JPH01277999A - State monitoring processing system - Google Patents

Abstract

PURPOSE:To detect the lack of monitoring information by allowing a master station to compare a difference between the monitoring numbers of two continuously received monitoring information and the number of continued states. CONSTITUTION:A slave station 1 receives a state signal from a terminal 11, a state changing point item output circuit 12 detects the monitoring item numbers (3, 5, 7...) of state changing points in the sending order of monitoring items, a state continuous number output circuit 13 detects the number of times of each state (off 3, on 2...) up to the monitor item number, and a sending circuit 14 periodically sends these information to the master station 2. The master station 2 inspects whether a number obtained by subtracting the number of continued states from the received monitor item number coincides with the monitor item number received immediately before the current reception. In case of lacking the monitor information of monitor item number 5 e.g., item number 7 - the number of continued states 2 = 5 not equal to preceding item number 3 is formed, so that the lacking of the item number 5 can be decided. In said constitution, timing formation and monitor between the slave and master stations can be omitted and the restriction of communication can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a status monitoring processing method in which a slave station device monitors the status of a plurality of monitoring items and sequentially transmits the monitoring information to a master station device. The present invention relates to a state monitoring processing method in which monitoring item numbers at state change points are sequentially sent to a master station device as monitoring information.

[Prior Art] Conventionally, there has been a status monitoring process in which a slave station device monitors the status of a plurality of monitoring items, and the parent station device monitors the status of each monitoring item by transmitting the monitoring information to the parent station device. The method is known. In this method, when the number of monitored items is very large, the amount of communication from the slave station device to the master station device increases, making it difficult to construct an efficient system.

Therefore, instead of sequentially assigning numbers to multiple monitoring items and transmitting all the status information of each monitoring item, we decided to change the status between monitoring items with adjacent numbers (hereinafter referred to as "state change"). A method has also been adopted in which only the monitoring item number (referred to as "point") and its status information are transmitted as monitoring information.

According to this method, since only the status of the monitoring item at the point of status change is transmitted, it has the advantage of good communication efficiency. In this method, the master station device can recognize the status of each monitoring item from the monitoring item number at the point of change in status and its status information transmitted from the slave station device.

[Problems to be Solved by the Invention] However, in the conventional status monitoring processing method described above, if monitoring information is missing, it becomes impossible for the master station device to recognize the status of each monitored item.

For this reason, conventionally, the slave station device transmits monitoring information at a predetermined cycle, and the master station device monitors the receiving cycle of the monitoring information using a time monitoring timer to detect missing monitoring information. was. Therefore, in the conventional system, the slave station device side sends monitoring information at fixed time intervals, and the master station device side has to time-monitor the received signal.
There is a problem in that communication constraints increase as the transmission timing between both stations needs to be generated and monitored.

The present invention has been made in view of such problems, and includes:
It is an object of the present invention to provide a state monitoring processing method that does not require generation and monitoring of transmission timing between a master station device and a slave station device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the slave station device that monitors the status of a plurality of monitoring items outputs the following monitoring information. In other words, the monitoring information includes the monitoring item number at the point of state change among the continuously assigned monitoring item numbers, the status information about this monitoring item number, and how many monitoring items the status indicated by this status information is. It is composed of the number of consecutive states indicating whether the state continues continuously. The master station device receives the monitoring information, recognizes the status of each monitoring item, and detects missing monitoring information from the received monitoring item number and the number of consecutive states.

[Operation] According to the present invention, in addition to the monitoring item number of the state change point and its state information, the number of consecutive states is added as monitoring information, so the master station device can, for example, Missing monitoring information can be detected by comparing the difference between the monitoring item numbers of the monitoring information and the number of consecutive states. Therefore, according to the present invention, it is not necessary to generate and monitor the transmission timing between the master station device and the slave station device.

[Example] Next, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing a system configuration of a state monitoring processing method according to an embodiment of the present invention. In this system, slave station device 1
, a master station device 2 , and a monitoring line 3 from the slave station device 1 to the master station device 2 . The slave station device 1 includes a status input terminal 11 for inputting a plurality of status signals to be monitored;
A state change point item number output circuit 12 that detects and outputs the monitoring item number of the state change point according to the transmission order of the monitoring items, and a continuous state number output circuit 13 that detects and outputs the number of consecutive states up to the above monitoring item number. and a transmitting circuit 14 that generates monitoring information based on the outputs of these circuits and periodically transmits it to the master station device 2. The master station device 2 also includes a receiving circuit 21 that receives the monitoring information, and a monitoring item status detection circuit 22 that detects the status of the monitoring item from the monitoring information received by the receiving circuit 21.

FIG. 2 shows the configuration of monitoring information from the slave station device 1 to the master station device 2. As shown in FIG. The monitoring information is composed of a monitoring item number at a state change point, state information, and the number of consecutive states.

In the above system, it is assumed that each monitoring item is in the state shown in FIG. 3. The slave station device 1 synchronously sends each monitoring information of the monitoring items (3, 5, 7, . . . ) at the state change point to the master station device 2 via the monitoring line 3. That is,
In the example of FIG. 3, as shown in FIG. 4, the state of monitoring item number 3 is "off" and the number of consecutive times is 3, the state of monitoring item number 5 is "on" and the number of consecutive times is 2, and the state of monitoring item number 7 is " Monitoring information is transmitted in sequence, such as "Off", consecutive number 2, and so on. By receiving this monitoring information string, the master station device 2 can determine that monitoring item numbers 1 to 3 are off, monitoring item numbers 4 and 5 are on, and monitoring item numbers 6 and 7 are off.

Next, with reference to FIG. 4, a description will be given of how missing monitoring information can be detected using the monitoring item number of the state change point and the number of consecutive states transmitted by this system. The master station device 2 verifies whether the number obtained by subtracting the number of consecutive states from the received monitoring item number matches the monitoring item number of the monitoring information received immediately before, and if it does not match, the monitoring information is missing. It is determined that there was. For example, in the example of Figure 4,
If the monitoring information for monitoring item number 5 is missing, when receiving the monitoring information for monitoring item number 7, (monitoring item number 7) -
(Number of consecutive states 2)=5≠(previous monitoring item number 3) Therefore, missing monitoring information for monitoring item number 5 can be detected.

In addition, especially in this system, since there are two possible states for a monitoring item: "on" and "off", even if one piece of monitoring information is missing, the monitoring item number in the subsequently received monitoring information The monitoring item number of the previous state change point can be reproduced by subtracting the number of consecutive states from the number. As a result, there is an effect that the monitoring information can be reproduced in its entirety.

In the above embodiment, the monitoring information is transmitted at regular intervals, but as described above, the present invention does not require timing generation and monitoring between the slave station device and the master station device. The monitoring information may be transmitted at irregular intervals.

[Effects of the Invention] As explained above, in the present invention, the monitoring item number of the state change point and the number of consecutive states are added to the monitoring information transmitted from the slave station device side to the master station device side. On the device side, missing monitoring information can be detected from the received monitoring item number of the state change point and the number of consecutive states. Therefore, there is an advantage that generation and monitoring of the transmission timing of monitoring information is not required between the slave station device side and the master station device side.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a status monitoring processing method according to an embodiment of the present invention, FIG. 2 is a configuration diagram of monitoring information, FIG. 3 is a diagram showing an example of a plurality of monitoring items and their status, and FIG. 4 2 is a timing diagram showing the transmission status of monitoring information. FIG. 1; slave station device; 2; master station device; 3: monitoring line 3;

Claims (1)

[Claims] (1) Monitor the status of a plurality of consecutively numbered monitoring items, and determine the monitoring item number of the point where the status of the monitoring item with adjacent numbers among the monitoring item numbers is changing;
Status information indicating the status of the monitoring item with this monitoring item number,
A slave station device that sequentially transmits monitoring information consisting of a continuous status number indicating how many monitoring items the status indicated by this status information continues, and a slave station device that receives the monitoring information and monitors each monitoring item. A state monitoring processing method comprising: a master station device that recognizes the state and detects a lack of the monitoring information from the received monitoring item number and the number of consecutive states.