Development Of The Computer Auto Control System Of The Of Magnesium-smelting Forge

Manual control for the majority of magnesium furnace, the operation is easy mistakes,continuous monitoring and records in accordance with the magnesium production processrequirements, the development ofa PLC for the controlofthe coreproductioncomputer controlsystem, the use of DCS industrial control design concept. the distributed control system cancontrol and record the running state.The paper discusses the overall design of the system, MODBUS communication protocoldesign, analog acquisition and control program for multi-way solenoid valve.This thesiscontrolpanel wiring design, including a temperature control module, vacuum machine module,PLC variable process logic control programming of the device and the host computer programfor production of computer design.PLC as the control computer, collect data from intelligent temperature module, vacuumgauge. Due to the similarities and differences of these instrument communication interface, forsimple wiring and easy maintenance, its level converted to RS485level serial bus via theRS-485bus transfer to the PLC. It is automatic control of heating power of600kw high-powerDC power, multi-channel switch of the high temperature solenoid valve,50kw vacuummachine, and out of the feeding mechanism and other mechanical equipment. Production ofremote monitoring and controlcomputer via the RS232bus, set the operating parameters of theautomatic process programming and its optimization.Automatic controlprogram in accordance with the above, after the hardware and softwaredebugging, use the actual installation. The system has a continuous recording of variousprocess parameters and their variation, in process state curve drawn through the database. Thethesis automatically saved temperature, vacuum, voltage and current data, and laid thefoundation for the expert database. Remotely modify the PLC parameters can control theopening and closing of the valve to adjust the voltage scaling. A comparative analysis of independence from the PLC control or PLC and PC simultaneously two kinds of control, andprovides a basis for distributed control upgrade.