Normal operation, reed wire suppliers not only can meet the on-site process requirements, but also improve equipment stability and production product quality and work efficiency. The speed measurement is inaccurate. They are widely used by the textile and light industries. In this example, the communication formats of COM2 and COM3 are: RS485, 19200, 7, E, 1. This solution uses COM2 port to connect to the inverter VFD002S21A,

and the human-machine interface directly reads the internal parameters of the inverter; using COM3 port to directly connect 6 DTC series thermostats, real-time Read the SV and PV values ​​of the corresponding slots and use PID temperature control to achieve accurate temperature control. COM1: RS232 communication mode is connected with the lower PLC to set and read the process parameters of the production line; COM2: RS485 communication mode is connected to an inverter, which can set the frequency given by the inverter, display the output frequency, output voltage,

and output current Parameters such as alarm information and approximate reason, and can start and stop the inverter through human-machine interface communication at the same time; COM3: RS485 communication mode is connected with 6 temperature controllers, which can display temperature set value, current value, and can also communicate through communication Set the communication station number and PID parameters of these 6 temperature controllers.1 Process flow Raw material A and raw material B are mixed in a certain proportion and then conveyed out. The production line system is mainly composed of batching tank A,

batching tank B, gear pump, gel tank, washing tank, wire drawing wheel, wire winding tank, wire winding wheel and other components, as shown in Figure 1. Utilizing the rich communication port functions of Delta's man-machine interface, it can provide users with 3 COM interfaces to facilitate communication and connection with peripheral industrial control equipment. If the U disk is not inserted on the back of the HMI, the alarm 'No storage disk found' will be displayed. M1013 is a 1S clock pulse, and M1012 is a 100ms clock pulse. The above program is an application example. Figure 2 Principle of control system 3.