Multifunctional measurement and control module based on field bus

Abstract

The invention relates to a multifunctional measurement and control module based on a field bus, comprising a multi-path selection module, a signal conditioning module, an isolating and amplifying circuit, an A / D conversion and control module that are sequentially connected. An acquiring signal is input into the multi-path selecting module, then conditioned and converted by the signal conditioning module, sent to the isolating and amplifying module for isolation and amplification, and enters the A / D conversion and control module; a simulating signal is converted into a digital signal by the A / D conversion; and a signal processed by the control module is output by a communication interface with field bus function. By matching the multi-path selecting module with the signal conditioning module, each channel can access a plurality of signals, can be matched with a programmable amplifier by the introduction of a high-accuracy reference voltage, and can be used for measuring the current real amplification factor, thereby eliminating the drift caused by the null drift of the amplifying module.

Description

technical field [0001] The invention relates to a signal acquisition module, in particular to a multifunctional measurement and control module based on field bus. Background technique [0002] Data acquisition technology is an important branch of information science. It forms the basis of modern measurement and control technology together with sensing technology, signal processing technology, computer technology, control technology, field bus and network technology. It studies the conditioning, transformation, acquisition, storage, processing, recording, display, transmission and control of information data, and is widely used in the fields of measurement, monitoring, monitoring, control, diagnosis, scientific experiments and management. In scientific research, it is One of the important means of obtaining scientific mysteries. With the development of science and technology and the wide application of data acquisition systems, people have put forward more and more important...

AI Technical Summary

Problems solved by technology

[0003] The current acquisition technology generally has the following problems: 1. The accuracy is not high, generally around 1%, and some only reach about 0.5%

2. Low resolution

3. The isolation between the signal input terminal and the amplifier is not good, resulting in poor anti-interference ability

4. The zero point drift of the amplifier occurs

5. Can not adapt to a variety of signal input, especially not suitable for direct access to sensors

6. No automatic temperature compensation

7. It does not have fieldbus function, let alone has multiple fieldbus functions at the same time

The above existing problems lead to inaccurate signal acquisition, which affects the measurement results, and cannot adapt to modern bus signal acquisition and control

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