JPH0352353A - Fault monitor system - Google Patents

Abstract

PURPOSE:To detect a faulty communication node immediately by allowing a count means for only a communication node detecting a fault of a data at first to count the lapse of predetermined time, displaying the fault by a fault display means and allowing other communication node count means to stop the count immediately. CONSTITUTION:A specific code transmission means 300 sends a predetermined specific code to a transmission line 2 when a fault detection means 200 detects a fault in reception information. A specific code detection means 500 monitors whether or not received information is a specific code and stops the count of a count means 400 when the received information is detected to be a specific code. Thus, the count means 400 for only the communication node detecting a fault of data at first counts the lapse of predetermined time and a fault display means 600 displays the detection of the fault, and the count means 400 of other communication nodes 1 stops immediately the count by the control from a specific code detection means 500 and a fault display means 600 displays no fault. Thus, a faulty communication node is immediately detected.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a fault monitoring method in a ring network system in which a plurality of communication nodes are connected in a ring through a transmission path, and each communication node transmits and receives data in one direction via the transmission path. In the event of a failure in the network system,
In order to detect affected communication nodes as quickly as possible, each communication node has an abnormality detection means that monitors whether there is an abnormality in the received information arriving from the transmission path, and an abnormality detection means that monitors the presence or absence of an abnormality in the received information arriving from the transmission path. a specific code sending stage for sending a predetermined specific code to a transmission path; a timing unit that starts timing when the abnormality detecting means detects an abnormality in the received information; A specific code detection means that monitors whether or not the received information is a specific code and stops the time measurement when the received information is detected as a specific code; determined power,
and a failure display means for displaying the detection of a failure when the elapsed time is measured.

[Industrial Field of Application] The present invention relates to a ringtone system in which a plurality of communication nodes are connected in a ring through a transmission path, and each communication node transmits and receives data in one direction via the transmission path. 7 Concerning fault monitoring methods in network systems.

[Prior Art] FIG. 4 is a diagram showing an example of a ringnet work system to which the present invention is applied, FIG. 5 is a diagram showing an example of a conventional communication node, and FIG. 6 is a diagram showing an example of a conventional communication node. FIG. 2 is a diagram showing an example of a transfer information format in FIG.

In FIG. 4, four sets of communication nodes (N) 1 (individual communication nodes (N) are referred to as 1-1 to 1-4, hereinafter the same) are connected in a ring by a transmission path 2. In FIG. 4, it is assumed that the transmission path 2 has a transmission direction in one direction (eg, clockwise).

In FIGS. 4 to 6, all communication nodes (N) 1
When no data transmission request is generated, tokens TK as shown in FIG. 6 are circulating on the transmission line 2.

The token TK is a global address A indicating that it can be received by all communication nodes (N)1. , token data DTκ in a predetermined code format, and an abnormality detection unit FCS that indicates whether there is an error in the received information.

In each communication node (N) 1 in operation, the bypass selector (BPS) 11 and the transmission data selector (SDS) 18 both select the input terminal A side and connect it to the output terminal C.

Now, suppose that a transmission request to another communication node (N) (for example, 1-3) occurs in the node processing unit (NPR) 17 of a certain communication node (N) (for example, pol-1). The processing unit (NPR) 17 is the ring transmission control unit (RSC) 16?
This transmits the transmission request.

In the communication node (N) 1-1, a ring interface receiving unit (RIR) 12 receives received information arriving from the transmission path 2, and processes the received information arriving from the transmission path 2 by a data abnormality detection unit (DFD) 13, a data delay unit (DDL) 14, and a data analysis unit. (DAN) 15.

A data abnormality detection unit (DFD) 13 monitors the received information for errors.

When the data analysis unit (DAN) 15 analyzes the received information and detects that it includes the global address A and token data DTK, the ring transmission control unit (RSC) 16
Notify that you have acquired the right to send.

The ring transmission control unit (RSC) 16 which has received the transmission request from the node processing unit (NPR) 17 and the transmission right acquisition notification from the data analysis unit (DAN) 15 inputs the transmission data selector (SDS) 18. The terminal B side is selected and switched so that it is connected to the output terminal C, and the received token TK is held.

Thereafter, the node processing unit (NPR) 17 will be the communication node (N).
Address A3 indicating communication node (N) 1-3 and abnormality detection unit FC are added to data D to be transferred to (for example, l-3).
S is added to form a data frame DT as shown in FIG. 6, and the data frame DT as shown in FIG. After sending to 2,
Release the received token TK.

The transmitted information (data frame DT) arrives at the communication node (N) 1-2 via the transmission path 2 as received information.

In the communication node (N) 1-2, a data analysis section (D
AN) 15 analyzes the received information in the same way as described above, and the address A3 of the data frame DT is its own communication node (N) 1-2.
If it is determined that the recipient is not the recipient, the received information is discarded.

The data delay section (DDI) 14 includes a data analysis section (DA
N) 15 gives the received information a delay time of about the time required to analyze the received information, and then sends the transmission data selector (SD
S) Transmit to the human power terminal A side of 18.

As a result, the received information is transmitted data selector (SDS) 1
8. The signal is sent to the transmission path 2 as transmission information via the ring interface transmission section (R[S) 19 and high bus selector (BPS) 11.

The transmitted information (data frame DT) arrives at the communication node (N) 1-3 via the transmission path 2 as received information.

In the communication node (N) 1-3, the data analysis section (D
AN) 15 analyzes the received information in the same way as described above, and the address A of the data frame DT is its own communication node (N) 1-3.
If it is determined that the data frame DT is the destination, the data frame DT is sent to the node processing unit (
j'JPR) 17.

In this state, if a failure occurs in the ring interface transmitter (RIs) 19 of the communication node (N) 1-4 and abnormality information is sent to the transmission path 2, the abnormality information will be sent to the transmission path 2.
The received information arrives at communication node (N) 1-1 via .

In the communication node (N) 1-1, the data anomaly detection unit (DFD) 13 detects an anomaly in the received information, but the data analysis unit (DAN) 15 detects the own communication node (N) from the anomaly information.
) 1-1 address A. or global address A
Since G cannot be detected, the received information is discarded, and the abnormal information is sent to the data delay unit (DDL) 14 and the transmission data selector (
SDS) 18, ring interface transmitter (RIS)
19# and the bypass selector (BPS) 11 to the transmission path 2 as transmission information.

Similarly, in each communication node (N) 1-2 to 14, the data anomaly detection unit (DFD) 13 only detects an anomaly in the received information and sends the anomaly information to the transmission path 2 as transmission information. , all the communication nodes (N) 1 making up the ring network system detect an abnormal state, and the ring network system becomes unable to communicate.

In such a case, in order to identify the affected communication node (N) 1-4, one bypass selector (BPS) 11 of each communication node (N) 1-1 to 1-4 should be connected to the manual terminal B. The receiving information arriving from the transmission line 2 is sent directly to the transmission line 2 as transmission information via the bypass selector (BPS) 11, while the abnormal information circulating on the transmission line 2 is set to select the side. There is no other way than to monitor whether or not it disappears, and determine that the communication node (N) 1 that switched the bypass selector (BPS) 11 when it disappears is the location where the failure has occurred.
Further, when a failure occurs intermittently, it becomes difficult to identify the affected communication node (N)1.

[Problem to be solved by the invention]

As is clear from the above explanation, in a conventional network network system, when a failure occurs in any communication node (N) 1, abnormal information is transmitted to the transmission line 2 depending on the failure.
All the communication nodes (N)1 become in a failure detection state, and finally the ring network system becomes unable to communicate, and it takes a lot of effort to detect the affected communication node (N)1. There is a problem in that it is difficult to identify the affected communication node (N) 1 when it takes time and failures occur intermittently.

An object of the present invention is to detect an affected communication node as quickly as possible when a failure occurs in a ring network system.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 1 is a communication node, and 2 is a transmission line connecting each communication node 1 in a ring.

Each communication node 1 transmits and receives data in one direction via the transmission path 2.

200 is an abnormality detection means provided in the communication node 1 according to the present invention.

300 is a specific code sending means provided in the communication node 1 according to the present invention.

Reference numeral 400 denotes a clock means provided in the communication node 1 according to the present invention.

500 is a specific code detection means provided in the communication node 1 according to the present invention.

600 is a fault display means provided in the communication node 1 according to the present invention.

[Effect]

The abnormality detection means 200 monitors the presence or absence of an abnormality in the received information arriving from the transmission path 2 .

The specific code sending means 300 sends a predetermined specific code to the transmission path 2 when the abnormality detection stage 200 detects an abnormality in the received information.

The clocking means 400 starts clocking when the abnormality detecting means 200 detects an abnormality in the received information.

The specific code detection means 500 monitors whether the received information is a waiting code or not, and when it detects that the received information is a specific code, causes the clocking means 400 to stop clocking.

The failure display means 600 displays the detection of a failure when the timer 400 measures the passage of a predetermined time shorter than the time required for information to make one round on the transmission line 2.

Therefore, the timekeeping means of only the communication node that first detects a data abnormality measures the passage of a predetermined time, and the failure display means indicates that a failure has been detected, but the timekeeping means of other communication nodes detects a specific code. Since the time measurement is immediately stopped under control from the means and the fault display means does not display the fault, the affected communication node can be immediately detected, improving the reliability and convenience of the ring network system.

[Example] An embodiment of the present invention will be described below with reference to Drawing C.

FIG. 2 is a diagram showing a communication node according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of the fault display process in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures. The target ring network system is as shown in FIG. 4, and the transfer information format is as shown in FIG.

In FIG. 2, a data anomaly detection section (D
FD) 13 is provided, and a specific pattern transmission selector (PT) is provided as specific code sending means 300 in FIG.
S) 101 and specific pattern creation department (PTG) 102
A timing section (TIM) 103 is provided as the timing means 400 in FIG. 1, and a specific pattern detection section (TIM) is provided as the specific code detection section 500 in FIG.
PTD) 104 is provided, and a fault display section (FID) 105 is provided as fault display means 600 in FIG.

The specific pattern transmission selector (PTS) 101 is set to normally select the input terminal A side and connect it to the output terminal C.

A specific pattern generator (PTG) 102 generates a predetermined fixed pattern p.

In FIGS. 2 to 4 and 6, a node processing unit (NPR) 1 of a certain communication node (N) (for example, 1-1)
7, when a transmission request to another communication node (N) (for example, 1-3) occurs, the ring interface receiving unit (RIR) in each communication node (N) 1-1 to 1-4
) 12, data delay unit (DDL) 14, data analysis unit (
DAN) 15, ring transmission control unit (RSC) 16, node processing unit (NPR) 17, transmission data selector (SOS)
) 18 and ring interface transmitter (RIS) 1
9 operates in the same manner as described above, and data D is data frame D.
T, the data is transferred to communication node (N) 1-3 via transmission path 2 and communication node (N) 1-2.

In this state, if a failure occurs in the ring interface transmitter (RIS) 19 of the communication node (N) l-4 and the abnormality information X is sent to the transmission path 2, the abnormality information X is transmitted via the transmission path 2. and sends the received information r to the communication node (N) l-1.
Arrives as 1.

In the communication node (N) 1-1, the ring interface reception unit (RrR) 12 transmits the received information r1 to the data abnormality detection unit (DFD) 13, the data delay unit (DDL) 14, and the digital analysis unit (DAN) 15. However, since the data analysis unit (DAN) 15 cannot detect the address A of its own communication node (N) 1-1 from the received information r, (=x), the received information r, is not detected by the data delay unit (DDL). ) 14, transmission data selector (SDS) 18, specific pattern transmission selector (PTS) 1 0 1, ring interface transmission section (RIS) 19# and bypass selector (BPS)
11 to the transmission path 2 as transmission information flU S .

On the other hand, the data abnormality detection unit (DFD) 13 detects received information r,
When an abnormality is detected, the specific pattern transmission selector (P
TS) 1 0 1, select the input terminal B side and connect it to the output terminal C.
rM) 103 starts timing.

Specific pattern transmission selector (PTS) 1 0 1
By being set to switch, the received information r. which is manually input to the input terminal A side. (=x), and transmits the fixed pattern p generated by the specific pattern generator (PTG) 102 via the ring interface transmitter (RIS) 19 and the bypass selector (BPS) 11.
! 2, it is sent as transmission information S.

On the other hand, the specific pattern detection unit (PTD) 104 monitors the presence or absence of the fixed pattern p in the received information r1.
．． No fixed pattern p can be detected from (=x),
The time measurement of the time measurement unit (TIM) 103 is not stopped.

As described above, the specific pattern transmission selector (PTS) 1
Abnormality information X is sent before 01 is switched and set,
After the switching setting, the fixed pattern P is transmitted as the transmission information S. is transferred to communication node (N) 1-2 via transmission path 2 as received information rt.

In the communication node (N) 1-2, the data abnormality detection unit (DFD) 13 detects an abnormality from the reception information r2 transmitted from the ring interface reception unit (RrR) 12, as described above, and detects an abnormality for specific pattern transmission. Selector (PTS)
101 and set the time measurement unit (TMM) 1.
03 to start timing.

As described above, the specific pattern transmission selector (PTS) 1 0 1 selects the ring interface reception unit (R■R) 12 and the data delay unit (DDL) before being switched and set by the data abnormality detection unit (DFD) 13. ) 14 to the input terminal B, the abnormality information
After transferring as 2, data abnormality detection unit (DFD) 13
When the switching setting is made by
G) The fixed pattern p generated by 102 is sent to the transmission path 2 as transmission information s2 via the ring interface transmission section (RIS) 19 and the bypass selector (BPS) 11.

On the other hand, the specific pattern detection unit (PTD) 104 monitors the presence or absence of the fixed pattern p in the reception information r2 transmitted from the ring interface reception unit (RIR) 12, and detects the fixed pattern following the abnormality information X from the reception information r2. When p is detected, time measurement by the time measurement unit (TIM) 103 is stopped.

As a result of the above, after the abnormality information The information is transferred as information r.

In the communication node (N) 1-3, the data anomaly detection unit (DFD) 13 initially detects anomaly information The pattern transmission selector (PTS) 101 is switched and set, and the data delay section (D
DL) 14 and the transmission data selector (SDS) 18 to the manual terminal A of the specific pattern transmission selector (PTS) 101, followed by the fixed pattern p and the transmission line 2 as the transmission information S. At the same time, the timing section (TIM) 103 starts timing, but the specific pattern detection section (PTD) 104 receives the received information r,
When it is detected that the fixed pattern p has arrived following the abnormality information X, the time measurement of the time measurement unit (TIM) 103 is stopped.

As described above, after the abnormal information l1x is first transmitted for a short time, the fixed pattern p is continuously transmitted.
is transferred to communication node (N) 1-4 via transmission path 2 as received information r4.

Also in the communication node (N) 1-4, the data anomaly detection unit (DFD) 13 initially detects anomaly information Detect and set specific pattern transmission selector (PTS) 1 0 1,
Because the ring interface transmitter (RIS) 19 has a failure, the abnormality information ) 104 detects from the received information r4 transmitted from the ring interface receiving unit (RIR) 12 that the fixed pattern P has arrived following the abnormality information X, it causes the time measuring unit (TIM) 103 to stop measuring time.

On the other hand, in the communication node (N) 1-1, the time measurement unit (TIM) 103 that continues to measure time has timed the passage of a predetermined time shorter than the time required for information to go around the transmission path 2. In this case, the fault indicator (FID) 105 is activated.

The activated fault display unit (FMD) 105 displays that a fault has been detected.

In the other communication nodes (N) 1-2 to 1-4, the time measurement unit (TIM) 103 is stopped from measuring time, so the fault display unit (FID) 105 is not activated.

As described above, since the fault display unit (FID) 105 of only the communication node (N) 1-1 displays the detection of a fault, the reception-related parts of the communication node (N) l-1, the communication node (N) 1-
It is determined that a failure has occurred in either the transmission-related portion of No. 4 or the transmission path 2 connecting communication node (N) 1-4 and communication node (N) 1-1.

As a result, when the bypass selector (BPS) 11 in the communication node (N) 1-1 is first switched and set,
Communication node (N) 1-4 sends transmission information s4 to transmission path 2.
The abnormality information X sent to communication node (N) 1-2 will be transferred to communication node (N) 1-2 as reception information
The fault display unit (FID) 105 of N) 1-2 will display the detection of a fault, but next, the communication node (N) 1-4
When the bypass selector (BPS) 11 in the communication node (N) is switched and set, the abnormality information
) 1-1, and the ring network system can be restored normally, and it becomes clear that the affected part is the transmission-related part of communication node (N) 1-4.

As is clear from the above description, according to this embodiment, the communication node (N)l- which first detected an abnormality in the received information r,
Only one node (N
) 1-2 to 1-4 do not display any failure detection,
It becomes possible to immediately detect the affected part (in the example, the transmission-related part of communication node (N) 1-4), and the communication node (N) 1-
Appropriate measures such as operating the high-pass selector (BPS) 11 of No. 4 to disconnect from the transmission line 2 can be quickly executed.

Note that FIGS. 2 to 4 and 6 are merely examples of the present invention, and for example, the structure of the ring network system, the structure of each communication node (N) 1, and the data frame DT and token. The structure of the TK is not limited to that shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case.

[Effects of the Invention] As described above, according to the present invention, in the Linnet work system, the timing means of only the communication node that first detects data abnormality measures the elapse of a predetermined time,
Although the fault display means displays the fault, the time measurement means of the other communication nodes immediately stop timing, and the fault display means does not display the fault detection. Therefore, the affected communication node can be detected immediately, and the ring network system Improved reliability and convenience.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a communication node according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of the fault display process in FIG. 2, and FIG. FIG. 5 is a diagram showing an example of a ring network system to which the present invention is applied, FIG. 5 is a diagram showing an example of a conventional communication node, and FIG. 6 is a diagram showing an example of the transfer information format in FIG. In the figure, ■ is a communication node (N), 2 is a transmission path, l1
is a bypass selector (BPS), 12 is a ring interface receiving unit (RIR), and 13 is a data abnormality detection unit (
14 is a data delay unit (DDL), 15 is a data analysis unit (DAN), and 16 is a ring transmission control unit (RSC).
), 17 is a node processing unit (NPR), 18 is a transmission data selector (SDS), l9 is a ring interface transmission unit (RIS), and 101 is a selector for specific pattern transmission (
PTS), 102 is a specific pattern creation department (PTG), 1
03 is a time measurement unit (TTM), 104 is a specific pattern detection unit (PTD), 105 is a fault display unit (FID), 200 is an abnormality detection means, 300 is a specific code sending unit, 400 is a time measurement unit, and 500 is a specific code detection unit Means, 600 indicates failure display means 1 Principle of non-invention Diagram number 1 Diagram 2 Note 1 The beak is supposed to be raised 0 3 Whistle toe Mouth-prompting rice Aro-dori/Answer, j-F

Claims (1)

[Claims] A plurality of communication nodes (1) are connected in a ring through a transmission path (2), and each of the communication nodes (1) transmits and receives data in one direction via the transmission path (2). In the ring network system, each communication node (1) has an abnormality detection means (2) that monitors whether there is an abnormality in received information arriving from the transmission path (2).
00), and when the abnormality detection means (200) detects an abnormality in the received information, a predetermined specific code is sent to the transmission path (200).
2) a specific code transmitting means (300) for transmitting a specific code to the specified code; a clocking unit (400) that starts timing when the abnormality detecting means (200) detects an abnormality in the received information; specific code detection means (400) that monitors whether the received information is a code and stops the time measurement of the time measurement means (400) when the received information is detected as the specific code;
500), and a failure display that indicates the detection of a failure when the timer (400) measures the elapse of a predetermined time shorter than the time required for information to make one round on the transmission path (2). A fault monitoring system comprising means (600).