1. PLC control program design
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The Siemens S7-315-2DP is used as the Profibus fieldbus master station to provide direct and convenient high-speed cyclic communication service with Rexroth position controller CLM. The communication speed is high, the control is timely, the anti-interference ability is strong and the programming is simple. Import the position controller CLM device database file (IN2_04eb.gsd) in the PLC programming software STEP7, complete the hardware network configuration, assign the network address to the position controller, the address must be the same as the one set in the controller parameters, in the organization block OB The SFC14 "DPRD_DAT" system function block is used to receive/send process data to the position controller.
Set the bus communication rate with the master station in the position controller parameter B007, set the slave network address in parameter B008, and select the parameter process data object (PPO) type, so that the system's field device and PLC pass the Profibus-DP bus. Data can be read and written and control data can be transferred, such as control words, status words, setpoints and actual values. In addition to the process data, Profibus-DP also transmits the parameterization and diagnostic signals of the drive system.
The PLC coordinates the belt and the tool holder according to the running speed of the linkage line, the operation command and the state of the cutting device. The storage amount of the tread between the two conveyor belts causes the sensor to generate a corresponding analog output signal, and combines with the speed of the preceding conveyor belt to determine the running speed of the cutting belt according to a certain algorithm, thereby changing the speed correspondingly by the PLC to transport With coordinated smooth operation. The user sets the tread cutting length and other parameters according to the production needs of the product, and completes the data transmission between the PLC and the position controller through the bus.
2. Servo program design of position controller CLM
Rexroth position controller CLM is a compact, modular two/four-axis CNC system that directly drives Rexroth DKC servo drive to complete the precise positioning operation of AC servo motor. Two sets of Rexroth DKC servo drive in this system complete the fixed length transmission of conveyor belt respectively. And the control of cutting the tool holder traverse. The position controller has a rich instruction set for writing control programs on its operator panel or on a computer with programming software (MotionManger).
The block diagram of the cutting servo control program is shown in Figure 3. The program is mainly composed of bus communication, conveyor belt control and cutting tool holder control. The control and status information transmission between the controller and the PLC is completed by the bus communication program, and the controller receives the control information transmitted by the PLC such as the speed value, the length value and the operation instruction, and transmits the operation status information to the PLC for analysis and display; The conveyor control program completes the speed and position control of the conveyor servo motor, precise length and smooth and fast operation of the tread cutting; the cutting tool holder control program completes the cutting movement of the cutting tool holder and the control of its auxiliary device to ensure the cutting action Normal execution, resulting in a better cutting end face.
Figure 3 servo control block diagram
3. Monitoring system design
The system takes PLC as the first main station and industrial PC as the second main station, in which the industrial PC acts as the upper computer, providing a good human-computer interaction environment, realizing the production management and monitoring of the entire production line, and achieving connection to the workshop level. INTRANET network. The first main station (master PLC) is the core of the entire tread production line control system, which realizes the collection and processing of production process data, as well as the communication of control signals and industrial PCs, so that operators can monitor the equipment on site. The operation, working status and measurement analysis results of the whole system are monitored and displayed on the industrial PC. The relevant data information is uploaded by the PLC through the field bus, the system alarm is processed, the historical data is stored, various reports are generated, and the graphic display and human-machine are performed. Dialogue, the relevant control commands are transmitted to the PLC, thereby realizing the information management between the monitoring computer and the field device.
The cutting control man-machine interface uses the TP270 touch screen and is connected to the PLC host via the Profibus bus. For the programming of the touch screen, the ProTool/ProCS configuration software provided by Siemens is used for programming configuration. ProTool/ ProCS's complete graphical user interface plus the software's own project configuration wizard allows users to easily create object-oriented, symbol-based projects. In the ProTool/ProCS interface, the operating unit and the actuator communicate via tags via the PLC, ie the memory address on the PLC that the HMI can read or write directly. The software design idea is to design a software system that allows the operator to self-learn the operating procedures based on the basic human-computer interaction function. Through the human-machine interface, the operator can set some basic parameters, such as fixed length value, error adjustment, number of cuttings, etc., can also monitor the alarm status of the system, learn the operating specifications of the system and password settings. When the automatic operation is controlled according to the action flow of the device design, some parameters that need to be adjusted, such as speed and position, can be easily adjusted and revised on the touch screen. Abnormal stop When the positioning module, servo drive, travel switch and machine abnormality, the servo motor should stop running immediately, and an abnormal code is displayed on the touch screen so that the maintenance personnel can keep abreast of the problem.
Third, the conclusion
The control system makes full use of advanced technologies such as PLC, Profibus fieldbus technology and servo control. The system adopts distributed open structure, fast response, flexible configuration, perfect control functions and simple operation. After the design of the fixed length cutting system has been put into use in a number of all-steel radial tire production lines, the control accuracy reaches ±1mm. It is proved that the control system based on Profibus-DP field bus is safe and reliable, and the failure rate is low. The high standard requirements of the road process have a high level of production and management automation, improve production efficiency and create better economic benefits.
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