JPH03186041A - Automatic fault deciding and switching device for communication station in local area data communication network - Google Patents

Abstract

PURPOSE:To prevent a failure in communication from being caused by a fault of the communication station by realizing full automatic operation which detects the abnormal state of the communication station in operation and also put a stand-by communication station in operation immediately. CONSTITUTION:When source voltage monitor parts 51-5m output a single or plural abnormality signals, a single or plural priority codes which specify a communication station in an abnormal state are generated. Those priority codes are delayed in order as the codes increase in number and the single or plural priority codes which are delayed and inputted one after another are compared with priority order codes of stand-by communication stations which are stored in a RAM 7 in order. Then a priority code which is right above it is detected in order and inputted as a command signal for operation to the stand-by communication station corresponding to the compared and detected priority code. Consequently, the failure in communication at the time of the abnormality state generation is precluded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention detects a failure of a communication station connected to a data line of a local area data communication network (1, AN) and establishes a standby communication station. The present invention relates to a failure determination switching device for a communication station that operates in a fully automatic manner.

[Conventional technology]

Data lines installed within the same building or the same factory are
In addition to connecting terminal devices such as word processors, facsimile machines, printers, and image file devices, the transmitter/receiver is connected to a communication station that serves as a master station that controls communication protocols, thereby allowing data transmission and reception between terminal devices. The aim is to create a communication network that can perform the following tasks, thereby significantly improving office processing efficiency and productivity.

In this type of local area network (LAN), if a failure occurs in which the tBt pressure applied to the communication station run is cut off, the operator confirms the operation of the alarm device installed in parallel, and manually disconnecting the communication station from the data line, then activating the backup 1ffi communication station connected to the data line,
This is intended to restore the illumination network function.

[Problem to be solved by the invention]

Conventionally, the recognition of the occurrence of an abnormal state in the i-Station and the operation of the standby communication station are performed by the operator and manual operation, which inevitably involves a time delay. This results in a problem in that it takes a long time to start up the recovery of the network's communication function, and the data processing of the communication network is temporarily interrupted, resulting in a loss of reliability.

The present invention has been made in view of the above-mentioned problems, and its purpose is to fully automatically detect an abnormal state of an operating IL communication station and to immediately activate a standby communication station. An object of the present invention is to provide an automatic failure determination switching device for a communication station in a local area data communication network, which can prevent the occurrence of 1ffi failure due to a failure of a communication station.

[Means to solve the problem]

The characteristics of the present invention are as shown in the fI diagram of the invention in FIG. In a local WI area data communication line comprising a communication station for a communication station, an abnormal state detection means connected to each communication station run, and a priority code for generating a priority code corresponding to a communication station based on a detection signal from the abnormal state detection means. A priority code generating means, a delay means for outputting the output signal from the priority signal generating means with different delay times, and a storage means for storing the priority code of the communication station corresponding to the standby communication station. The priority code output from the delay means and the priority code stored in the storage means are compared, and when the priority code of the backup i11 signal station to be operated is detected, the priority code detected by comparison is and a priority comparison means for inputting an operating command signal to a standby communication station run corresponding to the standby communication station.

[Effect]

Constantly monitors a single or multiple communication station run connected to a data line for abnormal conditions,
When an abnormality is detected, a priority code of this communication station is generated, this code is outputted sequentially with a certain delay time, and this priority code and a backup communication stage are output from the storage means. sequentially compares the priority code of the standby communication station to be operated, detects the priority code of the standby communication station to be operated, and inputs an operation command signal to the standby communication station corresponding to this priority code. put it into operation.

[Example] Hereinafter, an example of the apparatus of the present invention will be described with reference to the drawings.

FIG. 2 shows an embodiment of the apparatus of the present invention, in which a loop-shaped television line 1 is equipped with a transmitter/receiver and a terminal device sI such as a processor, a personal computer, a facsimile machine, an image file device, or a printer. , S2...Sn are connected in series to monitor and control a communication protocol. A large number of communication station runs Ml, M2, M3...Mm are connected in series in a loop, and among these, for example, only the communication station run M1 or communication stations M1 and M2 are connected. is activated, while the remaining communication stations M2 to Mm or M3 to Mm
is connected as a backup device for the bank amplifier. The communication stations Ml to Mm are each connected to a separate power supply system (not shown) in order to ensure reliability of the power supply. The communication stations M1 to Mm have
Lead wires 21, 22, 23, . . 2 m for power supply voltage monitoring connected to the CPU 4, which will be described later, and leads &*31, 32, 3 to which command signals for operating the communication station are applied.
3...3m are connected.

Priority codes 1.211m corresponding to the communication stations ML M2, M3, . . . Except for the rank number, there are 3 spare stations M2 to M
A RAM 7 in which only codes corresponding to m or M3 to Mm are stored via a human-powered device (not shown) is connected to a ROM 8 in which a control j'B program is stored. In addition, the i-functions of this CPU 4 are shown for each block. The lead wires 21, 22, . Connected and communicating stage Kun Ml
, M2, M3 . . . Mm, the power supply voltage monitoring unit 51.52. 53...5m and ROM as described later
The priority level corresponds to the power supply voltage monitoring unit that operates according to the program stored in the power supply voltage monitoring unit 8, receives the abnormality detection signal from the power supply voltage monitoring unit 51, 52, 53, . . . 5m, and generates the abnormality detection signal. Compares the priority code of the communication station for backup code B, detects the priority code that is immediately higher than the priority code set for the communication station run that is in an abnormal state, and activates the corresponding communication station run. The priority determining unit 6 has a function of inputting command signals for use.

In the above ROM8, ' is the source voltage monitoring section 5L52.5.
When a single or multiple abnormality signal is output from 3...5m, a single or multiple priority code is generated to identify the communication station in the abnormal condition, and this priority code is then incremented by a code increment. The single or multiple priority codes input one after another after the delay are sequentially compared with the priority codes of the standby communication station run stored in the RAM 7, and the most recent priority code is It is programmed to sequentially detect certain priority codes and input them as operating command signals to the standby communication station corresponding to the comparatively detected priority codes.

Furthermore, when this command No. 13 is output, the comparatively detected priority code will be stored in the RAM 7 when the next abnormality is detected.
A program for inhibiting the RAM 7 from being outputted is also stored.

The operation of the apparatus configured as described above will be explained with reference to the flowchart shown in FIG.

When operating only communication station M1, first R
AM7, communication station run Ml, M2, M3...Mm
After storing the remaining codes 2...m excluding the priority code l of the operating communication station Ml among the priority codes l, 2.3...m corresponding to the communication station Ml (step 31), the communication station Ml and control the communication protocol. The T4 source lightning voltage viewing unit 51 monitors the power supply voltage applied to the communication station M1 (step 32). When an abnormal state occurs in the power supply voltage of the communication station M1, the T4 source lightning voltage viewing unit 51 monitors the power supply voltage applied to the communication station M1. The power supply voltage monitoring unit 51 outputs a detection signal indicating the occurrence of an abnormal state (step 33).

As a result, the priority code 1 of the communication station Ml is output (step 34), and after a set delay time (step 35), a signal indicating this code is sent to the RAM.
In step 36), the communication corresponding to code 2 is compared with the priority code 2.3...m of the standby communication station stored in step 36) to detect priority code 2, which is the immediately higher priority code of code 1. stage! A command signal for operation is generated for the IM2 (step 37), and this is sent to the communication station M2 via the lead wire 32 to activate it, thereby instantly restoring the communication function to the data line &11. , disconnects the communication stage ten M1 in the abnormal state from the data line 1, and performs prohibition control so that the priority code 2 stored in the RAM 7 is not output when an abnormality is detected again.

When the communication station run Ml and M2 are operated simultaneously and the communication station run M3...Mm is used as a backup,
Reserve communication stage in RAM7! 17 M 3...M
priority code 3...m of communication station M1 and M2 is stored, and if an abnormality occurs in the T4 source voltage of either communication station M1 or M2, the process is carried out in the same manner as described above, but both If an abnormality occurs in both, the power supply voltage monitoring units 51 and 52 detect this and generate priority codes 1 and 2 for the communication station MiM2. 7'f issue! , 2 are output one after another with different delay times, but the code l output first is compared with the priority code 3...m stored in the RAM 7, and the immediately higher code 3 is detected and passed. ) Operate ε stake 3 manually, and disconnect communication station run M1 from data line l. Then, prohibition control is performed so that priority code 3 is not output from the RAM 7. Further, the code 2 outputted with a slight delay from the code l is compared with the priority codes 4, . . . A command signal for operation is input to station M4, and it is operated. Similarly, communication station M2 is disconnected from data line i, and prohibition control is applied to RAM 7 so that priority code 4 is not outputted again.

In this embodiment, a case has been described in which an abnormality in the power supply voltage applied to a communication station is detected.
i! It is also possible to constantly monitor the control state of the communication protocol and to switch the operation of the 1J11 communication station when an abnormality is detected in the control signal waveform.

Furthermore, the detection of the priority order is not limited to the case of the immediately higher order, but it is also possible to detect the immediately lower order.

〔Effect of the invention〕

As described above, according to the present invention, the abnormal state detecting means connected to each communication station and the priority code that generates the priority code corresponding to the communication station by detection from the abnormal state detecting means (No. 8) generating means, delay means for outputting output signals from the priority code generation means with different delay times, storage means for storing priority codes of standby communication stations among the communication stations, and delay means. The priority code output from the storage means is compared with the priority code stored in the storage means, and when the priority code of the standby communication stage kin to be operated is detected, the standby code corresponding to the priority code detected by comparison is detected. Since the configuration is equipped with a priority comparison means for inputting a command signal for operation to the communication station run, the operation from detecting an abnormal state of the communication station in operation to operating the standby communication station can be fully automated. This makes it possible to instantly restore the communication function of the data line in the event of an abnormality, thereby preventing 1ffi communication from being lost in the event of an abnormality. It has a remarkable effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a circuit diagram of an embodiment of the apparatus of the present invention, and FIG. 3 is a flowchart of an embodiment of the apparatus of the present invention. 1...Data line, 21 to 2m and 31 to 3m...Lead wire, 4...CPU, 51 to 5m...Power supply voltage monitoring unit, 6...Priority determination unit, 7...RAM, 8 - -
ROM, S 1 to Sn = terminal device, Ml to Mm・
・Communication station, applicant: Shimizu Corporation, sub-agent patent attorney Ryukichi Abe (6 others) Figure 1 Figure 2

Claims (1)

[Claims] In a local area data communication network comprising a terminal device connected to a data line, a single or multiple active communication stations that perform communication control, and a plurality of standby communication stations, each of which is connected to the above communication station. an abnormal state detecting means for detecting an abnormal state, and a priority code generating means for generating a priority code corresponding to the communication station based on a detection signal from the abnormal state detecting means;
delay means for outputting the output signal from the priority code generation means with different delay times; storage means for storing priority codes corresponding to standby communication stations among the communication stations; and the delay means The priority code output from the storage means is compared with the priority code stored in the storage means, and when the priority code of the backup communication station to be operated is detected, the priority code of the backup communication station corresponding to the priority code detected by the comparison is detected. 1. An automatic failure determination switching device for a communication station in a local area data communication network, characterized in that the device comprises priority comparison means for inputting a command signal for operation to a communication station for use in a local area data communication network.