There are different standards and methods for the classification of automation systems in metallurgical enterprises, but they can generally be divided into four or five levels, namely:
Bottom transmission level (level L0)
level 0, generally the transmission (motor control) and instrumentation are taken as level 0, that is, the transmission level; such as motor transmission control system, hydraulic and pneumatic transmission control system.
Basic automation level (L1 level):
The first level is the equipment control level of the unit, which generally refers to the first level of instrument control, programmable logic controller (PLC), etc., that is, logic control, through data acquisition, a remote control station (electric control cabinet) to realize instrumentation, driver, PLC, and other control equipment operation; it is the basic automation level;
Process control level (L2)
The second level is the part that focuses on the process control model of the unit, which is computer control, with certain control models and pictures, but this computer control is the control of a single process, such as the computer in the operating room of the converter, refining, and continuous casting Control; the core is the supporting mathematical model of production process control, which is the process control level. The second level receives the production line tracking signal and request from the first level, each block program module automatically calculates at a certain time, and throws out the production line rolling setting data; at the same time, it receives the actual rolling data thrown out by L1, and sends It is thrown to the three-level system; the network technology of the automation control system – Fieldbus technology, etc. are used.
Production control level (L3)
The third level is the comprehensive management of the whole factory, which mainly completes the management of the production plan of each unit in the whole factory, the tracking of the production contract, the management of the intermediate warehouse and the finished product warehouse, etc.; From delivery to delivery, a lot of data flow and management knowledge is involved. The third level is the computer control network of the entire factory, mainly for dispatching and issuing production plans, and the second level is to transmit production information data to the enterprise management level L4. The third level receives the production data of the entire factory and makes them into webpages for easy browsing, and is responsible for the setup and maintenance of all the networks of the whole company; ERP: the entire company’s logistics application statistics query, personnel attendance record query, etc. Company resource logistics personnel management system. After the realization of the ERP system, the logistics, capital flow, and information flow have been synchronized. The integration method of logistics-driven capital flow and supporting information flow embodies the concept of taking finance as the core; information flow is integrated according to rules, which provides a basis for enterprise optimization management; synchronous integration of logistics, capital flow, and information flow ensures the integration of enterprise resources, The movement of logistics forms the financial account content and the real data of the enterprise.
Enterprise management level (L4)
The fourth level, also known as the production management level, mainly completes the entire company’s contract management, financial management, production plan management, sales management, and finished product delivery tasks. Including order management, production planning management, procurement planning management, production and production management, material requirements planning management, procurement management, accounts payable management, warehouse management, material management, semi-finished product management, production process management, defective product management, outsourcing management, Until the final product is put into storage and the order is completed. Such as JIT, just-in-time production; FMS, flexible production; lean production (LP); agile manufacturing (AM), etc.
Some literature also mentions the e-commerce level (L5 level), which mainly uses various electronic tools to engage in business or activities
These tools include elementary telegraph, telephone, radio, television, fax to computer, computer network, modern systems such as NII (National Information Infrastructure – Information Superhighway), GII (Global Information Infrastructure), and the internet. Commercial activities are all activities after the typical production process is removed from the demand activities of pan-commodities (physical and non-physical, commodity and non-commoditized production factors, etc.) to the reasonable and legal consumption of pan-commodities. Five types of e-commerce models: B2B, B2C, C2C, B2M, and M2C.
To add: Regarding levels 1.5 and level 2.5, etc., level .5 is generally used for the control system of a single device, because the company wants to maintain the confidentiality of this part of the control system and will not open it to the current electrical integrator; for example, It is said that the entire production line is electrical from SIEMENS (including level 1 and level 2 systems), but the unique straightening machine is from SMSD. At this time, SMSD may embed its own straightening machine control system into the SIEMENS system, so there will be more Come out half a grade.
For example, a relatively complete hot-rolling computer system generally consists of four levels, namely:
(1) Basic automation level (L1 level), which mainly completes the sequence control, position control, speed control, quality control (thickness, width, temperature, plate shape) of the equipment, and the thermal parameter control of the heating furnace.
(2) Process control level (L2 level), which mainly implements the function of formulating and optimizing rolling procedures based on mathematical models, and completes setting and calculating process parameters.
(3) Production control level (L3 level), which mainly completes the adjustment and issuance of production plans, collects, processes, and uploads production performance to the production management level, and manages the three warehouses (slab warehouse, steel coil warehouse, and finished product warehouse), and perform tasks such as product quality monitoring.
(4) Production management level (level L4), which mainly completes contract management, financial management, production plan preparation, mutual coordination of each production line, application materials according to the contract, distribution of operation plans to level L3, collection of production performance of level L3, Track the production situation and quality situation, organize the delivery of finished products and other tasks.