JPS6242422B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a protection line that is detoured between a control center and a plurality of controlled stations that are connected in tandem by a regular line through a code relay device corresponding to each controlled station device. This relates to an information transmission system that has been established, and its purpose is to prevent information transmission interruptions that occur between controlled center equipment and control center equipment located beyond the point of failure when a fault occurs in a regular line.

In an information transmission line configuration in which a control center device and multiple controlled center devices are connected in tandem, information is usually transmitted between the control center device and each controlled center device using a regular line. However, if a line failure such as a disconnection occurs in the regular line of the information transmission device, information transmission between each controlled station device and the control center device located far from the point of failure will be interrupted.

Conventionally, the following methods have been used to counter the above-mentioned failures. One of them is called the line backup system, which involves, for example, when transmitting information between Tokyo and Osaka, a wireless line and a wired line are installed in parallel, and if one fails, the other is used. It is. The other method is called the space diversity method. For example, when transmitting information between Tokyo and Osaka, a line via Tokaido is normally used, but if that line breaks down, a line via Hokuriku is used. The idea is to do so.

However, adding each of the above-mentioned systems to an existing information transmission device requires the entire system to be very expensive, requires many changes to the existing equipment, and has the disadvantage that the system is out of service for an extremely long time.

The present invention can be easily connected to a controlled station device through a circuit via an openable/closable connection terminal, and only has a simple code relay device for level correction corresponding to each controlled station. A backup line is provided, and the same information as the regular line is transmitted in the opposite direction via a code relay device corresponding to the farthest controlled station equipment from the control center, and the same information as the regular line is transmitted in the event of a failure in the regular line. , the information is transmitted to the equipment in the controlled facility beyond the point of occurrence through the backup line, without changing the existing equipment or affecting the regular line, and in addition, the transmission function of the backup line is improved. This system is designed to improve reliability by making it possible to constantly monitor the system at the control center.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1 is a general diagram of the information transmission line arrangement showing the basic configuration of the present invention, where CC is a control center equipment shown in blocks including a code repeater and SHF terminal station, which will be described later, and A to G are commonly used control center equipment. Controlled plant equipment connected in cascade from the control center equipment CC via information transmission line _L1 , a
~g corresponds to the controlled center devices A to G, respectively, and are cascade-connected through a backup information transmission line _L2 , and FS ₁ and FS ₂ are code relay devices connected to the control center device CC and the farthest end. This is an existing transport coupling device that connects equipment g with SHF. Blocks surrounded by one-dot chain lines indicate control centers that house the control center device CC, and blocks surrounded by one-dot chain lines indicate controlled center devices A to G and their corresponding code relay devices. Controlled stations accommodating a to g, respectively, are shown.

Furthermore, in each of the controlled stations, the arrows shown from the code relay devices a to g to the corresponding controlled station devices A to G are normally in an open state, but they are indicated by cross marks in the figure. For example, if a line failure occurs in the regular line _L1 connecting the controlled station devices C and D, this indicates that the connection circuit connects the controlled station device D and the code relay device d.

In the system line shown in Fig. 1 above, the regular line _L1 is used to connect the control center equipment CC and the controlled center equipment A to G.
control center equipment while simultaneously transmitting information between
A detour is made from the CC to the farthest code relay device g via the SHF carrier coupling devices FS ₁ and FS ₂ , and the same information as the line L ₁ is transmitted in the opposite direction from the regular line L ₁ to the code through the protection line L ₂ . The signal is transmitted in the direction from relay device g to direction a.

Now, let's talk about the case where a line failure occurs at the point marked with the above X in the regular line _L1.In this case, the regular line _L1 on the control center equipment CC side is disconnected inside the controlled station E, and the arrow shown in Fig. As shown in , the controlled station device D is connected to the backup line L ₂ connected to the controlled station E. In this way, controlled center devices A to C and control center device CC can be connected to the regular line _L1 as before the line failure, and controlled center devices D to G and control center device CC can be connected to each other by a backup line. Since information can be transmitted using _L2 , it is possible to prevent information transmission from being lost to the controlled station devices after D due to line failure.

FIG. 2 is a specific example of the configuration of the present invention centered on the controlled station H adjacent to the failure point of the common line _L1 indicated by the cross in FIG. This is the same as in E except for control stations B and C, so their illustration is omitted. Regarding the illustrated controlled stations B and H at both ends, explanations will be omitted regarding the parts that are considered to be the same as E, except for the special functions located at the respective side ends. In addition, the outline of the equipment configuration in control station A is as follows: a control device CC, a code relay device CR similar to the code relay devices a to g provided at each controlled station, and a terminal station of the transport coupling device FS ₁ of SHF.
The control device CC is connected to each controlled device by transmission lines _{l 1-1 and} l _1-2 that constitute the regular line L ₁ .

Therefore, the device, circuit configuration, and operation of the controlled station E will be explained. First, the controlled center device D has the function of inputting control information from the control center device CC, performing local operations based on the control commands, and returning information on the operation results to the control center device CC, and transmitting information codes. The regular transmission lines l 1-1 and l _1- consist of a logic device with a code relay function to correct the level, and are connected by normally openable and closable terminals T _1-1 and T _{1-2 .} Information is input or output through ₂ . Up to this point, the existing devices and circuits are not directly related to the present invention.

Next, to describe the circuit configuration according to the transmission method of the present invention, the code relay device d is a simple device that is composed of an amplifier or a resistive attenuator, etc., and that appropriately corrects the level of the input information signal and relays it. ,
Its input/output circuit is the transmission line that constitutes the protection line L ₂ .
l _2-1 , l _2-2 , and the transmission lines l _2-1 and l _2-2 are connected to connection terminals T _2-1 , T _2-2 , T _3-1 , and T _3-2 that can be opened and closed, respectively. Therefore, as shown in the figure, it is cascaded to each controlled station code repeater in the direction of the control station and the terminal direction. Also, a connection circuit for connecting the spare transmission lines l _2-1 , l _2-2 and the regular transmission lines l _1-1 , l _1-2 in the event of a regular line failure.
l _3-1 and l _3-2 are provided via connection terminals T _4-1 and T _4-2 shown with broken lines to indicate that they are normally open.

The above explanation uses controlled station E as a representative example.
l _2-1 and l _2-2 have their respective terminals short-circuited by terminal T ₅ , and the backup transmission lines l _2-1 and l _2-2 at the terminal controlled station are connected to the carrier coupling device FS. ₂ terminal stations ET ₂
and communicated to the control center equipment CC via SHF.

To explain the operation of the information transmission system with the circuit configured as described above, first, during normal times when the regular line L ₁ is used, terminals T _1-1 and T _1-2 are connected, and terminal T ₄ is connected. Since _-1 and T _4-2 are open, information transmission is performed through the transmission lines l _1-1 and l _1-2 . Next, as mentioned above, connect the regular line _L1 , that is, the transmission line, at the point marked with an x between the controlled stations D and H.
If a fault occurs in l _1-1 , l _1-2 , terminals T _1-1 ,
T _1-2 and protection line L ₂ i.e. transmission line l _2-1 , l _2-2
Open terminals T _2-1 , T _2-2 , T _3-1 , T _3-2 of
Connect T _4-1 and T _4-2 . As a result, information for the controlled station devices D to G that are further away than the line failure point marked with an X is routed from the control center device CC via SHF to the terminal station ET ₂ of the controlled station C at the end. Pass through the transmission lines l _2-1 and l _2-2 , and then connect the terminals T _4-1 ,
Circuit connected to controlled station device D via _T4-2
It is transmitted by the routes l _3-1 and l _3-2 . It goes without saying that information is transmitted to the controlled station devices A to C through the regular line _L1 .

In this way, even if a line failure occurs, information will be transmitted to the controlled station before the occurrence point via regular line _L1 , and information to controlled stations beyond the occurrence point will be transmitted via regular line _L2. can be done.

As mentioned earlier, the protection line _L2 transmits the same information as the regular line _L1 in the opposite direction, but as explained in Figure 2, the terminal T of the controlled station Since the terminals of the transmission lines L _2-1 and L _2-2 are short-circuited by _T 5, the transmitted information is returned to the control center device CC via the terminal T ₅ , so that the returned information cannot be received. By monitoring, backup lines are installed at the control center.
You can check the line status of _L2 .

As described above, the information transmission method of the present invention is
Simply use the detour route using the existing SHF carrier coupling equipment, install a backup transmission line with an information code level correction function, and install a connection circuit for each controlled station that connects to the regular line only in the event of a failure of the regular line. By providing backup line equipment that enables constant monitoring without changing existing equipment, it is highly effective in improving the reliability and economy of information transmission.

[Brief explanation of the drawing]

The drawings show an embodiment of the information transmission system of the present invention. Figure 1 is a schematic diagram of an information route connecting a control center and a controlled station in cascade, and Figure 2 is a diagram of a specific circuit example of the information transmission route. be. L ₁ : Regular information transmission line, CC: Control center equipment,
A to G: Controlled station equipment, _FS1 , _FS2 : Carrier coupling device, a to g: Code relay device, _L2 : Backup information transmission line, _l1-1 , _l1-2 : Regular transmission line, l _2-1 , l _2-2 : Backup transmission line, T _1-1 , T _1-2 , T _2-1 , T _2-2 , T _3-1 ,
T _3-2 : Connection terminal, l _3-1 , l _3-2 : Connection circuit, T _4-1 ,
T _4-2 : Connection terminal, T ₅ : Protection line terminal connection terminal.

Claims (1)

[Scope of Claims] 1. In an information transmission device in which a control center device and a plurality of controlled station devices are cascade-connected and mutually transmit information through a common line, a control center and the farthest controlled station are connected. a detour transmission line connected to the end of the detour transmission line of the farthest controlled station and cascadingly connecting each controlled station, and this line and the regular line,
At each controlled station, a backup transmission line consisting of a line that can be connected using a connection mechanism that is always open is installed, and a regular line and a backup line that cascade connects each controlled station are connected to a line that is normally closed. An information transmission method characterized by disconnecting a regular line at a required controlled station and transmitting information via a protection line without changing existing equipment by appropriately inserting a releasable connection mechanism. . 2. Claims characterized by having a function of checking the protection line by short-circuiting the terminals of the protection line, returning transmissions to the protection line, and monitoring the information received at the control center. The information transmission method described in Section 1.