Redundant and fault-tolerant safety instrument control system based on fieldbus and ARM (advanced RISC machines)

Abstract

The invention provides a design and realization method of a redundant and fault-tolerant safety instrument control system based on a fieldbus and ARM (advanced RISC machines), comprising the following steps: by virtue of redundant and fault-tolerant configuration of a system power supply, input modules, a CPU (central processing unit) and output modules, four core processors communicate with respective and corresponding I / O (input / output) modules by a CAN (controller area network) bus so as to carry out field signal acquisition and control command output, and hardware 2oo4 redundant and fault-tolerant voting is carried out on the output signals of four channels on an output voting module, so that mis-stop of the system caused by single-channel hardware failure is avoided, the function safety level of the redundant and fault-tolerant safety instrument control system is ensured to reach SIL3 (safety integrity level 3), in-time and fast response and protection are carried out on dangerous states of protected field equipment, further a production device enters a predefined working condition of safe stopping, and the safety of staffs, equipment, production and the device is guaranteed.

Description

technical field [0001] The invention relates to a safety control method for industrial process control and a safety instrument protection control device, which can be used in a safety instrument protection system composed of a high-reliability digital signal processing device used in many process control fields such as petrochemical industry and a processing method thereof . Background technique [0002] According to the test, when people are in danger, their judgment and operation are often lagging and unreliable, especially when they are in danger of life, the probability of wrong operation in a short period of time is higher, so the safety instrument with automatic response is set system is necessary. [0003] The safety instrumented system is a special safety protection device, which was first produced in the American aerospace industry. Stanford University and Massachusetts Institute of Technology first began to study the application of fault-tolerant control to aerosp...

AI Technical Summary

Problems solved by technology

[0010] Disadvantages and deficiencies of this system: This structure relies heavily on diagnostics, resulting in a heavy system processor load and slow system speed

[0014] Disadvantages and deficiencies of this system: the safety integrity of a single subsystem is low; if two subsystems fail at the same time, the entire system will stop working

[0018] Disadvantages and deficiencies of this system: the system structure is only 2oo4 for CPU, and I / O must adopt 1oo2D to achieve high fault tolerance

Since the production system (DCS) needs to process a large amount of process monitoring information, the response speed is slow, which is not enough to meet the safety function requirements

[0036] 3. The production system is a dynamic control system that requires human intervention, so human error may occur

[0038] 1. The setting of signal alarm, interlock point, action setting value and adjustment range must meet the requirements of the production process, and its safety interlock control logic must be pre-defined in the safety instrument central controller;

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