JPH03107236A - Data gathering system - Google Patents

Abstract

PURPOSE:To gather a data from each slave station equipment without missing and to reduce a data gathering period by providing a processing end discrimination means discriminating whether or not the processing of data returned from a slave station equipment of a request destination is finished. CONSTITUTION:A master station equipment 1 requests the data transmission in a prescribed order to each slave station equipment 2 and applies processing to the data returned from the equipment 2 requested. Moreover, a processing end discrimination means 100 provided to the equipment 1 discriminates whether or not the processing of the data returned from the equipment 2 requested is finished. When the means 100 discriminates the processing end of the data the equipment 1 requests the data transmission immediately to another equipment 2. Thus, when the equipment 1 finishes the processing of the data returned from each equipment 2, since the data gathering to the succeeding equipment 2 is immediately started, the data gathering period is reduced without causing the missing of the data. The data especially emphasizing the real time performance is effectively gathered.

Description

[Detailed Description of the Invention] [Summary] Regarding the improvement of the data collection method in the polling type data collection system, the present invention aims to shorten the data collection cycle as much as possible while collecting data from each slave station device without missing it. In the case where the master station device is provided with a processing completion determining means for determining whether processing of data returned from a requesting slave station device is completed, and the processing completion determining means determines that processing of the data is completed. Then, the next slave station device is configured to immediately request data transmission.

[Industrial application field]

The present invention relates to improvements in data collection methods in polling data collection systems.

[Conventional technology]

FIG. 4 is a diagram showing an example of a data collection system to which the present invention is applied, FIG. 5 is a diagram showing an example of a conventional master station device, and FIG. 6 is a diagram showing an example of a conventional data collection process. FIG.

In FIG. 4, a - group of master station devices 1 and an n group of slave station devices 2 (individual slave station devices are referred to as 2-i (where i is 1 to n)) are connected by a transmission path 3. The master station device 1 transmits information to each slave station device 2-i via the transmission path 3 in a predetermined order (for example, slave station devices 2-1, 2-2, . . . , 2
-n order), receives the data returned from the requesting slave station device 2, performs predetermined processing, and then sends the data to the next slave station device! 2-(i+1) is requested to send data.

4 to 6, the fixed timer value setting unit 11 has enough timer value to complete processing of the returned data after the master station device 1 requests each slave station device 2 to transmit data. polling time t,. (for example, 300 milliseconds).

In this state, at time t, the polling data transmitter 1
3 sends a transmission request signal r addressed to the slave station device 2-1 to the transmission line 3, and starts the fixed timer value setting section 11.

The activated fixed timer value setting section 11 is a timer (TM).
12 for polling time t,. Set.

The timer (TM) 12 receives the polling time t from the fixed timer value setting section 11. When t is set, time measurement starts and the polling time t is set. When t has passed, the timing is stopped and the time t□
(=1., +1..), the polling data transmitter 13 is activated.

The activated polling data transmitter 13 sends a transmission request signal r2 to the next slave station device 2-2 to the transmission line 3.

Thereafter, in the same manner, the transmission request signal r7 to the slave station device 2-n is sent out at time t□, and then the polling time is t.

After elapses, the master station device 1 again sends the transmission request signal r to the slave station device 2-1.

On the other hand, each slave station device 2 analyzes the transmission request signal ri arriving from the transmission path 3, and only the slave station device 2-i
If it is determined that the transmission request signal ri is addressed to -i, the required data d is collected and sent back to the master station y11 via the transmission line 3 at time tit.

In the master station device 1, when the polling data receiving section 14 receives the data d directly sent back from the slave station device 2-i and accumulates it in the data buffer 15, the received data analyzing section 16
extracts the data from the data buffer 15, and at time t
! When the predetermined processing is completed by 3, the data buffer 15
is left vacant.

Note that the received data analysis unit 16 analyzes the following slave station device 2- (i
Unless the processing of the data returned from the slave station device 2-1 is completed and the data buffer 15 is left in an empty state by the time data d i+1 is returned from the slave station device 2-(+1), the next slave station device 2-( The data d6.1 returned from the slave station device 2- (i+1) cannot be stored in the data buffer 15 and has to be discarded, and the data d!
, 1 will be missing.

However, the data collected by each slave station device 2-i is not necessarily uniform, and therefore the time required for each slave station device 2-i to collect data d and return it to the master station device 1, and the time required for the master station device Since the time required for 1 to process the data d returned from each slave station device 2-i is not constant, the polling time t. As mentioned above, even if data d is collected and returned under all the assumed conditions of each slave station device 2- It has been set with sufficient margin. Therefore, in many slave station devices 2-i, a considerable amount of free time occurs after the data buffer 15 becomes empty.

Furthermore, the master station device 1 collects data di for each slave station device 2-i at a data collection period tc (=t*aXn).

[Problem to be solved by the invention]

As is clear from the above description, in conventional data collection systems, the polling time t, is sufficient for the master station device 1 to collect and process the data d, from each slave station device 2-i. , and collects data d from each slave station device 2-i at a data collection cycle of 1c (=jp.xn).
Data collection period t. There was a problem that the process became long and accurate data d could not be collected.

SUMMARY OF THE INVENTION An object of the present invention is to collect data from each slave station device without causing any data to be lost, and to shorten the data collection cycle as much as possible.

[Means to solve the problem]

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

In FIG. 1, 1 is a master station device, and 2 is a plurality of slave station devices, which constitute a polling type data collection system.

Reference numeral 100 denotes processing completion determining means provided in the master station device 1 according to the present invention.

[Effect]

The master station device 1 requests each slave station device 2 to transmit data in a predetermined order, and processes the data returned from the slave station device 2 that is the request destination.

The processing completion determining means 100 determines whether the processing of the data returned from the requested slave station device 2 has been completed.

When the processing completion determining means 100 determines that data processing is complete, the master station device 1 immediately requests the next slave station device 2 to transmit data.

Therefore, as soon as the master station device finishes processing the data returned from each slave station device, it starts collecting data for the next slave station device, so the data collection cycle can be shortened without causing any data loss. This is especially effective when collecting data that emphasizes real-time performance.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a master station device according to an embodiment of the invention, and FIG. 3 is a diagram illustrating a data collection process according to an embodiment of the invention. Note that the same reference numerals indicate the same objects throughout the figures. In addition, the target data collection system is the 4th
As shown in the figure.

In FIG. 2, the processing completion determination means 1 in FIG.
00, a fixed count value setting section 101, a timer counter 102, a timer (TM) 103, a counting processing section 104, and a processing completion state monitoring section 105 are provided in the master station device 1.

The fixed count value setting section 101 is connected to the polling data transmitting section 1.
Each time it is started from 3, a predetermined fixed count value Xo
(for example, r30J) is set in the timer counter 102.

Further, the timer (TM) 103 continuously repeats time measurement,
Each time a predetermined unit time tu (for example, 10 milliseconds) is counted (t=t, t), the counting processing unit 104 is activated.

Each time the counting processing unit 104 is activated by the timer (TM) 103, the counting processing unit 104 subtracts the count value X set in the timer counter 102 by one (x=x−1), and
When detecting that the count value X of 02 becomes "0", the polling data transmitter 13 is activated.

In FIGS. 2 to 4, at time tll, the polling data transmitter 13 is activated and sends a transmission request signal r addressed to the slave station device 2-1 to the transmission path 3, and at the same time, the fixed count value setting unit 101 Suppose you start .

The activated fixed count value setting unit 101 sets the fixed count value x0 (=r30J) to the timer counter 102 as described above, and the count processing unit 104 sets the fixed count value x0 (=r30J) to the timer (TM) 10.
3, it is activated every unit time tu (=10 milliseconds) and subtracts the count value X of the timer counter 102 by one.

On the other hand, in the same way as described above, each slave station device 2 analyzes the transmission request signal r arriving from the transmission path 3, and only the slave station device 2-1 determines that the transmission request signal r is addressed to the white child station device 2-1. Then, the required data d is collected and sent back to the master station device 1 via the transmission path 3 at time t+z.

In the master station device l, the polling data receiving unit 14 receives the data d returned from the slave station device 2-1 in the same manner as described above.
, when received, it is stored in the data buffer 15 and the processing completion status monitoring unit 105 is activated.

As described above, the received data analysis unit 16 extracts the data d from the data buffer 15, and when the predetermined processing is completed by time t13, the data buffer 15 becomes empty.

On the other hand, the activated processing completion state monitoring unit 105 monitors the empty/full state of the data buffer 15 and
When it is detected that the timer counter 102 becomes vacant, the count value X of the timer counter 102 is forcibly set to "1".

Therefore, the counting processing unit 104 activated by the timer (TM) 103 next calculates the count value x (=r
lJ), the count value X becomes "0", so the count processing section 104 immediately sends the polling data transmission section 1
Start 3.

The activated polling data transmitter 13 transmits the data at time ttl.
Then, a transmission request signal rt for the next slave station device 2-2 is sent to the transmission line 3.

As described above, the master station device 1 sends data to the slave station device 2-1,
The polling time t□(=tz+j++) required from sending the transmission request signal r to sending the transmission request signal r2 to the next slave station device 2-2 is equal to
The time required for the master station device 1 to collect the data d and send it back to the master station device L (=tjj), and the time required for the master station device 1 to collect the data d and return it to the master station device L
, the time required to process (" L 13 'j +
z) and a margin time of less than 1 u unit time, which is the minimum necessary time.

Similarly, after sending the transmission request signal r to the slave station device 2-n at time t□, after the minimum necessary polling time ttsn has elapsed, the master station device l returns to the slave station device 2-n. 1, a transmission request signal r is sent to the terminal.

As is clear from the above description, according to this embodiment, the master station device 1 collects data d5 from each slave station device 'l-i,
Minimum polling time required to complete processing
Since only pi is allocated, the data collection cycle jc (=jpl+...+t□) for each slave station device 2-i
is also shortened to the necessary minimum.

For example, if the number n of slave station devices is "50" and if each slave station bag W2 has no data d to be collected at all, a polling time t of 60 milliseconds is required. Whereas the period tc = (30Q x 50) milliseconds = 15 seconds was required, in this embodiment the data collection cycle tc = (6° x 50) milliseconds = 3 seconds, which is a reduction of 12 seconds. .

Note that FIGS. 2 to 4 are only one embodiment of the present invention, and for example, the configuration of the processing completion determination means 100 is not limited to that shown in the figures, and many other modifications may be considered. However, the effects of the present invention remain the same in either case.

Furthermore, the configuration of the data collection system that is the object of the present invention is as follows:
It goes without saying that the invention is not limited to what is shown in the figures.

〔Effect of the invention〕

As described above, according to the present invention, in the data collection system, when the master station device finishes processing the data returned from each slave station device, it immediately starts collecting data for the next slave station device. The data collection cycle can also be shortened without causing data loss, which is particularly effective when collecting data where real-time performance is important.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a master station device according to an embodiment of the present invention, FIG. 3 is a diagram showing a data collection process according to an embodiment of the present invention, and FIG. FIG. 5 is a diagram showing an example of a data collection system to which the present invention is applied, FIG. 5 is a diagram showing an example of a conventional master station device, and FIG. 6 is a diagram showing an example of a conventional data collection process. In the figure, 1 is a master station device, 2 is a slave station device, 3 is a transmission line, 11 is a fixed timer value setting section, and 12 is a timer (TM)
, 13 is a polling data transmitting unit, 14 is a polling data receiving unit, 15 is a data buffer, 16 is a received data analyzing unit, 1.00 is a processing completion determination unit, 101 is a fixed count value setting unit, 102 is a timer counter, 103 104 is a counting processing section, and 105 is a processing completion state monitoring section. Diagram of the principle of the present invention Figure 1: Data collection according to the present invention (8R station equipment according to the present invention) Data collection system according to the present invention Figure 1: Data collection system from the uninvented East

Claims (1)

[Claims] A master station device (1) requests a plurality of slave station devices (2) to transmit data in a predetermined order.
), the master station device (1) determines whether processing of the data returned from the requested slave station device (2) has been completed. A processing completion determination means (100) is provided, and when the processing completion determination means (100) determines that data processing is completed, the next slave station device (2) is immediately requested to transmit data. Characteristic data collection method.