DCS analog quantity output AO clamping piece

Abstract

The DCS analog quantity output AO card comprises an analog quantity output 4-20mA module, a main processor module, a communication transmission module and a power supply module; the communication transmission module decodes an analog quantity control value industrial Ethernet signal transmitted by a superior DCS central control unit and sends the decoded analog quantity control value industrial Ethernet signal to the main processing module through a serial protocol, and the main processor analyzes the signal transmitted by the serial protocol according to a set program under the cooperation ofan auxiliary system. Accordingly, the current output value of each channel of the analog quantity output 420mA module is changed, signal output of the analog quantity clamping piece is realized, andthe analog quantity clamping piece participates in the DCS system control process flow; the DCS analog quantity output AO card can solve the problems that a DCS analog quantity output AO card is highin purchase price, large in maintenance cost and single in upgrading and reconstruction selection range, and the DCS analog quantity output AO card is high in cost performance, wide in application range and high in reliability.

Description

technical field [0001] The invention belongs to the technical field of DCS cards, in particular to a DCS analog output AO card. Background technique [0002] With the development of semiconductor technology and information technology, digital control has been realized in most industrial fields at present, and it will be developed towards artificial intelligence in the future. As we all know, the field of industrial automation consists of many complex technological processes, which have the continuity, uninterrupted, reliability and safety of production. Every process control involves a large amount of analog data output. As an important output part, the analog signal should be developed in the direction of simplicity, low cost and unlimited. The control objects in the industrial field need to be controlled by the control unit. Because of the strong anti-interference ability of the 4-20mA current signal, it has become the preferred control signal in the industrial field that...

AI Technical Summary

Problems solved by technology

Regardless of whether it is a new unit or an old unit renovation, each power plant needs a large number of analog output cards. At present, most of the analog output cards are supplied by well-known foreign manufacturers, resulting in continuous investment in the entire life cycle of the cards. Maintenance fees, modification fees and other expenses, if the manufacturer cuts off the supply, will have a very large impact on the manufacturer, and will seriously interrupt the normal production work

At present, the purchase price of the known DCS analog output card is relatively high, the maintenance cost is relatively high, and the upgrade and transformation options are limited.

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