JPH10190711A - Remotely monitoring and controlling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate coping with when a line has been in failure and to shorten communication interruption time in the line failure. SOLUTION: When a slave station S3 does not make a response to regular communication from a master station ML when the failure occurs in a circuit block diagram showing a master station search system, it is necessary to judge the failure to be instantaneous or continuous. Thus, trial communication for the prescribed number of times is executed from the master station ML to the slave stations S1, S2.... Then, a search signal is transmitted from the master station ML to the slave station S1. A response call (both systems responses to search signal) is given from the slave station S1 by the search signal and the master station ML and the slave station S1 are judged to be normal. In the case of a sequential search system, the station S2 is normal, the slave station S3 is abnormal and a failure part is judged to exist between the slave station S2 and the slave station S3. In the case of an intermediate search system, the slave station S3 is abnormal and the slave station S2 is normal and the failure part is judged to exist between the slave station S2 and the slave station 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring and control system in which a transmission line is loop-shaped, and is used for SDLC (Synchr.
The present invention relates to a remote monitoring control method using an onous data link control method.

[0002]

2. Description of the Related Art Two remote transmission control systems, a polling system and a token ring system, are currently used in a remote monitoring and control system in which a transmission line has a loop shape. The polling method collects data by calling (polling) the slave stations in order from the master station, and the token ring method circulates a speech permission signal (token) in a loop, and the contact signal generation station arrives at the token. It is something to send when.

The polling method and the token ring method each have characteristics. Here, the difference between the two systems will be described with reference to the drawings. FIGS. 36 and 37 show the line configuration and signal flow of the polling system and the token ring system when the master station has three sets, ie, three groups of three loop lines. It is a schematic block diagram. M1, M2, M3 is the master station, in S1 ₁ to Sn ₃ is the slave station, the master station M1 in the case of the polling method of Fig. 36, M
2, the M3, when the main system M1 _S, M2 _S, M3 slave station S1 ₁ to Sn ₃ in a direction indicated by an arrow from _S, slave station with a status change poll in turn that he polled, master station Contact Note that M1 _J , M2 _J , and M3 _J are the master M
It is a slave to act in the event of a failure of the _{1 S, M2 S, M3 S} . Therefore, in the case of the polling method, the communication start waiting time is a period in which the polling signal makes a maximum of eight rounds of the loop line in a group of eight slave stations. That is, when there is only a status change in one slave station, useless polling is performed up to seven times.

In the case of the token ring system shown in FIG. 37, a token is circulated between a master station and a slave station for each loop line. The station contacts the master station when the token signal arrives. Therefore, the communication start waiting time may be at most one loop time.

[0005] In view of the above, the token ring method is better in terms of the waiting time for starting communication. However, when a state change occurs in many slave stations, useless polling is reduced and the difference is reduced. Fig. 38 and Fig. 4
0 and FIGS. 39, 41A and 41B.
Figure 38, Figure 39 respectively for polling scheme and token ring method the line configuration when a fault (illustrated × mark) is generated between the slave station S1 ₂ and S2 ₂ of 2 groups, 40, 41 is the master station The line configuration when a failure occurs in M1 and M3 is shown for the polling method and the token ring method, respectively.

As shown in FIGS. 37, 36 and 41, the term "token ring system" is used here for convenience.
There are two common points and one difference from the general token ring system.

The first common point is that the above-mentioned speech permission signal (token) is circulated, and the second common point is that the stations adjacent to the line fault (both the master station and the slave station) change the line configuration and the fault occurs. (Slave stations S1 ₂ , S2 ₂ ,
S1 _1, Sn ₃ in FIG. 41). This is called loopback.

[0008] The difference is the belonging movement of the slave station. Figure 37 →
In Figure 39, the slave station S1 ₂ is to the master station M2 → master station M1,
In Figure 37 → 41, the slave station S1 ₁ to Sn ₁ and S1 ₃ ~
All Sn ₃ belong to the parent station M2.

In the communication interruption time in the case of a line failure in both systems, no change in the line configuration is required in the polling method, and the communication interruption does not occur. However, the line configuration needs to be changed in the token ring system, and communication is interrupted during this change period. As a result, the polling method is better in terms of the communication interruption time in the event of a line failure. But,
The frequency of line failures is low. In recent years, the polling method includes HDLC (High Level Data L
ink control) method has been adopted.

[0010]

The loop-based remote monitoring and control system has two types: a polling system and a token ring system.
Two transmission control methods are used. Both of these methods have advantages and disadvantages. However, the token ring method has disadvantages that the communication interruption time at the time of a line failure becomes long and the handling at the time of the line failure becomes complicated. In addition, the polling method has a problem that transmission efficiency is deteriorated because the number of line input / output units in the master station increases and unnecessary polling is performed for non-corresponding stations.

[0011] There is a well-known "SDLC system" as a system having higher transmission efficiency in a loop line. In the SDLC method, each slave station that has received the information request signal from the master station can sequentially transmit the information if there is transmission information. Therefore, information on all the slave stations in the loop can be communicated to the master station in one loop.
The polling method and the token method described above have a great difference as compared with circulating contact information for each slave station. But,
The SDLC method is good when the line is normal, but when a line failure occurs, the signal circulating function is lost, so that measures against the line failure become complicated, and it has been difficult to apply as a remote monitoring control device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has the best transmission efficiency, makes it easy to deal with a line failure, and further reduces the communication interruption time when a line failure occurs. It is an object to provide a method.

[0013]

According to the present invention, in order to achieve the above object, according to a first aspect of the present invention, a plurality of master stations and a number of slave stations are connected by a loop line for each master station. In the remote monitoring control system that maintains the communication function by changing the belonging of the slave station to each loop line due to failure,
When the master station sends an information request to the slave station, if there is no response from the slave station that received the information request, the master station sends a cyclic contact confirmation signal, and if this confirmation signal is detected as being impossible to traverse, It is characterized by the fact that a continuous fault has occurred in the line.

According to a second aspect of the present invention, when it is recognized that the continuous fault has occurred, if communication between the master station and the adjacent slave station is not established, it is detected that a fault site exists between the master station and the adjacent slave station. If the communication is established, the communication between the master station and the 1/2 intermediate station is established. If the communication is established, the communication between the parent station and the 3/4 intermediate station is determined. It is characterized in that the determination of communication between the quarter meson stations is sequentially subdivided in order to detect a faulty part.

According to a third aspect of the present invention, when it is recognized that the continuous fault has occurred, if communication between the master station and the adjacent slave station is not established, it is detected that there is a fault site between the master station and the adjacent slave station, If it is established, it checks whether the communication between the master station and the second slave station is established or not. If it is not established, it detects that there is a faulty part between the first and second slave stations. It is characterized in that it is determined whether the communication between the second slave stations is established or not.

According to a fourth aspect of the present invention, when it is recognized that the continuation failure has occurred, a terminal transfer command is transmitted from the first master station which has detected the continuation failure to the adjacent slave station on the side of the failure site first master station, First
After confirming that the line of the master station has been normalized, the first master station contacts the second master station, and the second master station transmits a relay shift command to the terminal slave station, and the second master station. Further, a terminal transfer command is transmitted to an adjacent slave station on the side of the second master station on the failure site, and the line of the second master station is normalized.

According to a fifth aspect of the present invention, a plurality of master stations and a number of slave stations are connected by a loop line for each master station, and the communication function is changed by changing the assignment of the slave station to each loop line due to a failure in the loop line. In the remote monitoring control system to be maintained, a slave station that does not receive a signal for a fixed time or more transmits a fault search signal of the line, and a slave station that receives a fault search signal from upstream is
The transmission of the failure search signal is stopped, and when the number of times the failure search signal arrives at the master station reaches a predetermined number, it is recognized that a continuous failure has occurred in the line. is there.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, embodiments of the present invention will be described with reference to the drawings, first of all, a fault detection method in a remote monitoring control employing the SDLC method will be described. FIG. 1 is a circuit configuration diagram at the time of normal operation.
L is a first master station (master station on the left side in the figure), MR is a second master station (master station on the right side in the figure), and S1, S2 to S3, and S10 are slave stations. The first and second master stations ML, MR and each slave station S1,.
S10 is connected to transmission lines, and these transmission lines are composed of system lines L1 and L3 and system lines L2 and L4. Each line is composed of a pair of transmission lines (not shown).

The white circle of each slave station mainly has a relay function (transmits a received signal as it is). The black circle of each slave station mainly has a relay function and a communication function with the master station. Main system Note that children 1 to 4 and children 6 to 10 are called relay stations, and child 5 is called a terminal station.

In the circuit configuration diagram configured as shown in FIG. 1, four line failure patterns (faults indicated by crosses in the figure) as shown in FIG. 2 are taken as target failures. FIG.
(1) Case 1 is a target failure in the case of a single failure of the downlink 1 system line L1, and FIG. 2 (2) Case 2 is a target failure in the case of a single failure of the uplink 2 system line. 2 (3) Case 3 is a target failure in the case of a fault in the same upper and lower circuit section, and FIG. 2 (4) Case 4 is a target fault in the case of a different upper and lower section line fault.

When each line failure in FIG. 2 occurs, the information request signal from the master station is cut off at the failure part (marked by x).
(The thick line indicates the signal reaching range). That is, the communication function between parent and child is lost. In order to restore the communication function between the parent and child, as shown in FIG. 4 according to each line failure, "temporary operation" is performed until the line failure is recovered. FIG.
A dotted line indicates a signal for detecting recovery from a line failure. In this switching of the line configuration, the following conditions must be satisfied.

The first condition is that, in cases 1, 2, and 3, as shown in FIG. 4, monitoring and control of all the slave stations (communication function with the master station) are possible, and the second condition is that When a line failure occurs, the transition time from Fig. 3 to Fig. 4 (interruption time between parent and child communication functions)
The third condition is that when the line failure is recovered,
→ Shortening the transition time (interruption time between parent and child communication functions) in FIG. 1, the fourth condition is to know the recovery of the line failure quickly, (provisional operation has a large number of slave stations as shown on the right side of FIG. 4). The fifth condition is to simplify the slave station as much as possible (the slave station is unmanned and the repair time is large when a fault occurs because the slave station is unmanned).

The details of the second condition “FIG. 3 → FIG. 4” are as follows from both figures. First, it is detected that the fault is not an instantaneous fault but a continuity fault. (Instantaneous failure recovers spontaneously) Next, the failure site is detected. Next, remove the faulty part from the loop line. (Move the right and left slave stations adjacent to the faulty part to the terminal station.) Finally, move the slave station isolated from the master station to the new master station. (Migrating a conventional terminal station to a relay station) The focus is on detecting a failure site.

In order to make the time for searching for the fault and detecting the faulty part as short as possible, the slave station search method of the fifth invention is good, and also in terms of the line fault recovery detection time, the slave station search method is good. Further, in terms of simplification of the slave station, the master station search method according to the first to third inventions is preferable.

3A to 3D, the faulty part cannot be determined. Therefore, the transition time from the occurrence of the fault in FIGS. 3A to 3D to the temporary operation in FIGS. In order to expedite the description, in the embodiment of the present invention, several faulty part detection methods will be described below. This faulty part detection method includes relay ← → terminal transition time, number of searches, simplicity of search,
In consideration of the simplicity of the slave station, the consistency with the SDLC scheme, the communication suspension time, etc., it is determined whether the search method is the master station search method or the slave station search method.

Hereinafter, a master station search method will be described as a first embodiment of the present invention. FIG. 5 is a circuit diagram showing a master station search method. FIGS. 5A to 5D show case 1 in FIG.
When the slave station S3 does not respond to the normal communication from the master station ML, the slave station S1, the slave station S1 determines whether an instantaneous failure or a continuous failure has occurred.
A fixed number of trial contacts are made toward S2. For this communication, a search signal (address is the slave station S1 and a search signal is data) is transmitted from the master station ML to the slave station S1.

According to the search signal, a response is transmitted from the slave station S1 (the search signal responds to both systems), and the master station ML and the slave station S1 respond.
The interval is determined to be normal. Hereinafter, in the case of the sequential search method, the slave station S2 becomes normal, the slave station S3 becomes abnormal, and it is determined that the faulty part is between the slave station S2 and the slave station S3. Also, in the case of the intermediate search method, the slave station S3 becomes abnormal, the slave station S2 becomes normal, and it is determined that the faulty part is also between the slave station S2 and the slave station S3. The number of searches is the same in both search methods. Note that cases 2 to 4 in FIGS.

Next, the operation of the master station search system in the circuit configuration diagram of FIG. 5 will be described with reference to the time chart of the SDLC system shown in FIG. In the time charts of FIGS. 6 to 14, reference numerals 1 and 2 denote the first system line and the second system line, the parent left is the first parent station, the parent right is the second parent station, and the children 1 to 5 are the children Station, and the number of slave stations is 5.

FIG. 6 is a time chart in the normal operation. In the normal operation, when the information request A1 is transmitted from the master station to the child station, the child 1 and the child 2 are transmitted. , Child 3 the information request A1 is transmitted. When receiving the request, the child 3 transmits an acknowledgment C2, which is a no-response indicating no change, to the master station. At this time, if the child 2 does not have a response, the child 2 is transferred to the child 1 with an acknowledgment C2.
The child 1 similarly sends an acknowledgment to the master station. If there is no abnormality in the line, a response is obtained.

FIG. 7 is a time chart when the child 1, child 3, and child 5 change state. When the information request A1 is transmitted from the parent left, the request is transmitted to the child 3 in the same manner as described above. Is done. Since the child 1 and the child 3 have a state change, the child 1 and the child 3 transmit the presence response C1 indicating the state change to the parent left. Then, the parent left transmits with the acknowledgment A10 of the child 3 and the child 1, and confirms it. Therefore, if there is nothing, the information request A1 is transmitted again, and the response without the child 1 to the child 3 is confirmed. As described above, in the SDLC system, the state change notification of all the slave stations and the confirmation response time of the master station transmission can be completed only once.

FIG. 8 is a time chart at the time of control signal transmission when controlling the child 1 and child 3 devices. When the control signal A2 of the child 1 and child 3 is transmitted from the parent left, the child 3 and child 1 A confirmation response C3 is attached and transmitted to the parent left. Next, the information request A1 is repeatedly transmitted from the parent left, and it is confirmed that the child 3 and the child 1 are operating. Thereafter, an acknowledgment A10 is transmitted to the child 3 and the child 1. In this control, the control time for transmitting the master station is one cycle.

FIG. 9 is a time chart at the time of an instantaneous line failure, which corresponds to the case 2 in FIG. 3B. First, when the information request A1 is transmitted, the instantaneous failure (child 1 When an instantaneous failure occurs in the system 2 line with the slave 2), the information request A1 is transmitted again. If the information request and response at this time are normal, it is assumed that the failure has been recovered and the operation returns to normal. Next, in case 1 of FIG.
A failure occurs in the information request frame due to the failure of the system line of the parent left and child 1, and the response of all child stations is lost. In such a case,
One round communication confirmation B1 is transmitted from the parent left to all the slave stations, and if the confirmation is obtained, it is determined to be normal, and thereafter, the operation shifts to the normal operation.

FIGS. 10 to 12 are time charts in the case of a line continuation failure. In this time chart, the division unit (the part of the terminal relay station in the slave station monitored by the parent station) moves from the detection of the failure part. , Up to normal operation, FIG.
In (1), when a continuation failure occurs in the secondary system line of child 1 and child 2, the information request A1 is transmitted again as in the case of FIG. This state is the same as the first half state of case 2 in FIG. 9, and the tour communication confirmation B1 is transmitted from the parent left about twice (the part surrounded by a rectangle in the figure) to all the child stations. If this communication confirmation B1 is detected twice as being unable to go round, it is detected that a continuous failure has occurred in (2) of FIG. Although omitted in FIG. 9 for the sake of explanation, in the case of “tour confirmation”, unlike the “information request”, information that does not allow a response from the slave station is added. SDL
In the C system, a slave station normally adds information after received information. Then, the master station occupies the additional information line of all slave stations in order to transmit the next “tour confirmation”.
I have to do that time again. If no response from the slave station is made not necessary, it is not necessary to wait for the additional information of all slave stations, the instantaneous fault and the continuous fault can be distinguished quickly, and the continuous fault can be detected earlier by that amount. When this occurrence is detected, the processing of (1) in FIG. 11 is performed. First, when the contact confirmation B2 is transmitted to the child 1, an acknowledgment C3 is transmitted from the child 1 to the parent left, and the contact of the child 1 is established. This oncoming contact confirmation B
2 and its response C3 are not SDLC. The difference is the following two points.

The first point is that only the child station (child 1 in this case) responds. (In the case of the SDLC system, all the received slave stations) In this case, the response of the other slave stations also prolongs the line occupation time and delays the following operation, as in the case of "circular communication confirmation". The second point is that the response direction does not correspond to the flow of the received signal from the master station. In the SDLC system, this is not established unless the master station transmission signal circulates and returns to the master station. This is because the SDLC method is not established because the traveling function is lost while the failure continues. Therefore, the above-mentioned 2
Add information to make points.

Next, the on-line contact confirmation B2 of the child 2 is transmitted in the same manner as described above, but since the confirmation response C3 from the child 2 is not transmitted to the parent left, the on-line communication of the child 2 is not established. Thereby, it is detected that there is a failure between the child 1 and the child 2.

If it is detected, a terminal transfer command for the child 1 is issued in order to move the division (left side of the parent) in (2) of FIG. This terminal transfer command is the same as the on-coming communication confirmation. Then, when the acknowledgment C3 is transmitted from the child 1 to the parent left, a "mode report request" for causing the status of the child station to be reported from the parent left is transmitted. The received slave station informs the master station only of the status of the slave station (relay station or terminal station, presence / absence of a line failure) as "mode report response D1" without a state change notification. As a result, the parent left side can know the child station to which it belongs, and then becomes “normal operation” in which the information request A1 is transmitted, and the parent left contacts the parent right. Thereafter, the child 2 is monitored from the right side of the parent.

The process on the right side of the parent of the movement of the divided portion in FIG. On the right side of the parent, when the relay shift command B3 is first transmitted to the child 3, an acknowledgment C3 is returned from the child 3. Next child 2
Sends the terminal transfer command B3 to the child 2, the acknowledgment C
3 is returned. Thereafter, when the mode report request B4 is transmitted from the right side of the parent, a mode report response D1 is transmitted from each slave station. Thereafter, the parent right side operates normally. S
In order to detect a faulty part in the DLC system, it is necessary to cause a plurality of intermediate stations to perform a mode transition of “terminal ← → relay” and to sequentially verify whether or not a cyclic route has been established.
When the processing is performed as shown in FIGS. 10 to 12, the mode transition of a plurality of intermediate stations becomes unnecessary as shown in FIG. 11A, and the time is shortened accordingly.

FIG. 13 is a time chart of line continuation failure recovery. This time chart shows a process from the provisional operation to the detection of continuation failure recovery and normalization of the division unit. Sends an information request A1 to the child 1, the child 1 sends a no response C2. Then, when the proxy transmission request B5 is transmitted from the parent left side to the child 1,
An acknowledgment C3 is transmitted from child 1 to the parent left side. On the other hand, from the secondary line of child 1, the parent left
As in the case of (1), the opposite contact confirmation proxy is transmitted to the child 2, but the response from the child 2 to the child 1 has not arrived, and it is determined that the failure has not been recovered.

In (2) of FIG. 13, the continuous failure recovery is detected by first transmitting the substitute transmission request B5 of the child 1 from the left of the parent, transmitting the acknowledgment C3 from the child 1 and the subordinate confirming the substitute. 1 is transmitted to the child 2 from the second system line. If the continuation failure has been recovered, this response is received from child 2 to child 1. Thus, the child 1 detects the failure recovery (reference numeral Z in the figure).
Point). Then, the state of the child 1 changes from the presence of the system 2 line failure to the absence thereof. Next, an information request A1 is transmitted from the parent left to the child 1, and the parent left detects that the failure has been recovered due to the presence response C1 from the child 1. So child 1
Then, an acknowledgment A10 is transmitted from the parent left side and returned, so that the process proceeds to the division unit normalization process (FIG. 14). For this, the parent left contacts the parent right. Thereafter, in FIG. 14, a relay transfer command B3 is transmitted from the parent left to the child 1, and a terminal transfer command B3 is transmitted from the parent right to the child 3. Child 1
Transmits an acknowledgment C3 to the parent left, and child 3 transmits an acknowledgment to the parent right. Then, a mode report request B4 is transmitted from the parents left and the parents right, and the parents D and L receive the response D1 from each child station. When the parent right side operates normally thereafter, the parent right side contacts the parent left side. Thereafter, when the relay shift command B3 is transmitted from the parent left to the child 2, the acknowledgment C
3 is sent. During this time, the child 2 becomes a relay from the terminal. If the acknowledgment response C3 is received on the parent left, a mode report request B4 is transmitted, and the mode report response D1 is transmitted from each slave station, so that the parent left also shifts to the normal operation.

The master station search method is processed as shown in the time chart, and a processing flowchart at that time is shown below. FIG. 15 is a macro flowchart of the master station search method. In step S1, it is determined whether a countermeasure is necessary. If (Y), a countermeasure process is performed as shown in FIG. It is determined whether slave station communication is necessary. If (Y) in step S2, FIG.
, And if (N), an information requesting process is performed as shown in FIG.

FIG. 16 is a flowchart of the fault remedy process. In step S11, it is determined whether a continuous fault is being detected, and if (N), it is determined in step S12 whether an instantaneous fault is being detected. If (Y) in step S12, the failure recovery processing (S13) shown in FIG. 19 is performed in detail, and it is determined whether the recovery processing is successful (S14). If (Y), instantaneous failure detection (S15) is set to "0". And Step S1
If (N) in 4, the continuous failure detection (S16) is set to “1”. Note that if (Y) in step S11, the continuous failure countermeasure process (S17) shown in FIG. 20 is performed to set “0” during continuous failure detection and “1” during temporary operation.

FIG. 17 is a flowchart of a slave station communication process. In step S21, it is determined whether there is a transmission request from the transmission HOST serving as a monitoring station. If this determination is (Y), the previous slave station communication in step S22 is transmitted. A judgment process is performed. In this process, if (N), a slave station communication request process (simultaneous multiple slave stations) is performed (S23), then it is determined whether or not a frame has been received (S24). If (Y), the slave station acknowledgment is received. Is determined. If the result of this processing is (Y), the transmission HOST is notified that the transmission has been completed (S26).
After this notification, in step S27, the previous slave station communication is set to "1" and the number of retransmissions is set to "0". Step S25
If (N), it is determined whether the retransmission count limit has been exceeded (S
28A), if (Y), the process of step S27 is performed on the transmission HOST assuming that the slave station communication is congested (28B), and if (N), the number of retransmissions is set to "+1", and step S2 is performed.
The processing is performed again from 3. If (N) in step S24, the process is terminated by setting "1" as the instantaneous failure detection process (S30). When (N) in the determination process of step S21 and (Y) in the determination process of step S22,
The processing of FIG. 18 is performed.

FIG. 18 is a flow chart of the information request processing. In step S31, an information request is transmitted, and it is determined whether or not a frame has been received in the transmission (S32). Is determined (S33),
If (Y), it is determined whether or not there is a status change notification (S3
4) Yes. If (Y) in the determination processing of step S34, an acknowledgment is transmitted to the corresponding slave station (S35). Step S
In the transmission of No. 35, it is determined in step S36 whether or not it is the last slave station. If this processing is (Y), the previous slave station communication is set to "0".
(S37). In step S34, if (N), the line status of the relevant slave station is notified to update the line status (S38), and the determination process of step S36 is performed. Step S3
If it is (N) in 2, the processing during the instantaneous failure detection (S39) is performed.

FIG. 19 is a flow chart of the failure recovery processing.
It is determined whether a frame has been received (S42). If the result of the determination is (Y), a determination is made in step S43 as to whether or not the frame contents match. If the determination is (Y), a process during instantaneous failure detection (S44) is performed (failure recovery successful), and the process ends. If (N) in step S42, it is determined whether the retransmission count limit has been exceeded (S45). If (Y), the continuous failure detection is set to "1" (S47), and the process ends, and (N) in step S45. If the judgment is made, the retransmission count process is set to "+1" and the process is restarted from step S41.

FIG. 20 is a flowchart of the continuous failure countermeasure processing. Step S51 is a failure part detection processing for performing the processing shown in FIGS. 21 to 23 in detail. I do. The details of the dividing part moving process are performed as shown in FIG. As a result of this processing, in step S53, the continuous failure detection is set to "0", and the provisional operation is set to "1".

FIG. 21 shows an intermediate search method in the flowchart of the faulty part detection processing. First, in step S54, it is determined whether or not communication between the master station and the adjacent slave station has been established. A determination process (S55) is performed to determine whether the communication of the meson station has been established. If (N) in this process, then the master station and 1
A determination process (S56) is performed to determine that the communication of the / 4 meson station has been established. Also, if (Y) in the processing of step S55, the master station and 3
It is determined whether the communication of the / 4 meson station has been established (S57). Thereafter, similarly, segmentation is performed in the same manner, and a failure site is detected.

FIG. 22 shows a sequential search method in the flowchart of the faulty part detection processing. In step S58, it is determined whether or not communication between the master station and the adjacent slave station has been established. It is determined as a failure, and if (Y), it is determined whether communication between the master station and the second slave station has been established (S59). As a result of this determination, if (N), it is determined that a failure has occurred between the slave stations 1 and 2, and if (Y), it is determined whether communication between the master station and the third slave station has been established (S60).
Then, in the case of (N), a failure site is sequentially detected in the same manner so that a failure occurs between the slave stations 2 and 3.

FIG. 23 is a flow chart showing the details of the processing for judging the establishment of communication between the master station and the slave stations (FIGS. 21 and 22). Step S61 is a processing for issuing an on-line communication confirmation instruction to the slave station. It is determined whether there is a response from the slave station (S6).
2) Then, if (Y), communication is established, and if (N), communication is not established.

FIG. 24 is a flow chart of the dividing unit moving process. In step S71, after performing a terminal transfer instruction process from the parent left to the left side child station adjacent to the failed unit, the parent left line normalization is confirmed by a mode report request ( S72) is performed. When the confirmation is obtained, the parent left contacts the parent right (S73). Next, the relay right command processing is performed from the parent right to the terminal slave station (S74). Also, a terminal transfer instruction process is performed from the parent right to the right child station adjacent to the failed part (S7).
5). After this processing, the normalization of the parent right line is confirmed by a mode report request (S76). Then, the continuous failure detection process and the provisional operation process are performed (S77), and the process ends.

Next, a description will be given of a slave station search system (test (failure search) signal injection system) according to a second embodiment of the present invention. FIGS. 25A to 25C show the case 1 in FIG. 3A. In FIG. 25A, when a failure occurs, the normal communication from the master station ML is interrupted. In FIG. 25 (B), the normal communication is repeated from the master station ML to determine whether it is an instantaneous failure or a continuous failure in FIG. 25 (B). ) Inject the signal repeatedly. The method of injecting the failure search signal is not the SDLC method (the SDLC method adds an additional transmission signal to the end of the received signal). In FIG. 25 (C), the normal communication is further repeated from the master station ML. On the other hand, the stations other than the slave station S3 receive the fault search signal from the above and stop the fault search signal injection when the fault search signal injection condition disappears. The primary system injection failure search signal of the slave station S3 is
Incoming call. In this state, the failure search signal of only one system of the slave station S3 is received a predetermined number of times, and the occurrence of the continuous failure and the continuous failure part are detected.

FIGS. 25D to 25F show cases 2 to 4 shown in FIGS. 3B to 3D.
(C) is the result of the processing performed in the same manner as in Case 1, and the state at the time of detection of the failed part will be described below. FIG. 25D shows case 2.
In the case of (single failure of the upstream 2 system line), in this case, the failure unit is detected from the incoming test signal of the 2 system of the slave station S2.

FIG. 25 (E) shows the case of Case 3 (failure in the same section in the upper and lower parts). In this case as well, the failure part is detected from the arrival of the test signal of the secondary system of the slave station S2.

FIG. 25F shows Case 4 (upper / lower section failure). In this case, a failure section is detected from the incoming test signal of the secondary system of the slave station S3. It should be noted that the test signal of the secondary system of the slave station S3 includes a reception error of the primary system of the slave station S2 (1
System test signal). FIG. 25 (C), (D),
In the case of (E), the continuous failure site can be detected by the "test signal transmission slave station number" and its one or two systems. However, FIG.
In the case of 5 (F), the method uses “slave station S3 ← → slave station S
4d. From FIG. 4d, the continuous failure site must be determined to be "between slave station S1 and slave station S4." Slave station S3 is system 1 and system 1 of slave station S2 is transmitted. Of the slave station S1
In this case, the parent-left ML may transfer the slave station S1 to the terminal.

Next, the operation of the slave station search system in the circuit configuration diagram of FIG. 25 will be described with reference to the time chart of the SDLC system shown in FIG. In the time chart of FIG. 26, reference numerals 1 and 2 denote the first system line and the second system line, the parent left represents the first parent station, the parent right represents the second parent station, and the children 1 to 5 represent the child stations. The number of slave stations was set to five.

FIG. 26 shows the slave station search method based on the time chart of the instantaneous line failure. Since the operations during normal times, state changes, and control are the same as those in the master station search method described with reference to FIG. The chart and the description are omitted, and a description will be given from the time chart of the instantaneous failure. In FIG. 26, the operation in case 1 is the same as that of the parent station search method, so that the description is omitted here, and the child station search method in case 2 will be described. In case 2, information request A
When 1 is transmitted to all slave stations, there is no response from all slave stations because there is a failure in the information request frame on the system 1 line between parent left and child 1. At this time, if the processing of the portion surrounded by the rectangle in the figure is performed and the next information request is normal, it is assumed that the instantaneous failure has been recovered and the operation returns to normal.

FIG. 27 to FIG. 29 are time charts in the case of a continuous fault. These time charts are from the detection of a faulty part to the movement of the dividing unit to the normal operation.
In (1) of 7, when the information request A1 is transmitted, when a continuation failure occurs in the 1-system line of the child 1 and the child 2, the response is normal. The next information request A1 is interrupted due to the failure of the 1-system line from child 1 to child 2 as shown in FIG. Thereafter, the information request A1 is repeatedly transmitted from the parent left. Then 1 of child 2
The system, the first system of the child 3, the second system of the child 2, the two systems of the child 1, and the parent left are in a state where there is no received signal. The slave station transmits a failure search signal to the line of the relevant system on the condition that “the absence of the received signal has continued for a predetermined time or more”. In the figure, child 2 is on the system 1 line, child 3 is 1
The child 2 starts transmitting a failure search signal to the secondary line, and the child 1 starts transmitting a failure search signal to the secondary line. The transmission of the fault search signal is stopped for the lines other than the 1-system line of the child 2 by receiving the search signal from the upstream. Then, a failure search signal is transmitted only in the immediate downstream part of the failure part. If the information of "child 2 system 1 transmission" is included in the failure search signal, the parent left receives only this signal a certain number of times or more (only once, the child 1
A continuous fault is detected including the fault part (which is a system transmission signal).

In (1) of FIG. 28, a failure search signal is transmitted to the 1-system line of child 2 from (2) of FIG. 27, and a failure between child 1 and child 2 is detected. Next, a child 1 terminal transfer command is issued from the left side of the parent for the dividing unit movement processing of (2) in FIG.
See the confirmation response C3. When the child 1 transitions to the terminal station, the failure search signal is looped back as shown in the figure. Thereafter, a mode report request B4 is transmitted, and the response D1 is confirmed. After confirmation,
The parent left side operates normally, and the parent left side contacts the parent right side. Thereafter, the operation of the parent right-side divided section movement is as shown in FIG.

FIG. 29 is a time chart on the right side of the parent of the moving part. In FIG. 29, a failure search signal from the system 1 line of the child 2 is transmitted to the child 3, and a child 3 relay shift command B3 is transmitted from the right of the parent. Is done. With this command, the confirmation response C3 of the child 3 is returned to the right side of the parent. On the other hand, a failure search signal is transmitted to the parent right from the 1-system line of the child 2 due to the relay shift of the child 3. Further, the terminal shift command B3 of the child 2 is transmitted from the parent right, and the confirmation response C3 of the child 2 is transmitted to the parent right.
By the transfer of the terminal of the child 2, the system 1 line failure search signal of the child 1 is transmitted to the child 1. When the above-mentioned terminal transfer is completed, a mode report request B4 is transmitted from the parent right, and a mode report response D1 is received from each slave station. Thereafter, the parent right also operates normally.

FIG. 30 and FIG. 31 are time charts for continuous fault recovery, in which continuous fault recovery is detected from provisional operation.
FIG. 30 (1) is a time chart of provisional operation up to normalization of the division unit. The information request A1 is transmitted from the parent left, and the absence response C2 from the child 1 is received. On the other hand, the information request A1 is also transmitted from the parent right, and the response is received.
Note that a failure search signal for the child 2 and system 1 lines is output between the child 1 and the child 2. This search signal is received by the two systems of the child 1,
Since the terminal is in the terminal station state, the received signal is relayed to the first system line of the loopback 2. However, it does not return to child 2 while the failure of the child 1 → child 2 line continues.

If the continuation fault is recovered while this signal is being output, the child 2 detects the continuation fault recovery by one round of the fault search signal for the child 2 and the 1-system line. ((2) Continuous failure recovery in FIG. 30) This failure recovery is transmitted to the parent right and the child 2 in response to the information request A1.

In the time chart of FIG. 31, the parent right informs the parent left of this fact and performs normalization of the division part. The parent left transmits the relay shift command B3 of the child 1, and the parent right transmits the child 3 terminal. The shift command B3 is transmitted. The parent left receives the acknowledgment C3 of the child 1, and the parent right receives the acknowledgment C3 of the child 3. During this time, child 1 becomes a relay from the terminal, and child 3 becomes a terminal from the relay. The child 2 sends the mode report request B4 from the parent left and the parent right while the terminal remains as it is, and when the response D1 is received, thereafter the parent right operates normally and the parent right contacts the parent left. You. On the other hand, on the parent left, the relay transfer command B3 of the child 2 is transmitted, and there is an acknowledgment C3 of the child 2. During this time, the child 2 becomes a relay from the terminal, a mode report request B4 is transmitted from the parent left, and a response D1 is obtained from each child station, so that the parent left also operates normally.

The slave station search method is processed as shown in the above time chart. A processing flowchart at that time is shown below. Since the processing flowcharts of FIGS. 15 to 18 and FIG. 24 are the same among the flowcharts shown in the master station search method, only the failure recovery processing flowchart and the continuous failure countermeasure processing flowchart will be described. FIG. 32 is a flowchart of the failure recovery process. In step S81, the previous transmission content is retransmitted, and it is determined whether a frame has been received (S82). If the result of the determination is (Y), it is determined that the frame contents match (S83). If (Y), the instantaneous failure detection is set to "0" (S84). ). If (N) in step S82, it is determined whether the retransmission count limit has been exceeded (S8).
5) Then, if (Y), the continuous failure detection is set to "1" (S8).
7) is performed, and the process is terminated. If the determination in step S85 is (N), the retransmission count process is set to “+1”, and step S81 is performed.
Starts the process again. If (N) in step S83, it is determined whether there is a failure detection signal from the slave station (S88).
Then, if (N), the process proceeds to step S81, if (Y), it is determined whether the content is the specified number of times (S89), if (N), the process proceeds to step S81, and if (Y), the process proceeds to step S87. In the figure, reference numeral * 1 indicates that a failure occurs between the master station and the nearest upstream child station, and reference numeral * 2 indicates the occurrence of a continuous failure and the failure site from the content of the failure detection signal from the child station. In this way, in the slave station search method, unlike the master station search method, a faulty part is identified at the portions indicated by the codes * 1 and 2.

FIG. 33 is a flowchart of a continuation failure countermeasure process. Step S91 is a dividing portion moving process. The details of the dividing portion moving process are the same as those shown in FIG. 24 described above. As a result of this processing, it is set to “0” during continuous failure detection and “1” during provisional operation in step S92.

FIG. 34 is a flowchart of the master station search method in the slave station. In step S101, it is determined whether the received frame is addressed to the own station. If (Y), it is determined whether the received frame is for failure search ( S102), and if (N), it is determined whether the terminal / relay or terminal-time main system is designated (S103). If the result of this determination is (N), it is determined whether the request is a terminal era transmission request (S104). If (N), it is determined whether an information request has been received (S105). After determining (S106), if (N), it is determined whether a confirmation message has been received (S107), and the other processing (S107)
108), and returns to step S101. If each of the determination units in steps S102 to S107 determines (Y), the processes in steps S109 to S114 are performed, and the process returns to step S101. Steps S101 to S104 and step S10
9 to S111 are processing of both the main system and the slave system, and the others are processes of the master station contact person in charge, which is the main system.

FIG. 35 is a flowchart of the slave station search method in the slave station. In step S121, it is determined whether a frame has been received. If (Y), in step S122, it is determined whether the frame is addressed to its own station. If the determination result of step S122 is (Y), it is determined in step S123 whether the frame is for failure detection. If the result of this determination is (N), it is determined whether the terminal / relay or terminal-time main system is designated (S124).
The same processing as Steps S105 to S108 of Step 4 is performed. In step S129, it is determined whether a predetermined time has elapsed when it is determined as (N) in step S121. If (N), the process returns to step S121. If (Y), the process returns to step S13.
The fault search transmission of No. 2 is performed, and the process returns to step S121. If the determination in step S122 is (N), the determination in step S130 is performed. If the determination is (N), step S121 is performed.
Returning to (Y), the process of step S132 is performed. If (Y) is determined in step S123, the failure information update process (S131) is performed, and (Y) is determined in step S124.
If so, the terminal / relay designation reception or terminal-time master designation reception process (S133) is performed, and the process returns to step S121.
The processing in steps S125 to S127 is performed in the same manner as in FIG.

[0066]

As described above, according to the present invention,
In the remote monitoring control using the SDLC method, it is possible to simplify the handling at the time of a line failure, to shorten the detection time of a failed part, and to shorten the communication interruption time at the time of a line failure.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram in a normal state.

FIG. 2 is an explanatory diagram of a failure pattern to be examined.

FIG. 3 is an explanatory diagram showing a state when a line failure occurs.

FIG. 4 is an explanatory diagram showing a state during provisional operation.

FIG. 5 is a circuit diagram showing a first embodiment of the present invention.

FIG. 6 is an SDL for explaining the normal operation of the master station search method.
Time chart of the C system.

FIG. 7 is an SDL for explaining an operation at the time of state change in the master station search method.
Time chart of the C system.

FIG. 8 is an SDL for explaining the operation at the time of controlling the master station search method.
Time chart of the C system.

FIG. 9 is an SD illustrating an operation of an instantaneous failure in the master station search method.
LC time chart.

FIG. 10 is a time chart of the SDLC method for explaining the operation of detecting the occurrence of a continuous failure in the master station search method.

FIG. 11 is a time chart of the SDLC system for explaining the operation of detecting a fault in the master station search system.

FIG. 12 is a time chart of the SDLC method for explaining the operation of moving the division unit in the master station search method.

FIG. 13 is a time chart of the SDLC system for explaining an operation of continuous failure recovery in the master station search system.

FIG. 14 is a time chart of the SDLC method for explaining the operation of normalizing the division unit in the master station search method.

FIG. 15 is a macro flowchart of a master station search method.

FIG. 16 is a flowchart of a failure countermeasure process of the master station search method.

FIG. 17 is a slave station contact processing flowchart of the master station search method.

FIG. 18 is an information request processing flowchart of a master station search method.

FIG. 19 is a failure recovery processing flowchart of a master station search method.

FIG. 20 is a continuation failure countermeasure processing flowchart of the master station search method.

FIG. 21 is a flowchart of a faulty part detection process of the intermediate search method in the master station search method.

FIG. 22 is a flowchart of a failure detection process in the sequential search method in the master station search method.

FIG. 23 is a flowchart of a process for determining the establishment of communication between a master station and slave stations in a master station search method.

FIG. 24 is a flowchart of a division unit moving process of the master station search method.

FIG. 25 is a circuit diagram showing a second embodiment of the present invention.

FIG. 26 is a flow chart illustrating the operation of an instantaneous failure operation in the slave station search method.
4 is a time chart of the DLC method.

FIG. 27 is a diagram illustrating an operation of a continuous failure operation in the slave station search method.
4 is a time chart of the DLC method.

FIG. 28 is an SD for explaining the operation of the left side of the parent station in the slave station search method.
LC time chart.

FIG. 29 is an SD for explaining the operation of the right side of the parent in the slave station search method.
LC time chart.

FIG. 30 is a time chart of the SDLC method for explaining the operation of continuous fault recovery in the slave station search method.

FIG. 31 is a time chart of the SDLC method for explaining the operation of normalizing the division unit in the slave station search method.

FIG. 32 is a flowchart of a failure recovery process of the slave station search method.

FIG. 33 is a flowchart of a continuation failure countermeasure processing in the slave station search method.

FIG. 34 is a flowchart of a master station search method in a slave station.

FIG. 35 is a flowchart of a slave station search method in a slave station.

FIG. 36 is a schematic configuration diagram of a three-group configuration in a polling method.

FIG. 37 is a schematic configuration diagram of a three-group configuration in the token ring system.

FIG. 38 is a schematic configuration diagram of a line failure response in a polling method.

FIG. 39 is a schematic configuration diagram of a line failure response in the token ring system.

FIG. 40 is a schematic configuration diagram of handling a line failure in the polling method.

FIG. 41 is a schematic configuration diagram of a line failure response in the token ring system.

[Explanation of symbols]

 ML: Master station left MR: Master station right S1, S2, S3: Child station

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Koichi Kawabe 2-1-17 Osaki, Shinagawa-ku, Tokyo Inside Meidensha Co., Ltd.

Claims (5)

[Claims] A remote station for maintaining a communication function by changing the assignment of a slave station to each loop line due to a loop line failure, wherein a plurality of master stations and a number of slave stations are connected by a loop line for each master station. In the supervisory control system, when a master station sends an information request to a slave station, if there is no response from the slave station that received the information request, the master station sends a cyclic contact confirmation signal, and this confirmation signal is not patrolable. A remote monitoring control method characterized in that it is recognized that a continuous fault has occurred in the line if detected. 2. When it is recognized that the continuous fault has occurred, if communication between the master station and the adjacent slave station is not established, it is detected that there is a faulty part between the master station and the adjacent slave station, and the communication is determined. If it is established, see that the communication between the master station and 1/2 meson station is established,
If established, then determine the communication between the master station and the 3/4 meson station,
2. The remote monitoring control system according to claim 1, wherein if the determination is not successful, the determination of communication between the master station and the 1/4 intermediate station is sequentially subdivided to detect a faulty part. 3. When it is recognized that the continuous fault has occurred, if communication between the master station and the adjacent slave station is not established, it is detected that a faulty part exists between the master station and the adjacent slave station. Bureau and 2
It checks whether the communication between the slave stations is established or not. If the communication is not established, it detects that there is a faulty part between the first and second slave stations. 2. The remote monitoring control system according to claim 1, wherein it is determined whether the communication is established or not. 4. When recognizing that the continuous failure has occurred, a terminal transfer command is transmitted from the first master station that has detected the continuous failure to the adjacent child station on the side of the failure site first master station, and After confirming that the line of the station has been normalized, the second master station
The second master station sends a relay shift command to the terminal slave station, and the second master station sends a terminal shift command to the faulty site second master station side adjacent slave station to notify the second slave station. 4. The remote monitoring control system according to claim 1, wherein the line is normalized. 5. A remote station for maintaining a communication function by connecting a plurality of master stations and a number of slave stations by loop lines for each master station, and changing the assignment of slave stations to each loop line due to a failure of the loop line. In the supervisory control method, a slave station that does not receive a signal for a certain period of time transmits a fault search signal for the line, and a slave station that receives a fault search signal from upstream stops transmitting the fault search signal, and performs the fault search. A remote monitoring control method characterized by recognizing that a continuous fault has occurred in a line when the number of times a signal arrives at a master station reaches a predetermined number.