JP2596066B2 - Line abnormality recovery method for remote monitoring and control equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of the Invention The present invention relates to a method in which a plurality of master stations and a number of slave stations are connected by a loop line for each master station. The present invention relates to a remote monitoring and control device having a flow group configuration for restoring a communication function by changing affiliations, and more particularly to a recovery method for a temporary failure of a line.

B. Summary of the Invention The present invention relates to a circuit abnormality recovery system in which each post determines a loop line temporary failure and a continuous failure based on whether or not the signal for detecting a line abnormality location can traverse to recover from a temporary failure. By determining whether or not the signal can be traversed for each space cycle, erroneous fault determination due to noise mixed into the line is eliminated and quick fault recovery is obtained.

C. Prior Art FIG. 2 shows an example of a line configuration of a remote monitoring control system having a flow group configuration. FIG. 3A shows a normal state of the line. Three master station 1 ₁ to 1 ₃ to the nine positions slave station 2 ₁ to 2 ₉ is coupled belonging to each one parent station 1 ₁ to 1 ₃ in three loop lines 3 ₁ to 3 _3. The loop lines 3 ₁ to 3 ₃ transmitted and received data is cyclically in one direction (indicated by arrow), the slave station 2 _4, 2 ₇ is the operation of the terminal mode belonging to both loop lines, except those予局slave station 2 _1, 2 _2, 2 _3, 2 _5, 2 _6, 2 _8, 2 ₉ is the operation of the relay mode.

Also, in the terminal mode, a person who makes contact with the master station is called a main group, and a person who does not make a contact is called a joint group. Similarly, in the relay mode, a person who communicates with the master station is called a master system, and a person who does not communicate with the master station is called a slave system.

In such a configuration, in the case of a transient fault in which a transmission / reception signal is temporarily destroyed or disappeared due to noise or the like, a fault recovery process is executed while maintaining the line configuration. Further, the abnormal continuous line such as a line disconnection to restore the communication function for all slave stations by changing the affiliation of the slave station for each loop lines 3 ₁ to 3 _3.

FIG. 2 (B) is the slave station 2 ₁ and 2 ₂ between continuous line abnormality indicates the line configuration deformed state midway by the slave station 2 ₁ and 2 ₂ are line abnormality changed from the relay mode to the terminal mode From the healthy circuit. However, in this state, since the slave station 2 ₂ not connected to any master station, no communication function for the slave station 2 _2. FIG. 2C shows an example of a line configuration state after the communication function is restored. Shows the recovery line configuration when it is determined that the figure (C) in the slave station 2 ₁ and between 2 ₂ line abnormality, the loop line and the slave station 2 ₁
3 ₁ belongs to master station 1 ₁ , slave stations 2 ₂ and 2 ₃ are master stations via loop circuit 3 ₂
Belong to 1 ₂

Hereinafter, a communication method between the posts (master station and slave station) and a conventional processing method when a failure occurs will be described in detail with reference to FIGS. 3 and 4. FIG.

First, the communication system normally uses one of a synchronous code and a fixed code.
One of the free token signal (Fig. 4 a) loop circuit 3 ₁ -
3 ₃ allowed to respectively cyclically, the transmission data post having the communication data which followed the busy token signal with switching to the synchronization code and definite busy token signal the free token signal when it receives a free token signal ( FIG. 4 b) is sent to prohibit the transmission of other posts in a busy token cycle.

This normal processing is performed on the path between the failure detection unit 10 and the normal operation processing unit 20 in FIG. That is, the presence or absence of a change in the signal received from the loop line (S11),
The received signal is determined to be a valid busy token or free talk by determining that the signal has a token (S12), determining whether the signal is a busy token (S13), and determining whether the signal is a free token (S14). Check that it is Then, in the busy token reception, it is determined that the data following the busy token is not a decomposition code (FIG. 4d), a decomposition prevention code (FIG. 4e), or a clear signal (FIG. 4f) (S21). The received signal is relayed (S23) under the condition that the post is not transmitting (S22). Also, when receiving a free token, the presence / absence of transmission data is checked in the self-post (S24). When there is no transmission data, the free token is relayed (S23). At the end of the transmission (S26), the free token is injected (S27).

Next, a transient communication abnormality process will be described. In the failure detection section 10, the absence of a change in the received signal (S11) is managed by a timer in the temporary failure processing section 30.
It is checked whether or not a time longer than 3 seconds (here, set to 1.5 seconds) is exceeded (S31), and the time exceeds the set time and a second set time (temporary failure and continuous failure is temporally determined). (S32), the continuous zero code (FIG. 4c) is transmitted to the loop line (S3).
3). By this continuous zero sign injection, the post downstream does not include a token (S12). It is switched whether or not the missing signal is detected for the received signal (S34). When the token is not missing, the continuous zero sign is checked (S35). ), A continuous zero code is injected by detecting the code (S33). The continuous zero sign in each post causes the loop line to be filled with the continuous zero sign. On the other hand, when a missing token is detected for a received signal that does not include a token (S12) (S34), when the detection time is transient and not continuous (S34).
In 36), the post with the shortest detection time as a transient fault injects a free token (S37). This minimum time is
Each post is assigned as a detection time at the time of occurrence of missing token, and the post having the shortest time injects a free token in place of the continuous zero code. By the injection of the free token, the circulation of the free token starts on the loop line, and the loop line configuration is kept in the normal state to obtain the recovery from the transient failure.

In the temporary failure processing unit 30, when the failure is not busy or free in the failure detection unit 10, that is, when the token is defective (S14), this detection continues for a predetermined number of times (seven times in this example) of the received signal. It is determined whether or not to perform the process (S38). If the number of times does not reach the predetermined number, the received signal is relayed as it is (S39). Until the number of times the token failure becomes 7 or more reaches 4 (S4
0), the token is converted into a free token and injected (S41). By such processing, recovery processing for temporary disappearance and destruction of the token due to noise or the like is intended.

In the above-described temporary failure processing, steps S32, S36,
In S40, it is determined that the failure is not a temporary failure, and the process enters the continuous failure processing shown in FIG. 3 (B).

In the figure, the fault localization processing unit 50 sets the continuous fault detection (flag) (S51), determines whether the self-post is currently in the relay mode or the terminal mode (S52), and leaves the relay in the terminal mode as it is. If it is the mode, the mode is switched to the terminal mode, and the clear signal (FIG. 4f) is injected into the healthy line side (S53). As a result, the post closest to the fault occurrence site is, for example, when the point P in FIG.
2 ₂ separates one of failed line unit is the terminal mode, injecting a clear signal to the post 2 ₃ side become healthy line side.

Then, post 2 ₂ fault line side that became the terminal mode (S5
For 4), a decomposition code is injected every predetermined time (1.3 seconds in this example) (S55). Post 2 ₁ which received this decomposition code
Checks whether it is in the relay mode (S56), switches to the terminal mode in the terminal mode in the terminal mode, and injects the sound line side post ₁₁ clear signal (S5).
7). As a result, the location of the faulty line (point P in FIG. 2) is separated from the loop line, and the fault localization in the state shown in FIG. 2 (B) is obtained.

In this lesion localization process, post 2 _2, 2 ₃ is in an isolated state that does not belong to any of the master station, the determination by step S58 in step S54 and the post 2 ₁ side of the post 2 _2, 2 ₃ side For the healthy line side, the isolation and line restoration processing unit
The processing by 60 is performed.

In the state of FIG. 2 (B), post S ₁ and S ₂ which is changed from the relay mode to the terminal mode healthy line 3 ₁ and using 3 _X current mode reported from each post (relay or terminal) (S61). After this mode report, it is checked whether the post is in a healthy line state and the terminal mode designation is the relay mode designation (S62). In this check, post 2 _2, 2 when ₃ is a relay mode the current mode is checked whether the terminal mode or the relay mode (S63), the post 2 ₂ main system when in the terminal mode, the slave Check whether there is received abnormal in any (S64), the post 2 ₁ and 2 ₂ for which the reception error point P performs mode designation remains in terminal mode (S65), the post 2 ₁ and 2 ₂ is kept in terminal mode. Moreover, the post 2 ₃ is not a terminal mode specified (S62), nor in the terminal mode (S63) the main system, since there is no even reception error in any of the slave, and remains relay mode after the check of step S76 (S77 ). Also post 2
_In step ₄ , the terminal designation is checked in step S62, and the terminal is currently in the terminal mode (S68) and there is no reception error in any of them (S6
9), also without a parent station 3 _X line side (S70), there are young numbered terminal (post 2 ₂₎ (S71), switching the relay mode by further reception abnormality in the post 2 ₃ (S72) ( S7
Five).

By such processing, post 2 ₁ belongs to the master station 1 _1,
Post 2 _2, 2 ₃ are configured in a loop line belonging to the master station 1 _2, isolated eliminated is realized as shown in FIG. 2 (C).

Steps S79 to S82 and others show the mode report and the processing for the remaining posts such as the post ₂₅ , and the line recovery processing at the time of failure recovery described later.

Next, when the fault such as disconnection of the loop line is recovered,
The detection by the failure recovery detection unit 70 and the processing by the isolation / line recovery processing unit 60 based on this detection are performed. Fault recovery detection, post 2 ₂ in the state of FIG. 2 (C) has transmitted the decomposed sign post 2 _1, also relaying degradation signs post 2 ₁ also received (S91). For this decomposition code, post 2
_{In the case of} No. 2, no decomposition code was received due to an abnormality at the point P (S92),
In step S55, the decomposition code is injected every 1.3 seconds. In this state, when the fault recovery at the point P is performed,
Post 2 ₂ receives the decomposed code (S92), determines that the failure recovery Reset flag ongoing fault detected (S93).
Thus, the post 2 ₂ stops the degradation code injection, to post 2 ₁ eliminates the reception decomposition code (S94), detects the failure recovery.

By detecting the failure recovery at these posts 2 ₁ and 2 ₂ , lines 3 ₁ and 2
The mode is reported in 3 ₂ , 3 _Y and the isolation and line recovery processing unit 6
By returning 0, the loop line is returned to the original line state shown in FIG. This process, post 2 _1, 2 to ₂ step S62 →
Return to the relay mode via the route of S63 → S64 → S66 → S67. Also,
The post 2 ₃ leave the relay mode in the path of step S62 → S63 → S76 → S77, the post 2 ₄ Step S62 → S68 → S7
The relay mode is maintained in the route of 9 → S80 → S81. Here, post 2 ₁ , 2 that changed from terminal mode to relay mode
The ₂ mode reported is performed from the post 2 ₁ to 2 ₆ is in every relay mode, turn out that it is now configured with the master station 1 ₁ and 1 ₂ of the two master station from the mode reports each post. For this reason,
Step for post _{2 4 S62 → S68 → S79 →} S80 → S82
To return to the terminal mode by the route of (2) to eliminate the existence of the two master stations. Also, steps S62 → S63 → S76 are added to posts ₂₅ to _26.
→ Keep the relay mode in the route of S77. By such processing, the loop line state is returned to the original state shown in FIG.

D. Problems to be Solved by the Invention In the conventional fault recovery method, in the temporary fault processing, a continuous zero code is injected into the received signal without any change for a fixed time (steps S31 and S32) (S33). The loop line is filled with the continuous zero code by code injection, and the free token is returned to the original free token loop by free token injection (S37) from the shortest time post of the token missing detection with respect to the missing zero code of the token.

In such temporary fault processing, there is a problem that incorrect processing occurs when noise is mixed in the continuous zero code. For example, if the point P in the state of FIG. 2 (A) fails, the post 2 ₂ does not receive a token code, S11 → S12 → S13 → S14
→ S24 → S23 → S11 is to inject successive zero symbols with ...... routes broken is S11 → S31 → S32 → S33 → S11 in the loop, the continuous when the secondary failure of contamination such as noise occurs in _two points P The zero sign is disturbed,
After repetition of the post 2 ₃ In S11 → S31 → S11, S11 → S12 → S
34 → S35 receives the continuous zero codes with the noise reached the post 3 ₃ without advancing the to S33 by the reception, S11 → S12 → S34 → S35 → S11 repeats the loop processing, performed injection consecutive zero code Disappears. As a result, post 2 ₄ S11 → S31 → S32 → S33 → While injecting successive zero code in S11 of the loop, at step S32 for longer than the 2.8 seconds to mistaken continued failure P ₃ points, recovery from the temporary failure Fails. Moreover, because of the mistaken continued disorder, post 2 ₄ injects decomposed symbols to the post 2 ₃ side because it is the terminal mode (S55), the post by the post 2 ₃ be a terminal mode (S56 → S57) Post 2 ₃ 2 ₄ lesion localization between is performed, to perform judgment and obstruction localization of erroneous line abnormality location, then 2 ₃ -2 2 ₄ does not originally failure between ₄ S92 → S93,2 ₃ is S91 → S94 in the cause of the relatively long time communication impossible to enter the continued continued failure recovery process becomes a form of disaster recovery.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reliable line abnormality recovery system that does not perform erroneous processing even when noise is mixed in a continuous zero code used for detecting a line abnormality location.

E. Means and Action for Solving the Problems In order to achieve the above object, the present invention provides a method in which a plurality of master stations and a number of slave stations are connected by a loop line for each master station, and the loop line becomes abnormal due to an abnormal state. Each post receives and injects a signal for detecting a line abnormal location, and determines whether a temporary failure or continuation failure of the line is determined based on whether or not the signal can continue to traverse the circuit. In the remote monitoring control device that recovers the communication function by changing the assignment of the slave station to each loop line in the determination of the continuous failure, the signal change-free time is preset when the failure of the received signal is determined. When the time exceeds one set time and the time is within the second set time, a continuous signal having a space period determined by the time required for code detection is generated, and each post discriminates the signal for each space cycle. If the signal is temporarily mixed with noise by repeating the reception determination of the signal for detecting a line abnormality location in the space cycle, the signal to be received next time is determined. To determine correctly.

F. Embodiment FIG. 1 is a flowchart of a main part process showing an embodiment of the present invention. 3A is different from FIG. 3A in that the process of injecting a continuous zero code periodically having a space of a fixed time when no signal is continued for 2.8 seconds or more in step S32 (S4).
2) is added.

The temporary failure processing by this configuration will be described in detail below.

Second in the normal line configuration of Figure (A), when the failure of the point P no signal above 1.5 seconds post 2 ₂ occurs, the post 2 ₂ S11 → S32 → S42 → S11 in the loop Then, injection of a continuous zero code having a space periodically (eg, every 0.4 seconds) is started (S42). Post 2 ₃ that has received the continuous zero code, S11 → S31 → S11 → S12 → S34 → S35 path enters the determination of the continuous zero code, without a space as in the conventional becomes continuous zero code detected by the determination Continuous zero sign injection is performed (S33). Here, a continuous zero code to receive posts 2 _3, because of its space, to discriminate successive zero codes from the space to the next space. Therefore, temporarily secondary failure P ₂ points of FIG. 2 (A) is generated, when the continuous zero code is disturbed by noise, is determined by a continuous zero code detection in space S35 in the post 2 ₃ No, the determination of the continuous zero sign starts again through the path of S35 → S11 → S12 → S34. At the time of this determination, it is expected that the disturbance of the noise due to the temporary failure at the point P ₂ will be resolved, and after 0.4 seconds in the present example, the code is detected in the re-determination of the continuous zero code starting from the space in the spare S35, injected continuously zero code without space, the injected normal continuous zero code of the received without space in the post 2 ₄ or later.

Thus, the first post 2 ₂ positions to be received from the fault occurrence point P points to inject successive zero codes with spaces at fixed intervals, updates the determination of the continuous zero code space cycle downstream post However, continuous failure processing due to code disturbance due to noise is eliminated, and temporary failure recovery processing with high noise resistance is achieved. Further, if the continuation failure is detected, the transition to the recovery processing is not continued, and the unnecessary mode transition of the post by the decomposition code by the processing is eliminated.
Enables a short recovery process.

The continuous zero sign injection having the space described above becomes a code injection with a space when the continuation of the code cannot be detected in other posts. Do. By such processing of each post, although disturbance is temporarily generated in the noise, a continuous zero code is finally filled on the loop line, and the normal communication state is restored by the injection of the free token in step S37.

Note that the space period of the continuous zero code is appropriately determined from the processing time required for detecting the code. Further, each post is not limited to generating two types of continuous zero code having a space and a continuous zero code having no space, and is configured to perform injection and reception determination of the continuous zero code having all spaces. It has the same effect.

Also, a case where a continuous zero code is used as a signal for detecting a line abnormality is shown. However, the present invention is not limited to this, and a signal having a specific pattern such as a repetition of continuous 1s and 0s may be used. good.

G. Effects of the Invention As described above, according to the present invention, a signal for detecting a line abnormal location is converted into a signal having a space cycle, and the presence or absence of reception of the signal is determined in the space cycle to detect an abnormal location and a temporary failure. Since the continuation failure determination process is performed,
Disturbances due to temporary noise contamination during circuit circulation of the signal can be correctly determined by the next signal reception, recovery processing with improved noise resistance can be performed, and communication function recovery time can be eliminated without erroneous continuous failure determination. Shortening can be achieved.

[Brief description of the drawings]

FIG. 1 is a flowchart of a main part process showing an embodiment of the present invention, FIG. 2 (A) is a line configuration diagram of a flow group system, and FIG. , FIG. 2 (C) is a configuration deformation diagram due to line abnormality, FIG. 3 (A)
3 (B) is a conventional processing flowchart, and FIG. 4 is a waveform diagram of a cyclic signal. 10: Failure detection unit, 20: Normal operation processing unit, 30:
Temporary failure processing unit, 50: Failure localization processing unit, 60: Isolated line recovery processing unit, 70: Failure recovery detection unit

Claims (1)

(57) [Claims] 1. A plurality of master stations and a number of slave stations are connected by a loop line for each master station, and each post receives and injects a line abnormality location detection signal when the loop line becomes abnormal and no signal occurs. The temporary failure and continuation failure of the line are determined based on whether or not the circuit continuation of this signal can be continued, the normal token circulation is returned by the determination of the temporary failure, and the slave station belonging to each loop line is determined by the determination of the continuation failure. In the remote monitoring control device that recovers the communication function by changing the time, when the presence or absence of the failure of the received signal is determined, the signal change-free time exceeds the first set time set in advance and is within the second set time. Generating a continuous signal having a space period determined by the time required for code detection, each post discriminating the signal for each space cycle thereof, and discriminating whether or not the signal can continue circuit cycling by this discrimination; A line abnormality recovery method for a remote monitoring control device characterized by the following.