which an online system and an external device are connected, the connection between the own system and the external device is determined based on the online/offline information of the own system and the other system. It has a function to determine, based on the input/output status of this function, it outputs the own system connection signal when the online input is used to connect to the own system, and outputs the other system connection signal when the online input is used to connect to another system. , has the function of outputting the other system connection signal when outputting the own system connection with offline input, and outputting the other system connection signal when outputting the other system connection with online input, and connects the system to which the own system connection signal is input and the external system. It has the ability to connect with devices.

〔Effect of the invention〕

As explained above, the present invention verifies the input and output of the series determination device that determines the state of each system using the input/output verification device, so the state of each system can be accurately grasped and external devices can be connected. This has the effect of preventing incorrect connection of external devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment according to the present invention. 81*S2...System, A1. A2... Series determination device, B1. B2... Input/output verification device, C... Switching device, D... External device. Figure 1

Claims (1)

[Scope of Claims] A duplex system comprising a first system and a second system and having a switching device for connecting an external device to the online system, wherein each of the first and second systems is online. a series determination device that inputs and processes first and second state information indicating whether the device is offline or offline, and sends out a first or second device connection request; The first state information is input-processed to send a first device connection command to the switching device, and the second device connection request and the second state information are input-processed to the switching device. An input/output verification device that sends out a second device connection command to the duplex system.