Abstract: Plastic flat film drawing machines process granular plastic raw materials into fine plastic filaments for weaving plastic woven bags through heating, extrusion, natural draping, stretching, cutting, and winding. The process has strict requirements on temperature and stretching speed. Advantech's ADAM remote module is a remote monitoring module based on RS-485 bus, featuring stable operation and long transmission distance. A remote monitoring system for plastic flat film drawing machines, implemented using remote module data detection and KingSCADA configuration software, effectively meets the requirements of various process indicators. Keywords: Advantech, ADAM, drawing machine, monitoring system 0 Introduction Tangshan Sanyou Alkali Industry Group Co., Ltd. is a large state-owned enterprise. Its subsidiary, Sanyou Plastic Woven Bag Factory, is a supporting enterprise specializing in the production of heavy alkali packaging woven bags for the company. The production of plastic woven bags mainly includes drawing, weaving, sewing, and printing. This project is a remote monitoring system for the main equipment in the drawing section—the plastic drawing machine. 1. Production Process of Plastic Fiber Drawing Machine and Its Control System Requirements The plastic fiber drawing machine feeds granular plastic raw materials into a heating device via a screw feeder driven by a main shaft motor. After melting, the liquid plastic naturally sags to form a plastic film. This film is then stretched and cut three times to produce uniformly thick plastic filaments for weaving plastic bags. Throughout the production process, the speed of the main shaft motor directly affects the feed rate and is a major factor influencing the final filament thickness. Secondly, the temperature of the main heating device is also a significant factor affecting the thickness of the naturally sag film. As the film thickness decreases, the speed of the four subsequent motors must be proportionally controlled to ensure consistent flow rates at all positions. The temperature of each tensioning device also affects product quality. The process flow of the plastic fiber drawing machine is shown in Figure 1. Based on the production process of the plastic filament drawing machine, the main monitoring contents of this system are determined to include: closed-loop speed regulation system of the 75KW AC asynchronous motor of the main shaft, closed-loop control of the raw material melting and heating temperature of the filament drawing machine, variable frequency speed regulation ratio control between the drive motors of each tensioning device of the filament drawing machine (4 AC asynchronous motors), temperature circulation detection and upper and lower limit alarms of each heating device of the filament drawing machine (4 points per device, 16 points in total), paperless recording of system parameters, display and printing of historical records, and extended functions such as recording and display of the working status of the plastic circular loom, and shutdown alarm. [align=center] Figure 1 Process flow diagram of plastic filament drawing machine[/align] 2 Hardware composition of the system 2.1 RS-485 bus technology The communication of this system is implemented using RS-485 bus. In data communication, computer networks and distributed control systems, serial communication is often used to realize information exchange. The electrical standard of RS-485 serial interface is actually a variant of RS-422, which belongs to the physical layer protocol standard of the OSI seven-layer model. Due to its excellent performance, simple structure, and easy networking, the RS-485 bus is increasingly widely used. The RS-485 bus allows multiple transmitters to connect to the same bus, increasing the transmitter's driving capability and conflict protection characteristics, and expanding the bus's common-mode range. It uses a balanced transmission method, requiring terminating resistors on the transmission lines. The RS-485 bus can only operate in half-duplex mode; to ensure communication reliability, a reasonable communication protocol must be developed based on communication requirements during communication system design. The RS-485 interface standard is mainly used for multi-station interconnection. Many instruments now have RS-485 communication interfaces. The technical specifications of the RS-485 protocol include: maximum transmission rate of 10Mbps; maximum distance of 1200M; differential (with compensation lines) transmission with high impedance noise; up to 32 nodes; bidirectional master-slave communication over a single twisted-pair cable; parallel node connection and multiplexing communication. 2.2 Advantech ADAM Modules Advantech is one of the leading manufacturers introducing PC technology to the automation market. In particular, Advantech's ADAM-4000 series remote DA&C system has been widely used in various industrial sites. The ADAM-4000 mainly includes communication modules and I/O modules. The communication module provides industrial Ethernet, fiber optic, serial, and wireless ports; the I/O module provides a complete signal conditioning and communication solution between the host and field signals. This system uses ADAM-4000 series digital I/O, analog I/O, dedicated RTD input modules, and dual-channel PID control modules to form a remote monitoring system. Its communication method uses RS-485 bus communication and utilizes an RS-485 to RS-232 bus conversion module to achieve communication with a PC. The main ADAM-4000 series modules selected for this system are shown in Table 1. Table 1 Main ADAM-4000 Modules 2.3 System Hardware Configuration The overall network structure of the system is shown in Figure 2. The system hardware wiring diagram (partial) is shown in Figure 3. [align=center] Figure 2 System Network Structure Diagram 3 System Partial Wiring Diagram[/align] 3 System Software Design This system uses KingSCADA 6.5 as the configuration software. The Advantech ADAM-4000 module is seamlessly integrated with KingSCADA, allowing for convenient configuration of the system hardware. 3.1 Hardware Configuration After the hardware wiring is completed, the Advantech ADAM-4000 series remote module driver (included with purchase) needs to be run on the host. Then, the various connected modules can be found in KingSCADA, and the access address and linked system variables of each module can be specified as required. 3.2 Software Configuration This system utilizes KingSCADA's modular design and its advantages of good flexibility, high stability, and ease of implementation for system software design. The following functions are mainly implemented through KingSCADA: main interface, motor speed proportional control interface, system historical reports and real-time reports, historical curves and real-time curves, alarm protection, etc. 1) Main interface and motor speed proportional control screen. The main interface completes the overall system monitoring, and various system functions can be realized through screen switching. 1) Motor speed proportional control screen: This screen can monitor various parameters of each motor, including speed, current, and voltage. 2) Real-time and historical curves: Real-time curves monitor the speed of the spindle motor and each tensioning motor, as well as the temperature of the main heater. Historical curves record the temperature values ​​at each temperature measurement point and the speed, voltage, and current of each motor. 3) System historical and real-time alarms: The system historical alarm window can record up to 100 historical alarm messages, including alarm time, date, alarm group, and alarm value. 4) System reports: System reports are divided into real-time and historical reports. Real-time reports record the temperature at specified temperature measurement points for various motor parameters. System historical reports record various historical data for the motor and historical data for each temperature measurement point, up to 9999 days of historical data, which can be printed if needed. 5) Control interface: The control interface allows for system startup and shutdown according to predefined working logic. When an alarm occurs, system parameters can be manually adjusted. In case of a serious fault, the system can be stopped urgently and reset safely. 3.3 Database Design Alarm and event information generated by KingSCADA can be recorded in an open database, such as Access or SQL Server, via ODBC. This design uses an Access database. Before using this function, relevant data tables and fields are first created in the database. Then, a data source (user DSN or system DSN) is configured in the system's ODBC data source. Username and password permissions can be defined for this data source. KingSCADA provides a control, KvDBGrid, to access large amounts of data in an open database via ODBC data source. This control allows setting different search conditions to access the database, perform data queries, and print the query results in a table format. 4 Conclusion This system effectively achieves real-time monitoring of plastic flat film drawing machines, enabling timely detection and protective measures in case of accidents. The system has completed all laboratory debugging and has undergone partial testing at the Tangshan Sanyou Alkali Industry Group Plastic Woven Bag Factory. Experimental results show that the system design is reasonable, the operation is stable and reliable, it can run for extended periods, the software is easy to operate, and it is easy to upgrade. The innovation of this paper lies in the fact that flat film drawing machines are commonly used equipment in plastic woven bag factories. Currently, their control systems generally adopt conventional instrument control. This paper utilizes Advantech's remote control module to realize remote monitoring of flat film drawing machines. The system uses Advantech's ADAM remote monitoring module and RS-485 bus for transmission, realizing a control scheme where the monitoring module is on-site and only transmits the monitored signals back to the control room. 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