JPS61275903A - Dual system - Google Patents

Abstract

PURPOSE:To attain dual systems easily and inexpensively without adding special data neither transmission lines by providing optical fibers and a spectroscope and using the reflection of light to transmit information required for duplexing. CONSTITUTION:Masters 1 and 2 of the current system and the stand-by system and slaves 41-4n are connected mutually by optical fibers 6 repeating a spectroscope 5. When the master 1 of the current system transmits optical data to saves 41-4n, optical data is transmitted to slaves 41-4n through the spectroscope 5, and a part of this data is reflected on the spectroscope 5 and is transmitted the master 2 of the stand-by system also. If optical connectors 3 are used to connect optical fibers 6 to the spectroscope 5, an air layer is slightly formed normally, and the reflection occurs on the end face of the spectroscope by the difference of refractive index between this air layer and glass. Thus, the stand-by system can intercept what the master 1 of the current system requests to slaves 41-4n.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a duplex system using optical transmission technology.

[Conventional technology]

FIG. 3 is a schematic diagram showing a conventional example of a duplex system.

In the figure, 1 is a regular system mask (control device; controller), 2 is a backup system mask, 41 to 4n are slaves (controlled devices), 71 and 72 are electrical signal transmission lines, and 73 is a duplex transmission line. It is.

In other words, the regular master 1. The standby master 2 is connected to each of the slaves 41 to 4n via electrical signal transmission lines 71 and 72, and transmits information using electrical signals. Therefore, normally the regular master 1 controls the slaves 41 to 4n via the transmission line 71t, but if the regular master 1 fails, the backup master 2 takes over this function and controls the transmission line 2. Each slave 41 to 4n is controlled through the slave terminal 41 to 4n. Note that 73 is a duplex transmission line for sending required data from the regular master 1 to the standby master 2 or vice versa.

[Problem that the invention seeks to solve]

In a redundant system such as the one described above, the backup mask is required to always hold the same data as the data in the regular mask in case the regular mask goes down. In order to perform this equalization, it is necessary to have the following functions.

b) Knowing the response from the slave 0 Mouth) Knowing what the response from the slave means.

C) Knowing the commands given by the regular mask to the slave.

2) Commands from the regular system master are given directly to the standby system mask.

The function of b) 1 mouth) is also provided in conventional models.

Regarding c), it can be solved by adding data indicating what the regular mask requests from the slave to the response from the slave, but adding this data will occupy the transmission line extra. It ends up. This is the first problem with the prior art.

Regarding 2), in order to perform equalization using the backup system mask, it is not enough to just know the response from the slave, but the data held by the regular system master is required. A duplication transmission line 73 must be specially provided.

This is the second problem with the prior art.

Therefore, it is an object of the present invention to easily and inexpensively realize a duplex system without adding special data or transmission lines.

[Means for solving problems]

Optical fibers and spectrometers are installed, and the information necessary for duplication is transmitted using light reflection.

[Effect]

fllfffl is the main diagram that best represents the features of this invention.

That is, the regular master 1, the standby master 2, and the slaves 41 to 4n are connected to each other by an optical fiber 6 relaying a spectrometer 5 to perform optical transmission.
, By doing this, the regular master l becomes the slave 41
When transmitting optical data to ~4n, this optical data is transmitted to the slaves 41 to 4n via the spectrometer 5, and a portion is reflected by the IC and spectrometer 5 and is also transmitted to the standby master 2. . That is, when the optical fiber 6 is connected to the spectrometer 5 using the optical connector 3, a layer of air is usually formed, albeit a small one, and reflection occurs at the end face of the spectrometer due to the difference in refractive index between this air layer and the glass. Therefore, we are trying to take advantage of this phenomenon. This results in
What the regular system master 1 requests from the slaves 41 to 42 can be intercepted on the standby side, and therefore what the regular system mask requests from the slave side can be detected in the response from the slave side. This eliminates the need to add the data that indicates the data, which solves the first problem pointed out earlier.Also, when the regular system wants to pass data to the backup system,
This can be done by utilizing this reflection.

At this time, this data is also given to the slave side, but by setting a flag in the data to indicate that it is data for the backup system, this data can be ignored on the slave side, as mentioned above. The second problem is also solved.

〔Example〕

FIG. 2 is a block diagram showing an embodiment of the present invention.

This is the same as FIG. 1 except that the configurations of the regular system, standby system masks, and slaves are specifically shown. That is, the regular system mask (protection system mask) includes the processing unit 11 (21) that performs predetermined data processing, the E10 converter 12 (22) that converts the electrical signal E into the optical signal 0, and the 0/10 converter that performs the opposite operation. E converter 13 (23) and spectrometer 51 (52)
The slaves 41 to 4n are spectrometers, E
It is composed of 10 converters, an O/B converter, etc., and data transmission as explained in FIG. 1 is performed.

Note that although two spare masters are provided in this case (see reference numeral 2.2), this is not an essential difference. By doing this, it becomes possible to check 2 out of 3 (2 out of 3), and it becomes possible to further improve reliability.

〔Effect of the invention〕

According to this invention, when transmitting data for duplexing, there is no need for special data or a transmission line for connecting between the regular mask and the backup mask, so a simple and inexpensive configuration is possible. This provides the advantage that weighting is achieved.

[Brief explanation of drawings]

Figure 1 is the main diagram that best represents the features of this invention;
The figure is a block diagram showing an embodiment of the present invention, and Figure 3 is a schematic diagram showing a conventional example of a duplex system. Code explanation 1... Regular system mask (control device), 2, 2 ・
...Spare master, 3...Optical connector,
41-4n...Slave (controlled device), 5,
51-54°°゛・°. Spectrometer, 6... Optical fiber, 11, 21...
...Processing unit, 12, 22, 42, 44... Electric/optical (Elo) converter, 13, 23, 43.45...
...Optical/electrical (07E) converter, 71, 72...
...Electrical signal transmission line, 73...Duplication transmission line

Claims (1)

[Claims] In a redundant system comprising a regular control device that controls a plurality of controlled devices and a backup control device that backs up the regular control device in the event of an abnormality, the regular and backup control device and the plurality of controlled devices A spectrometer is connected between the two via an optical fiber that relays the spectrometer, and the backup control device receives data and commands output from the regular control device by utilizing the reflection of light in the spectrometer. Duplicate system.