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PLC data acquisition system

A data acquisition and data technology, applied in general control systems, control/regulation systems, comprehensive factory control, etc., can solve problems such as high equipment prices and unstable data collection

Inactive Publication Date: 2015-07-29
SHANGHAI LANBAO SENSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a PLC data acquisition system to solve the problems of unstable data acquisition and high equipment prices in the prior art

Method used

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  • PLC data acquisition system
  • PLC data acquisition system
  • PLC data acquisition system

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Embodiment Construction

[0016] Such as figure 1 Shown, a kind of PLC data acquisition system comprises PLC and host computer, also comprises data acquisition front-end machine, and this data acquisition front-end machine comprises data acquisition card and CPU card, and described data acquisition card has network interface, network control chip and MCU, the MCU has transplanted the LWIP protocol, the data acquisition card is directly connected to the PLC through a network interface, reads the data in the PLC, and communicates with the CPU card through the SPI bus, and the MCU regularly monitors Whether the network communication is normal, the host computer performs remote upgrade through the CPU card. The data acquisition card and the PLC are connected to a network switch through a network interface, and communicate with the PLC through a TCP / IP protocol. The data front-end processor and the host computer are connected to a network switch through a network interface, and communicate with each other ...

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Abstract

The invention discloses a PLC data acquisition system, which comprises a PLC, an upper computer, and a data acquisition front-end machine, wherein the data acquisition front-end machine comprises a data acquisition card and a CPU card; the data acquisition card is provided with a network interface, a network control chip and an MCU; the MCU migrates an LWIP protocol; the data acquisition card is directly connected with the PLC via the network interface for reading data in the PLC and communicates with the CPU card via an SPI bus; the MCU regularly monitors whether network communication is normal or not; the upper computer carries out remote upgrading via the CPU card; the data acquisition card and the PLC are connected with a network switch via the network interface and communicates with the PLC via a TCP / IP protocol; and the data front-end machine and the upper computer are connected with the network switch via the network interface and mutual communication is carried out via the TCP / IP protocol.

Description

technical field [0001] The invention belongs to the technical field of industrial control, in particular to a PLC data acquisition system. Background technique [0002] In the data acquisition system in the field of industrial control, PLC has been widely used equipment. However, many PLC communication protocols, such as the Siemens PLC communication protocol that is currently widely recognized by the industry, are not disclosed. To communicate with the PLC, you must install Siemens special boards such as CP5611, CP5613, etc. on the computer, or use Third-party development software KEPServerEx V4.0. These solutions all require an industrial computer and software to collect data. In practice, the existing technical solutions have the problems of high price, need of programming, complex operation and poor stability. Contents of the invention [0003] The purpose of the present invention is to provide a PLC data acquisition system to solve the problems of unstable data acq...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCY02P90/02G05B19/054G05B19/4185
Inventor 许永童谢勇许用疆
Owner SHANGHAI LANBAO SENSING TECH