Functional safe switching value outputting module with high diagnostic coverage rate

Abstract

The invention relates to a functional safe switching value outputting module with a high diagnostic coverage rate, wherein a switching value outputting unit is connected with a microprocessor, so as to convert a digital signal transmitted by the microprocessor into a switching value signal and output the switching value signal; one end of a diagnostic unit is connected with the switching value outputting unit, so as to acquire the switching value signal of the switching value outputting unit; the other end of the diagnostic unit is connected with the microprocessor, so as to feed back the acquired switching value signal to the microprocessor; the diagnostic unit receives a control signal and a configuration signal which are sent by the microprocessor; and the switching value outputting unit and the diagnostic unit jointly form a 1OO1D voting architecture, a switch of the diagnostic unit is mutually connected with a switch of the switching value outputting unit in series, and when a fault occurs, the microprocessor controls the switch of the diagnostic unit to be switched off, so that power supply input is cut off. The functional safe switching value outputting module provided by the invention adopts a DAC combined diagnostic unit having a rich self-diagnostic function as well as an output monitoring unit and a voltage monitoring unit and further improves the diagnostic coveragerate and the reliability and reduces cost and development difficulty.

Description

technical field [0001] The invention relates to the fields of switching output and automatic process control with functional safety requirements, in particular to a functionally safe switching output module with high diagnostic coverage. Background technique [0002] With the rapid development of modern industry, the control scale of industrial production process is constantly expanding, the complexity is constantly increasing, the process is constantly strengthening, and the safety requirements for control systems are also getting higher and higher. In the production process, the safety PLC used to monitor the production process and take corresponding measures to prevent dangerous events under dangerous conditions has gradually been applied. [0003] Functional safety switch output module is a commonly used IO module in safety PLC. The traditional switch output module with SIL3 safety level adopts one of the 1002D or 2003 architectures. The design complexity of these two ar...

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Problems solved by technology

[0003] Functional safety switch output module is a commonly used IO module in safety PLC. Traditional switch output modules with SIL3 safety level adopt one of the 1002D or 2003 architectures. The design complexity of these two architectures is high and the development is difficult. Leading to high product costs, hindering the further promotion and application of functional safety products

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