JPH04249940A - Station abnormality monitoring device - Google Patents

Abstract

PURPOSE:To prevent noncoincidence in abnormal data from occurring by detecting abnormality from the abnormal data sent by message transmission from each station, and writing the abnormal data on a scan area for monitoring by a transmission/reception means. CONSTITUTION:A transmission/reception part 21 is provided at a station abnormality monitoring device 20. The transmission/reception part 21, when detecting the abnormality by receiving the abnormal data sent by the message transmission of a station 3, writes the abnormal data on the talker area 10 of the scan area 9 for monitoring. Therefore, it is possible to prevent erroneous detection from occurring even when the noncoincidence of a reception timing between the abnormal data by the message transmission of the station 3 and the abnormal data by scan transmission occurs.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a station abnormality monitoring apparatus for monitoring the occurrence of an abnormality at each station using message transmission at each station and scan transmission of data in a scan area.

0002

2. Description of the Related Art FIG. 3 is a block diagram of a station abnormality monitoring device. A station 3 is connected to the station abnormality monitoring device 1 via a transmission line 2 . Although a plurality of stations are connected to the station abnormality monitoring device 1 by forming a network through a transmission path 2, only station 3 is shown here for the sake of explanation. This station 3 is provided with an abnormality detection section 4 and a scan data area 5 is formed in the memory. A talker area 6 is formed in the scan data area 5. The talker area 6 is read out and data is transmitted under the transmission right of the station 3 itself. Further, when the abnormality detection section 4 detects an abnormality, it sends the abnormality data to the station abnormality monitoring device 1 through the transmission path 2 by message transmission, and writes the abnormality data into the talker area 6. The station 3 scans the data written in the scan data area 5 at predetermined intervals and sends it to the station abnormality monitoring device 1.

On the other hand, the station abnormality monitoring device 1 has a transmission/reception section 8, and a monitoring scan data area 9 is formed in the memory. This scan data area 9 has the same configuration as the scan data area 5 of the station 2, and a talker area 10 is formed therein. The transmission/reception unit 8 receives the message from the station 3, and if the message contains abnormal data, detects the occurrence of an abnormality in the station 3 and executes processing for the abnormality. Further, the station abnormality monitoring device 1 receives each data sent from the station 3 by scan transmission and writes each data into the scan data area 9. And station 3
The abnormal data is written to the talker area 10. Therefore, the station abnormality monitoring device 1 is connected to the talker area 10.
The occurrence of an abnormality in station 3 is detected from the abnormal data written in the station 3, and processing for the abnormality is executed.

However, since the station abnormality monitoring device 1 detects the occurrence of an abnormality at the station 3 by using both message transmission and scan transmission, there are cases where synchronization cannot be achieved between these message transmission and scan transmission. many. Therefore, even if the occurrence of an abnormality is detected from data transmitted by message transmission, the abnormal data may not be written to the talker area 10 by scan transmission at this time. As a result, the abnormal data in the message transmission becomes unconfirmed, and when the station abnormality monitoring device 1 compares the unconfirmed abnormal data with the data in the talker area 10, it determines that the data is normal even though an abnormality has occurred. Put it away.

[0005]

[Problem to be Solved by the Invention] As described above, since message transmission and scan transmission are not synchronized,
The abnormal data resulting from these transmissions becomes temporarily inconsistent.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a station abnormality monitoring device that can monitor the occurrence of an abnormality without causing discrepancies in the abnormal data transmitted by these transmissions even if message transmission and scan transmission are not synchronized. do.

[0007]

[Means for Solving the Problems] The present invention provides a
A station abnormality monitoring device that monitors the occurrence of an abnormality in each station by receiving each message transmission in the station and the scan transmission of each data stored in each scan area in each station has the same configuration as the scan area in each station and A monitoring scan area that stores data received through station scan transmission, and a transmission/receiving means that receives abnormal data sent through message transmission from each station, detects abnormality, and writes this abnormal data into the monitoring scan area. This is a station abnormality monitoring device that attempts to achieve the above object.

[0008]

[Operation] By providing such means, when an abnormality is detected by receiving abnormal data sent by message transmission from each station, the transmission receiving means writes this abnormal data into the monitoring scan area. This results in
Even if abnormal data is input through scan transmission, the abnormal data has already been written in the monitoring scan area.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Note that the same parts as in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is a block diagram of a transmission system to which a station abnormality monitoring device is applied. The station abnormality monitoring device 20 is provided with a transmission receiving section 21 . This transmission/reception section 21 has the following functions. That is, the function receives each data sent by the scan transmission of the station 3 and writes each data into the monitoring scan area 9. It detects abnormalities by receiving abnormal data sent by message transmission from station 3, and performs processing for this abnormality detection, such as setting an abnormal state table in which unconfirmed abnormal data is written, printing out changes in abnormal states, etc. function. This function writes abnormal data sent by message transmission from the station 3 to the talker area 10 of the monitoring scan area 9.

Next, the operation of the apparatus constructed as described above will be explained with reference to the monitoring flowchart shown in FIG. When the abnormality detection unit 4 of the station 3 detects an abnormality, it sends the abnormality data to the station abnormality monitoring device 1 through the transmission line 2 by message transmission, and writes the abnormality data into the talker area 6. Further, this station 3 scans the data written in the scan data area 5 at predetermined intervals and sends it to the station abnormality monitoring device 1.

On the other hand, the transmission receiving section 21 of the station abnormality monitoring device 1 receives a message from the station 3 in step s1, and if the message contains abnormal data, detects the occurrence of an abnormality in the station 3 in steps s2 and s3. Processing for abnormalities is performed, for example, setting an abnormal state table in which unconfirmed abnormal data is written, printing out changes in abnormal states, etc. Furthermore, the transmission/reception unit 21 writes abnormal data to the talker area 10 in step s4.

Next, the transmission receiving section 21 performs steps s5 and s.
At step 6, each data sent from the station 3 by scan transmission is received and written into the scan data area 9, respectively. At this time, the abnormal data written in the talker area 6 is the same as the abnormal data already written in the talker area 10. Thus, the station abnormality monitoring device 1 reliably detects the occurrence of an abnormality in the station 3.

In this way, in the above-mentioned embodiment, when an abnormality is detected by receiving abnormal data sent by message transmission from the station 3, this abnormal data is written in the talker area 10 of the monitoring scan area 9. Therefore, even if the reception timings of the abnormal data transmitted by the message transmission of the station 3 and the abnormal data transmitted by the scan transmission do not match, the occurrence of an abnormality in the station 3 can be reliably detected without erroneous detection. However, it is possible to detect the occurrence of an abnormality in station 3 even if only abnormal data is transmitted through message transmission, and even if abnormal data is received through scan transmission after receiving abnormal data through message transmission, the abnormal data transmitted through these transmissions do not match. , the occurrence of an abnormality at station 3 can be reliably detected. Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without changing the gist thereof. Naturally, a plurality of stations may be connected.

[0015]

[Effects of the Invention] As detailed above, according to the present invention, even if message transmission and scan transmission cannot be synchronized,
It is possible to provide a station abnormality monitoring device that can monitor the occurrence of an abnormality without causing inconsistency in the abnormal data transmitted.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a transmission system to which a station abnormality monitoring device according to an embodiment of the present invention is applied.

FIG. 2 is a monitoring flowchart in the same device.

FIG. 3 is a configuration diagram of a conventional device.

[Explanation of symbols]

2... Transmission path, 3... Station, 4... Abnormality detection unit, 5...
Monitoring scan area, 6, 10...talker area, 9...
Monitoring scan area, 20...Station abnormality monitoring device, 2...Transmission receiving unit.

Claims (1)

[Claims] 1. A station abnormality monitoring device that monitors the occurrence of an abnormality in each of the stations by receiving each message transmission in a plurality of stations and the scan transmission of each data stored in each scan area in each of the stations, A monitoring scan area that has the same configuration as the scan area in each station and stores data received through scan transmission from each station, and detects abnormalities by receiving abnormal data sent through message transmission from each station. A station abnormality monitoring device characterized by comprising: transmission/reception means for writing the abnormality data into the monitoring scan area.