A plc on-site data acquisition and monitoring module and method based on opc protocol

Abstract

The invention discloses a universal configurable PLC data acquisition and monitoring module and method based on an OPC protocol. The PLC data acquisition and monitoring module comprises a PLC controland acquisition module, an OPC server module and an OPC client module; the PLC control and acquisition module comprises a PLC, a PLC program, an input and output module and a power module; the OPC server module is configured by professional OPC software, reads and writes PLC variables through the OPC protocol, and provides an OPC client with variable read and write services, including OPC software, OPC configuration files; and the OPC client module combines database technology and includes a user management module, a field data and status monitoring module, a system configuration module, and ahistorical data module. The universal configurable PLC data acquisition and monitoring module and method based on an OPC protocol combine the software and hardware technologies, realize the versatility, configurability and modularization of data collection and monitoring through the PLC, have strong scalability, are beneficial to the implementation of the field level management and monitoring systems such as MES and SFC, and achieve data traceability.

Description

technical field [0001] The invention relates to the field of data acquisition and monitoring, in particular to a general-purpose configurable PLC data acquisition and monitoring module and method based on the OPC protocol. Background technique [0002] With the in-depth development of technologies such as the Internet of Things, automation, and intelligence, intelligent manufacturing has become an important way for manufacturing companies to enhance their competitiveness. As the key unit of the intelligent manufacturing workshop, the implementation of workshop-level management and monitoring systems including MES and SFC is more imminent. As an important part and implementation basis, on-site data collection and monitoring are the key links to support the implementation of intelligent workshops. It is often an important part of the workshop-level control system. At present, the existing data collection and monitoring have the following problems and defects: [0003] (1) Ins...

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Problems solved by technology

[0003] (1) Insufficient adaptability to the diversity of PLC manufacturers

[0004] There are many existing mainstream PLC manufacturers, and each manufacturer has a variety of models, which also leads to a wide variety of PLCs and different communication protocols. Although the OPC protocol and a variety of OPC software have been widely used, but based on OPC technology The consistency of data collection and monitoring is still insufficient. When an enterprise implements a workshop management and control system, there are often multiple methods involved in PLC data collection and monitoring. Once the structure of the manufacturers that make up the workshop PLC changes, the entire system needs to be adjusted. , difficult to adapt to changes

[0005] (2) Data collection and monitoring lack independence and versatility

[0006] The existing data acquisition and monitoring is mainly a set of systems with enterprise or workshop specificity, or a part integrated in the workshop level management and control system, which leads to the need for special design and development for the data acquisition and monitoring part every time , once the system needs to be changed, the range of change will be large, which increases the cost of system implementation and is not conducive to system maintenance

[0007] To sum up, the existing technologies and methods can meet the data collection and monitoring needs of the workshop to a certain extent, but in terms of data collection and monitoring, the diversity of PLC and OPC software and the modularization and versatility of the dynamic changes in user needs , adaptability has not been fundamentally resolved

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