High real-time multichannel data acquisition system

A data acquisition system and multi-channel technology, applied in general control systems, control/adjustment systems, instruments, etc. Circuit complexity and other issues, to achieve the effect of improving the real-time performance of the system, flexible software design, and simple hardware circuit

Inactive Publication Date: 2009-02-11
中国兵器工业第二〇六研究所
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Problems solved by technology

The interface between A/D and the main control device mostly adopts direct interface mode, direct buffer mode and indirect buffer mode, etc. The above modes are difficult to meet the requirements of high-precision servo control system data collection. The main problems are:
[0003] (1) The data acquisition system adopts multi-chip, multi-channel direct interface mode. Since the A/D sampling is completely control

Method used

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Embodiment Construction

[0025] The gist of the invention is to introduce programmable logic devices to realize high-speed data acquisition and real-time data transmission of the main controller and multiple A / Ds.

[0026] see figure 1 , In this embodiment, the main controller adopts DSP, the programmable logic device adopts CPLD, and the A / D device adopts a high-speed, four-channel, parallel interface chip AD7865 with 14-bit resolution. The hardware connection method is: connect the data bus of multi-chip A / D to CPLD in parallel, summarize the control signals of multi-chip A / D into an A / D control bus and connect it to CPLD, and the sequential logic of CPLD controls all A / Ds to achieve high-speed Sequence sampling, and the sampling value is latched to CPLD, and mapped to the external address space of the main controller at the same time, so that the main controller reads the A / D sampling data and converts it into an access operation to the external memory, realizing the acquisition of data High-speed...

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Abstract

The invention relates to a real-time multichannel data acquisition system which achieves the effect of high-speed high-accuracy real-time data acquisition of multichannel A/D by adopting a programmable logic device and a multichannel high-resolution A/D converter. The system adopts the programmable logic device as the master controller and the intermediate link for the A/D converter. Based on the temporal logic of the programmable logic device, the multichannel A/D are controlled at the same time to complete the high-speed sequential sampling, the sampling value is latched in the programmable logic device and simultaneously mapped to the external address space of the master controller, and the A/D sampling result is read from the master controller and converted to the visit to an external storage, thereby ensuring the high-speed real-time transmission characteristics of the multichannel data acquisition. The real-time multichannel data acquisition system has the advantages of simple hardware circuit, flexible software design and effect of high-speed high-accuracy real-time data acquisition and transmission; and is widely applied in the fields of network, communication, information domestic appliances and industrial automation.

Description

technical field [0001] The invention belongs to the technical field of industrial automation control, and in particular relates to a high-real-time, high-precision data acquisition and control system, which is mainly used for analog signal sampling in a servo control system. Background technique [0002] In the servo system that needs high-speed and high-precision data acquisition for multiple analog signals at the same time, high-speed data acquisition and real-time data transmission are important links in the servo control system. At present, the domestic servo control field often chooses multi-channel, 12-bit or higher resolution high-speed parallel interface A / D devices as the core device for data acquisition. The interface between A / D and the main control device mostly adopts direct interface mode, direct buffer mode and indirect buffer mode, etc. The above modes are difficult to meet the requirements of high-precision servo control system data collection. The main prob...

Claims

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Application Information

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IPC IPC(8): G05B19/048
Inventor 荆涛刘世挺
Owner 中国兵器工业第二〇六研究所
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