PLC and special function module in the application of the glass furnace control

1, summary of system stable operation of the parameters of glass furnace is very important, it directly affects the yield and quality of the glass. In glass production process on the stability of the furnace pressure and temperature have strict requirements, furnace pressure and temperature at the same time to write also involves other steps and parameters, such as fuel oil pressure and temperature, the pressure of atomizing medium, and the reversing process, and so on. If you want to achieve the stability of these parameters, and to better cooperate with different methods can be implemented. With the development of microelectronics technology, the PLC products in its function and performance index is greatly enrich and perfect, therefore, we have applied some special function module of PLC and some of the common I/O modules for various parameters for automatic control of glass furnace, including the parameters mentioned above, reversing control of furnace by PLC controller and frequency converter to realize control of the inverter output frequency of communication. Since the system put into use running in good condition. 2, system structure of this system, PC part chooses a on a machine with FIX software package, the PLC part selects famous brand of PLC, it has low cost, reliable operation, features strong characteristics. Actuators are mainly frequency converter, electromagnetic valve, film regulator, three-phase asynchronous motor, etc. System structure diagram as shown: 3, the function of PLC to realize this system can be roughly divided into three parts; 1, PID adjusting part 2, furnace commutation system, communication part of the 3, PLC and frequency converter. The PID part including oil pressure, oil temperature, oil flow ( 1 - No. 6) , atomization parameters such as medium, furnace pressure control. 3. Part 1 PlD to adjust PID control is mainly through the PID control unit, the unit is mainly has the following features; 1, l00ms high-speed sampling period, and realized high speed PID control. 2, digital filter attenuation input noise, the control input accidentally interference, make PID control effective quick response system. 3, multiple output specifications to choose from. 4, eight sets of data set, eight numerical ( Such as set point ( SP） And alarm Settings) Can be preset in the eight data sets. 5, can use the data to set the input and display the current values. 6, ahead of PID control, the use of the features of leading and automatic tuning of PID controller for the stability of PID control. 7, you can use PLC program and retrieve the input data. At the same time we through PLC program to realize the double PID control, so as to realize the stable operation of the kiln pressure and oil flow. PID control can be divided into two modes of local control and remote control, remote control is realized by PLC controlling, and two methods of manual and automatic, automatic controlled by PLC for automatic control, don't need human intervention. Manual control is given a valve position on the upper machine output value, through the PLC to control the valve position. Under normal circumstances is in remote control mode of automatic state, and each SV value of PID control loop, PV value, the OUT value can be displayed on the upper machine use stick figure, very intuitive. At the same time on the upper machine can easily modify the oil temperature, oil pressure, oil flow and pressure atomizing medium, the kiln of each control loop PID parameters, such as set value ( SV） , 'P' value, 'I', 'D' value, and the operating interface is friendly, easy to operate. 3. 2 furnace commutation part of the furnace of the reversing can be divided into manual, semi-automatic and automatic three ways, operation manual that is in the control on the ark; Semi-automatic and automatic controlled by PLC, under normal circumstances are under the reversing of fully automatic operation, do not need human intervention, as long as the upper machine set commutation time, PLC will be automatic reverse according to the given time. And PLC can automatically identify the direction, on the upper machine. Is to move at the same time also can guarantee automatic/semi-automatic/undisturbed switching between three states. 3. 3 communications PLC and frequency converter ( The fieldbus Device Net) Fieldbus is to enter the field of industrial field control in recent years, an advanced technology, we have adopted in this project Device Net open field bus to realize the communication between PLC and frequency converter. Device Net has many characteristics; 1, it is an open field bus network, in line with the Device Net fieldbus standards of domestic and foreign various manufacturers of machines can be connected. 2, it supports a wide range of data processing operations, from the usual ON/OFF data processing to the data of bar code reader.
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