[Abstract] : This article mainly discusses the practical application of CC-Link combined with a human-machine interface in the TFT manufacturing industry. It also compares CC-Link with previous single PLC circuits and traditional circuits, demonstrating its superiority in modern control. Keywords : TFT, PLC , CC-Link, human-machine interface, frequency converter. I. With the development of modern industry and the continuous improvement of automation, large and medium-sized control systems have gained great convenience, making control easier and operation simpler. In TFT manufacturing, some tasks must be performed by specific equipment, such as LCD cleaning. Previously, our LCD cleaning system used a single PLC and some switches for control, resulting in complex and unstable circuitry, prone to malfunctions, and inconvenient troubleshooting (due to the complexity of the circuitry and deficiencies in the alarm and monitoring system). Operation was also inconvenient, and functionality was incomplete, requiring manual intervention for many tasks, such as adjusting the sugar content, pH value, and pure water specific gravity of the cleaning agent, and discharging waste liquid. This not only resulted in low efficiency but also frequent errors. Later, we considered using CC-Link and a human-machine interface (HMI) to modify the system, simplifying control and circuitry, greatly enhancing operation, and improving overall system stability. A fault monitoring system was also added, allowing for timely detection of faults and facilitating system maintenance and repair. Furthermore, the use of CC-Link and the HMI enhances system scalability and facilitates distributed control, making it particularly suitable for LCD cleaning. The system mainly consists of four parts: a loading section, a main body section, an unloading section, and a waste liquid recovery section. The loading section mainly loads the product and transfers it to the main body of the equipment, where it is then cleaned and dried using ultrasonic waves and detergent. The main cleaning section is also divided into three parts: first, cleaning with detergent; then rinsing with pure water; and finally soaking in pure water. The liquid recovery section mainly recovers the waste cleaning liquid. This system is relatively decentralized. Using a single PLC would result in complex wiring and a cluttered control panel with numerous control switches. The current control panel is shown in Figure 1. The system's action sections mainly include the conveying section, shaking section, liquid circulation section, precision heating control section, thermal circulation control system, and waste liquid recovery system. The system uses a total of 27 motors, mostly controlled by FR-500 frequency converters. The system uses over 600 input/output points (including spare points). II. The entire system uses a Mitsubishi A-series PLC, a GOT human-machine interface, and 16 remote I/O modules. The system diagram is shown in the figure. [align=center]System Structure Diagram[/align] The above is the control diagram of the entire system. We used A1SJ61BT11 as the communication unit and CC-Link dedicated cable FANC-SBH to form a communication network. Termination resistors must be connected at both ends of the cable. We used SW1D5-CCMAP to directly generate the communication program. The program is relatively simple and can also be written manually. Using CC-Link connection, one CPU at the main station corresponds to a remote I/O unit, a remote node unit, and a local station unit. A maximum of 64 units can be connected. If all units in a system are connected to remote I/O units, 64 units and 2048 remote input/output points can be connected. If all units are remote node units, only 42 units can be connected. If all units are local stations or standby main stations, a maximum of 26 units can be connected. In addition to the devices mentioned above, the CC-Link system can connect to positioning units, RS232 Interface units, GPP functional peripheral device expansion units, FX series PLCs, T branch units, AC servos, as well as solenoid valves, sensors, indicators, temperature controllers, etc. III: Technical Performance and Features 1. To ensure the modified system can adapt to various operational and technical requirements, this aspect was considered during the design phase. For example, different products require different ultrasonic frequencies, varying shaking frequencies and amplitudes, and different cleaning times. These can be addressed by adjusting the inverter or system parameters to modify the system's operation. 2. The system utilizes CC-Link, simplifying wiring and facilitating maintenance and repair. 3. The system employs a human-machine interface, making the control panel very concise. A dedicated alarm monitoring system is included to promptly and clearly detect errors or malfunctions, allowing for rapid restoration of normal operation. 4. The internal components of the device consist entirely of corrosive liquid solvents and pure water, which are generally not suitable for direct human contact. Air valves control the entire system, and a leak monitoring system is installed to prevent leakage. 5. The pure water supply system operates on a unidirectional basis, not a circulating one, ensuring a consistently clean supply of pure water and guaranteeing the quality of product cleaning. 6. The system's heating system does not use direct heating, but rather a hot air circulation system, which effectively prevents localized overheating from causing product defects. 7. In addition, the system is also equipped with a liquid overall monitoring system, an overall device operation monitoring system, etc. IV: Scope of Application This system can adapt to the cleaning of any small-to-medium-sized products in the TFT manufacturing industry. For different products, different loading fixtures are used, and the entire device operates continuously and automatically. Therefore, the efficiency is relatively high and the output is relatively large. Moreover, this device can simultaneously clean two products using different cleaning agents. The system can automatically switch between products, without the need to stop the machine to change the cleaning agent. Figure 3 shows a physical photo of the entire device. In addition, the liquid recovery system is located outside the factory building. V: Experience In the design of the cleaning device, Mitsubishi industrial control products were basically used. This is mainly because Mitsubishi products have been used for a long time, and there is a high degree of reliance on them. Mitsubishi products themselves are also reliable and have strong functions. Through the use of CC-Link and the human-machine interface, the following points were drawn: 1. The CC-Link system is simple, applicable, reliable, and requires little investment. 2. The adoption of a human-machine interface makes the control panel very simple, and greatly increases the system's functionality. 3. The system wiring is simple, facilitating maintenance and repair. 4. CC-Link has strong scalability and good distribution capabilities. 5. The network transmission speed is fast; the fastest speed of a BUS network built using CC-Link can reach 10Mbps. 6. It can perform large-capacity data communication over long distances. 7. The CC-Link system has rich RAS functions, such as automatic reconnection, standby master station function, substation disconnection function, good link status confirmation function, and diagnostic functions. This makes the system more reliable. 8. N:N cyclic link transmission can be achieved between the master PC and local PCs. It is easy to build a distributed PC system. 9. The CC-Link system network is relatively open, and generally, domestic and foreign peripheral devices can be used. Other industrial control products are used in this system, and their operation is relatively reliable. Conclusion: This system adopts CC-Link and a human-machine interface. Overall, the functionality is greatly enhanced, while the system becomes very simple. In future applications, this system will be used as much as possible for medium to large-scale systems. References: 1. CC-Link User Manual (Japanese) Mitsubishi Electric Corporation, July 2000 2. Mitsubishi General Purpose PLC (Japanese) Mitsubishi Electric Corporation, July 2001 3. Mitsubishi Human-Machine Interface User Manual (Japanese) Mitsubishi Electric Corporation, 2000 4. TFT Cleaning Device Design Manual (Japanese) Satsuka Industrial Co., Ltd., June 2001