JPS598452A - Data transmitter - Google Patents

Abstract

PURPOSE:To attain the disconnection of a station and a transmission cable in a high speed, by constituting so that the connection of a 2:2 bypass switch is switched with a control signal from a data transmitting control station when a failure is detected. CONSTITUTION:Terminals 13 and 16, 14 and 17 of the 2:2 bypass switch 11 are connected electrically in normal state. Thus, a transmission signal is supplied to a transmission line input/output terminal 10 of the station 9 through a main cable 18 via the terminals 16, 13 and a branch transmission cable 15, and the transmission signal is supplied received at the terminal 10 and then, transmitted to the cable 18 through the input/output terminal 10, the cable 15 and the terminals 14, 17. When a failure is detected at a self-failure detecting function in the station 9, a switching command is inputted from the station 9 to the switch 11 to connect electrically the terminals 16 and 17, 13 and 14 of the switch 11. Thus, the transmission signal through the cable 18 is transmitted to the cable 18 through the terminals 16, 17 and the transmission preventing the failed station 9 is continued.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a data transmission device for ferrous, non-ferrous,
Facilities and equipment in the water supply and sewage, paper manufacturing, and food industries are generally controlled by control systems centered on control computers. If there are many control points scattered within the equipment, or if it is necessary to link various controllers, these control points and auxiliary devices should be connected to each other mechanically. A data transmission device capable of this is often used. Such a data transmission device is particularly called a data transmission device for process control.

FIG. 1 is a schematic diagram showing an example of a conventional process control data transmission device of this kind, and 1 is a system computer (company) computer (
CPV''), 2 is the process controller (PC), 3 is the process input/output device (I1084 is the transmission control station (8TN
, hereinafter referred to as station). These are connected by a transmission cable 5 as described below. That is, station 4a to which the regulatory computer is connected
Station 4 to which process controller 2a is connected
b is connected to the transmission cable 5a. In addition, this station 4b and the process input/output device 311
The connected station 4C is the transmission cable 5
connected by b. Furthermore, this station 4
C,! :, the station 4d to which the process input/output device 3b is connected is connected by a transmission cable 6C. This station 4d' and the station 4e to which the process input/output device 3c is connected are as follows.
They are connected by a transmission cable 5d. Further, this station 4e and a station 4f to which the process controller 2b is connected are connected by a transmission cable 5e. Also, this station 4f and MiJ
It is connected to the station 4m by a transmission cable 5f, forming a loop transmission path.

In addition, a pinoswitch 6 is connected in parallel to each station 4 except the station 4a to which the sharpening meter nose machine 1 is connected, and the pinoswitch 6 and the station 4a are connected by a direct cable 7. has been done.

The station 4a represents the overall control of the collateral for directly looping the receiving side of each station 4 to the transmitting side. Arrows shown on the transmission cable 5 indicate the direction of signal transmission, and data transmission between the stations 4 is realized by the signal circulating in a fixed direction on a loop.

Generally, in such a loop-shaped process-controlled data transmission device, if one or more stations 4 fail, there is a function that allows the remaining normal stations 4 to continue the transmission operation. The pin 9 switch 6 described in No. 111 is used to prevent the loop structure of the transmission line from being cut off by a failed station 4. For example, as shown in FIG. 1, the K4/4' switch 6d is in an inactive state due to a command from the station 4a because the station 4e has failed.

The data transmission device g, which bypasses the failed station 4 by means of the direct connection cable 7 directly connected to the station 4a serving as the control station, as described above, has the following drawbacks.

Pull costs and construction costs will increase. Furthermore, in order to find the malfunctioning station 4, each station 4 must be pyromassed one by one starting from the central station 4a to determine the abnormal vertebrae, which takes a long time to recover and data is lost. Continuity of transmission is sometimes not considered in terms of maintenance.

On the other hand, there is another example of such a data transmission device for process excavation as shown in FIG. The station 4b is connected to the station 4b by a cable 6.7, that is, a main transmission cable 6m and a subtransmission cable 7a, and the process controller 2a is connected to the station 4b. Further, the station 4C to which the process input/output device f3a is connected and the station 4h are connected by a main transmission cable 6 and a sub transmission cable 7b. Furthermore, the station 4d to which the process input/output device 3b is connected and the station 4C are connected by a main transmission cable 6C and a sub-transmission cable 7C. Further, the station 4e to which the process input/output device Jc is connected and the station 4d are connected by a main transmission cable 6d and a sub-transmission cable 7d. ,
Station 4f, to which the process controller 2b is connected to the fourth station, and station 4e are connected by a main transmission cable 6e and a sub-transmission cable 7e.

Further, the station 4f and the station 48 are connected by a main transmission cable 6f and a sub-transmission cable 7f, and these constitute a loop transmission line. In addition, the main transmission cable 6 mentioned in @iJ circulates the transmission signal in the same direction when there is no abnormality in each device of the transmission pupil, and connects the transmission signal between each stage 4 as in the example shown in Fig. 1 above. Realize data transmission. On the other hand, the sub-transmission cable 7 is not used for ie during normal operation, but when a failure occurs in the station 4 or the main transmission cable 6, it is conveniently used for tickets when a reverse transmission path is constructed by bypassing the failure location.

In the process separation data transmission device shown in FIG. 2, when a failure occurs in the station 4 or the main transmission cable 6, a transfer direction switching command is transmitted from the central station 4a through the main transmission cables or the sub transmission cable L. The transmission direction is switched between two stations adjacent to the faulty location, so that the transmission signal is transmitted to all remaining normal stations 4, avoiding the faulty location.

For example, if a failure occurs at station 4e shown in FIG. It is transmitted to one station 4b adjacent to 4B,
If no failure is detected here, then the main transmission cable 6b
, or station 4C via sub-transmission cable 7b.
A failure detection command is input to

If no fault is detected, the main transmission cable 7c.

Alternatively, the station 4d can be connected to the station 4d via the sub-transmission cable 7d.
A failure detection command is input to the station 4, and if no failure is detected, the failure detection command is input to the station 4 via the main transmission cable d or the sub transmission cable 7d. If a failure is detected here, a transmission direction switching command is input to the station 4d adjacent to this station 4e, and the transmission direction is switched here to prevent the failure of the station 4C.
The transmission signal is transmitted while avoiding this. On the other hand, the failure detection signal is also transmitted to the other station 4c adjacent to the center station 4a via the main transmission cable 6f or the sub-transmission cable 7f, and if no failure is detected here, the main transmission is then carried out in the same way. cable 6e,
Alternatively, the station 4e can be connected to the station 4e via the sub-transmission cable 7e.
A failure detection command is input to the station 4e, and when a failure is detected, a transmission direction switching command is input to the station 4f adjacent to this station 4e, and the transmission direction is switched here to switch the failed station 4e. to avoid
Transmission of transmission signals is carried out. Therefore, the transmission signal is transmitted from the central station 4a on the one hand to the main transmission cable 6m, 6m on the other hand.
b, 6c, the transmission direction is switched at station 4d, and sub-transmission cables 7e, 7b, 7
Return to the central station 4a in the order of a. The transmission signal is in the other direction, passing from the central station 4a through the main transmission cable 6f, changing the transmission direction at station 4f, and returning to the central station 4m through the sub-transmission cable 7f.

In this way, even if station 4e fails, a transmission path is formed only by the remaining normal stations 4, and the transmission operation can be continued. However, this data transmission device also has the following drawbacks.

That is, a duplex transmission cable consisting of the main transmission cable 6 and the sub-transmission cable 7 and a corresponding duplex transmission/reception circuit are required, and a complex auxiliary circuit to perform the switching operation between them is required. In some cases, software processing by a microcomputer is required, which increases the cost of the data transmission device.

In addition, the central station 4a is used to determine the location of the failure.
Since the return operation test of the transmission line of each station 4 must be sequentially performed from the start, it takes a long time to recover, and the continuity of data transmission may not be maintained.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances. When a station or transmission cable fails, the failed station or transmission cable can be disconnected quickly and without incurring any cost, and the normal station can be disconnected. SUMMARY OF THE INVENTION A data transmission device according to the present invention provides a data transmission device that can continuously transmit data by using a transmission cable as a transmission line. 2 to 2, which conducts the first and second terminals and the third and fourth terminals when an external switching side sub-signal is input from the outside.
The third and fourth terminals of the pino-hira switch phase 1 are connected in a loop by a transmission line, and the first and Is2 terminals V of this 2-to-2 pin switch phase 1 have a self-failure detection function. and when a failure is detected, the 2 to 2 pi
This purpose is achieved by connecting a data transmission control station that outputs an external switching side auxiliary signal to the switch and switch.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 13
The figure is a schematic configuration diagram showing an embodiment of a data transmission device according to the present invention. In FIG. 3, ff? 11 is connected to the horizontal calculation computer 8 section 9a. This transmission line input/output terminal 10B, 10b of station 9a and the 2-to-2 guino! which will be described later. The first and second terminals 13m and 14m of the switch (BSW) 77g are connected by branch transmission cables 15aI and 15a.

And the 3rd and 4th of 2 to 2 Nono Inoya Switch 11M
Main transmission cables 18m and 1 are connected to terminals 16a and 17m of
One end of 1Je is connected, and these constitute a small loop transmission path.

Thereafter, the process controllers 19a, 19
b, or process input/output device 20a, 20b', 2
The station 9 to which 0c is connected is connected two-to-two with its transmission line input/output end 10. And this 2 vs. 2 pie, 9th switch U's third. The fourth terminals 16 and 17 are each 'F, and a transmission cable 18 connects each station 9 to form a large loop transmission path, excluding station 9a to which the separate calculator 8 is connected. Station 9 has an output terminal 21 for switching constraints. These stations 9 have self-failure detection function H,
When a failure is detected, a switching command signal is output to the switching restriction output terminal 2. Further, the switching restriction output terminal 21 and the switching side input terminal 22 of the 2-to-2 Inno-Suits 1,110 are connected by a restriction cable 23.

Next, the principle of operation of the 2:2/4' switch 11 will be described. Figure 4 (al, (bl is this 2 vs. 2
This shows the two operating states of the bypass switch 11, the $1 terminal 13, the second
terminal 14, third terminal 16, fourth terminal 11, and a switching control signal input terminal 22 into which a signal for switching these connection combinations is inputted from the switching restriction output terminal 21 of the specified station 9. what are you doing. The first thousand and seventeenth cables have main transmission cables 1 connecting each station 9.
8 are connected. Further, the input end for switching control of this 2-to-2-pi/9-switch switch 1 is connected. and,
Normally, as shown in FIG. 4 (11), the first terminal I3 and the third terminal 16 are electrically connected, and the second terminal μ and the fourth terminal are electrically connected. Therefore, the transmission signal passes through the main transmission cable Jfi to the third terminal 16 of the 2-to-2) 9 Inosos switch, the first terminal 1jl, and the branch transmission cable. 1s to the transmission line input/output end 10 of station L, where the transmission signal is exchanged, and then from the transmission line input/output end 1() to the branch transmission cable 15, a 2-to-2 bypass is transmitted. is transmitted to the second terminal L4 of the switcher 11, and
The signal is transmitted to the main transmission cable 1B through a fourth terminal H electrically connected thereto.

FIG. 4 (When in the state of AL, when a switching command is manually inputted from the station 9 to the switching control input terminal L of the 2-to-2, 2, 1, and 2 switch U via the control cable), Fourth
As shown in Figure (b), the internal taps of the 2-to-2 bypass switch 11 are switched. That is, the transmission signal is transmitted through the second transmission cable L! The signal is then inputted to the third terminal of the 2-to-2 PI I4 switch 11, and transmitted to the main transmission cable 18 again through the electrically connected fourth terminal 17. On the other hand, station y9LD transmission line input/output end, Jin!
The branch transmission cable 15 connected to the 2-to-2 connection! switch, the first terminal is of ξ and the terminal of $2 -
L is connected in series and becomes an open circuit here.

Next, the operation of this data transmission device will be explained with reference to FIG. FIG. 5 shows the data transmission device according to the present invention shown in FIG. 3, where stations 9d, 9e,
FIG. 9 is a diagram for explaining the operation between 9f. In FIG. 5(a), if no operation stoppage or error occurs during the code check of the transmitted signal within each of the stations 9d, 9e, and 9f, the self-failure detection function recognizes that the station is normal, and The first terminal 13 and third terminal 16 of the connected 2-to-2 pino flat switch 1 are electrically connected, while the terminal 14 of fJ2 and the fourth terminal 17 are electrically connected. Connected. Therefore, the transmission signal passing through the main transmission cable 18 is input to each station 9, and therefore the process controller 19a1 process input/output device 20b, 2 connected to this station 9
At 0c, a transmission signal is input.

In addition, in the state shown in FIG. 5 (bl), station 9 d.

At stations 9e and 9f, if an error due to stoppage or code check is detected by the self-failure detection function and it is determined that these stations 9d, 9e, 9f are out of order, this will cause the VJ switching function of each station cong. Output terminal 2
1, a switching command is inputted to the switching side input terminal 22 of the 2-to-2 pi-pass switch 11 through a separate cable 23, thereby causing the internal of the 2-to-2 pi-pass switch 11 to be input. The tap changes. As a result, the first terminal 13 of the two-to-two path switch 11 and the second terminal 1
4 is electrically connected, while the third terminal 16 and the fourth terminal
It is electrically connected to the terminal 17 of. Therefore, the transmission signal that has passed through the main transmission cable is transmitted again to the main transmission cable 18 through the third and fourth terminals 16 and 17 of the 2-to-2-9 switch, avoiding the failed station 9. Transmission continues. Furthermore, in the state shown in FIG. 5(C), stations 9d, 9e, and tB have stopped operating due to their self-failure detection function, or detected an error due to the code check, and in this case, station 9e is recognized to be abnormal. Thanks to the self-failure detection function of each station 9,
When it is recognized that the station 9e is abnormal, a switching command is input from the station 9e to the switching side auxiliary input terminal 22eK of the 2-to-2 inch diameter bus switch Ile, thereby switching the internal tap. As a result, the first terminal 13e and the second terminal 14e of the 2-to-2 pinot switch 1.1e to which the station controller 9e is connected are electrically connected, and the third terminal 16e and the fourth terminal 1.1e are electrically connected. It is electrically connected to the terminal 17e of.

By the above-mentioned operation, the main transmission cable L! ! By,
The transmission signal transmitted in a loop avoids the station 9e and is transmitted to other normally operating stations 9. According to the embodiment of the present invention described above, each process controller 19 or Using a small loop transmission path consisting of the input device 20, the second transmission cable, and the 2-to-2 wire switch 11, the self-detection function can perform loopback inspection of its own transmitted and received data. It is possible to inspect each loop transmission path for abnormality in transmission operation, disconnect the abnormal station L, and create a large loop transmission path using only the other normal station 9 to perform data transmission. Become.

In addition, since each station is connected with only the main transmission cable to form a large loop transmission path, it is possible to lay two transmission cables, or to lay a control cable that directly connects the central station and each station. Compared to the case where the transmission line is installed, the number of transmission lines is a single exposed tunnel, and the construction cost is also lower.

Furthermore, since positive abnormalities can be detected simultaneously for each transmission route, the time required to stop data transmission for detection is shorter than when detecting each stage sequentially, and the reliability of data transmission is improved. It gets expensive.

On the other hand, self-failure of positive abnormality in each small loop transmission path 1)
The Yarn detection function can be easily implemented by checking the code by handing between the process controller 19 or the process input/output device Nμ and the station yarn, so the device can be simplified. There is.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, the transmission signal may be an optical signal in addition to an air signal, and the transmission cable may be an electric conductor, an optical fiber cable, or the like. It goes without saying that the present invention can be implemented with various modifications.

〔Effect of the invention〕

According to the present invention described above, when a station or transmission cable fails, it can be disconnected quickly.
Moreover, it is possible to provide a data transmission device that can be implemented without increasing cost and that can continue data transmission by cutting out a transmission path using only normal stations and transmission cables.

[Brief explanation of the drawing]

Figure 1 and Figure 2 are schematic diagrams showing an example of B1 and Figure 2 of a conventional data transmission device] Figures 1 and 3 are schematic diagrams showing an example of a data transmission device according to the present invention. Sunny e, figure, 4th
The figure shows 2 to 2 pino used in this invention! FIG. 5 is a diagram for explaining the operation principle of the switch, and FIG. 5 is a diagram for explaining the operation of one embodiment of the present invention shown in FIG. 3. 8... Computer for open side (CPU), 9... Station (8TN), 10=-- Transmission line person output end, 11...
・2 to 2・Qui has switch (Bsw), 13° work LΔ
, 16, I 7-2 to 2 bypass Switchino 1st
, 2nd. Third. 4th terminal, and...branch transmission cable, U()...main transmission cable, UNO...process controller (PC), 20...process input/output device (
%). Applicant's representative Patent attorney Takehiko Suzue Figure 3 Figure 4 (a) (Cause 5 (a) Cb)

Claims (1)

[Claims] 1st. Second. Third. Equipped with a fourth terminal, external switching control I
] between the first and fourth terminals when no signal is input;
and two pairs that conduct between the second and third terminals, and conduct between the first and second terminals and between the third and fourth terminals when an external switching control signal is input. It is connected to the 2-to-2 pin/IF switch via a transmission line to the $1 and second terminals of the 2-to-2 pin/IF switch, and has a self-failure detection function, and when a failure is detected, the A transmission station unit consisting of a data transmission control station that outputs an external switching sub-phase) signal to the pair 2 switch, and a data transmission control station that outputs the external switching sub-phase) signal to the pair 2 switch, 1. A data transmission device, characterized in that the data transmission device is connected in a loop shape through a transmission path.