JPS63240147A - Status supervisory system - Google Patents

Abstract

PURPOSE:To reduce a status change data collection time at the production time of status change by allowing a center equipment to collect status data through time division transmission from plural terminal equipments in detecting the occurrence of status change in >=2 terminal equipments. CONSTITUTION:The center equipment 10 applies polling to plural terminal equipments 20 to collect the status data. The terminal equipment 20 is provided with an arithmetic processing section 201 and status data is sent to the equipment 10 while giving interruption to polling by the processing 201 at the occurrence of status change. The equipment 10 is provided with a start-stop error detection circuit 105, which detects the sending of the status change data simultaneously from >=2 equipments 20 among the plural equipments 20. When the circuit 105 detects the occurrence of the status change in >=2 equipments 20, the status data is collected from time division data transmission from the plural equipments 20 by using a request signal from the equipment 10. Thus, the status change collecting time at the occurrence of status change is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention 1 (Field of Industrial Application) This invention relates to a status monitoring system in a polling type data transmission system.

(Prior Art) As a conventional state monitoring method in a polling type data transmission system, there are, for example, those shown in FIGS. 9 and 10. In FIG. 9, 30 is a center device, and a plurality of terminal devices 40 #1 to #n are connected to the same transmission line 31 connected to the center device 30.

Then, as shown in FIG. 10(a), the center device 30
When polling signals R1 to Rn containing address data specifying terminal devices 40 are sequentially transmitted to all the terminal devices 40, each terminal device 40 can confirm that the address in the polling signal and its own address set in advance are When they match, as shown in FIG. 10(b), a data signal (hereinafter also referred to as return data) containing current status data or status change data is sent from the terminal @40 R+ ・D1 to Rn
-0n is automatically returned to the center device 30. In this way, the polling operation is simultaneously performed on all terminal devices 40 to monitor their status.

At this point, the polling time tp for each terminal device 40 #1 to #n is the transmission time tr of the polling signal.
Letting the return time of data No. 18 be trd, it is expressed by the following equation.

tp=tr+trd ・(+) Therefore, the collection time t of status change data for all terminal devices 40
cyc is expressed by the following equation, where n is the total number of installed terminal devices v140.

t c y c = t p x n
(2) The status monitoring method using the polling method described in F has the feature that since all the terminal devices 40 are polled sequentially, it is possible to simultaneously check the transmission status to see if there is an abnormality in the transmission path as well as the status monitoring. ing.

(Problem to be Solved by the Invention) In the conventional condition monitoring system, the collection time tcyc of condition change data is proportional to the total number of installed terminal devices, as shown in equation (2) above. However, as the number of installed terminal devices increases, there is a problem in that it takes a lot of time to collect status change data when a status change occurs.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a condition monitoring method that can shorten the time required to collect condition change data when a condition change occurs without impairing the features of the condition monitoring method using the polling method. With the goal.

"Structure of the Invention" (Means for Solving the Problems) In order to solve the above problems, the present invention provides a method for polling a plurality of terminal devices from a center device to collect status data. Each of them is provided with means for transmitting state change data to the center device through the polling when a state change occurs; Simultaneous state change detection means for detecting that state change data has been transmitted is provided, and when the simultaneous state change detection means detects that a state change has occurred in two or more terminal devices at the same time, the center device The gist of the present invention is to collect status data from the plurality of terminal devices by time-division data transmission in response to a request signal from the terminal device.

(Function) When a change in status occurs in any one terminal device among multiple terminal devices, that is, when an individual status change occurs, an interrupt occurs in polling and the status transmitted from the terminal device where the status change occurs is generated. The variable data is transmitted to the center device. Therefore, the collection time of condition change data is approximately the same as the polling time tp in equation (1) above, and the collection time is significantly 5.
．． It is reduced by N.

In addition, if a change in status occurs in two or more terminal devices at the same time,
That is, when a multi-city situation occurs, this is detected by the simultaneous situation detection means, and state data is collected by time-division data transmission from a plurality of terminal devices in response to a request signal sent from the center device. Therefore, at this time, the transmission time tr of the polling signal from the center device (terminal device (n)
-1>G'j The time for collecting condition change data is shorter than that of the conventional example.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 6 are diagrams showing an embodiment of the present invention.

First, the configurations of the center device and terminal device applied to this embodiment will be explained using FIG. 1 and FIG. 2. 1st
The figure shows the center device 10, in which 101
is an arithmetic processing unit, and the arithmetic processing unit 101 includes a function of transmitting a bulk data request signal, which will be described later. 102 is a serial input/output circuit, and this circuit receives polling data, which is transmission data, or return data, which is reception data.
These convert data into parallel data/serial data or serial data/parallel data, respectively. 103 is a modulation/demodulation circuit, and this circuit modulates the serial data consisting of binary signals of rOJ and rIJ converted by the serial input/output circuit 102 into a frequency modulation signal corresponding to the rOJl'IJ, or vice versa. There is one for demodulating. 104 is a carrier detection circuit, which detects a frequency modulated signal and determines the presence or absence of received and transmitted data.

Reference numeral 105 denotes a start-stop error detection circuit as a simultaneous state abnormality detection means, and this detection circuit determines whether an error has occurred in the message of received data converted by the serial input/output circuit 102. An error in the message occurs, for example, when status change data is received from multiple terminal devices at the same time. Reference numeral 106 denotes a time counting circuit, and this circuit measures a certain period of time during which the arithmetic processing unit 101 is in a state of receiving data, for example.

Further, FIG. 2 shows the terminal device 20, and in the same figure, 201 is a calculation processing unit, and this calculation processing unit 201 interrupts polling when a condition occurs and sends the data to the center device 10.
Means for transmitting the state change data is configured. 202
is a serial input/output circuit, 203 is a modulation/demodulation circuit, 204 is a carrier detection circuit, 206 is a time count circuit,
These circuits 202 to 206 are connected to the center device 11i.
It has almost the same functions as those provided in o. Further, 207 is a status input circuit, and this circuit is connected to the switch 2.
This is a circuit that collects contact state data etc. of 09.

208 is a terminal address setting circuit, and the address (#1 to #n) of the terminal device 20 is set by this circuit.

Next, the operation will be explained using FIGS. 3 to 6. Third
The figure is a timing chart for explaining the action when a single abnormality occurs, FIG. 4 is a timing chart for explaining the action when a multiple abnormality occurs, and FIG. 5 is a timing chart for explaining the action of the center device 10. The flowchart in FIG. 6 is a 70-diagram diagram for explaining the operation of the terminal device 20.

Below, the functions of the center equipment @ 10 and each terminal device 20 will be explained.
(a) When there is no change in the condition, (b) When an individual change occurs and (
c) Explain each case separately when multiple changes occur.

(b) If there is no change in condition.

Polling signals R1 to Rn containing address data of each terminal device 20 are sequentially transmitted from the center device 10, and the terminal bag fff 20 is cyclically polled in the order of terminal device #1 → terminal device #2 → etc. Status data is collected (Figure 5, steps 1-3).

(b) When an individual condition occurs.

Assume that a change in status occurs in the terminal device #m in FIG. 3(b). After receiving the polling data (6th
(Fig. 1, Step 16), if the address address does not match (Fig. 1, Step 18), and if there is a change in condition (Fig.
Step 21), following the return data from another terminal device (terminal device #3 in the example of FIG. 3(t)), the carrier detection circuit 204 detects terminal device #3 on the transmission path in step 22 of FIG. After confirming that the returned data of 3 no longer exists, interrupt polling and send status change data Rm - [)
m is transmitted (FIG. 6, step 23).

On the other hand, in the center device 10, during a reception wait state within a certain period of time after receiving the return data R3 and D3 during polling (step 4 in FIG. 5), the carrier detection circuit 104 detects the presence of received data (the same In step 5 of the figure, status change data of terminal device #m is received. After receiving the status change data of terminal device #m, polling of the remaining terminal devices is subsequently performed to collect status data (see Fig. 5).
Steps 12-14).

As described above, in this embodiment, the status change data is sent to the center device 10 by interrupting polling due to the terminal transmission from the terminal device where the status change has occurred, so the collection time of the status change data is shorter than the above-mentioned time. The time required for polling is about tp, which is significantly shorter than the condition change data collection time tcyc of the conventional example.

(c) When multiple deterioration occurs.

In (ω, (C) in FIG. 4, two terminal devices #m1
Assume that a change in condition occurs at the same time in #n. In the example of FIG. 4, terminal devices #m and #n in which a change in status has occurred interrupt polling and transmit status change data Rm-Dm and Rn-Dn at the same time, following the transmission of return data from terminal device #4. Ru.

In the center device 10, the return data R from the terminal device #4
4.Successively to D4, the above state change data Rm-Dm and Rn-[)n are received, but since the two state change data are received at the same time, the start-stop error detection circuit 105, which is a simultaneous state change detection means, A received data error is detected (FIG. 5, step 8). After the error is detected, further data request signals R1 to X are sent to all terminal devices under the control of the logic processing section 101 (step 9 in the figure).

On the other hand, each terminal device that has received the data request signal in step 17 of FIG.
The transmission time is proportional to the preset self-address (
The current status data is transmitted after the terminal reception interval [W x (address - 1)) has elapsed (Fig. 6, Step 2).
/I~26).

In this way, the status change data of all the status change occurrence terminal devices are
The data are collected in the center device 10 by time-division data transmission (FIG. 5, step 11).

As described above, when multiple abnormalities occur, in this embodiment, condition change data is collected by time-division data transmission. The data collection time is reduced by the amount of the polling signal transmission time trx (terminal device (n)-1) J from the center device compared to the conventional example.

Next, FIGS. 7 and 8 show other embodiments of the present invention. This embodiment shows a state monitoring method when there are terminal devices #2 and #4 that are not connected to the data transmission system.

As described in the above embodiment, when a multiplex event occurs, each terminal device 20 manages its own transmission waiting time and transmits return data using further data request signals R1 to X from the center device 10. Gyo Natsu-C is here. Therefore, if there are unconnected terminal devices #2 and #4 as in this embodiment, the transmission times t2 and t4 of the terminal devices #2 and #4 are added to the return data collection time, resulting in loss of data. Time occurs.

Therefore, in this embodiment, as a means to avoid this,
The order in which the returned data is transmitted is set appropriately in advance when further data is requested from the center device 10.

That is, in the example of FIG. 8(B), when requesting bulk data,
The call order is such that terminal device #1 has the first call priority, terminal device #3 has the second call priority, and so on.
2, the transmission order is set by skipping #4.

In this way, in this embodiment, since the transmission time of unconnected terminal devices is further shortened when a data request is made from the center device, the time for collecting condition change data when a condition change occurs is further shortened.

[Effects of the Invention] As explained above, according to the present invention, when a change in status occurs in any one of a plurality of terminal devices, a call is sent from the terminal unit where the change in status occurs. Status change data interrupts polling and is transmitted to the center device. Furthermore, when a change in status occurs in two or more terminal devices among the plurality of terminal devices at the same time, state data is collected from the plurality of terminal devices by time-sharing data transmission in response to transmission of a request signal from the center device. Therefore, even when any of the above types of status changes occur, there is an advantage that the time required to collect status change data when a status change occurs can be shortened without sacrificing the features of the polling type status monitoring system. .

[Brief explanation of drawings]

1 to 6 show an embodiment of the status monitoring system according to the present invention, in which FIG. 1 is a block diagram showing the configuration of a center device, FIG. 2 is a block diagram showing the configuration of a terminal device, Fig. 3 is a timing chart for explaining the action when a single abnormality occurs, Fig. 4 is a timing chart for explaining the action when a multiple abnormality occurs, and Fig. 5 is for explaining the action of the center device. 6 is a flowchart for explaining the operation of the terminal device, FIG. 7 is a block diagram of a device applied to another embodiment of the present invention, and FIG. 8 is a flowchart for explaining the operation of the other embodiment of the same. FIG. 9 is a block diagram of a device applied to the conventional state monitoring system, and FIG. 10 is a timing chart for explaining the operation of the conventional system. io: terminal device, 20: terminal device, 101
: Arithmetic processing unit having a function of transmitting a request signal, 105: Start-stop error detection circuit (simultaneous state change detection means), 201: Arithmetic processing unit constituting means for transmitting state change data by interrupt/ν in polling, 207 : Status input circuit.

Claims (1)

[Scope of Claims] In a method in which a center device polls a plurality of terminal devices to collect status data, each of the terminal devices has a function that interrupts the polling when a status change occurs and sends status change data to the center device. a simultaneous state change detection means for detecting simultaneous transmission of state change data from two or more terminal devices among the plurality of terminal devices; When the simultaneous status change detection means detects that a status change has occurred in two or more terminal devices at the same time, status data is collected from the plurality of terminal units by time-division data transmission in response to a request signal from the center device. A condition monitoring method characterized by: