Hollysys LK PLC applied in modified starch production line control

Hollysys LK PLC application in the modified starch production line control Beijing hollysys automation and drive technology company welcome to visit e roderick woo hall hall 9 grain and oil machinery exhibition hall of flour, cleaner, starch production line, machine, edible oil processing equipment,. 。 。 PLC application in the modified starch production line control, is a symbol of the growth of modified starch processing industry automation. Based on firm hollysys LK PLC control system to ensure stable, reliable and real-time operation of the production line. Through industrial Ethernet and upper HollyView unit configuration software for data exchange, fast dynamic response. 1 the introduction of PLC control system in recent years, more and more applied to the control of domestic modified starch production line, because the traditional modified starch production line completed by relay control system, the control of relay control system of the defect is large, complex control wiring, high failure rate, poor reliability and flexibility. In comparison of PLC control system has a design team and have better flexibility, accurate production data collection and control powerful management, the system runs stably high reliability, simple system maintenance, data communication exchange in time, the advantages of quick dynamic response. Practice proves that application of PLC control system to improve production safety and reliability, production efficiency, product quality has significant social benefits and economic benefits. 2 system design in this system using computer, PLC and intelligent instrument and electrical control cabinet control monitoring management system, through the PLC program instructions to control the electric equipment of single or interlocking operation, monitor the running status of electric equipment, intelligent instrument to collect field temperature and pressure data, such as the machine PLC and PC HollyView interaction, through the Ethernet data by PC HollyView real-time dynamic graphical display production process, in the production of important technical data, equipment running status, alarm fault information, and at the same time, the user can according to the actual situation in production by PC HollyView modify production process parameters to adjust production. To maximize the system meet the needs of the production. And through the industrial Ethernet and enterprise ERP for data exchange, is advantageous for the enterprise to manage the production line. Figure 1 production control system composed of three process control scheme s raw material conveying system production raw material conveying system is will produce the required raw materials to production line, including powder conveying and reagent control. S according to the powder conveying process automatic control in turn feed valve, discharge valve, inlet valve and emptying valve, through the scene of the pressure meter far eastone signal send powder to the specified power house. S according to liquid level meter liquid level signal automatic control in reagent storehouse reagent pump to transport to the designated agent. Figure 2 - 1 raw material conveying system of reagent s reagent configuration control system configuration control system is according to the production need to select the corresponding reagent, according to the set weight by type points successively weighing, speed control of each reagent produced liquid valve switch and the order of each reagent configuration of precision weighing. Send weighing good reagent to stir, to specify the configuration, according to the actual situation of powder with the reagent dosing pump dosing. S each reagent storehouse of liquid level signal detection, the weight of the reagent weighing warehouse signal, s reagent dosing pump flow can adjust weight value of each reagent configuration, value ahead of time, stirring time, make the reagent configuration to achieve the best accuracy. S according to the instantaneous flow rate of reagent dosing pump through the closed-loop control to adjust the dosing dosing pump frequency ratio, the amount of reagent adding 2 - best scale map 2 reagent composition control configuration system s powder powder configuration control system configuration control system is 6 powder line and its corresponding reagent line matching reaction to the production of packaging system, including temperature, pressure, air drying system controlled by PID, and manual setting function, control of production line equipment, to achieve a button in the upper machine automatic start-stop and interlock, ensure the normal operation of the production line. S testing various powder line of process parameters including temperature, pressure, etc. , each device of motor current, frequency, etc. S production line of the motor, to reverse interlock, from the expected incoming order, if you have any motor overload, the former machinery downtime to ensure that the powder will not block in the production line. S air drying system temperature, pressure, and PID control, through the set temperature, the pressure in the target with steam valve adjustment, comparing with actual measured value, the temperature, the pressure to achieve production line will allow. Figure 2 - Figure 2-3 PID control principle 4 powder composition control configuration system 4 application characteristics of the modified starch production line control system is the LK series PLC controller control unit and upper configuration software Hollyview monitoring control mode of operation, stable and reliable, powerful, has the following characteristics: s this system makes the production line fully automatic control, high degree of automation, ensure the safety of production, stable and reliable running. S implementation site, the control of two level control, greatly satisfy the use of customers' needs. S monitor screen to data, animation, real-time trend chart, historical trend curve display system equipment running status. S the system openness is strong, can through the OPC, DDE, ODBC and so on communication protocol and ERP software for data interaction, convenience for enterprise management. References [ 1] Lv Weiyang, chang-rong xu. PLC application engineering. China electric power press [ 2] Xiao-juan ma, lian-wei. Starch production technology. Shield press [ 3] Qiu Jun. Factory electrical control technology. China water conservancy and hydropower press [ 4] Zhi-feng wang. The industrial control configuration software. Electronic industry press.
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