The 21st century is the century dominated by information, and “digital survival†has become a symbol of the knowledge economy. The mining informationization of developed mining countries has taken solid steps, such as the intelligent mining technology program announced by the Finnish mining industry in 1992, involving real-time process control of mining and dressing, real-time resource management, mine information network construction, new machinery applications and 28 topics such as automatic control. Most mining enterprises in China are still in a labor-intensive stage, and information transformation is imperative. It is a nobleman in the metal industry and is a leader in metals in terms of corrosion resistance, hardness and stretchability. Today's computer's precision components and key parts are all on the same side. It is also an important raw material in the "space era". It is inseparable in the fields of chemical engineering, machinery, precision instruments, electronics, electrical, superconducting, and national defense science and technology. Heat and corrosion resistant cockroaches. Jiangxi Yichun Yankuang Mine is the largest raw ore mine in the country. In recent years, it has upgraded its traditional production level with new technology, adjusted its product structure with technological advancement, updated the mining rig, shovel and transportation equipment, and introduced the beneficiation automation system to reduce Cost, improve product quality, broaden product market, and bring new vitality to the company. This paper studies the monitoring of the ore dressing network of Yichun Antimony Mine.
2. Bus control technologyThe fieldbus control system is a new type of control system based on fieldbus technology driven by the actual production demand driven by the maturity and development of control technology, computer technology, communication technology and network technology.
2.1 Fieldbus features
Fieldbus is also known as the underlying control network for open, digital, and multipoint communication. Since the 1990s, various fieldbus standards have been formed, including Lonworks, CAN, PROFIBUS, MODBUS, FF, HART and other protocol standards. Fieldbus technology is not only a communication technology, it actually incorporates the essence of technologies such as intelligent instrumentation, computer networks and Open Systems Interconnection (OSI). Has the following advantages unmatched by traditional equipment:
(1) The digital signal replaces the analog signal, which improves the anti-interference ability and adaptability to the field environment, improves the system detection accuracy, and shortens the control period.
(2) Realize intelligent and functional autonomy of field devices, so that basic process control, calculation, processing and other functions are dispersed into the field devices.
(3) The open bus system enables interconnection and information exchange between devices of different manufacturers, which improves the interoperability of the system.
(4) One-to-multipoint digital communication between connected devices and systems for information sharing.
(5) The system structure is highly dispersed, so that the danger of the system is dispersed. At the same time, the system structure is greatly simplified and the cost is reduced.
(6) Added non-control information, such as self-diagnosis, configuration and compensation information, to achieve the unification of on-site management and control.
(7) Only need to use a two-core communication cable to reduce a large number of signal cables, terminals, control cabinets and other installation accessories. Therefore, the difficulty and cost of installation and maintenance are greatly reduced.
2.2 MODBUS bus
MODBUS is an industrial communication and distributed control system protocol, introduced by MODICON Inc. of the United States. The MODBUS protocol defines a data frame structure that is independent of the physical layer medium and can be identified and used by all controllers, regardless of the type of network the device communicates, and thus has very good applicability.
The communication method of MODBUS is the master-slave mode. Both the request frame sent by the master and the response frame sent by the slave start with the slave address. The instruction sent to the user from the read-only side ignores the message starting with the other slave address and responds to the received correct message. This question-and-answer communication mode greatly improves the communication. The correct rate and make the MODBUS protocol relatively simple. The MODBUS protocol has also become a de facto universal standard, so most configuration monitoring software supports the MODNUS protocol for free. MODBUS has two transfer modes: RTU (Remote Terminal Unit) and ASCII. The RTU communication method adopted in this paper adopts the CRC-16 bit cyclic code redundancy check, that is, the entire string (excluding the last two bytes) is shifted in the specified manner and XOR is calculated. The calculation result has a string. Within the last two bytes, and the receiver performs the same calculation method to check whether they are consistent. This verification method has a good test effect on frame corruption caused by random or burst errors.
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