DE2844453A1 - Transmission system for remote-control signal-packets - reduces cycle times by having substations distribute transmissions over several interrogations - Google Patents

Abstract

The transmission system has all substations interrogated by a central station simultaneously during breaks between current measurement data interrogation to see whether they are ready to send spontaneous information. Only those substations with spontaneous information notify the central station that they want to send via a shared monitoring channel. The central station then interrogates these substations sequentially. The substations with spontaneous data to send notify the central station immediately after interrogation. When spontaneous data is present simultaneously at different substations distribute their spontaneous data arbitrarily amongst several interrogations.

Description

Method for the transmission of telecontrol telegrams in

Public transport The invention relates to a method for the transmission of telecontrol telegrnms in joint traffic, in the case of one Central in a pause between the ongoing measurement data request all substations can be queried for spontaneous information at the same time, and only the substations spontaneous information is sent to the Report back to the control center and then be specifically queried by the control center.

The telegram traffic in telecontrol systems in joint traffic must be organized in such a way that spontaneous data from the substations is optimally timed and as possible can be recorded by the control center without overlapping. at one simultaneous Data queries to all substations for spontaneous reports result in response telegrams from all substations that are queued at the same time and are in the common monitoring channel can overlay.

In known methods, the response reaction of the substations organized in such a way that any spontaneous report that may arise is only available in one for the substation reserved period of time can be sent. Since the accumulated information can only be transmitted serially, this is Procedure associated with considerable expenditure of time.

Because despite a small amount of spontaneous information the transmission line blocked for the entire interrogation of all substations.

There are various suggestions for avoiding such large interrogation cycles been made.

So it is known (P 28 30 142.0), in the presence of spontaneous Information in one of the substations by means of a logic built in there Interrupt monitoring channel so that everyone behind this substation with spontaneous Information arranged substations are switched off by the control center. Through this there is already a considerable reduction in the cycle time.

Also known (P 28 30 097.2) is a method in which all substations when inquiring about spontaneous information one after the other the transmission level for a short time is switched on and off and only the substations with spontaneous Information does not respond to this call. There are thereby impulses instead Telegrams used in the transmission, which means a significant simplification.

In another procedure (P 28 28 733) the substations report with spontaneous information within certain time periods corresponding to a Code with identical reply telegrams, whereby the length of a reply telegram corresponds to a time segment and each substation is assigned its own code word is. This also makes it possible to achieve a reduction in the cycle times, so that the constantly accumulating process data are not interrupted for an unnecessarily long time.

It is therefore an object of the invention, especially if less occurs spontaneous information to achieve a further reduction in the cycle time. Telecontrol processes with a low frequency of spontaneous data and a large number of substations can thus be optimized significantly.

According to the invention this is achieved in that the substations report with spontaneous data immediately after the query from the control center, and that with the simultaneous occurrence of spontaneous data in different substations in the case of the same query, the substations send their spontaneous data after a random decision Distribute freely selectable over several queries.

The fast one is advantageous according to the method according to the invention Transmission of the spontaneous information that has arisen to the control center. Through this Time savings, more substations can be included in the query cycle, i.e. more measurement data can be transmitted.

An embodiment of the method according to the invention is shown below explained in more detail with reference to the drawing.

For telecontrol processes in which messages, measured values, counter values are continuous are transmitted from the substations to a control center, fall sporadically spontaneous Information that needs to be transmitted quickly and results in an interruption general data transfer.

The query of all substations for measurement data takes place after a General interrogation cycle. After a certain time, when the query of all substations is finished, the query begins again at the first substation. Between the Interrogation of the individual substations are built-in sub-cycles in which a call to all substations based on spontaneous information.

In the general interrogation cycle according to the drawing begins at the point in time t1 the query of the measured values of the substation US1. At time t2 (start of the sub-cycle) the call is made to all substations after spontaneous data. Since no data is available (normal case), this call is ended and at time t3 (end of the sub-cycle) the substation US2 queried. After querying this US2, at time t4 (sub-cycle) Another call to all substations for spontaneous data is sent. This time spontaneous information is available, and in a further targeted query the substation is addressed with the spontaneous information. After submitting this Information, the measurement data query of the US3 is carried out at time t5. To the time t6 there is another query (sub-cycle from t6 to t7) with a call to all Substations. This 7 times spontaneous data has accrued in two substations, for example in the substations US21 and US38 shown in nSht. In each However, only spontaneous information can be queried in the sub-cycle.

The frequent occurrence of spontaneous information rarely occurs in practice before, but is provided here to illustrate the method according to the invention.

In the case of a specific query in sub-cycle t6 to t .7, both spontaneous information when transmitted to the control center due to their Delete or falsify bit pattern structure. According to the invention is therefore a Relocation or distribution of the spontaneous information that has arisen to others Query cycles made. This is done by a random number generator in each Substation in the form of, for example, a 7-meter reading is available and for many Tasks can be used. This random number generator now sets a sequence of simultaneously pending spontaneous information from US21 and US38. So that gets for example US38 assignment I and US21 assignment II.

At the time t7, the measured data transmission of the substation US4 starts a. At time t8, after a call to all, the transmission of the spontaneous Information from US38 with assignment I that occurred in sub-cycle t6 to t7 was. After the US5 has been polled for measurement data, the call takes place at time t10 to all the transfer of the spontaneous information from the US21 (from the sub-cycle t to t7) with the assignment II. This transfer is ended at time t11.

Prerequisite for the distribution of spontaneous information to others Query sub-cycles is of course that in this cycle there is no additional one spontaneous information has arisen. If this were the case, a random generator an order for the later distribution is again established.

If three spontaneous pieces of information occur at the same time, is also Distribution to further query cycles is still possible.

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Claims (1)

A n ~ s ~ p r u c h Procedure for the transmission of remote control telegrams in multi-point traffic, in which from a control center in a break between the ongoing measurement data request from all substations simultaneously for spontaneous information Only substations with spontaneous information are queried Report back to the control center via a common monitoring channel and then are specifically queried by the center, characterized in that the Substations with spontaneous data immediately after the query from the control center report and that with the simultaneous occurrence of spontaneous dates in different Substations (21, 28) with the same query (t6 to t7) the substations their spontaneous data after a random decision freely selectable on several queries (t8 to t9 or t10 to t11).