JPS6367846A - On-ship local area network system - Google Patents

Abstract

PURPOSE:To improve the reliability of a system by gathering and transmitting general information from general node groups through the 1st optical fiber cable, gathering important information from an important node group through a 2nd optical fiber, and transmitting it by radio through a radio device. CONSTITUTION:All pieces of information of all systems and devices on a ship are handled by a general information LAN system consisting of the 1st optical fiber cable CA10 and general node groups 11 11-19. Further, only the important information to be sent to a ship company, etc., on the ground is handled by an important information LAN system consisting of the 2nd optical fiber cable CA20 and important node groups 21-23, 27 and 28. Then those LAN systems are provided independently on the ship. Consequently, even if the important information LAN system, for example' damages and is disable to send the information, its influence never extends to the general information LAN system, so the important information is gathered by the general information LAN system and transmitted by radio to the ground through the operation of the radio device 30.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a local area network system (hereinafter abbreviated as LAN system) that is spread throughout a ship and is used to transmit and collect a large amount of information from various systems and devices. )
Regarding.

[Conventional technology] Generally, in super-automated ships or ships with reduced size, various information obtained from all systems and equipment on board the ship is automatically collected and monitored on board the ship as well as on land. The information is transmitted to shipping companies, etc. using wireless means to improve the safety of navigation. For this reason, a so-called LAN system is formed in a ship, in which various systems and devices are connected and transmission lines are laid out.

In conventional LAN systems, multi-core stranded cables or coaxial cables are used as transmission lines, but because there are noise sources such as generators inside ships, these cables are susceptible to noise. It was easy. Furthermore, since it is difficult to transmit a large amount of information at high speed, it is not suitable for increasing the speed of information processing.

Therefore, recently, optical fiber cables are being used as transmission lines for shipboard LAN systems.

This optical fiber cable is not easily affected by noise, can transmit a large amount of information at high speed, and is suitable for high-speed information processing.

Figure 2 shows a duplex optical fiber cable CA1. CA
2 is a schematic diagram of a shipboard LAN system using optical fiber cables CAI and CAI.
2 (CA2 is for standby) are connected in a ring shape through a plurality of node groups 1 to 9 that have built-in electrical/optical conversion circuits that convert electrical signals from each system and device into optical signals,
It is also connected to the wireless device 10 to perform wireless communication between each of the node groups 1 to 9 and the land.

[Problem that the invention attempts to solve] However, the optical fiber cable CAI mentioned above.

Ship LAN systems using CA2 have the following problems. In other words, a 2-core optical fiber cable is used as the 2M groove structure optical fiber cable CA1.0A2 due to cost considerations, but in this case, when an external mechanical force is applied to the cable, the cable does not have flexibility. Both wires were disconnected, causing the ring to be disconnected and the system to go down. Further, each of the nodes 1 to 9 also has a double circuit configuration, but in this case, if the node itself is flooded with water, fire, or receives external mechanical force, both of the double circuits will fail and the system will go down. Therefore, the above problem can be solved by independently stringing two sets of single-core optical fiber cables, equipping 2III nodes independently, and connecting them to each other, but in this case, the cost is extremely high and , it was difficult to realize this because it required a great deal of effort for connections and the like.

The present invention was made based on these circumstances,
The aim is to create a local area for ships that is resistant to noise, can process a large amount of information at high speed, has accident resistance and can improve reliability, is easy to configure, and does not have to worry about high costs. The purpose is to provide a network system.

[Means for solving the problems] In order to solve the above problems and achieve the purpose, the present invention has the following features:
A group of general nodes that collect all information regarding all systems and devices inside the ship are connected in a ring shape by a first optical fiber cable, and only important information inside the ship is collected independently of the group of general nodes. The first... Of the information transmitted and collected via the second optical fiber cable ring, a small amount (or important information) is wirelessly transmitted by a wireless device.

[Effect] By taking such measures, all information regarding all systems and equipment onboard the ship can be shared by the general node group in the first place.
The important information to be collected and transmitted through the second optical fiber cable and further transmitted wirelessly to land etc. is collected by the important nodes via the second optical fiber cable and wirelessly transmitted by the wireless device.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of a ship's LAN system according to the present invention. In the figure, reference numerals 11 to 19 denote a general node group that is connected to all systems and devices in the ship and includes an electrical/optical conversion circuit that converts electrical signals from each system and device into optical signals. That is, 11 is a navigation system node, 12 is a cargo control system node, 13 is an engine control system node, 14 is a cargo hold node, 15 is a deck node, 16 is an auxiliary aircraft node, and 17 is a main engine node. , 18 is a marine node, 19
is a residential area node. These general node groups 11 to 19 are connected in a ring shape by a first optical fiber cable 0AIO, and information from systems and devices collected by each node group 11 to 19 is transmitted. ing.

On the other hand, in the same figure, 21.22.23.27 and 2
8 is an important node group, and the general node 8 ¥11 ~
This is a group of nodes that are equipped independently from 19 and collect only important information for transmission to onshore shipping companies and the like for monitoring. That is, 21 is a node that handles only important information in the navigation system, 22 is a node that handles only important information in the cargo control system, 23 is a node that handles only important information in the passenger control system, and 27 is a node that handles only important information in the cargo control system. A node 28 handles only important information in the marine equipment. And these important node groups 21~
23, 27, 28 is the second optical fiber cable CA20
are connected in a ring shape by each node group 21~
Important information from systems and equipment collected on 23.27.28 will be transmitted.

Further, 30 is a wireless device, and the first. Second optical fiber cable CA10. Connect each CA20,
Each cable CAl0. It has a function of wirelessly transmitting information transmitted via the CA 20 to a shipping company on land.

In this actual example system configured in this way, systems and devices that generate important information that is transmitted to and monitored by shipping companies on land at any time, such as navigation systems, cargo control systems, engine control systems, main a and marine Each device is equipped with two sets of information output terminals. Then, all the information of the corresponding device is read through one set of output terminals,
This is connected to general cards 11, 12, 13 and 17, 18, respectively. Also, only important information is handled by the other set of output terminals, and this is in important mode 21.22.
23, 27, and 28 respectively.

On the other hand, there are other systems and devices that generate only information that does not need to be transmitted to shipping companies from time to time, such as cargo hold devices, deck devices, and auxiliary equipment.

The residential area equipment has one set of information output terminals, and all information is handled through this terminal. Each information output terminal is connected to general nodes 14.15° and 16.19, respectively.

Since the first optical fiber cable CA10 is connected to all the general node groups 11 to 19, it collects and transmits all information from each system and device. Further, the second optical fiber cable CA20 connects the important node group 21
Since only 23.27°28 is connected, only the necessary f2 information from the corresponding system and device is collected and transmitted. Then, by the action of the wireless device 30, this important information is wirelessly transmitted to a land-based shipping company or the like at any time.

As described above, according to the present embodiment, the general information LAN system consisting of the first optical fiber cable CA10 and the general node groups 11 to 19 handles all information on the ship's cash system and equipment, and the second optical fiber cable ca
The LAN system for important information, which consists of a group 20 and a group of important nodes 21 to 23, 27, and 28, handles only important information that must be transmitted to shipping companies on land. These LAN systems are installed independently within the ship. Therefore, even if, for example, the LAN system for important information is damaged and cannot be transmitted, the LAN system for general information will not be affected, and the important information will be collected by the LAN system for general information. ! ! The action of the device 30 causes wireless transmission to land. Further, even if the general information LAN system becomes unable to transmit, important information can be collected by the normal important information LAN system. In other words, as far as the important information needed by shipping companies to monitor ships, we have two completely independent LAN systems, so we can provide complete backup against cable and node accidents. A highly reliable information and communication system will be obtained, contributing to improved navigation safety. In general, the number of important nodes is small and they are often installed in a concentrated manner inside a ship, so the optical fiber cables connecting the important nodes need only have an acceptable capacity and be short. Therefore, the network can be easily installed, and both equipment costs and maintenance costs can be lowered than when two sets of the same LAN system are installed independently.

"Effect of R Light" As detailed above, according to the present invention, a group of general nodes that collect all information regarding all systems and devices in a ship are connected in a ring shape by a first optical fiber cable. At the same time, an important node group that collects only important information inside the ship is equipped independently of the general node group, and these @ important node groups are connected in a ring shape by a second optical fiber cable. Since at least important information among the information transmitted and collected via the second optical fiber cable ring is transmitted wirelessly by wireless equipment, it is resistant to noise, can process line information at high speed, and is accident resistant. It is possible to provide a local area network system for ships that has excellent performance and improved reliability, is easy to configure, and is not likely to be expensive.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a marine LAN system according to the present invention, and FIG. 2 is a schematic diagram showing a conventional marine LAN system. 11-19... General node group, 21-23.27°2
'8...Important node group, 30...Wireless device, CA1
0: first optical fiber cable, CA20: second optical fiber cable.

Claims (1)

[Claims] A general node group that collects all information regarding all systems and devices in the ship; a first optical fiber cable that connects these general node groups in a ring; A group of important nodes that collect only important information, a second optical fiber cable that connects the group of important nodes in a ring, and information transmitted and collected via the first and second optical fiber cables. What is claimed is: 1. A local area network system in a ship, comprising a wireless device that wirelessly transmits at least important information.