JPS62188528A - Cyclic information transmission system - Google Patents

Abstract

PURPOSE:To decrease the data updating interval by sending only a required word address without sending an undesired word address. CONSTITUTION:In the cyclic information transmission system sending cyclicyl the information from the 1st station to the 2nd station in time division multiplex, the 1st station has a table storing the information scheduled for the transmission corresponding to the word address and when the sent information takes place, only the address added with the sent information is included in a transmission format and sent to the 2nd station. Concretely. SYNC and synchronizing words W(a), W(b), W(c) are word addresses having the sent information in the operating transmission format and the values are optional. Thus, the only the word address required to be sent, that is, only the word address having the sent information is included in the transmission format in such a way and the word address without the sent information is not included in the transmission format.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transmission method for cyclically transmitting information from a slave station to a master station by time division multiplexing in a remote monitoring system, and in particular, the word structure thereof. Regarding.

[Conventional technology]

An example of a transmission format in a conventional cyclic information transmission method of this type is shown in FIG.
b) is an example of 62 words in which the number of words exceeds 31 words. In either example, the information to be transmitted is sequentially allocated and transmitted starting from the word address Wl, regardless of its presence or absence.

[Problem that the invention seeks to solve]

In the conventional cyclic information transmission method described above, in the cycle configuration, the word address W is set to Wl.

W2. W3. ..., and one cycle is transmitted up to 63 words regardless of the presence or absence of information, or one cycle is completed and transmitted at the last word address that has information, so Even if the word addresses containing the information to be transmitted are discrete, it is necessary to transmit everything from the word address Wl to the final word address, and the transmission time becomes extremely large compared to the amount of information, resulting in a delay in the data update interval. There were drawbacks.

The present invention has solved these conventional drawbacks, and its purpose is to shorten the data update interval by transmitting only necessary word addresses without transmitting unnecessary word addresses.

[Means for solving problems]

In order to achieve the above object, the present invention provides a
In a cyclic information transmission method in which information is cyclically transmitted to the first station by time division multiplexing, the first station has a table that stores information scheduled to be transmitted in correspondence with word addresses, and When information is generated, only the word address to which the information to be transmitted is added is included in the transmission format and transmitted to the second station.

[Effect]

Since only word addresses with information are transmitted without transmitting word addresses with no information, the data update interval in the cyclic information transmission system can be minimized.

〔Example〕

FIG. 1 shows an example of a transmission format used in one embodiment of the present invention. In the same figure, 5YNC is a synchronization word, W
fal, W (bl, W (cl is information to be transmitted) is a certain word address, and its value is arbitrary.

In this way, in the present invention, only word addresses that need to be transmitted, that is, word addresses that have information to be transmitted, are included in the transmission format, and word addresses that do not have information to be transmitted are not included in the transmission format. This is different from the conventional method.

Figure 2 shows a specific example of the transmission format used in the embodiment of the present invention, and in the table of Figure 3, which stores a total of 62 pieces of information scheduled for transmission in word address correspondence, the circles are This corresponds to the case where only information is transmitted. That is, word address Wl, word address W2. Word address W10. Word address W
24. Word address W40 and word address W6
3 is the only information to be transmitted at the moment, in the embodiment of the present invention, as shown in FIG. 2, synchronization word 5YNC, word address Wl, word address W2. Word address W10. Word address W24. Word address W40. Word address W
A transmission format is generated so that only 63 (however, information to be transmitted is added to each word address) is transmitted within one cycle.

In this case, the data update interval is a transmission speed of 12008 PS.
The time is 0.26 seconds.

On the other hand, in the conventional method shown in FIG.
), and all word addresses (
Word addresses Wl, W2. WIO.

W24. Only W2O and WS2 have information, and no information is added to other word addresses), so the data update interval requires 2.35 seconds at a transmission speed of 12008 PS.

FIG. 4 is a block diagram of main parts of a remote monitoring system implementing the present invention, in which 1 is a master station, 2 is a slave station, 3 is a transmission path connecting the master station 1 and slave station 2, 4(1), 4 (2),...,4(6
3) is a human power section, 5 is a slave station transmitting section, and input section 4 (i
) requests transmission of information corresponding to each word address W1 to W63 shown in FIG. However, word address W3
2 is assigned to the sync word, so 4 (32)
There is no equivalent input section.

Now, at a certain point, the input section 4 (1), the human power section 4 (
2) When a change in the status of the monitored object is detected only by input unit 4 (10), input unit 4 (24), input unit 4 (40), and input unit 4 (63), a request to send information is sent from there. is performed for the slave station transmitter 5. The slave station transmitter 5 is
For example, transmission requests from the input units 4(1) to 4(63) are detected at a predetermined period, and when a transmission request from the input unit is detected, the word address Wl requested for transmission is detected.

W2. WIO, W24. A transmission format as shown in FIG. 2 is generated from W2O, WS2 and the corresponding information in the table in FIG. . Note that the table shown in FIG. 3 is set, for example, on the RAM, and information to be transmitted is set at the time of initial setting and the like.

The master station 1 identifies the word address in the received transmission format as the word address to be updated, and updates the data based on the information added to each word address.

〔Effect of the invention〕

As explained above, since the present invention transmits only word addresses with information without transmitting word addresses without information, it is possible to minimize the data update interval in the cyclic information transmission method. It has the effect of

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of a transmission format according to an embodiment of the present invention, Fig. 2 is a diagram showing a specific example of a transmission format according to an embodiment of the present invention, and Fig. 3 is a diagram showing an example of a transmission format according to an embodiment of the present invention. FIG. 4 is a block diagram showing an example of a system implementing the present invention, and FIG. 5 is a diagram showing an example of a conventional transmission format. In the figure, S Y N C... synchronization word, W+I
11. W(bl, W lcl...any word address, Wl-W63...word address, l...
- Master station, 2...Slave station, 3...Transmission path, 4(1) to 4
(63) is an input section, 5... slave station transmitting section.

Claims (1)

[Claims] In a cyclic information transmission system in which information is cyclically transmitted from a first station to a second station by time division multiplexing, the first station transmits information scheduled to be transmitted to a word address. When information to be transmitted is generated, only the word address to which the information to be transmitted is added is included in the transmission format and transmitted to the second station. Characteristic cyclic information transmission method.