A rtu dual-machine redundant acquisition system based on synchronous time window

Abstract

The invention discloses an RTU dual-machine redundant acquisition system based on a synchronous time window, which is composed of a master station, a clock synchronization device, a communication network, a hardware time synchronization network, redundantly configured dual RTUs, multiple IEDs, RIOs, etc. Ethernet is used between RTU and the master station, and Ethernet or field bus is used between RTU and IED / RIO. For the bottom, RTU collects the data of IED and RIO through Ethernet or field bus, and forwards the commands of the master station; for the top, it communicates with the master station through Ethernet, sends the collected data, and accepts the commands of the master station. Through the hardware time synchronization network, the running time of the RTU is divided into uniform time windows that are synchronized between the two RTUs. Each time window is divided into different time intervals, and each time interval completes different tasks in turn. The work between the two machines is completely synchronized, the operating status is completely consistent, the data exchange is reliable, and it can adapt to different working conditions to achieve better redundancy.

Description

technical field [0001] The invention belongs to the field of rail transit and electric power automation systems, relates to an RTU dual-machine redundant operation mode, and is used for constructing a stable and reliable automatic monitoring system. Background technique [0002] The Remote Terminal Unit (RTU) is a special computer measurement and control unit with a modular structure designed for long communication distances and harsh industrial site environments. It combines terminal detection instruments and actuators (or called IED, RIO) are connected with the main computer of the remote control center, have remote data collection, control and communication functions, can receive the operation instructions of the main computer, and control the action of the actuator at the end. [0003] RTU generally adopts an open architecture based on Ethernet and field bus, with programmable logic design, which can seamlessly connect various standard IOs and various intelligent devices...

AI Technical Summary

Problems solved by technology

[0007] 2) Two-machine independent operation mode: two machines work at the same time, there is no distinction between active and standby

During the data acquisition process, since two RTUs perform acquisition (data reading operation) successively, when the state of the data (especially the input state of the switch value) changes, it is possible to read different data, resulting in The data is inconsistent and further affects the result of logic execution

The validity judgment logic when exchanging data between two machines is also relatively complicated, and the state between the two machines cannot be guaranteed to be completely consistent, and the effect of complete redundancy cannot be achieved.

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