JPS5823790B2 - Synchronous cooperation method of duplex cyclic data transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a duplex cyclic data transmission device, and more particularly to a duplex cyclic data transmission device configured so that a main cyclic data transmission device and a slave cyclic data transmission device can transmit signals synchronously. This invention relates to a synchronous cooperation method for a cyclic data transmission device.

A cyclic data transmission device is 1. For example, various types of detectors are installed in each equipment or premises of a power plant, and the data obtained from these detectors is sent to a monitoring station that monitors the operating status of the power plant. It is used for data transmission.

In this cyclic data transmission device, for example, 6 bits are used to create an address for selecting the detection section, and first, for example, a synchronization signal for synchronizing with the receiving device is transmitted.

The first word is the generated voltage, and the second word is the generated current.

Think of it as transmitting data of predetermined items, for example, 63 items of data, from a power plant or substation to a monitoring station in a certain order, such as the third word, volt-ampere generated, etc. It's fine.

At this time, each data obtained from each of the above-mentioned detectors is constantly cyclically transmitted.

Recently, system safety has become even more important, and the cyclic data transmission equipment described above has been duplicated, and a second
As shown in the figure, a duplex cyclic data transmission system is used.

That is, input section 1. Parallel bit/serial bit converter 2. A system consisting of a scanner 3, a modulation section 4, etc., and a B system consisting of an input section 1', a parallel bit/serial bit conversion section 2', a scanner 3', a modulation section 4', etc.
Two cyclic data transmission devices are used in the system, and the same output signal from the sensor S is transmitted to each input section 1 and 1'.

Note that in FIG. 2, only one each of the input section 1°1' and the sensor S are shown.

In actuality, for example, 62 input sections are provided, and each input section sequentially sends out its data based on the address signal sent from the scanner 3゜3', which is converted into serial bits by the parallel bit/serial bit converters 2 and 2'. After the signal is converted into a signal, the signal is converted by the modulators 4 and 4' and transmitted.

In this way, the cyclic data as shown in FIG. 1 is configured to be outputted to the monitoring station from the A system and the B system in duplicate.

However, in the conventional dual identical data transmission system shown in FIG. 2, the A system and the B system each operate independently.

As a result, the start of scanning for scanners 3 and 3' is determined when the power is turned on for each of the scanners 3 and 3'.
It was very difficult to obtain synchronized address signals from /.

For this reason, when the 30th word item is sent from the A system, the 10th word item is sent from the B system, resulting in an asynchronous state.

Therefore, when system A, which is the main cyclic data transmission device, malfunctions and is switched to system B, which is the subordinate cyclic data transmission device, data continuity cannot be obtained at the receiving end, and some data is interrupted. Or conversely, some data may be duplicated, causing problems in ensuring system security.

Therefore, an object of the present invention is to provide a synchronous cooperation method for a duplex cyclic data transmission device that improves the above problems, and for this purpose, the synchronous cooperation method for a duplex cyclic data transmission device of the present invention , comprising an input section into which data transmitted from the plurality of detection means is input, selection means for selecting the data transmitted from the plurality of detection means in a fixed order, and transmission means for transmitting the input data; A duplex cyclic data transmission device comprising at least two cyclic data transmission means configured to sequentially transmit data sent from a detection means in a fixed order.

Each of the above-mentioned cyclic data transmission means includes a rank detection means for detecting the transmission word rank, a redundant bit creation means for adding a redundant bit after a specific rank word, and a redundant bit creation means for adding a redundant bit after a specific rank word, and a means for detecting a transmission word rank according to the redundant bit. The present invention is characterized in that the cyclic data transmission signals are transmitted in synchronization with each other by providing synchronization pull-in means for performing data transmission synchronously.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

FIG. 3 shows a circuit configuration of an embodiment of the present invention, and FIGS. 4 and 5 are diagrams explaining its operating state.

In the figure, 1o-i to 10-N and 10-1' to 10-
N' is the input section, 11.11' is the parallel bit/serial bit converter, 12°12' is the scanner, and 1
3.13' is a modulation section, 14°14' is an OR circuit, 15.
15' is a synchronous control circuit.

16 is a final word detection circuit, 17 is a redundant bit creation circuit, and 18 is a synchronization pull-in circuit.

Data detected by mutually different sensors S-1 to SN is transmitted to the input units 10-1 to 10-N, respectively.

The scanner 12 operates to send out the signals transmitted to the input sections 10-1 to 10-N based on the address signals generated by the scanner 12.

The synchronization control circuit 15 includes a final word detection circuit 16. It is equipped with a redundant bit creation circuit 17 and a synchronization pull-in circuit 18.

Further, the input sections 10-1' to 10-N', the scanner 12', and the synchronization control circuit 15' are connected to the input section 10-1.
to 10-N, scanner 12. It is configured similarly to the synchronous control circuit 15 and the like.

And the A-system cyclic data transmission device.

The input sections 10-1 to 10-N, the parallel bit/serial bit conversion section 11, the scanner 12° modulation section 13,
The B-system cyclic data transmission device, which is composed of an OR circuit 14 and a synchronization control circuit 15, has input sections 10-1' to 10-N', parallel bits and serial bits, similar to the A-system device. Conversion unit 11', scanner 12
', modulation section 13', OR circuit 14', and synchronous control circuit 1
5'.

The output of the sensor S-1 is simultaneously transmitted to the input section 10-1 of the A system and the input section 10-1' of the B system, and the output of the sensor S-N is transmitted to the input section 10-N of the A system and the input section 10-1' of the B system. System input section 10-
N' is simultaneously transmitted.

Of course, outputs from other sensors (not shown) are similarly transmitted to the A-system input section and the B-system input section.

Now, the input section 10 is input from each of the sensors S-1 to S-N.
-1 to 10-N are the data transmitted.

The data is binary encoded and transmitted to the parallel bit/serial bit converter 11 according to addresses sequentially generated by the scanner 12.

The parallel binary data sent from each input section 10-1 to 10-N is converted into serial bits, and the data is displayed as one word for each sensor as shown in FIG. The signal is then sent to the external C.

For example, the data at the input section 10-1 is sent out as the first word, and the data at the input section 10-N is outputted as the 63rd word.

When the scanner 12 generates an address that produces the output of the 63rd word, it reports this stiffness to the final word detection circuit 16.

Since each word consists of 44 bits, the final word also consists of 44 bits, as shown in FIG.

Therefore, when the last word detection circuit 16 receives a report from the scanner 12 that the final word address signal has been generated, the final word detection circuit 16 generates a redundant bit creation instruction signal to the redundant bit creation circuit 17.

As a result, redundant bits are created, and the redundant bit creation circuit 17 transmits a control signal to the synchronization pull-in circuit 18 to perform synchronization pull-in as described later to the B-system cyclic data transmission device.

While synchronizing, the scanner 12 is turned off while the redundant bit is occurring.

As detailed in FIG. 5, the redundant bit is generated one bit after the 44th bit of the final word.

This redundant bit is transmitted to the modulation section 13 via the OR circuit 14.

As shown in FIGS. 4 and 5, if data transmission is performed in the A system later than in the B system, redundant bits are inserted first in the B system.

In this case, the B system starts sending the synchronization word first, but due to the redundant bit in the A system, the redundant bit continues to occur even after one normal cycle, and is reset to the B system's synchronization word, and the A system When redundant bits disappear,
Control is performed so that the synchronization word is generated again not only in the A system but also in the B system.

Both systems will thus transmit the first word in synchronization.

Also, contrary to Figures 4 and 5, if system A is transmitting data more advanced than system B, the redundant bits of system B disappear before the redundant bits of system A disappear. However, in the B system, a synchronization word is generated in the same manner as in the A system, and both systems send out the first word in synchronization.

In any case, when the redundant bit of system A disappears, 1. Even if system B is still in the middle of data transmission, it is configured so that a synchronization word is generated in synchronization with system A, so for some reason Therefore, even if the synchronization of both systems is largely out of sync, both systems can be synchronized at the time a synchronization word is generated in system A.

In the above explanation, the case where the A system is the main system and the B system is the slave system has been explained, but of course, even when the B system is the main system and the A system is the slave system, synchronization can be achieved in the same way.

As explained above, according to the present invention, when data is transmitted using a plurality of cyclic data transmission devices, one
The redundant bits make it extremely easy to synchronize between each transmission device, so even if one transmission device fails, the received data will not be partially duplicated or partially cut off. It becomes possible to transmit data continuously without any interruptions.

Therefore, it is possible to provide a dual electronic data transmission system with extremely high monitoring capability.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a conventional duplex cyclic data transmission system, FIG. 3 shows the structure of an embodiment of the duplex cyclic data transmission device of the present invention, and FIGS. Fifth
The figure is an explanatory diagram of its operating state. In the figure, 1 and 1' are input sections, 2 and 2' are parallel bit/serial bit conversion sections, 3 and 3' are scanners, and 4
and 4' are modulation sections, 10-1 to 10-N and 10-1
' to 10-N' are input parts, 11 and 11' are parallel bit/serial bit conversion parts, 12 and 12
' is a scanner, 13 and 13' are modulators, 14 and 14
' is an OR circuit, 15 and 15' are synchronous control circuits, 16 is a final word detection circuit, and 11 is a redundant bit creation circuit. Reference numeral 18 indicates a synchronous pull-in circuit, and S-1 to S-N each indicate a sensor.

Claims (1)

[Claims] 1 comprising an input section into which data transmitted from the plurality of detection means is input, selection means for selecting the data transmitted from the plurality of detection means in a fixed order, and transmission means for transmitting the input data; In a duplex cyclic data transmission device in which cyclic data transmission means are duplicated so as to sequentially transmit data sent out from a detection means in a fixed order, a transmission word order is assigned to each of the cyclic data transmission means. A ranking detecting means for detecting, a redundant bit creating means for adding a redundant bit after a specific ranking word, and a synchronization pull-in for performing data transmission synchronously with other cyclic data transmission means according to the redundant bit. A synchronous cooperation system for a duplex cyclic data transmission device, characterized in that the cyclic data transmission signals are transmitted in synchronization with each other by providing means.