Method and system for controller diagnostic signal generation, fault protection and functional safety

Abstract

The invention discloses a controller diagnosis signal generation, fault protection and function safety method and system. The controller performs a diagnosis logic while performing a control task, andpulse train signals are generated and used as diagnosis signals to be outputted; a fault protection device detects the diagnosis signals outputted by the controller, if the diagnosis signals outputted by the controller are determined to be non-pulse train signals, fault protection signals are generated. A safety protection circuit for controlling and protecting an object by the controller performs a protection action according to the fault protection signals to realize function safety of the object. Function safety of the controller can be realized, the method and the system are simple, universal and low in cost.

Description

technical field

[0001] The present invention relates to control technology, more specifically, to methods for generating controller diagnostic signals, fault protection and functional safety, as well as corresponding devices and systems. Background technique

[0002] The situation that safety depends on system functions is called "functional safety". While undertaking the process monitoring task, the safety-related system also undertakes the task of safety production risk control. Functional safety prevents the failure of safety-related systems or equipment. resulting in danger.

[0003] Functional safety controllers are a type of specialized controllers that apply risk control systems and methods to design software and hardware. They have high technical requirements, fewer products, and are expensive. At present, there are still quite a few industrial applications, including power plants, due to the need for centralized monitoring and easy maintenance, more safety-related ...

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