JPH11239164A - Network monitor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network monitor system which can efficiently monitor in such a way that processing of a slave station is not disturbed nor interrupted by a command addressed to some other route. SOLUTION: A network monitor system having an alarm monitor function to which a master station and slave stations are multidrop-connected through SCBI interfaces is provided with a master station 101 which issues commands having PID numbers, slave stations 105 having the PID numbers which analyze and respond to the command from the master station 101, and repeaters 102-104 which are set up between the master station 101 and slave stations 105 to perform signal amplification, etc. Each repeater 102-104 is composed of a driver 110 which amplifies transmitting and received signals, a CPU 111, and a table 114 containing a flag 112 indicating that some other route is being detected, another flag 113 indicating that its own repeater is being detected, a data transfer buffer, etc., and only transmits a command to a required route by monitoring command/response data passing through the above-mentioned route in the repeater and rewriting the table 114 in accordance with the responding station of its own slave station 105.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a master station for controlling the state of various systems and an SCB for the master station.
A plurality of slave stations which are connected by multi-drop connection by I (Serial Control Bus Interface) and control various system peripheral devices, and a repeater which is arranged in a path connecting the master station and each slave station and performs signal amplification and the like, The present invention relates to a network monitoring system having a monitoring function for detecting an abnormality of each part of the system.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. H06-334659 is one of documents which disclose this kind of conventional technology. "Network interconnection device" described in this publication
Is a network interconnection device NB as shown in FIG.
In 2, when a source routing frame is received from the port P1, it is determined whether the frame is a route search frame or a response frame to the route search frame. If the frame is not a frame at the time of the route search, a normal source routing process is performed. If the frame is a route search frame, the received port P1 side SR
The address registered in the terminal table SRT1 and the destination address of the received frame at the time of the route search are compared by the SRP route search processing unit NSP of the source routing processing unit, and a match is registered in the SR terminal table SRT1. If so, the received frame is discarded.

As another document, Japanese Patent Application Laid-Open No. 64-54953 is known.
There is an official gazette. "Repeater" shown in this gazette
Is, as shown in FIG. 4, a bus type LA of a carrier monitoring multiple access system (CSMA / CD system) with a collision detection function.
N, gating packets on the same cable and between two cables according to the destination address of the received packet, and, if a collision occurs on the cable, packets for the cable and other cables Is to be cut off.

The above two prior arts relate to a method focusing on a search frame and a monitoring multiple access method with collision detection. However, since the SCBI interface does not have a search frame or collision detection function, a multi-drop connection using the SCBI interface is performed. It is difficult to apply it to an alarm monitoring device.

[0005] In an alarm monitoring device that performs multi-drop connection by an SCBI interface, a master station that controls a slave station having physical numbers PIDo to n and PIDo to receive and analyze / respond a command issued by the master station. It is composed of n slave stations and a repeater that is installed between slave stations remote from the master station and amplifies electric signals and the like.

[0006] A driver for transmission / reception is provided in the repeater, and a signal issued by the master station is temporarily received, amplified by the driver, and transmitted to a slave station at a remote place. Also, a signal in response to a remote slave station is received by a driver in the repeater, amplified, and transmitted to the master station.

[0007]

The above-described conventional multi-drop connected alarm monitoring device repeats the following operation. That is, the command issued by the master station is PI
All the slaves Do to n receive and receive the CPU in the slave station.
And analyze the command to determine whether the command is directed to the own station.
If the command is addressed to the own station, response data is generated and transferred to the master station. If the command is not the command of the own station, the command is discarded, and the alarm monitoring processing which has been executed so far is continued.

As the size of the system increases, the number of slave stations connected to the master station increases, and the number of slave stations increases. As a result, the probability of receiving a command not addressed to the own station increases, and as a result, useless processing not directly related to the monitoring processing for the slave station has been performed.

An object of the present invention is to provide a network monitoring system in which the processing of the slave station is not disturbed or interrupted by a command addressed to another route, no wasteful processing is performed, and efficient monitoring processing can be performed. It is to provide a system.

[0010] Another object of the present invention is to provide: It is possible to speed up the reaping of data in the slave station, and even if the system increases,
It is an object of the present invention to provide a network monitoring system capable of quickly transferring data in a slave station to a master station.

[0011]

In order to solve the above-mentioned problems, a network monitoring system according to the present invention has the following characteristic configuration.

(1) A network monitoring system according to the present invention is a network monitoring system having an abnormality monitoring function in which a master station and a slave station are connected in a multidrop manner by an SCBI interface. The master station issues a command having a PID number. A slave station having an identification PID number for receiving and analyzing / responding a command from the master station, and a repeater installed between the master station and the slave station for amplifying an electric signal or the like, The repeater includes a driver for amplifying a transmission signal and a reception signal, a CPU, a table including a flag indicating that another route is being detected, a flag indicating that the own repeater is being detected, a data transfer buffer, and the like, and has an SCBI interface path within the repeater. Monitors the passing command / response data and stores the data in the repeater. By rewriting the Le according to the response state of the slave station, and is configured to transmit a command only to the required path.

(2) The network monitoring system according to the present invention is the monitoring system according to (1), wherein the repeater monitors a response from a slave station connected to the repeater and connected to a preceding stage of the repeater. The existence of the slave station is identified for each PID number, and transmission of an unnecessary command is prohibited.

(3) The network monitoring system according to the present invention is the monitoring system according to (1), wherein the repeater, when receiving the command, refers to the other route detection flag from the table in the repeater and uses the other route detection flag. If the PID is being detected, the command is not transmitted to the slave station under the repeater.
The slave station under the repeater is configured not to perform useless processing.

(4) The network monitoring system according to the present invention is the monitoring system according to (1), wherein the repeater cuts a data transfer request from a slave station under the repeater and accumulates the request in a data transfer buffer in the repeater. This speeds up the data pruning of the slave station.

(5) The network monitoring system of the present invention is the monitoring system of (1), wherein the repeater is detecting its own repeater in the repeater when receiving an interrupt break signal as a data transfer request from the slave station. Referring to the flag, the slave station being detected and the registered slave station are sequentially searched to trim the transfer data, accumulate in the data transfer buffer in the repeater, and transfer the interrupt break signal to the master station. By
Speed up the data transfer buffer pruning of the slave station.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a network monitoring system according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a network monitoring system according to an embodiment of the present invention.

As shown in FIG. 1, a master station 101 which controls the state of the system and a plurality of slave stations 105 which are located at remote locations and control peripheral devices of the system are SCBI.
(Serial Control Bus Interface) for multi-drop connection. In order to enable data transmission between remote locations, repeaters 102, 103,... Having a signal amplification function and the like are arranged in a path connecting the master station 101 and each slave station 105. By each of these repeaters 102, 103,...
06 (OJ), 107 (KL), 108 (MN), 10
9 (OW), etc., and a plurality of slave stations 105 are connected in groups for each path.

By the way, each of the repeaters 102, 103,.
Includes a driver 110 for amplifying an electric signal and a CPU
(Central processing unit) 111 and a table 114 including a flag 112 for detecting the other route, a flag 113 for detecting the repeater itself, a data transfer buffer, a data buffer switch, and the like.

FIG. 2A shows the format of a command command issued by the master station 101. As shown in the figure, the format of the command command includes a physical number that designates one or all of the plurality of slave stations 105, that is, a “PID number” and “data”.
For example, when PID = 0 to W is designated, one slave station 105 unique to the number is designated, and when PID = X to Z is designated, all slave stations 105 having PID = O to Z are designated.
Is specified.

Now, when the master station 101 issues a command specifying PID = J, the CPU 1 of the repeater 102 (0)
Numeral 11 receives a command issued by the master station 101 from the path 106 (0J). Then, P
The history of ID = J is checked, and the other route detection flag 112 is set to “J = 0”, and the own repeater detection flag 113 is set to “J =
0 ”means that the PID has no access record
Is determined, the command signal is amplified by the driver 110 and transmitted to the path 107 (KL).

When the slave station 105 connected to the path 106 (0J) responds to the command, the repeater 10
2 (0) recognizes that the slave station 105 (PID = J) is on the route 106 (0J), and stores it in the table 114 by setting the other route detection flag 112 to “J = 1”. Since no response is returned on the route 107 (KL), the own repeater detection flag 113 (J) remains "0".

The master station 101 returns to the slave station 105
(PID = J), the repeater 102
(0) is not transmitted on the route 107 (KL) because the other route detection flag 112 is “J = 1”. Therefore, the command is transmitted only on the path 106 (0J).

Next, when the master station 101 issues a predetermined command by designating PID = N, the C of the repeater 102 (0)
The PU 111 is connected to the master station 10 from the path 106 (0J).
1 receives the command issued. The history of PID = N is checked from the table 114, and the other route detection flag 11
2 is “N = 0”, and the own repeater detecting flag 113 is “N”.
= 0 ”, PIs that have no access record until now
If it is determined to be D, the command signal is amplified by the driver 110 and transmitted to the path 107 (KL). Then, the repeater 103 (1) operates in the same manner, and the path 108 (M
N) Transmit the command signal up.

When the slave station 105 (PID = N) connected to the path 108 (MN) responds to the command, the repeater 103 (1) amplifies the signal and
07 (KL) and the slave station 105 (PID =
N) is recognized to be after the path 108 (MN), the self-repeater detection flag 113 is set to “N = 1”, and stored in the table 114.

Similarly, the repeater 102 (0) amplifies the signal and transmits the amplified signal to the path 106 (0J).
The fact that 5 (PID = N) exists after the path 107 (KL) is stored in the table 114 by setting the own repeater detection flag 113 to “N = 1”.

The master station 101 returns to the slave station 105
(PID = N), the repeater 102
(0), the repeater 103 (1) sequentially transmits the signal to the next stage because the own repeater detection flag 113 is “N = 1”, and the remote slave station 105 (PI)
D = N) and transmits the amplified response data to the master station 101.

The hot swap maintenance is performed, the system configuration is changed, and the slave station 105 (PID = J) is routed through the path 106.
If you move from (0J) to route 107 (KL),
In this state, the repeater 102 (0) is connected to the slave station 105.
The command of (PID = J) is not transmitted to the route 107 (KL), and cannot respond to the master station 101.

The operation of updating a table in a repeater will be described below. The master station 101 is connected to the slave station 105 (P
ID = J), the slave station 105 (P
Since ID = J) was under the control of the repeater 102 (0) until the transfer, the table 114 of the repeater 102 (0)
The other route detection flag 112 is “J = 1” and is not transmitted on the route 107 (KL), and the master station 101 recognizes that a down event has occurred in the slave station 105 (PID = J). .

The repeater 102 (0) is also connected to the path 106 (0
J) Recognizing from above that the slave station 105 (PID = J) has gone down, the other route detection flag 112 is set to “J =
0 ".

The master station 101 receives a request from the slave station 105 (P
When the command is resent to ID = J) to confirm the recovery, another route detection flag 1 in repeater 102 (0) is set.
Since “12” is “J = 0”, the command is transmitted to the path 107 (KL). Slave station 105 (PI
D = J) responds, sets the own repeater detection flag 113 in the repeater 102 (0) to “J = 1”, and returns a response signal to the master station 101.

Since the change of the system configuration is performed under the recognition of the operator, the update of the table in the repeater issues an initialization command from the master station 101 by operating the master station 101 after the system configuration is changed. It can be done by things.

FIG. 2B is a diagram showing a format of the initialization command command. As shown, the initialization command command is a broadcast notification command issued by the master station 101. When the PID number is, for example, X to Z, it indicates a command indicating all PIDs. There is no response from the sending slave station 105.

Repeater 102 (0) and repeater 103
In (1), upon receiving the initialization command command, the command is unconditionally transmitted to the path 107 (KL) and the path 108 (MN), and all the slave stations 105 (PID = 0 to N) receive the command.

The initialization command is transmitted to each slave station 10.
5 is returned to the initial state, the tables of the repeater 102 (0) and the repeater 103 (1) are all cleared and the other route detection flag 112 is set to "= 0", and the own repeater detection flag 113 is set to "= 0". By doing so, the table can be reconfigured.

Thus, the master station 101 sets PID = J
Is issued, the repeater 102 (0) transmits the command to the path 107 (KL), and the relocated slave station 105 (PID = J) can respond.

Next, a description will be given of the operation when data is transferred when an event occurs to notify the master station 101 from the slave station 105 on the path 107 (KL).

At the time of system construction, the data buffer switches of the repeaters 102 (0) and 104 (2) connected to the first stage from the master station 101 are turned on, and the second and subsequent stages are connected. Repeater 103 (1)
Data buffer switch is turned off.

When an event occurs in which the slave station 105 (PID = K) transfers data to the master station 101, the slave station 105 (PID = K) generates an interrupt break signal and notifies the repeater 102 (0). The break signal is generated by setting the data transmission signal to the “L” level for a certain period of time.

The repeater 102 (0) detects the break signal, and when the data buffer switch is ON,
The slave station 105 that issues a scan command to the slave station 105 that recognizes the own repeater detection flag 113 “= 1” from the subordinate PIDs = K to N, and requests data transfer (PID = K) , And the data is sequentially cut off and stored in the table transfer data K in the repeater 102 (0).

When the break signal is further detected after the data pruning, the repeater 102 (0) again returns to the subordinate PID.
= From K to N, the own repeater detecting flag 113 “=
Issue a scan command to the slave station 105 that recognizes "1", and request the data transfer.
(PID) is calculated, and the data is sequentially trimmed and stored in the intra-repeater table transfer data.

The repeater 102 (0) is connected to the master station 101
The master station 101 detects a break signal and sends a scan command to the slave station 105.
(PID = 0 to N).

The slave station 105 (PID = 0 to J)
Since no break signal has been generated, information indicating no interruption is returned.

When the repeater 102 (0) receives the scan command, it does not transmit the scan command to the subordinate slave stations 105, but sequentially responds to the contents of the data transfer information in the table, and transfers the data to the master station 101. Master station 101
When the data transfer to the table is completed, the transfer data in the table is cleared.

Next, an event occurs in which the slave station 105 on the route 108 (MN) notifies the master station 101,
The operation of transferring data will be described.

When an event occurs in which the slave station 105 (PID = N) transfers data to the master station 101, the slave station 105 (PID = N) generates an interrupt break signal and notifies the repeater 103 (1).

The data buffer of the repeater 103 (1)
Since the switch is OFF, the break signal on the path 108 (MN) is transmitted to the repeater 102 (0) as it is.

The repeater 102 (0) detects the break signal, and sets the own repeater detection flag 113 "= 1" from among the subordinate PIDs = K to N when the data buffer switch is ON. Recognized slave station 105
The slave station 105 (PID = N) requesting the data transfer by generating a scan command is determined, and the data is sequentially cut and stored in the table transfer data N in the repeater 102 (0).

When the break signal is further detected after the data pruning, the repeater 102 (0) returns to the subordinate PID =
From among K to N, the own repeater detecting flag 113 “=
1), and issues a scan command to the slave station 105 that recognizes the data transfer request.
ID), sequentially cut the data, and store it in the table transfer data in the repeater.

The repeater 102 (0) is connected to the master station 101
The master station 101 detects a break signal and sends a scan command to the slave station 105.
(PID = 0 to N).

The slave station 105 (PID = 0 to J)
Since no break signal has been generated, information indicating no interruption is returned.

When the repeater 102 (0) receives the scan command, it does not transmit the scan command to the subordinate slave stations 105, but sequentially responds to the contents of the data transfer information in the table, and transfers the data to the master station 101. Master station 101
When the data is transferred to, the transfer data in the table is cleared.

Next, the route 107 (KL) and the route 108
(MN) and an event to be notified from the plurality of slave stations 105 on the route 109 (OW) to the master station 101,
The operation of transferring data will be described.

A plurality of slave stations 105 with PID = K to W
However, when an event of data transfer to the master station 101 occurs, the slave station 105 (PID = K to W) generates an interrupt break signal and notifies the repeater 102 (0 to 2).

The data buffer of the repeater 103 (1)
Since the switch is OFF, the break signal on the path 108 (MN) is transmitted to the repeater 102 (0) as it is.

Repeater 102 (0) and repeater 104
(2) Detects a break signal and turns on the data buffer switch, so that the slave station 105 that recognizes the own repeater detection flag 113 “= 1” from the subordinate PID = K to W is detected. The slave station 105 (PID) which issues a scan command and requests data transfer is determined,
The data is sequentially cut and stored in the table transfer data K to W in the repeater 102 (0) and the repeater 104 (2).

When a break signal is further detected after data pruning, the repeater 102 (0) or the repeater 104
(2) is the slave station 10 recognizing the own repeater detection flag 113 “= 1” from the subordinate K to W again.
5, the slave station 105 (PID) requesting the data transfer is issued to the slave station 105, and the data is sequentially cut off and stored in the table transfer data in the repeater.

The repeater 102 (0) or the repeater 10
4 (2), when the scan command is completed, the master station 10
Send an interrupt break signal to 1. Master station 101
Detects the break signal and sends a scan command to the slave station 105 (PID = 0 to W).

The slave station 105 (PID = 0 to J)
Since no break signal has been generated, information indicating no interruption is returned.

When the master station 101 issues a scan command of PID = K to N, the repeater 102 (0) does not transmit the scan command to the subordinate slave stations 105 and sequentially responds to the contents of the data transfer information in the table. And the master station 10
Transfer data to 1. When data is transferred to the master station 101, the repeater 102 (0) clears the transfer data in the table.

Similarly, when master station 101 has PID = 0
~ W is issued, the repeater 104
In (2), the scan command is not transmitted to the subordinate slave station 105, but the contents of the data transfer information in the table are sequentially responded and the data is transferred to the master station 101. Master station 101
When the data is transferred to the table, the repeater 104 (2) clears the transfer data in the table.

[0063]

According to the present invention, a network monitoring system having the following effects can be obtained.

In this network monitoring system,
It is monitored whether the destination of the command issued in the SCBI connection system is under the repeater or on another route. Then, the command determined to be another route is discarded, and transmission to the subordinate of the repeater is not performed. Therefore, the processing of the slave station does not have to be disturbed by a command addressed to another route. In other words, even if a command is issued from the master station to a PID slave station existing on another path, the command is not transmitted to the path, so that processing in the slave station on the path need not be interrupted, and No processing is performed. Thus, efficient monitoring can be performed.

In this network monitoring system,
When data to be transferred from the slave station to the master station is generated and an interrupt break signal is output, the repeater cuts the data in the slave once and then transfers it to the master station, so that the data cutting in the slave station can be speeded up. . Thus, even if the system increases, it is possible to avoid a delay in transferring data in the slave station to the master station,
Data in the slave station can be quickly transferred to the master station.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a network monitoring system according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing a format of a command issued by a master station of the network monitoring system according to an embodiment of the present invention, wherein FIG. 2A shows a format of a normal command command, and FIG. FIG. 3 is a diagram showing a format of the file.

FIG. 3 is a diagram showing a schematic configuration of a “network interconnection device” according to a first conventional example.

FIG. 4 is a diagram showing a schematic configuration of a “repeater” according to a second conventional example.

[Explanation of symbols]

 101 Master station 102 Repeater (0) 103 Repeater (1) 104 Repeater (2) 105 Slave station 106 Route (0J) 107 Route (KL) 108 Route (MN) 109 Route (OW) 110 Driver 111 CPU 112 Detecting other routes Flag 113 Self-repeater detection flag

Claims (5)

[Claims] In a network monitoring system having an abnormality monitoring function in which a master station and a slave station are multi-drop connected by an SCBI interface, a master station that issues a command having a PID number and receives a command from the master station For analysis and response
A slave station having an ID number, and a repeater installed between the master station and the slave station for amplifying an electric signal or the like, wherein the repeater amplifies a transmission signal and a reception signal, and a CPU; A table including a flag indicating that another route is being detected, a flag indicating that the own repeater is being detected, a data transfer buffer, and the like. The command / response data passing through the SCBI interface path is monitored in the repeater, and the table in the repeater is used as a slave station. A network monitoring system configured to transmit a command only to a necessary route by rewriting in accordance with a response state of the network monitoring system. 2. The repeater monitors responses from slave stations connected to the repeater and a preceding stage of the repeater, identifies the existence of the slave station for each PID number, and transmits an unnecessary command. 2. The network monitoring system according to claim 1, wherein the network monitoring system is configured to prohibit the network monitoring. When the repeater receives the command, the repeater refers to the other route detection flag from a table in the repeater,
If the PID is detected by another route, the command is not transmitted to the slave station under the repeater, and the slave station under the repeater is configured not to perform useless processing. 2. The network monitoring system according to 1. 4. The repeater cuts a data transfer request from a slave station under the repeater and accumulates the data transfer request in a data transfer buffer in the repeater, thereby speeding up the data cutting of the slave station. The network monitoring system according to claim 1, wherein 5. When the repeater receives an interrupt break signal as a data transfer request from the slave station, the repeater refers to the own repeater detection flag in the repeater and determines the slave station being detected and the registered slave station. The data transfer buffer in the slave station is speeded up by successively searching and trimming the transfer data, storing the cut data in the data transfer buffer in the repeater, and transferring the interrupt break signal to the master station. The network monitoring system according to claim 1.