Autonomous system with redundant configuration and its configuration method

Abstract

The invention discloses a self-controlling system of a redundant configuration, which comprises a plurality of subsystems mutually connected, each subsystem is provided with an input module, an output module, a main controller and a data transmission bus, the input module and the output module are respectively connected with the data transmission bus; the main controller is provided with a bus controller; the quantity of the bus controller of each main controller is equivalent to the quantity of the subsystems, each bus controller of each main controller is respectively connected with the data transmission bus of each subsystem; the input module of each subsystem sends input signal to the bus controller of the subsystem, and sends output signal to the output module of the subsystem after the calculation and processing of the main controller of the subsystem, all output modules are voted according to the output signal and then feedback the voting result to self-own bus controller. The invention is characterized in that: each bus has an only controlling right; only when occupying controlling right, the node has the right of sending data; the controlling right is delivered to network downstream neighbor after the node finishes data sending task.

Description

technical field [0001] The invention relates to an automatic control system, in particular to a redundantly configured automatic control system and a configuration method. Background technique [0002] In order to improve the reliability of the automatic control system, the technical means of redundant configuration is usually adopted. For example, domestic and foreign steam turbine ETS control systems all adopt a triple-redundant system. The control strategy of this system is to ensure the high reliability of the entire system by adopting the method of complete hardware redundancy and tokens, and transmit data through the data bus. The data bus adopts logical token ring as the media access control protocol. Each node on the bus has the right to obtain tokens to send data. There is no main communication controller on the bus. Through various types of data interfaces, the bus controller , communication module and bus interface unit to realize the communication network. This...

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Problems solved by technology

[0004] But, also there is following shortcoming in this system: 1. communication network is made up of multiple types of data interfaces, bus controller, communication module and bus interface unit etc., is complete hardware redundancy, complex structure, high failure probability, In order to reduce the impact of faults on the system, it is necessary to set up a fault scanning device, which increases the burden on the PLC

2. Due to the complex structure of the communication network, there are many data transmission nodes, long paths, and long data transmission time; 3. Because each set of data transmission needs to be repeated three times, the receiver performs CRC check after receiving the complete data packet, and then returns a confirmation Data packets, data transmission takes a long time, and the response speed is slow

4. Due to the above two reasons 2 and 3, data must be transmitted at high speed, so that some low-speed bus protocols cannot meet such requirements

5. There is no master controller on the bus, which may cause some important control information on the PLC to not be sent out in time; when a device in the system occupies the token, the token cannot be released normally, which will cause the failure of the entire bus

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