Application of WinAC in automation system of thous

2022-06-17
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The application of WinAC in the automation system of thousand layer pastry production line

Abstract: WinAC is the latest industrial automation control system based on PC launched by Siemens. It has the characteristics of PC's powerful computing function, data processing ability, PLC logic measurement and control and operation reliability. This paper introduces the successful application of WinAC in the automatic production line of thousand layer pastry and its unique characteristics

key words: 1000 layer pastry oven based on PC automatic distributed control system process control system

overview

1000 layer pastry production line has a total length of about 200 meters, which is mainly composed of the following units:

1 laminated pastry machine

laminated pastry machine is the first important process for producing biscuits. Vertical or horizontal can be selected according to different plants. It includes seven rolls, three times of rolling, and is equipped with a pastry spreading machine. The automatic control system is required to meet the following requirements:

· the vector converter is used for transmission control to regulate the speed and ensure high stability of linear speed synchronization

· roll clearance is controlled by digital closed-loop adjustment system, which is simple, convenient, fast and efficient

· the man-machine interface control can realize linkage control with relevant parts of other forming hosts, and the operation is simple and convenient

· the stacking times and width can be adjusted arbitrarily within the range

· lamination width mm

· stacking times

· tablet thickness 0 Mm

2 feeder

the feeder will transport the mixed tough biscuit blank to the double rolling mill of the next process after preliminary rolling. The electric control system requires synchronous speed regulation control, manual adjustment and automatic operation control

3 double surface rolling mill

this equipment is used to roll the surface germ sent by the stacker or feeder for many times, so that the surface germ becomes thinner from thick. Requirements of the electric control system:

the roll adopts frequency conversion speed control, with synchronous speed and stable performance

accurately control the skin thickness, and use intelligent digital meter to set and display

4 oven

there are hot air circulation oven, far infrared oven, heat transfer oil oven, etc

biscuit baking oven is an important part of biscuit production line, which is composed of electrical control system, hot air circulation system, heating system, smoke exhaust system, furnace conveying device, furnace automatic detection and tensioning device, etc. the automatic control system is required to achieve the following functions:

real-time monitoring of the working state of the production line

temperature coordinates, temperature rise curve and other displays

temperature regulation system parameter correction

historical working status record preservation

high temperature control precision, convenient operation, stable operation, high efficiency and reliability

the hot air circulation system adopts automatic control of hot air volume, closed-loop control, and can select automatic functions such as natural and mandatory smoke exhaust

various safety protection functions such as under pressure, over pressure, gas leakage and over temperature of gas furnace

5 forming machine

the forming machine is composed of multiple surface mills and transmission units, and there is no mechanical transmission interlocking between them. The tension free detection unit requires the whole production line to run synchronously through the speed of the electrical control line, which is difficult to control and has high requirements for the functions of the automation system

II. Characteristics of control system

to sum up, the control system of Qianceng crisp production line is an integrated automatic control system integrating motion control and process control, which should be summarized as follows:

distributed: the total length of the production line is about 200 meters, and there are many and scattered control points, so the distributed measurement and control system is the most suitable. The distributed measurement and control system has the advantages of less wiring, strong interference ability, convenient expansion and maintenance, safe and reliable operation and minimum failure risk

bus: the whole line adopts field bus network control to eliminate the interference factors of a large number of analog signals, so as to achieve accurate speed coordination control and high-precision temperature measurement and control, which are consistent with the control

mass recipe storage: a production line can produce hundreds of products, so there are a large number of recipes stored and called. Ordinary PLC controller is difficult to store and call a large number of recipes due to the influence of memory, so PC based automation is the preferred scheme of the system

centralized management: distributed control and centralized management are the characteristics of modern process control system. The system is equipped with a perfect man-machine interface operating system and comprehensive system monitoring and abnormal alarm functions

motion control: speed synchronization is also the key of this control system. Vector converter is used to achieve the coordination and unification of the whole speed through master command control

III. PC based automation - winac

winac is the latest PC based automation control system launched by Siemens. WinAC has the function of PLC, but it is different from ordinary PLC controller. It has powerful calculation function, data processing ability and calculation speed unmatched by PLC, and takes into account the operation reliability of PLC. Its massive memory is especially suitable for large amount of data calculation, large amount of formula storage and management. Its calculation function is the same as that of PC, and its reliability and function can be compared with that of PLC-S system. It is the most ideal choice for the control system of thousand layer pastry molding machine and oven mechanical equipment:

progressiveness

winac is a PLC controller based on the standard Windows operating platform, with ladder diagram programming, so it has independent and strict timing control. It especially meets the control tasks of high-speed, accurate, complex calculation and strict time requirements

winac supports OPC, active X and DCOM technologies under standard Windows NT. The control and communication kernel shall deal with the problems in time once they are found; The communication of standard Windows NT tasks is completed by its built-in proxy server, so it has more powerful functions than ordinary PLC controllers

application development environment

siemens' unified configuration software step 7 is the standard development platform of WinAC controller, including communication configuration, programming, testing and startup, and the preparation of system files. Engineers familiar with STEP7 do not need to occupy additional training time

open interface

winac provides standard OPC control interface and active X control interface, which provides great convenience for our application

system configuration interface

opc process control ole is an international standard for automatically accessing data through Windows NT applications, and it is also a standard feature of WinAC. The OPC server can access the process data in the control driver; The active X control interface accesses process data directly from ole standard applications without programming. This function makes it possible for us to have a low threshold for more complex application development with the help of high-level language Visual Basic in software development

calculation function

winac provides powerful calculation function and establishes a working data link with industrial process data. It enables the upper computer to process process process data in real time, complete complex measurement control and fault analysis and calculation, and create its own HMI front end in visual basic or do statistical analysis in well-known excel. Manage the flow of data information between process control and PC applications, allowing efficient and easy access, display and modification of process data. For the process control system with large data processing capacity and high memory requirements, the general PLC controller is not competent for the work, which can be easily solved with WinAC. This is the reason why we choose WinAC, and Siemens provides us with a suitable and economical solution

IV. system principle and structure

the whole system forming machine has a total of 18 units. Each unit is equipped with a td-200 and cpu224 controller, which are used to measure and control the running speed and skin thickness of the machine, as well as to display and set parameters. Among them, the PLC of 9 mills also controls the skin thickness, realizing the closed-loop control of skin thickness. 18 PLCs and 18 frequency converters are distributed in the whole production line. All control equipment is equipped with -dp communication interface board. Through a highly reliable Profibus-DP Field Bus Group, a unified network structure, distributed control system and convenient local control and operation are realized

except that each unit can set parameters and monitor operation data independently, the control area of the molding machine is equipped with a touch-type human-computer interface, which is responsible for real-time monitoring of all equipment in the molding area through the PROFIBUS-DP network. A 15 inch screen computer is set in the oven area to conduct man-machine operation and monitoring, man-machine dialogue, data storage, report printing and production management on the equipment of the whole production line through PROFIBUS-DP

the main controller of the whole production line is the central controller WinAC, which is responsible for the main control of the production line, PROFIBUS-DP network management and network server. The software core and recipe database of the control system are completed by WinAC controller. In order to avoid the unpredictable impact of report printing and manual operation on the control system, the system adopts the hardware controller wbc416 developed on the basis of the software WinAC control system. In addition to preserving the advantages and characteristics of PC based automation, the system also has the characteristics of solid design, strong scalability, solid shell design, electronic hard disk and fan free structure. The overall structural design aims at the high protection level against vibration and impact. Integrated interfaces: USB, 10/100m Ethernet interface and profibus-dp/mpi industrial fieldbus system have cast the status of its main controller, and also ensured the high-grade and perfection of the system

dough thickness control system of dough mill

the measurement and control system of dough thickness consists of a closed-loop real-time monitoring system composed of grating sensor, PLC and stepping motor

the skin thickness is detected by ka-300 grating, and the detection accuracy is 0.02mm

the thickness feedback value is processed by PLC, then PID calculation is carried out and the stepping motor is controlled to form a closed-loop control system to eliminate the accumulated mechanical error

the closed-loop control system can correct the thickness in real time and improve the product quality

five phase stepping motor step angle 0.72o output frequency 9KHz,

v=1.95 a=0.75 n.m=0.45 (4.5 kg force)

oven temperature control system

oven temperature is divided into 8 zones. Each zone temperature is a closed-loop measurement and control system, equipped with intelligent algorithm, and the control accuracy can reach +1oc

special thermocouple module is used to collect temperature, and the surface temperature and bottom temperature are controlled respectively

control the SCR power regulator to control the temperature

scr power regulator's input signal is 0-10V, and its output power can be continuously adjusted. There are 8 three-phase balanced power regulators in total

the chimney in the temperature zone adjusts the opening according to the formula to control the flow

automatic detection and adjustment of steel strip slipping

intelligent closed-loop control algorithm, adaptive parameter setting function

the central control station can set and monitor the temperature

v. functions realized by the measurement and control system

Chinese dynamic man-machine operation interface, dynamic display of equipment operation status, real-time display of electrical parameters and process parameters, with the functions of real-time curve display, historical curve display, large-scale dynamic standard database, providing annual and monthly reports and random printing reports

the start/stop of field equipment can be monitored and controlled through the central monitoring station to intervene in the production process

pop up menu mode for parameter setting and change: including speed setting, temperature setting, thickness setting, order change, order parameter setting, and can be transmitted to the field controller PLC unit to change process parameters and control process

recipe parameter setting: hundreds of recipes can be set according to production needs, so that the first-line multi can become a reality

beautiful three-dimensional dynamic equipment graphics and process operation diagram interface

automatic operation, computer remote control operation

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