Independent test link for distributed control system (DCS) field control station system diagnosis

Abstract

The invention discloses an independent test link for DCS field control station system diagnosis. The independent test link comprises a main control unit (MCP) connected with an industrial personal computer (IPC) and an input / output (IO) module which is connected with the MCP and used for collecting site signals, an independent data communications link, a redundant data communication link and a test link are connected between the MCP and the IO module, and the MCP and the IO module control links to operate independently through respective field programmable gate array (FPGA) modules. According to the independent test link, test link physical independence and test function processing logic independence are achieved, test link independence from the physical entity to the processing logic is achieved, faults of the test link can be prevented from spreading, and simultaneously, network loads of other data links are reduced and the reliability of the whole system is increased. An FPGA technology is used to achieve the test function processing logic. Compared with a traditional central processing unit (CPU) technology, the whole research and development cost and the material cost are low.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a safety test system for diagnosing the DCS field control station system of a nuclear power plant. Background technique [0002] In the DCS system, the on-site control station connected to the industrial computer plays the function of core data processing. The on-site control station mainly includes two parts, the main control unit and the input and output module (IO module). The IO module completes the collection and processing of on-site signals. Output (including analog and digital), the main control unit is the core part of the field control station, and completes data processing, calculation, system configuration, management and other functions. The data interaction between the main control unit and the IO module is mainly realized through the bus. In addition to the normal data collection and output functions of the field control station, in order to ensure the reliable o...

AI Technical Summary

Problems solved by technology

In some occasions of nuclear power, it is required that the safety function and auxiliary function need to be implemented independently to ensure the normal operation of the safety function. If the function cannot be independent, the auxiliary function must be developed according to the safety function requirements, which will greatly increase the cost.

If this is not done, when any part of the test function in the traditional microprocessor-based on-site control station fails, the fault will spread, which will affect the normal IO data collection and output, causing more serious consequences; in addition, The test function and the IO data acquisition function are implemented on the same link, which greatly increases the network load of the link. High network load will increase the processing complexity and reduce the overall reliability of the system.

In addition, if the DCS system with the basic CPU system architecture wants to truly separate the test function from the normal data collection function, it also needs to use a dual-CPU architecture and two sets of software for support at the same time, and the development cost is very high.

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