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High-reliability analog quantity output device

An output device and analog technology, applied in the direction of electrical program control, comprehensive factory control, etc., can solve problems such as unsatisfactory reliability, and achieve the effect of improving the coverage of output readback detection

Active Publication Date: 2011-03-30
CHINA TECHENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention provides a high-reliability analog output device aiming at the fact that the reliability of the existing analog output device products cannot meet the requirements of the nuclear station safety level instrument control system

Method used

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Embodiment Construction

[0039]A high-reliability analog output device of the present invention consists of 8-way current output board, D / A conversion module, current drive output module, A / D output readback module, MCU, complex logic programming controller CPLD and communication circuit composition. The board receives the output code value of each channel set by the operation station through the SN1 bus communication protocol and sends it to the D / A controller. / D readback reports to MCU and compares the channel set value to determine whether the output is normal; the board can detect the working status of the MCU itself, supports real-time running status, communication status, fault alarm indication, and has current output open circuit and load fault detection Features.

[0040] See the functional block diagram figure 2 .

[0041] Description of English abbreviations:

[0042] DA Controller is a DAC chip;

[0043] AD Controller is an ADC chip;

[0044] V-I Driver: Industrial-grade voltage-to-...

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Abstract

The invention relates to a high-reliability analog quantity output device, which comprises a (digital)D / (analog)A conversion module, a current driving output module, an A / D output readback module, a microprogrammed control unit (MCU), a complex programmable logic device (CPLD) and a communication circuit, wherein the current driving output module is a current driver which is connected with an output current signal together with a signal connector; one end of the D / A conversion module is connected with a current driving module and the other end of the D / A conversion module is connected with the MCU through a serial peripheral interface (SPI); one end of the A / D output readback module is connected with the current driving module, and the other end of the A / D output readback module is connected with the SPI; and the D / A conversion module receives the configuration data on the downlink of an input output (IO) communication card through an SN1 bus and inputs the configuration data into an DA chip through the channels of the SPI for controlling DA output, the current driving module is provided with alarm output signals, namely error flag for common mode (EFCM) and error flag for load digital (EFLD), the tail end of the current output bus is provided with a signal readback output signal, the output signal read back is processed by the A / D output readback module and returned to the card MCU through the SPI, and the MCU compares the signal with preset values of the channels to determine an output state.

Description

technical field [0001] The invention relates to a high-reliability analog quantity output device, which belongs to the field of signal output of large-scale operating systems. Background technique [0002] DCS is the abbreviation of Digital Control System, which is generally called digital control system in China. It is a multi-level computer system composed of process control level and process monitoring level with communication network as the link. It integrates 4C technologies such as computer (Computer), communication (Communication), display (CRT) and control (Control). The basic idea is decentralized control, centralized operation, hierarchical management, flexible configuration, and convenient configuration. [0003] The control decision of DCS is completed by the process control station, so the control program is executed by the process control station. [0004] The control system needs to establish the input and output channel of the signal, which is I / O. The I / O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/02
CPCY02P90/02
Inventor 程康郝志坚刘伟
Owner CHINA TECHENERGY
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