NAT device specially used for telecontrol 104 protocol

Abstract

The invention relates to an NAT device specially used for a telecontrol 104 protocol. The NAT device is characterized by including a single-chip microcomputer, an Ethernet control chip and an SD card. An interruption output interface of the Ethernet control chip is connected with an interruption input interface of the single-chip microcomputer. SPI data interfaces of the single-chip microcomputer, the Ethernet control chip and the SD card are mutually connected. Chip selecting interfaces of the SD card and the Ethernet control chip are connected with a chip selecting interface of the single-chip microcomputer. The Ethernet control chip is also connected with an Ethernet interface circuit. The NAT device specially used for the telecontrol 104 protocol is capable of realizing an NAT mapping function of network address ports specially used for the telecontrol 104 protocol and consumes fewer electrical-power scheduling data network access layer IP address resources to replace more-expensive switches and router devices, which are configured to realize the NAT function, with a large number of factory-station-end automation devices so that cost is reduced significantly, work load in site construction maintenance is reduced, security of telecontrol 104 message transmission is reinforced and irrelevant network flow is isolated from a master station.

Description

technical field [0001] The invention relates to a network communication device, in particular to a telecontrol 104 protocol special-purpose NAT device applied to a power grid dispatching automation system. Background technique [0002] In the power grid dispatching automation system, the station-side automation devices, such as the telecontrol terminal RTU and the distribution automation terminal DTU, etc., mainly communicate with the master station through the power dispatching data network using the network 104 telecontrol protocol, while the substation-side power dispatching The service IP address of the access layer of the private data network and the number of available ports of the switch are very limited. When a large number of automation devices need to be connected to the main station, it is necessary to add switches and routers and use the address port NAT mapping technology to solve the problem. This method greatly increases the construction cost and the difficult...

AI Technical Summary

Problems solved by technology

[0002] In the power grid dispatching automation system, the station-side automation devices, such as the telecontrol terminal RTU and the distribution automation terminal DTU, etc., mainly communicate with the main station through the power dispatching data network using the network 104 telecontrol protocol, while the substation-side power dispatching The service IP address of the private data network access layer and the number of available ports of the switch are very limited. When a large number of automation devices need to be connected to the master station, it is necessary to add switches and routers and use the address port NAT mapping technology to solve the problem. This method greatly increases the construction cost and the difficulty of construction and maintenance, and the open protocol service functions of general-purpose switches and routers will also bring network security problems to the power dispatching data private network and increase a lot of unnecessary network traffic. , and does not have the legality checking function of the telecontrol 104 protocol

Images