JPS5851639A - Word scanner system - Google Patents

Abstract

PURPOSE:To cope with frequent extension of individual input sections without decreasing the transmission efficiency of a communication line, by providing a means omitting the transmission of data to the individual input section not returning a signal representing actual devices. CONSTITUTION:An individual input section 1-X and a word scanner 2'' are connected with a control signal bus 6 other than an address bus 4. When an address ADX is outputted, and when the individual input section 1-X assigned with the address ADX is mounted, a decoder 11 discriminates the address ADX transmitted from the bus 4 and outputs ''1'' and makes a gate 12 conductive. On the other hand, when the input section 1-X is not mounted, even if the address ADX is outputted from the scanner 2'' to the bus 4, no control signal CS is outputted to the bus 6. As a result, a gate 24 of the scanner 2'' is conductive, a clock signal CL immediately advances a step counter 21 by one step via gates 24 and 23 and outputs the next address.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a word scanner type, and more particularly to a word scanner type in a cyclic data transmission system comprising a word scanner scanning a plurality of individual input sections.

For example, in a power dispatch center or the like that manages a power supply system including a large number of power plants, substations, etc., it is essential to constantly know the operating status of each power plant and f-power outages. In this case, a cyclic data transmission method is widely applied as a means for transmitting various data indicating the operating status from each power plant or substation to the power dispatch center.

FIG. 1 is a diagram showing an example of a system of a cyclic data transmission system to which the present invention is applied. In FIG. 1, a transmitting device 10 installed in a power plant, for example, includes a plurality of individual input units 1
-1 to 1-N1 word scanner 2 and transmission section 3. Each individual input section 1-1 to 1-N inputs each data such as power and voltage into a predetermined digital code (hereinafter referred to as word W).

to WN (T). The word scanner 2 sequentially scans all the individual input sections 1-1 to 1-N at a predetermined period T, and sequentially sends the corresponding words WI to WM to the transmission section 3.
to communicate. The transmitter 3 receives each word W1 to WN.
After converting the signal from a parallel code to a serial code, the signal is sent to the transmission line 30 with the necessary courage added.

FIG. 2 is a T diagram showing an example of a conventional word scanner of one type. In FIG. 2, a step counter 21 counts step signals 8U input at fixed intervals (hereinafter referred to as edge scanning interval t), and outputs each count from addresses AD to AD,
The respective individual inputs 51-1 to 1-N1 are transmitted via the address bus 4 as follows. Each individual input section 1-X (X is 1 to N) receives an address AD from the address bus 4,0);
to AD.

transmits the held word Wx to the transmission unit 3 via the data bus 5 at a scanning interval t that coincides with the address ADx assigned to itself. When the step counter 21 finishes outputting the final address AD, a reset signal) t8
is input and reset, and the number of stitches is output again sequentially from the first address AD1. As is clear from the above explanation, the conventional one-way word processing system outputs the address at a constant scanning interval. AD, to AD
The addresses are sequentially sent to the address bus 4.

However, it is rare that all of the individual input units 1-1 to 1-N are installed from the beginning, and they are often added sequentially as power plant equipment is expanded, for example. In Figure 2, if the individual input units 1-J and 1-K are not implemented, the conventional word scanner 2 will also have the unimplemented individual input units 1. Address AD assigned to -J and 1-K.

and ADK respectively to the destination address No. 1-J and 1-K.
Since the words W□ and W engineering corresponding to are not output,
When the transmission unit 3 receives the word string (which is received from the data/(s) 5 at the scanning period T), an idle interval as shown in FIG. In order to eliminate the drawbacks of conventional word scanners,
One type of word scanner as shown in FIG. 4 has already been tried. The word scanner 2' shown in FIG.
Accordingly, the installed individual input section 1 1-1 to 1-(J-1
) and 1-(K+1, ) to 1-N, and are converted into addresses AD, to AD□-8, and ADK+, to ADH, and then transmitted to the address bus 4. As a result, address /
L is not transmitted, and therefore, the word string transmitted to the transmission unit 3 via the data bus 5 does not include any idle intervals as shown in FIG. 5, and the scanning period T' is also shortened, and the communication The transmission efficiency of the line 30 is also improved. However, as the number of individual input units increases, the address conversion function of the memory 22 dedicated to cutting must also be changed.

The address conversion function of the memory 22 dedicated to al12 stacking is set by a program, but it is extremely difficult to change the program by anyone other than the manufacturer, so the period for changing the bales is long (and the individual input section is not required). It is unsuitable if the number of units is frequently increased.

The purpose of the present invention is to eliminate the drawbacks of the conventional one-way communication system as described above, and to avoid reducing the transmission efficiency of the communication channel.
Moreover, it is possible to realize a one-type word scanner that can cope with the frequent addition of individual input units.

This purpose is achieved in a cyclic data transmission system equipped with a word scanner that scans a plurality of individual input sections.
A means is provided for returning a signal indicating implementation when scanned by a word scanner that scans the individual input section, and transmitting data to the individual input section that does not return a signal indicating the actual device to the word scanner. This is achieved by providing means for omitting the following. An embodiment of the present invention will be described below with reference to FIGS. 6 and 7. FIG. 6 is a diagram showing the configuration of a transmitter to which a word scanner type is applied according to an embodiment of the present invention, and FIG. 7 is a diagram showing a one-type word scanner type according to an embodiment of the present invention. . In addition, throughout the figures, the same reference numerals indicate the same objects.In the T0 6th tuna, individual input units 1-1' to 1-N
' and word scanner 2# are connected not only by address bus 4 but also by control signal path 6. The control signal bus 6 receives a signal (hereinafter a control Signal 08 (T) is word scanner 21
This is used to return the item to the customer. As shown in FIG. 7, each individual input section 1-1 to 1-N1 is provided with a gate 12 and a transistor 13 for outputting a control signal O8. Further, as shown in FIG. 7, the word scanner 2' has a gate 23 which inputs a clock signal OL controlled by a control signal C8i received from a control signal bus 6 to a step counter 21 in addition to a step signal SU4ζ. 24 is provided, and the memory 22 dedicated to balance collection as shown in FIG. 4 is not used. In FIG. 7, the step counter 21 of the word scanner 2' counts the step signal SU inputted through the gate 23 at the normal scanning interval t, and outputs addresses ADI to ADN to the Kenpo address bus 44. When the address ADK is output now, the individual input section 1- to which the address ADx is assigned
If X is implemented, the decoder 11 uses the address bus 4
It identifies the address ADx transmitted from the transistor 1 and outputs the logic value 1, and makes the gate 12 conductive.As a result, the voltage V is applied to the transistor 1 through the gate 12, which has become conductive.
3 is activated, and the control signal 08 with the embedded value 0 is sent to the control signal bus 6.
Output to . The control signal O8 is transmitted to the word scanner 2' via the control signal bus 6 and places the gate 24 in a blocked state. As a result, the clock OL is not input to the step counter 21, and the words that keep the predetermined scanning interval within the individual input section 1-X are transmitted to the transmission section 3 via the data bus 5.

On the other hand, if the individual input section 1-X is not installed, even if the address ADtψS is output from the word scanner 2' to the address node 4, the control signal O8 will not be output to the control signal bus 6. None. As a result, the gate 24 of the word scanner 2' becomes conductive, and the clock signal OL immediately increments the step counter 21 by one step via the gates 24 and 23 to output the next address ADx+1.

As a result of this aS, scanning proceeds without using the predetermined scanning interval t for individual input units that are not mounted on the word scanner 2'. When the step counter 21 finishes outputting the final address AD, it is reset by a reset signal R8,
Repeat T to output sequentially from the first address AD again.

As is clear from the above description, according to the first embodiment, the word scanner 2' scans unmounted individual input sections without spending the predetermined scanning interval t, so the data bus 5 is The word string transmitted to the transmission unit 3 via
The state is approximately as shown in FIG. 5, which does not include the large free-width spacing. Therefore, even if, for example, the transmission unit code data increases at the power dispatch center etc. due to the expansion of power plant equipment, all you need to do is add the corresponding individual input unit 1-X, and the translation will be sent to Word Scanner 2#. There is no need for complex modification work such as changing the program cost of a dedicated memory.

Note that FIGS. 6 & IJ and FIG. 7 are only one embodiment of the present invention, and for example, the control signal 08 output means of the individual input section l-X and the scanning advance means of the word scanner 2' are as shown in the figures. There are no limitations and many other modifications may be considered, but the effects of the present invention remain the same in either case. It goes without saying that the object of the present invention is not limited to the Boolean transmission system between power plants, IGC, and power plants.

As described above, according to the present invention, in the cyclic data transmission method, a single word scanner type is realized which does not reduce the transmission efficiency of the communication path and can sufficiently respond quickly to the frequent addition of individual input units. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a system of a cyclic data transmission system to which the present invention is applied, FIG. 2 is a diagram showing an example of a conventional word scanner type, and FIG. 3 is an example of the word string in FIG. 2. FIG. 4 is a diagram showing another example of the conventional one-sided word scanner. FIG. 5 is a diagram showing an example of the word string in FIG. 4. FIG. 6 is an embodiment of the present invention. FIG. 7 is a diagram showing the configuration of a transmitting device to which a single word scanner type is applied, and FIG. 7 is a diagram showing a single word scanner type according to an embodiment of the present invention. In the figure, 10 is a transmitting device, 20 is a receiving device, 30 is a communication path, 1-1 to 1-N, 1-1' to 1-N',
1-(J-1)% l-J, 1-to, 1-(K+1
) and i-x are individual input sections, 2.2' and 2# are word scanners, 3 is a transmission section, 4 is an address bus, 5 is a data bus, 6 is a control signal path, 11 is a decoder, 12
．． 23 and 24 are gates, 13 is a transistor, 21
is a step counter, 22 is a memory dedicated to pattern capture, SU is a step signal, AD, 0, ADK+1 and ADx are at'su Wl to wN, w, l, W
, , W, , WK ten. and Wx is word, T and T' are scanning period, tt is scanning interval, R8 is reset signal, O8 is control signal, OL
The beam indicates a p-took signal. Houki 1 diagram 2- diagram? wo back spear 4 hard fb diagram 7 figure

Claims (1)

[Claims] In a cyclic data transmission method comprising a word scanner that scans individual input sections of a decimal number, the individual input section is provided with means for returning a signal indicating implementation when scanned by the word scanner; A word scanner of one type, characterized in that the scanner is provided with means for omitting data transmission to the individual input section that does not return a signal indicating the implementation.