Functional safety type HART measuring system

Abstract

The invention provides a functional safety type HART measuring system. The system comprises a signal input sampling circuit used for acquiring temperature signals and a signal output circuit connected with an output terminal of the signal input sampling circuit, wherein the signal input sampling circuit comprises a first diagnosis circuit, the first diagnosis circuit comprises a first A / D sampler, a second A / D sampler, and a signal comparator, the first A / D sampler is used for sampling the temperature signals acquired by the signal input sampling circuit and sending first sampling signals to the signal comparator, the second A / D sampler is also used for sampling the temperature signals and generating second sampling signals, and the signal comparator is used for comparing the first sampling signals and the second sampling signals and outputting fault signals when the comparison result is beyond a preset deviation so that the signal output circuit outputs current smaller than a fault theoretical value when receiving the fault signals, the diagnosis function of the HART measuring system is realized, and the equipment security is greatly improved.

Description

technical field [0001] The present invention relates to a HART measurement system, in particular to a function-safe HART measurement system. Background technique [0002] The existing HART temperature measuring instrument only realizes the function of temperature signal conditioning, transmission output and HART (HighwayAddressableRemoteTransducer, an open communication protocol for addressable remote sensor high-speed channel) signal communication function. It can only monitor the fault of the input signal, and cannot If a fault occurs inside the instrument, if a fault occurs inside the instrument, the fault signal will be output when the input signal is normal, or the normal signal may still be output when the input signal is abnormal; the former may cause subsequent production equipment to stop by mistake, etc. The situation may cause huge economic losses; while the latter may not report to the police the dangerous factors on site, which may cause damage to equipment, and...

AI Technical Summary

Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a functionally safe HART measurement system to solve the problem that the existing HART temperature measuring instrument has no diagnostic function in the prior art

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